Release 4.17 mm/slub.c

// SPDX-License-Identifier: GPL-2.0
/*
 * SLUB: A slab allocator that limits cache line use instead of queuing
 * objects in per cpu and per node lists.
 *
 * The allocator synchronizes using per slab locks or atomic operatios
 * and only uses a centralized lock to manage a pool of partial slabs.
 *
 * (C) 2007 SGI, Christoph Lameter
 * (C) 2011 Linux Foundation, Christoph Lameter
 */

#include <linux/mm.h>
#include <linux/swap.h> /* struct reclaim_state */
#include <linux/module.h>
#include <linux/bit_spinlock.h>
#include <linux/interrupt.h>
#include <linux/bitops.h>
#include <linux/slab.h>
#include "slab.h"
#include <linux/proc_fs.h>
#include <linux/notifier.h>
#include <linux/seq_file.h>
#include <linux/kasan.h>
#include <linux/cpu.h>
#include <linux/cpuset.h>
#include <linux/mempolicy.h>
#include <linux/ctype.h>
#include <linux/debugobjects.h>
#include <linux/kallsyms.h>
#include <linux/memory.h>
#include <linux/math64.h>
#include <linux/fault-inject.h>
#include <linux/stacktrace.h>
#include <linux/prefetch.h>
#include <linux/memcontrol.h>
#include <linux/random.h>

#include <trace/events/kmem.h>

#include "internal.h"

/*
 * Lock order:
 *   1. slab_mutex (Global Mutex)
 *   2. node->list_lock
 *   3. slab_lock(page) (Only on some arches and for debugging)
 *
 *   slab_mutex
 *
 *   The role of the slab_mutex is to protect the list of all the slabs
 *   and to synchronize major metadata changes to slab cache structures.
 *
 *   The slab_lock is only used for debugging and on arches that do not
 *   have the ability to do a cmpxchg_double. It only protects the second
 *   double word in the page struct. Meaning
 *      A. page->freelist       -> List of object free in a page
 *      B. page->counters       -> Counters of objects
 *      C. page->frozen         -> frozen state
 *
 *   If a slab is frozen then it is exempt from list management. It is not
 *   on any list. The processor that froze the slab is the one who can
 *   perform list operations on the page. Other processors may put objects
 *   onto the freelist but the processor that froze the slab is the only
 *   one that can retrieve the objects from the page's freelist.
 *
 *   The list_lock protects the partial and full list on each node and
 *   the partial slab counter. If taken then no new slabs may be added or
 *   removed from the lists nor make the number of partial slabs be modified.
 *   (Note that the total number of slabs is an atomic value that may be
 *   modified without taking the list lock).
 *
 *   The list_lock is a centralized lock and thus we avoid taking it as
 *   much as possible. As long as SLUB does not have to handle partial
 *   slabs, operations can continue without any centralized lock. F.e.
 *   allocating a long series of objects that fill up slabs does not require
 *   the list lock.
 *   Interrupts are disabled during allocation and deallocation in order to
 *   make the slab allocator safe to use in the context of an irq. In addition
 *   interrupts are disabled to ensure that the processor does not change
 *   while handling per_cpu slabs, due to kernel preemption.
 *
 * SLUB assigns one slab for allocation to each processor.
 * Allocations only occur from these slabs called cpu slabs.
 *
 * Slabs with free elements are kept on a partial list and during regular
 * operations no list for full slabs is used. If an object in a full slab is
 * freed then the slab will show up again on the partial lists.
 * We track full slabs for debugging purposes though because otherwise we
 * cannot scan all objects.
 *
 * Slabs are freed when they become empty. Teardown and setup is
 * minimal so we rely on the page allocators per cpu caches for
 * fast frees and allocs.
 *
 * Overloading of page flags that are otherwise used for LRU management.
 *
 * PageActive           The slab is frozen and exempt from list processing.
 *                      This means that the slab is dedicated to a purpose
 *                      such as satisfying allocations for a specific
 *                      processor. Objects may be freed in the slab while
 *                      it is frozen but slab_free will then skip the usual
 *                      list operations. It is up to the processor holding
 *                      the slab to integrate the slab into the slab lists
 *                      when the slab is no longer needed.
 *
 *                      One use of this flag is to mark slabs that are
 *                      used for allocations. Then such a slab becomes a cpu
 *                      slab. The cpu slab may be equipped with an additional
 *                      freelist that allows lockless access to
 *                      free objects in addition to the regular freelist
 *                      that requires the slab lock.
 *
 * PageError            Slab requires special handling due to debug
 *                      options set. This moves slab handling out of
 *                      the fast path and disables lockless freelists.
 */



static inline int kmem_cache_debug(struct kmem_cache *s)
{
#ifdef CONFIG_SLUB_DEBUG
	return unlikely(s->flags & SLAB_DEBUG_FLAGS);
#else
	return 0;
#endif
}

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void *fixup_red_left(struct kmem_cache *s, void *p)
{
	if (kmem_cache_debug(s) && s->flags & SLAB_RED_ZONE)
		p += s->red_left_pad;

	return p;
}

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static inline bool kmem_cache_has_cpu_partial(struct kmem_cache *s)
{
#ifdef CONFIG_SLUB_CPU_PARTIAL
	return !kmem_cache_debug(s);
#else
	return false;
#endif
}

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/*
 * Issues still to be resolved:
 *
 * - Support PAGE_ALLOC_DEBUG. Should be easy to do.
 *
 * - Variable sizing of the per node arrays
 */

/* Enable to test recovery from slab corruption on boot */
#undef SLUB_RESILIENCY_TEST

/* Enable to log cmpxchg failures */
#undef SLUB_DEBUG_CMPXCHG

/*
 * Mininum number of partial slabs. These will be left on the partial
 * lists even if they are empty. kmem_cache_shrink may reclaim them.
 */

#define MIN_PARTIAL 5

/*
 * Maximum number of desirable partial slabs.
 * The existence of more partial slabs makes kmem_cache_shrink
 * sort the partial list by the number of objects in use.
 */

#define MAX_PARTIAL 10


#define DEBUG_DEFAULT_FLAGS (SLAB_CONSISTENCY_CHECKS | SLAB_RED_ZONE | \
                                SLAB_POISON | SLAB_STORE_USER)

/*
 * These debug flags cannot use CMPXCHG because there might be consistency
 * issues when checking or reading debug information
 */

#define SLAB_NO_CMPXCHG (SLAB_CONSISTENCY_CHECKS | SLAB_STORE_USER | \
                                SLAB_TRACE)


/*
 * Debugging flags that require metadata to be stored in the slab.  These get
 * disabled when slub_debug=O is used and a cache's min order increases with
 * metadata.
 */

#define DEBUG_METADATA_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER)


#define OO_SHIFT	16

#define OO_MASK		((1 << OO_SHIFT) - 1)

#define MAX_OBJS_PER_PAGE	32767 
/* since page.objects is u15 */

/* Internal SLUB flags */
/* Poison object */

#define __OBJECT_POISON		((slab_flags_t __force)0x80000000U)
/* Use cmpxchg_double */

#define __CMPXCHG_DOUBLE	((slab_flags_t __force)0x40000000U)

/*
 * Tracking user of a slab.
 */

#define TRACK_ADDRS_COUNT 16

struct track {
	
unsigned long addr;	/* Called from address */
#ifdef CONFIG_STACKTRACE
	
unsigned long addrs[TRACK_ADDRS_COUNT];	/* Called from address */
#endif
	
int cpu;		/* Was running on cpu */
	
int pid;		/* Pid context */
	
unsigned long when;	/* When did the operation occur */
};




enum track_item { TRACK_ALLOC, TRACK_FREE };

#ifdef CONFIG_SYSFS
static int sysfs_slab_add(struct kmem_cache *);
static int sysfs_slab_alias(struct kmem_cache *, const char *);
static void memcg_propagate_slab_attrs(struct kmem_cache *s);
static void sysfs_slab_remove(struct kmem_cache *s);
#else


static inline int sysfs_slab_add(struct kmem_cache *s) { return 0; }
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static inline int sysfs_slab_alias(struct kmem_cache *s, const char *p)
							{ return 0; }
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static inline void memcg_propagate_slab_attrs(struct kmem_cache *s) { }
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static inline void sysfs_slab_remove(struct kmem_cache *s) { }
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#endif



static inline void stat(const struct kmem_cache *s, enum stat_item si)
{
#ifdef CONFIG_SLUB_STATS
	/*
         * The rmw is racy on a preemptible kernel but this is acceptable, so
         * avoid this_cpu_add()'s irq-disable overhead.
         */
	raw_cpu_inc(s->cpu_slab->stat[si]);
#endif
}

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/********************************************************************
 *                      Core slab cache functions
 *******************************************************************/

/*
 * Returns freelist pointer (ptr). With hardening, this is obfuscated
 * with an XOR of the address where the pointer is held and a per-cache
 * random number.
 */


static inline void *freelist_ptr(const struct kmem_cache *s, void *ptr,
				 unsigned long ptr_addr)
{
#ifdef CONFIG_SLAB_FREELIST_HARDENED
	return (void *)((unsigned long)ptr ^ s->random ^ ptr_addr);
#else
	return ptr;
#endif
}

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/* Returns the freelist pointer recorded at location ptr_addr. */


static inline void *freelist_dereference(const struct kmem_cache *s,
					 void *ptr_addr)
{
	return freelist_ptr(s, (void *)*(unsigned long *)(ptr_addr),
			    (unsigned long)ptr_addr);
}

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static inline void *get_freepointer(struct kmem_cache *s, void *object)
{
	return freelist_dereference(s, object + s->offset);
}

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static void prefetch_freepointer(const struct kmem_cache *s, void *object)
{
	if (object)
		prefetch(freelist_dereference(s, object + s->offset));
}

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static inline void *get_freepointer_safe(struct kmem_cache *s, void *object)
{
	unsigned long freepointer_addr;
	void *p;

	if (!debug_pagealloc_enabled())
		return get_freepointer(s, object);

	freepointer_addr = (unsigned long)object + s->offset;
	probe_kernel_read(&p, (void **)freepointer_addr, sizeof(p));
	return freelist_ptr(s, p, freepointer_addr);
}

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Christoph Lameter
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static inline void set_freepointer(struct kmem_cache *s, void *object, void *fp)
{
	unsigned long freeptr_addr = (unsigned long)object + s->offset;

#ifdef CONFIG_SLAB_FREELIST_HARDENED
	BUG_ON(object == fp); /* naive detection of double free or corruption */
#endif

	*(void **)freeptr_addr = freelist_ptr(s, fp, freeptr_addr);
}

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/* Loop over all objects in a slab */

#define for_each_object(__p, __s, __addr, __objects) \
	for (__p = fixup_red_left(__s, __addr); \
                __p < (__addr) + (__objects) * (__s)->size; \
                __p += (__s)->size)


#define for_each_object_idx(__p, __idx, __s, __addr, __objects) \
	for (__p = fixup_red_left(__s, __addr), __idx = 1; \
                __idx <= __objects; \
                __p += (__s)->size, __idx++)

/* Determine object index from a given position */


static inline unsigned int slab_index(void *p, struct kmem_cache *s, void *addr)
{
	return (p - addr) / s->size;
}

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static inline unsigned int order_objects(unsigned int order, unsigned int size, unsigned int reserved)
{
	return (((unsigned int)PAGE_SIZE << order) - reserved) / size;
}

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static inline struct kmem_cache_order_objects oo_make(unsigned int order,
		unsigned int size, unsigned int reserved)
{
	struct kmem_cache_order_objects x = {
		(order << OO_SHIFT) + order_objects(order, size, reserved)
	};

	return x;
}

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Lai Jiangshan
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static inline unsigned int oo_order(struct kmem_cache_order_objects x)
{
	return x.x >> OO_SHIFT;
}

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static inline unsigned int oo_objects(struct kmem_cache_order_objects x)
{
	return x.x & OO_MASK;
}

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/*
 * Per slab locking using the pagelock
 */


static __always_inline void slab_lock(struct page *page)
{
	VM_BUG_ON_PAGE(PageTail(page), page);
	bit_spin_lock(PG_locked, &page->flags);
}

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static __always_inline void slab_unlock(struct page *page)
{
	VM_BUG_ON_PAGE(PageTail(page), page);
	__bit_spin_unlock(PG_locked, &page->flags);
}

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static inline void set_page_slub_counters(struct page *page, unsigned long counters_new)
{
	struct page tmp;
	tmp.counters = counters_new;
	/*
         * page->counters can cover frozen/inuse/objects as well
         * as page->_refcount.  If we assign to ->counters directly
         * we run the risk of losing updates to page->_refcount, so
         * be careful and only assign to the fields we need.
         */
	page->frozen  = tmp.frozen;
	page->inuse   = tmp.inuse;
	page->objects = tmp.objects;
}

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/* Interrupts must be disabled (for the fallback code to work right) */


static inline bool __cmpxchg_double_slab(struct kmem_cache *s, struct page *page,
		void *freelist_old, unsigned long counters_old,
		void *freelist_new, unsigned long counters_new,
		const char *n)
{
	VM_BUG_ON(!irqs_disabled());
#if defined(CONFIG_HAVE_CMPXCHG_DOUBLE) && \
    defined(CONFIG_HAVE_ALIGNED_STRUCT_PAGE)
	if (s->flags & __CMPXCHG_DOUBLE) {
		if (cmpxchg_double(&page->freelist, &page->counters,
				   freelist_old, counters_old,
				   freelist_new, counters_new))
			return true;
	} else
#endif
	{
		slab_lock(page);
		if (page->freelist == freelist_old &&
					page->counters == counters_old) {
			page->freelist = freelist_new;
			set_page_slub_counters(page, counters_new);
			slab_unlock(page);
			return true;
		}
		slab_unlock(page);
	}

	cpu_relax();
	stat(s, CMPXCHG_DOUBLE_FAIL);

#ifdef SLUB_DEBUG_CMPXCHG
	pr_info("%s %s: cmpxchg double redo ", n, s->name);
#endif

	return false;
}

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Christoph Lameter
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Heiko Carstens
12
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Jan Beulich
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2.87%
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Joe Perches
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Fabian Frederick
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static inline bool cmpxchg_double_slab(struct kmem_cache *s, struct page *page,
		void *freelist_old, unsigned long counters_old,
		void *freelist_new, unsigned long counters_new,
		const char *n)
{
#if defined(CONFIG_HAVE_CMPXCHG_DOUBLE) && \
    defined(CONFIG_HAVE_ALIGNED_STRUCT_PAGE)
	if (s->flags & __CMPXCHG_DOUBLE) {
		if (cmpxchg_double(&page->freelist, &page->counters,
				   freelist_old, counters_old,
				   freelist_new, counters_new))
			return true;
	} else
#endif
	{
		unsigned long flags;

		local_irq_save(flags);
		slab_lock(page);
		if (page->freelist == freelist_old &&
					page->counters == counters_old) {
			page->freelist = freelist_new;
			set_page_slub_counters(page, counters_new);
			slab_unlock(page);
			local_irq_restore(flags);
			return true;
		}
		slab_unlock(page);
		local_irq_restore(flags);
	}

	cpu_relax();
	stat(s, CMPXCHG_DOUBLE_FAIL);

#ifdef SLUB_DEBUG_CMPXCHG
	pr_info("%s %s: cmpxchg double redo ", n, s->name);
#endif

	return false;
}

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Christoph Lameter
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86.56%
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Heiko Carstens
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6.45%
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Jan Beulich
5
2.69%
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Dave Hansen
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Joe Perches
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Fabian Frederick
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#ifdef CONFIG_SLUB_DEBUG
/*
 * Determine a map of object in use on a page.
 *
 * Node listlock must be held to guarantee that the page does
 * not vanish from under us.
 */


static void get_map(struct kmem_cache *s, struct page *page, unsigned long *map)
{
	void *p;
	void *addr = page_address(page);

	for (p = page->freelist; p; p = get_freepointer(s, p))
		set_bit(slab_index(p, s, addr), map);
}

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Christoph Lameter
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Ben Greear
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8.96%
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Eduard - Gabriel Munteanu
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Akinobu Mita
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static inline unsigned int size_from_object(struct kmem_cache *s)
{
	if (s->flags & SLAB_RED_ZONE)
		return s->size - s->red_left_pad;

	return s->size;
}

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static inline void *restore_red_left(struct kmem_cache *s, void *p)
{
	if (s->flags & SLAB_RED_ZONE)
		p -= s->red_left_pad;

	return p;
}

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/*
 * Debug settings:
 */
#if defined(CONFIG_SLUB_DEBUG_ON)

static slab_flags_t slub_debug = DEBUG_DEFAULT_FLAGS;
#else

static slab_flags_t slub_debug;
#endif


static char *slub_debug_slabs;

static int disable_higher_order_debug;

/*
 * slub is about to manipulate internal object metadata.  This memory lies
 * outside the range of the allocated object, so accessing it would normally
 * be reported by kasan as a bounds error.  metadata_access_enable() is used
 * to tell kasan that these accesses are OK.
 */


static inline void metadata_access_enable(void)
{
	kasan_disable_current();
}

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static inline void metadata_access_disable(void)
{
	kasan_enable_current();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrey Ryabinin
12
100.00%
1
100.00%
Total
12
100.00%
1
100.00%

/*
 * Object debugging
 */

/* Verify that a pointer has an address that is valid within a slab page */


static inline int check_valid_pointer(struct kmem_cache *s,
				struct page *page, void *object)
{
	void *base;

	if (!object)
		return 1;

	base = page_address(page);
	object = restore_red_left(s, object);
	if (object < base || object >= base + page->objects * s->size ||
		(object - base) % s->size) {
		return 0;
	}

	return 1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
JoonSoo Kim
85
100.00%
1
100.00%
Total
85
100.00%
1
100.00%



static void print_section(char *level, char *text, u8 *addr,
			  unsigned int length)
{
	metadata_access_enable();
	print_hex_dump(level, text, DUMP_PREFIX_ADDRESS, 16, 1, addr,
			length, 1);
	metadata_access_disable();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
26
55.32%
2
33.33%
Sebastian Andrzej Siewior
7
14.89%
1
16.67%
Andrey Ryabinin
6
12.77%
1
16.67%
Daniel R Thompson
5
10.64%
1
16.67%
Ben Greear
3
6.38%
1
16.67%
Total
47
100.00%
6
100.00%



static struct track *get_track(struct kmem_cache *s, void *object,
	enum track_item alloc)
{
	struct track *p;

	if (s->offset)
		p = object + s->offset + sizeof(void *);
	else
		p = object + s->inuse;

	return p + alloc;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
60
100.00%
2
100.00%
Total
60
100.00%
2
100.00%



static void set_track(struct kmem_cache *s, void *object,
			enum track_item alloc, unsigned long addr)
{
	struct track *p = get_track(s, object, alloc);

	if (addr) {
#ifdef CONFIG_STACKTRACE
		struct stack_trace trace;
		int i;

		trace.nr_entries = 0;
		trace.max_entries = TRACK_ADDRS_COUNT;
		trace.entries = p->addrs;
		trace.skip = 3;
		metadata_access_enable();
		save_stack_trace(&trace);
		metadata_access_disable();

		/* See rant in lockdep.c */
		if (trace.nr_entries != 0 &&
		    trace.entries[trace.nr_entries - 1] == ULONG_MAX)
			trace.nr_entries--;

		for (i = trace.nr_entries; i < TRACK_ADDRS_COUNT; i++)
			p->addrs[i] = 0;
#endif
		p->addr = addr;
		p->cpu = smp_processor_id();
		p->pid = current->pid;
		p->when = jiffies;
	} else
		memset(p, 0, sizeof(struct track));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds
86
46.49%
1
14.29%
Christoph Lameter
86
46.49%
2
28.57%
Andrey Ryabinin
6
3.24%
1
14.29%
Akinobu Mita
4
2.16%
1
14.29%
Eduard - Gabriel Munteanu
2
1.08%
1
14.29%
Pekka J Enberg
1
0.54%
1
14.29%
Total
185
100.00%
7
100.00%



static void init_tracking(struct kmem_cache *s, void *object)
{
	if (!(s->flags & SLAB_STORE_USER))
		return;

	set_track(s, object, TRACK_FREE, 0UL);
	set_track(s, object, TRACK_ALLOC, 0UL);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
47
95.92%
2
66.67%
Eduard - Gabriel Munteanu
2
4.08%
1
33.33%
Total
49
100.00%
3
100.00%



static void print_track(const char *s, struct track *t, unsigned long pr_time)
{
	if (!t->addr)
		return;

	pr_err("INFO: %s in %pS age=%lu cpu=%u pid=%d\n",
	       s, (void *)t->addr, pr_time - t->when, t->cpu, t->pid);
#ifdef CONFIG_STACKTRACE
	{
		int i;
		for (i = 0; i < TRACK_ADDRS_COUNT; i++)
			if (t->addrs[i])
				pr_err("\t%pS\n", (void *)t->addrs[i]);
			else
				break;
	}
#endif
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
55
51.40%
1
16.67%
Linus Torvalds
41
38.32%
2
33.33%
Chintan Pandya
5
4.67%
1
16.67%
Eduard - Gabriel Munteanu
4
3.74%
1
16.67%
Fabian Frederick
2
1.87%
1
16.67%
Total
107
100.00%
6
100.00%



static void print_tracking(struct kmem_cache *s, void *object)
{
	unsigned long pr_time = jiffies;
	if (!(s->flags & SLAB_STORE_USER))
		return;

	print_track("Allocated", get_track(s, object, TRACK_ALLOC), pr_time);
	print_track("Freed", get_track(s, object, TRACK_FREE), pr_time);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
55
84.62%
3
75.00%
Chintan Pandya
10
15.38%
1
25.00%
Total
65
100.00%
4
100.00%



static void print_page_info(struct page *page)
{
	pr_err("INFO: Slab 0x%p objects=%u used=%u fp=0x%p flags=0x%04lx\n",
	       page, page->objects, page->inuse, page->freelist, page->flags);

}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
33
97.06%
3
75.00%
Fabian Frederick
1
2.94%
1
25.00%
Total
34
100.00%
4
100.00%



static void slab_bug(struct kmem_cache *s, char *fmt, ...)
{
	struct va_format vaf;
	va_list args;

	va_start(args, fmt);
	vaf.fmt = fmt;
	vaf.va = &args;
	pr_err("=============================================================================\n");
	pr_err("BUG %s (%s): %pV\n", s->name, print_tainted(), &vaf);
	pr_err("-----------------------------------------------------------------------------\n\n");

	add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE);
	va_end(args);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
45
55.56%
3
37.50%
Fabian Frederick
26
32.10%
2
25.00%
Dave Jones
8
9.88%
2
25.00%
Rusty Russell
2
2.47%
1
12.50%
Total
81
100.00%
8
100.00%



static void slab_fix(struct kmem_cache *s, char *fmt, ...)
{
	struct va_format vaf;
	va_list args;

	va_start(args, fmt);
	vaf.fmt = fmt;
	vaf.va = &args;
	pr_err("FIX %s: %pV\n", s->name, &vaf);
	va_end(args);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
39
63.93%
2
50.00%
Fabian Frederick
22
36.07%
2
50.00%
Total
61
100.00%
4
100.00%



static void print_trailer(struct kmem_cache *s, struct page *page, u8 *p)
{
	unsigned int off;	/* Offset of last byte */
	u8 *addr = page_address(page);

	print_tracking(s, p);

	print_page_info(page);

	pr_err("INFO: Object 0x%p @offset=%tu fp=0x%p\n\n",
	       p, p - addr, get_freepointer(s, p));

	if (s->flags & SLAB_RED_ZONE)
		print_section(KERN_ERR, "Redzone ", p - s->red_left_pad,
			      s->red_left_pad);
	else if (p > addr + 16)
		print_section(KERN_ERR, "Bytes b4 ", p - 16, 16);

	print_section(KERN_ERR, "Object ", p,
		      min_t(unsigned int, s->object_size, PAGE_SIZE));
	if (s->flags & SLAB_RED_ZONE)
		print_section(KERN_ERR, "Redzone ", p + s->object_size,
			s->inuse - s->object_size);

	if (s->offset)
		off = s->offset + sizeof(void *);
	else
		off = s->inuse;

	if (s->flags & SLAB_STORE_USER)
		off += 2 * sizeof(struct track);

	off += kasan_metadata_size(s);

	if (off != size_from_object(s))
		/* Beginning of the filler is the free pointer */
		print_section(KERN_ERR, "Padding ", p + off,
			      size_from_object(s) - off);

	dump_stack();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
183
76.57%
5
41.67%
JoonSoo Kim
30
12.55%
1
8.33%
Daniel R Thompson
10
4.18%
1
8.33%
Alexander Potapenko
7
2.93%
1
8.33%
Sebastian Andrzej Siewior
4
1.67%
1
8.33%
Pekka J Enberg
3
1.26%
1
8.33%
Fabian Frederick
1
0.42%
1
8.33%
Alexey Dobriyan
1
0.42%
1
8.33%
Total
239
100.00%
12
100.00%



void object_err(struct kmem_cache *s, struct page *page,
			u8 *object, char *reason)
{
	slab_bug(s, "%s", reason);
	print_trailer(s, page, object);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
41
100.00%
3
100.00%
Total
41
100.00%
3
100.00%



static void slab_err(struct kmem_cache *s, struct page *page,
			const char *fmt, ...)
{
	va_list args;
	char buf[100];

	va_start(args, fmt);
	vsnprintf(buf, sizeof(buf), fmt, args);
	va_end(args);
	slab_bug(s, "%s", buf);
	print_page_info(page);
	dump_stack();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
75
100.00%
4
100.00%
Total
75
100.00%
4
100.00%



static void init_object(struct kmem_cache *s, void *object, u8 val)
{
	u8 *p = object;

	if (s->flags & SLAB_RED_ZONE)
		memset(p - s->red_left_pad, val, s->red_left_pad);

	if (s->flags & __OBJECT_POISON) {
		memset(p, POISON_FREE, s->object_size - 1);
		p[s->object_size - 1] = POISON_END;
	}

	if (s->flags & SLAB_RED_ZONE)
		memset(p + s->object_size, val, s->inuse - s->object_size);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
85
78.70%
3
75.00%
JoonSoo Kim
23
21.30%
1
25.00%
Total
108
100.00%
4
100.00%



static void restore_bytes(struct kmem_cache *s, char *message, u8 data,
						void *from, void *to)
{
	slab_fix(s, "Restoring 0x%p-0x%p=0x%x\n", from, to - 1, data);
	memset(from, data, to - from);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
52
100.00%
2
100.00%
Total
52
100.00%
2
100.00%



static int check_bytes_and_report(struct kmem_cache *s, struct page *page,
			u8 *object, char *what,
			u8 *start, unsigned int value, unsigned int bytes)
{
	u8 *fault;
	u8 *end;

	metadata_access_enable();
	fault = memchr_inv(start, value, bytes);
	metadata_access_disable();
	if (!fault)
		return 1;

	end = start + bytes;
	while (end > fault && end[-1] == value)
		end--;

	slab_bug(s, "%s overwritten", what);
	pr_err("INFO: 0x%p-0x%p. First byte 0x%x instead of 0x%x\n",
					fault, end - 1, fault[0], value);
	print_trailer(s, page, object);

	restore_bytes(s, what, value, fault, end);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
136
94.44%
1
25.00%
Andrey Ryabinin
6
4.17%
1
25.00%
Fabian Frederick
1
0.69%
1
25.00%
Akinobu Mita
1
0.69%
1
25.00%
Total
144
100.00%
4
100.00%

/*
 * Object layout:
 *
 * object address
 *      Bytes of the object to be managed.
 *      If the freepointer may overlay the object then the free
 *      pointer is the first word of the object.
 *
 *      Poisoning uses 0x6b (POISON_FREE) and the last byte is
 *      0xa5 (POISON_END)
 *
 * object + s->object_size
 *      Padding to reach word boundary. This is also used for Redzoning.
 *      Padding is extended by another word if Redzoning is enabled and
 *      object_size == inuse.
 *
 *      We fill with 0xbb (RED_INACTIVE) for inactive objects and with
 *      0xcc (RED_ACTIVE) for objects in use.
 *
 * object + s->inuse
 *      Meta data starts here.
 *
 *      A. Free pointer (if we cannot overwrite object on free)
 *      B. Tracking data for SLAB_STORE_USER
 *      C. Padding to reach required alignment boundary or at mininum
 *              one word if debugging is on to be able to detect writes
 *              before the word boundary.
 *
 *      Padding is done using 0x5a (POISON_INUSE)
 *
 * object + s->size
 *      Nothing is used beyond s->size.
 *
 * If slabcaches are merged then the object_size and inuse boundaries are mostly
 * ignored. And therefore no slab options that rely on these boundaries
 * may be used with merged slabcaches.
 */



static int check_pad_bytes(struct kmem_cache *s, struct page *page, u8 *p)
{
	unsigned long off = s->inuse;	/* The end of info */

	if (s->offset)
		/* Freepointer is placed after the object. */
		off += sizeof(void *);

	if (s->flags & SLAB_STORE_USER)
		/* We also have user information there */
		off += 2 * sizeof(struct track);

	off += kasan_metadata_size(s);

	if (size_from_object(s) == off)
		return 1;

	return check_bytes_and_report(s, page, p, "Object padding",
			p + off, POISON_INUSE, size_from_object(s) - off);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
94
87.85%
2
50.00%
Alexander Potapenko
7
6.54%
1
25.00%
JoonSoo Kim
6
5.61%
1
25.00%
Total
107
100.00%
4
100.00%

/* Check the pad bytes at the end of a slab page */


static int slab_pad_check(struct kmem_cache *s, struct page *page)
{
	u8 *start;
	u8 *fault;
	u8 *end;
	u8 *pad;
	int length;
	int remainder;

	if (!(s->flags & SLAB_POISON))
		return 1;

	start = page_address(page);
	length = (PAGE_SIZE << compound_order(page)) - s->reserved;
	end = start + length;
	remainder = length % s->size;
	if (!remainder)
		return 1;

	pad = end - remainder;
	metadata_access_enable();
	fault = memchr_inv(pad, POISON_INUSE, remainder);
	metadata_access_disable();
	if (!fault)
		return 1;
	while (end > fault && end[-1] == POISON_INUSE)
		end--;

	slab_err(s, page, "Padding overwritten. 0x%p-0x%p", fault, end - 1);
	print_section(KERN_ERR, "Padding ", pad, remainder);

	restore_bytes(s, "slab padding", POISON_INUSE, fault, end);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
159
85.48%
6
50.00%
Balasubramani Vivekanandan
13
6.99%
1
8.33%
Andrey Ryabinin
6
3.23%
1
8.33%
Lai Jiangshan
4
2.15%
1
8.33%
Daniel R Thompson
2
1.08%
1
8.33%
Akinobu Mita
1
0.54%
1
8.33%
Sebastian Andrzej Siewior
1
0.54%
1
8.33%
Total
186
100.00%
12
100.00%



static int check_object(struct kmem_cache *s, struct page *page,
					void *object, u8 val)
{
	u8 *p = object;
	u8 *endobject = object + s->object_size;

	if (s->flags & SLAB_RED_ZONE) {
		if (!check_bytes_and_report(s, page, object, "Redzone",
			object - s->red_left_pad, val, s->red_left_pad))
			return 0;

		if (!check_bytes_and_report(s, page, object, "Redzone",
			endobject, val, s->inuse - s->object_size))
			return 0;
	} else {
		if ((s->flags & SLAB_POISON) && s->object_size < s->inuse) {
			check_bytes_and_report(s, page, p, "Alignment padding",
				endobject, POISON_INUSE,
				s->inuse - s->object_size);
		}
	}

	if (s->flags & SLAB_POISON) {
		if (val != SLUB_RED_ACTIVE && (s->flags & __OBJECT_POISON) &&
			(!check_bytes_and_report(s, page, p, "Poison", p,
					POISON_FREE, s->object_size - 1) ||
			 !check_bytes_and_report(s, page, p, "Poison",
				p + s->object_size - 1, POISON_END, 1)))
			return 0;
		/*
                 * check_pad_bytes cleans up on its own.
                 */
		check_pad_bytes(s, page, p);
	}

	if (!s->offset && val == SLUB_RED_ACTIVE)
		/*
                 * Object and freepointer overlap. Cannot check
                 * freepointer while object is allocated.
                 */
		return 1;

	/* Check free pointer validity */
	if (!check_valid_pointer(s, page, get_freepointer(s, p))) {
		object_err(s, page, p, "Freepointer corrupt");
		/*
                 * No choice but to zap it and thus lose the remainder
                 * of the free objects in this slab. May cause
                 * another error because the object count is now wrong.
                 */
		set_freepointer(s, p, NULL);
		return 0;
	}
	return 1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
268
89.33%
5
62.50%
JoonSoo Kim
29
9.67%
1
12.50%
Ingo Molnar
2
0.67%
1
12.50%
Nick Andrew
1
0.33%
1
12.50%
Total
300
100.00%
8
100.00%



static int check_slab(struct kmem_cache *s, struct page *page)
{
	int maxobj;

	VM_BUG_ON(!irqs_disabled());

	if (!PageSlab(page)) {
		slab_err(s, page, "Not a valid slab page");
		return 0;
	}

	maxobj = order_objects(compound_order(page), s->size, s->reserved);
	if (page->objects > maxobj) {
		slab_err(s, page, "objects %u > max %u",
			page->objects, maxobj);
		return 0;
	}
	if (page->inuse > page->objects) {
		slab_err(s, page, "inuse %u > max %u",
			page->inuse, page->objects);
		return 0;
	}
	/* Slab_pad_check fixes things up after itself */
	slab_pad_check(s, page);
	return 1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
129
94.16%
4
80.00%
Lai Jiangshan
8
5.84%
1
20.00%
Total
137
100.00%
5
100.00%

/*
 * Determine if a certain object on a page is on the freelist. Must hold the
 * slab lock to guarantee that the chains are in a consistent state.
 */


static int on_freelist(struct kmem_cache *s, struct page *page, void *search)
{
	int nr = 0;
	void *fp;
	void *object = NULL;
	int max_objects;

	fp = page->freelist;
	while (fp && nr <= page->objects) {
		if (fp == search)
			return 1;
		if (!check_valid_pointer(s, page, fp)) {
			if (object) {
				object_err(s, page, object,
					"Freechain corrupt");
				set_freepointer(s, object, NULL);
			} else {
				slab_err(s, page, "Freepointer corrupt");
				page->freelist = NULL;
				page->inuse = page->objects;
				slab_fix(s, "Freelist cleared");
				return 0;
			}
			break;
		}
		object = fp;
		fp = get_freepointer(s, object);
		nr++;
	}

	max_objects = order_objects(compound_order(page), s->size, s->reserved);
	if (max_objects > MAX_OBJS_PER_PAGE)
		max_objects = MAX_OBJS_PER_PAGE;

	if (page->objects != max_objects) {
		slab_err(s, page, "Wrong number of objects. Found %d but should be %d",
			 page->objects, max_objects);
		page->objects = max_objects;
		slab_fix(s, "Number of objects adjusted.");
	}
	if (page->inuse != page->objects - nr) {
		slab_err(s, page, "Wrong object count. Counter is %d but counted were %d",
			 page->inuse, page->objects - nr);
		page->inuse = page->objects - nr;
		slab_fix(s, "Object count adjusted.");
	}
	return search == NULL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
266
95.34%
7
63.64%
Lai Jiangshan
8
2.87%
1
9.09%
Cyrill V. Gorcunov
2
0.72%
1
9.09%
Joe Perches
2
0.72%
1
9.09%
Andrey Ryabinin
1
0.36%
1
9.09%
Total
279
100.00%
11
100.00%



static void trace(struct kmem_cache *s, struct page *page, void *object,
								int alloc)
{
	if (s->flags & SLAB_TRACE) {
		pr_info("TRACE %s %s 0x%p inuse=%d fp=0x%p\n",
			s->name,
			alloc ? "alloc" : "free",
			object, page->inuse,
			page->freelist);

		if (!alloc)
			print_section(KERN_INFO, "Object ", (void *)object,
					s->object_size);

		dump_stack();
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
79
95.18%
2
40.00%
Daniel R Thompson
2
2.41%
1
20.00%
Sebastian Andrzej Siewior
1
1.20%
1
20.00%
Fabian Frederick
1
1.20%
1
20.00%
Total
83
100.00%
5
100.00%

/*
 * Tracking of fully allocated slabs for debugging purposes.
 */


static void add_full(struct kmem_cache *s,
	struct kmem_cache_node *n, struct page *page)
{
	if (!(s->flags & SLAB_STORE_USER))
		return;

	lockdep_assert_held(&n->list_lock);
	list_add(&page->lru, &n->full);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
46
85.19%
3
75.00%
David Rientjes
8
14.81%
1
25.00%
Total
54
100.00%
4
100.00%



static void remove_full(struct kmem_cache *s, struct kmem_cache_node *n, struct page *page)
{
	if (!(s->flags & SLAB_STORE_USER))
		return;

	lockdep_assert_held(&n->list_lock);
	list_del(&page->lru);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
36
73.47%
1
33.33%
David Rientjes
8
16.33%
1
33.33%
Peter Zijlstra
5
10.20%
1
33.33%
Total
49
100.00%
3
100.00%

/* Tracking of the number of slabs for debugging purposes */


static inline unsigned long slabs_node(struct kmem_cache *s, int node)
{
	struct kmem_cache_node *n = get_node(s, node);

	return atomic_long_read(&n->nr_slabs);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
37
100.00%
1
100.00%
Total
37
100.00%
1
100.00%



static inline unsigned long node_nr_slabs(struct kmem_cache_node *n)
{
	return atomic_long_read(&n->nr_slabs);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Alexander Beregalov
22
100.00%
1
100.00%
Total
22
100.00%
1
100.00%



static inline void inc_slabs_node(struct kmem_cache *s, int node, int objects)
{
	struct kmem_cache_node *n = get_node(s, node);

	/*
         * May be called early in order to allocate a slab for the
         * kmem_cache_node structure. Solve the chicken-egg
         * dilemma by deferring the increment of the count during
         * bootstrap (see early_kmem_cache_node_alloc).
         */
	if (likely(n)) {
		atomic_long_inc(&n->nr_slabs);
		atomic_long_add(objects, &n->total_objects);
	}
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
55
94.83%
2
66.67%
JoonSoo Kim
3
5.17%
1
33.33%
Total
58
100.00%
3
100.00%



static inline void dec_slabs_node(struct kmem_cache *s, int node, int objects)
{
	struct kmem_cache_node *n = get_node(s, node);

	atomic_long_dec(&n->nr_slabs);
	atomic_long_sub(objects, &n->total_objects);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
48
100.00%
2
100.00%
Total
48
100.00%
2
100.00%

/* Object debug checks for alloc/free paths */


static void setup_object_debug(struct kmem_cache *s, struct page *page,
								void *object)
{
	if (!(s->flags & (SLAB_STORE_USER|SLAB_RED_ZONE|__OBJECT_POISON)))
		return;

	init_object(s, object, SLUB_RED_INACTIVE);
	init_tracking(s, object);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
54
100.00%
2
100.00%
Total
54
100.00%
2
100.00%



static inline int alloc_consistency_checks(struct kmem_cache *s,
					struct page *page,
					void *object, unsigned long addr)
{
	if (!check_slab(s, page))
		return 0;

	if (!check_valid_pointer(s, page, object)) {
		object_err(s, page, object, "Freelist Pointer check fails");
		return 0;
	}

	if (!check_object(s, page, object, SLUB_RED_INACTIVE))
		return 0;

	return 1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
69
80.23%
3
60.00%
Laura Abbott
15
17.44%
1
20.00%
Eduard - Gabriel Munteanu
2
2.33%
1
20.00%
Total
86
100.00%
5
100.00%



static noinline int alloc_debug_processing(struct kmem_cache *s,
					struct page *page,
					void *object, unsigned long addr)
{
	if (s->flags & SLAB_CONSISTENCY_CHECKS) {
		if (!alloc_consistency_checks(s, page, object, addr))
			goto bad;
	}

	/* Success perform special debug activities for allocs */
	if (s->flags & SLAB_STORE_USER)
		set_track(s, object, TRACK_ALLOC, addr);
	trace(s, page, object, 1);
	init_object(s, object, SLUB_RED_ACTIVE);
	return 1;

bad:
	if (PageSlab(page)) {
		/*
                 * If this is a slab page then lets do the best we can
                 * to avoid issues in the future. Marking all objects
                 * as used avoids touching the remaining objects.
                 */
		slab_fix(s, "Marking all objects used");
		page->inuse = page->objects;
		page->freelist = NULL;
	}
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
83
63.36%
7
87.50%
Laura Abbott
48
36.64%
1
12.50%
Total
131
100.00%
8
100.00%



static inline int free_consistency_checks(struct kmem_cache *s,
		struct page *page, void *object, unsigned long addr)
{
	if (!check_valid_pointer(s, page, object)) {
		slab_err(s, page, "Invalid object pointer 0x%p", object);
		return 0;
	}

	if (on_freelist(s, page, object)) {
		object_err(s, page, object, "Object already free");
		return 0;
	}

	if (!check_object(s, page, object, SLUB_RED_ACTIVE))
		return 0;

	if (unlikely(s != page->slab_cache)) {
		if (!PageSlab(page)) {
			slab_err(s, page, "Attempt to free object(0x%p) outside of slab",
				 object);
		} else if (!page->slab_cache) {
			pr_err("SLUB <none>: no slab for object 0x%p.\n",
			       object);
			dump_stack();
		} else
			object_err(s, page, object,
					"page slab pointer corrupt.");
		return 0;
	}
	return 1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
123
72.78%
4
40.00%
Laura Abbott
40
23.67%
2
20.00%
Ingo Molnar
2
1.18%
1
10.00%
Glauber de Oliveira Costa
2
1.18%
1
10.00%
Fabian Frederick
1
0.59%
1
10.00%
Joe Perches
1
0.59%
1
10.00%
Total
169
100.00%
10
100.00%

/* Supports checking bulk free of a constructed freelist */


static noinline int free_debug_processing(
	struct kmem_cache *s, struct page *page,
	void *head, void *tail, int bulk_cnt,
	unsigned long addr)
{
	struct kmem_cache_node *n = get_node(s, page_to_nid(page));
	void *object = head;
	int cnt = 0;
	unsigned long uninitialized_var(flags);
	int ret = 0;

	spin_lock_irqsave(&n->list_lock, flags);
	slab_lock(page);

	if (s->flags & SLAB_CONSISTENCY_CHECKS) {
		if (!check_slab(s, page))
			goto out;
	}

next_object:
	cnt++;

	if (s->flags & SLAB_CONSISTENCY_CHECKS) {
		if (!free_consistency_checks(s, page, object, addr))
			goto out;
	}

	if (s->flags & SLAB_STORE_USER)
		set_track(s, object, TRACK_FREE, addr);
	trace(s, page, object, 0);
	/* Freepointer not overwritten by init_object(), SLAB_POISON moved it */
	init_object(s, object, SLUB_RED_INACTIVE);

	/* Reached end of constructed freelist yet? */
	if (object != tail) {
		object = get_freepointer(s, object);
		goto next_object;
	}
	ret = 1;

out:
	if (cnt != bulk_cnt)
		slab_err(s, page, "Bulk freelist count(%d) invalid(%d)\n",
			 bulk_cnt, cnt);

	slab_unlock(page);
	spin_unlock_irqrestore(&n->list_lock, flags);
	if (!ret)
		slab_fix(s, "Object at 0x%p not freed", object);
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Laura Abbott
156
60.47%
3
25.00%
Christoph Lameter
61
23.64%
8
66.67%
Jesper Dangaard Brouer
41
15.89%
1
8.33%
Total
258
100.00%
12
100.00%



static int __init setup_slub_debug(char *str)
{
	slub_debug = DEBUG_DEFAULT_FLAGS;
	if (*str++ != '=' || !*str)
		/*
                 * No options specified. Switch on full debugging.
                 */
		goto out;

	if (*str == ',')
		/*
                 * No options but restriction on slabs. This means full
                 * debugging for slabs matching a pattern.
                 */
		goto check_slabs;

	slub_debug = 0;
	if (*str == '-')
		/*
                 * Switch off all debugging measures.
                 */
		goto out;

	/*
         * Determine which debug features should be switched on
         */
	for (; *str && *str != ','; str++) {
		switch (tolower(*str)) {
		case 'f':
			slub_debug |= SLAB_CONSISTENCY_CHECKS;
			break;
		case 'z':
			slub_debug |= SLAB_RED_ZONE;
			break;
		case 'p':
			slub_debug |= SLAB_POISON;
			break;
		case 'u':
			slub_debug |= SLAB_STORE_USER;
			break;
		case 't':
			slub_debug |= SLAB_TRACE;
			break;
		case 'a':
			slub_debug |= SLAB_FAILSLAB;
			break;
		case 'o':
			/*
                         * Avoid enabling debugging on caches if its minimum
                         * order would increase as a result.
                         */
			disable_higher_order_debug = 1;
			break;
		default:
			pr_err("slub_debug option '%c' unknown. skipped\n",
			       *str);
		}
	}

check_slabs:
	if (*str == ',')
		slub_debug_slabs = str + 1;
out:
	return 1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
149
87.65%
3
37.50%
Chris J Arges
9
5.29%
1
12.50%
Dmitriy Monakhov
8
4.71%
1
12.50%
Laura Abbott
2
1.18%
2
25.00%
Fabian Frederick
2
1.18%
1
12.50%
Total
170
100.00%
8
100.00%

__setup("slub_debug", setup_slub_debug);



slab_flags_t kmem_cache_flags(unsigned int object_size,
	slab_flags_t flags, const char *name,
	void (*ctor)(void *))
{
	/*
         * Enable debugging if selected on the kernel commandline.
         */
	if (slub_debug && (!slub_debug_slabs || (name &&
		!strncmp(slub_debug_slabs, name, strlen(slub_debug_slabs)))))
		flags |= slub_debug;

	return flags;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
57
93.44%
6
66.67%
Alexey Dobriyan
3
4.92%
2
22.22%
David Rientjes
1
1.64%
1
11.11%
Total
61
100.00%
9
100.00%

#else /* !CONFIG_SLUB_DEBUG */


static inline void setup_object_debug(struct kmem_cache *s,
			struct page *page, void *object) {}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
20
100.00%
2
100.00%
Total
20
100.00%
2
100.00%



static inline int alloc_debug_processing(struct kmem_cache *s,
	struct page *page, void *object, unsigned long addr) { return 0; }

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
26
92.86%
2
66.67%
Eduard - Gabriel Munteanu
2
7.14%
1
33.33%
Total
28
100.00%
3
100.00%



static inline int free_debug_processing(
	struct kmem_cache *s, struct page *page,
	void *head, void *tail, int bulk_cnt,
	unsigned long addr) { return 0; }

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
23
65.71%
2
40.00%
Jesper Dangaard Brouer
8
22.86%
1
20.00%
Laura Abbott
2
5.71%
1
20.00%
Eduard - Gabriel Munteanu
2
5.71%
1
20.00%
Total
35
100.00%
5
100.00%



static inline int slab_pad_check(struct kmem_cache *s, struct page *page)
			{ return 1; }
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
20
100.00%
1
100.00%
Total
20
100.00%
1
100.00%



static inline int check_object(struct kmem_cache *s, struct page *page,
			void *object, u8 val) { return 1; }
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
27
100.00%
2
100.00%
Total
27
100.00%
2
100.00%



static inline void add_full(struct kmem_cache *s, struct kmem_cache_node *n,
					struct page *page) {}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
21
100.00%
3
100.00%
Total
21
100.00%
3
100.00%



static inline void remove_full(struct kmem_cache *s, struct kmem_cache_node *n,
					struct page *page) {}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
16
76.19%
1
50.00%
Peter Zijlstra
5
23.81%
1
50.00%
Total
21
100.00%
2
100.00%



slab_flags_t kmem_cache_flags(unsigned int object_size,
	slab_flags_t flags, const char *name,
	void (*ctor)(void *))
{
	return flags;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
27
90.00%
4
66.67%
Alexey Dobriyan
3
10.00%
2
33.33%
Total
30
100.00%
6
100.00%


#define slub_debug 0


#define disable_higher_order_debug 0



static inline unsigned long slabs_node(struct kmem_cache *s, int node)
							{ return 0; }
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
19
100.00%
1
100.00%
Total
19
100.00%
1
100.00%



static inline unsigned long node_nr_slabs(struct kmem_cache_node *n)
							{ return 0; }
Contributors
Person
Tokens
Prop
Commits
CommitProp
Alexander Beregalov
16
100.00%
1
100.00%
Total
16
100.00%
1
100.00%



static inline void inc_slabs_node(struct kmem_cache *s, int node,
							int objects) {}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
17
100.00%
2
100.00%
Total
17
100.00%
2
100.00%



static inline void dec_slabs_node(struct kmem_cache *s, int node,
							int objects) {}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
17
100.00%
2
100.00%
Total
17
100.00%
2
100.00%

#endif /* CONFIG_SLUB_DEBUG */

/*
 * Hooks for other subsystems that check memory allocations. In a typical
 * production configuration these hooks all should produce no code at all.
 */


static inline void kmalloc_large_node_hook(void *ptr, size_t size, gfp_t flags)
{
	kmemleak_alloc(ptr, size, 1, flags);
	kasan_kmalloc_large(ptr, size, flags);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Roman Bobniev
28
75.68%
1
33.33%
Andrey Ryabinin
7
18.92%
1
33.33%
Alexander Potapenko
2
5.41%
1
33.33%
Total
37
100.00%
3
100.00%



static __always_inline void kfree_hook(void *x)
{
	kmemleak_free(x);
	kasan_kfree_large(x, _RET_IP_);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Roman Bobniev
15
65.22%
1
33.33%
Andrey Ryabinin
5
21.74%
1
33.33%
Dmitriy Vyukov
3
13.04%
1
33.33%
Total
23
100.00%
3
100.00%



static __always_inline bool slab_free_hook(struct kmem_cache *s, void *x)
{
	kmemleak_free_recursive(x, s->flags);

	/*
         * Trouble is that we may no longer disable interrupts in the fast path
         * So in order to make the debug calls that expect irqs to be
         * disabled we need to disable interrupts temporarily.
         */
#ifdef CONFIG_LOCKDEP
	{
		unsigned long flags;

		local_irq_save(flags);
		debug_check_no_locks_freed(x, s->object_size);
		local_irq_restore(flags);
	}
#endif
	if (!(s->flags & SLAB_DEBUG_OBJECTS))
		debug_check_no_obj_freed(x, s->object_size);

	/* KASAN might put x into memory quarantine, delaying its reuse */
	return kasan_slab_free(s, x, _RET_IP_);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrey Ryabinin
53
60.92%
2
22.22%
Christoph Lameter
14
16.09%
2
22.22%
Roman Bobniev
11
12.64%
1
11.11%
Andrey Konovalov
3
3.45%
1
11.11%
Dmitriy Vyukov
3
3.45%
1
11.11%
Alexander (Sasha) Levin
2
2.30%
1
11.11%
Alexander Potapenko
1
1.15%
1
11.11%
Total
87
100.00%
9
100.00%



static inline bool slab_free_freelist_hook(struct kmem_cache *s,
					   void **head, void **tail)
{
/*
 * Compiler cannot detect this function can be removed if slab_free_hook()
 * evaluates to nothing.  Thus, catch all relevant config debug options here.
 */
#if defined(CONFIG_LOCKDEP)	||		\
	defined(CONFIG_DEBUG_KMEMLEAK) ||	\
	defined(CONFIG_DEBUG_OBJECTS_FREE) ||	\
	defined(CONFIG_KASAN)

	void *object;
	void *next = *head;
	void *old_tail = *tail ? *tail : *head;

	/* Head and tail of the reconstructed freelist */
	*head = NULL;
	*tail = NULL;

	do {
		object = next;
		next = get_freepointer(s, object);
		/* If object's reuse doesn't have to be delayed */
		if (!slab_free_hook(s, object)) {
			/* Move object to the new freelist */
			set_freepointer(s, object, *head);
			*head = object;
			if (!*tail)
				*tail = object;
		}
	} while (object != old_tail);

	if (*head == *tail)
		*tail = NULL;

	return *head != NULL;
#else
	return true;
#endif
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrey Konovalov
94
54.97%
1
33.33%
Jesper Dangaard Brouer
76
44.44%
1
33.33%
Alexander Potapenko
1
0.58%
1
33.33%
Total
171
100.00%
3
100.00%



static void setup_object(struct kmem_cache *s, struct page *page,
				void *object)
{
	setup_object_debug(s, page, object);
	kasan_init_slab_obj(s, object);
	if (unlikely(s->ctor)) {
		kasan_unpoison_object_data(s, object);
		s->ctor(object);
		kasan_poison_object_data(s, object);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Thomas Gleixner
61
89.71%
1
50.00%
Andrey Ryabinin
7
10.29%
1
50.00%
Total
68
100.00%
2
100.00%

/*
 * Slab allocation and freeing
 */


static inline struct page *alloc_slab_page(struct kmem_cache *s,
		gfp_t flags, int node, struct kmem_cache_order_objects oo)
{
	struct page *page;
	unsigned int order = oo_order(oo);

	if (node == NUMA_NO_NODE)
		page = alloc_pages(flags, order);
	else
		page = __alloc_pages_node(node, flags, order);

	if (page && memcg_charge_slab(page, flags, order, s)) {
		__free_pages(page, order);
		page = NULL;
	}

	return page;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
48
50.00%
2
33.33%
Vladimir Davydov
46
47.92%
2
33.33%
Vlastimil Babka
1
1.04%
1
16.67%
Alexey Dobriyan
1
1.04%
1
16.67%
Total
96
100.00%
6
100.00%

#ifdef CONFIG_SLAB_FREELIST_RANDOM
/* Pre-initialize the random sequence cache */


static int init_cache_random_seq(struct kmem_cache *s)
{
	unsigned int count = oo_objects(s->oo);
	int err;

	/* Bailout if already initialised */
	if (s->random_seq)
		return 0;

	err = cache_random_seq_create(s, count, GFP_KERNEL);
	if (err) {
		pr_err("SLUB: Unable to initialize free list for %s\n",
			s->name);
		return err;
	}

	/* Transform to an offset on the set of pages */
	if (s->random_seq) {
		unsigned int i;

		for (i = 0; i < count; i++)
			s->random_seq[i] *= s->size;
	}
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Thomas Garnier
86
82.69%
1
33.33%
Sean Rees
10
9.62%
1
33.33%
Alexey Dobriyan
8
7.69%
1
33.33%
Total
104
100.00%
3
100.00%

/* Initialize each random sequence freelist per cache */


static void __init init_freelist_randomization(void)
{
	struct kmem_cache *s;

	mutex_lock(&slab_mutex);

	list_for_each_entry(s, &slab_caches, list)
		init_cache_random_seq(s);

	mutex_unlock(&slab_mutex);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Thomas Garnier
39
100.00%
1
100.00%
Total
39
100.00%
1
100.00%

/* Get the next entry on the pre-computed freelist randomized */


static void *next_freelist_entry(struct kmem_cache *s, struct page *page,
				unsigned long *pos, void *start,
				unsigned long page_limit,
				unsigned long freelist_count)
{
	unsigned int idx;

	/*
         * If the target page allocation failed, the number of objects on the
         * page might be smaller than the usual size defined by the cache.
         */
	do {
		idx = s->random_seq[*pos];
		*pos += 1;
		if (*pos >= freelist_count)
			*pos = 0;
	} while (unlikely(idx >= page_limit));

	return (char *)start + idx;
}

Contributors
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Thomas Garnier
88
100.00%
1
100.00%
Total
88
100.00%
1
100.00%

/* Shuffle the single linked freelist based on a random pre-computed sequence */


static bool shuffle_freelist(struct kmem_cache *s, struct page *page)
{
	void *start;
	void *cur;
	void *next;
	unsigned long idx, pos, page_limit, freelist_count;

	if (page->objects < 2 || !s->random_seq)
		return false;

	freelist_count = oo_objects(s->oo);
	pos = get_random_int() % freelist_count;

	page_limit = page->objects * s->size;
	start = fixup_red_left(s, page_address(page));

	/* First entry is used as the base of the freelist */
	cur = next_freelist_entry(s, page, &pos, start, page_limit,
				freelist_count);
	page->freelist = cur;

	for (idx = 1; idx < page->objects; idx++) {
		setup_object(s, page, cur);
		next = next_freelist_entry(s, page, &pos, start, page_limit,
			freelist_count);
		set_freepointer(s, cur, next);
		cur = next;
	}
	setup_object(s, page, cur);
	set_freepointer(s, cur, NULL);

	return true;
}
Contributors
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Thomas Garnier
195
100.00%
1
100.00%
Total
195
100.00%
1
100.00%

#else


static inline int init_cache_random_seq(struct kmem_cache *s)
{
	return 0;
}
Contributors
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Thomas Garnier
15
100.00%
1
100.00%
Total
15
100.00%
1
100.00%



static inline void init_freelist_randomization(void) { }
Contributors
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CommitProp
Thomas Garnier
8
100.00%
1
100.00%
Total
8
100.00%
1
100.00%



static inline bool shuffle_freelist(struct kmem_cache *s, struct page *page)
{
	return false;
}
Contributors
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CommitProp
Thomas Garnier
20
100.00%
1
100.00%
Total
20
100.00%
1
100.00%

#endif /* CONFIG_SLAB_FREELIST_RANDOM */



static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node)
{
	struct page *page;
	struct kmem_cache_order_objects oo = s->oo;
	gfp_t alloc_gfp;
	void *start, *p;
	int idx, order;
	bool shuffle;

	flags &= gfp_allowed_mask;

	if (gfpflags_allow_blocking(flags))
		local_irq_enable();

	flags |= s->allocflags;

	/*
         * Let the initial higher-order allocation fail under memory pressure
         * so we fall-back to the minimum order allocation.
         */
	alloc_gfp = (flags | __GFP_NOWARN | __GFP_NORETRY) & ~__GFP_NOFAIL;
	if ((alloc_gfp & __GFP_DIRECT_RECLAIM) && oo_order(oo) > oo_order(s->min))
		alloc_gfp = (alloc_gfp | __GFP_NOMEMALLOC) & ~(__GFP_RECLAIM|__GFP_NOFAIL);

	page = alloc_slab_page(s, alloc_gfp, node, oo);
	if (unlikely(!page)) {
		oo = s->min;
		alloc_gfp = flags;
		/*
                 * Allocation may have failed due to fragmentation.
                 * Try a lower order alloc if possible
                 */
		page = alloc_slab_page(s, alloc_gfp, node, oo);
		if (unlikely(!page))
			goto out;
		stat(s, ORDER_FALLBACK);
	}

	page->objects = oo_objects(oo);

	order = compound_order(page);
	page->slab_cache = s;
	__SetPageSlab(page);
	if (page_is_pfmemalloc(page))
		SetPageSlabPfmemalloc(page);

	start = page_address(page);

	if (unlikely(s->flags & SLAB_POISON))
		memset(start, POISON_INUSE, PAGE_SIZE << order);

	kasan_poison_slab(page);

	shuffle = shuffle_freelist(s, page);

	if (!shuffle) {
		for_each_object_idx(p, idx, s, start, page->objects) {
			setup_object(s, page, p);
			if (likely(idx < page->objects))
				set_freepointer(s, p, p + s->size);
			else
				set_freepointer(s, p, NULL);
		}
		page->freelist = fixup_red_left(s, start);
	}

	page->inuse = page->objects;
	page->frozen = 1;

out:
	if (gfpflags_allow_blocking(flags))
		local_irq_disable();
	if (!page)
		return NULL;

	mod_lruvec_page_state(page,
		(s->flags & SLAB_RECLAIM_ACCOUNT) ?
		NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE,
		1 << oo_order(oo));

	inc_slabs_node(s, page_to_nid(page), page->objects);

	return page;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
200
48.08%
12
40.00%
Thomas Gleixner
71
17.07%
1
3.33%
JoonSoo Kim
42
10.10%
4
13.33%
Mel Gorman
24
5.77%
4
13.33%
Wei Yang
22
5.29%
1
3.33%
Thomas Garnier
19
4.57%
1
3.33%
Pekka J Enberg
16
3.85%
1
3.33%
Glauber de Oliveira Costa
9
2.16%
2
6.67%
Andrey Ryabinin
5
1.20%
1
3.33%
Vladimir Davydov
4
0.96%
1
3.33%
Michal Hocko
3
0.72%
1
3.33%
Johannes Weiner
1
0.24%
1
3.33%
Total
416
100.00%
30
100.00%



static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node)
{
	if (unlikely(flags & GFP_SLAB_BUG_MASK)) {
		gfp_t invalid_mask = flags & GFP_SLAB_BUG_MASK;
		flags &= ~GFP_SLAB_BUG_MASK;
		pr_warn("Unexpected gfp: %#x (%pGg). Fixing up to gfp: %#x (%pGg). Fix your code!\n",
				invalid_mask, &invalid_mask, flags, &flags);
		dump_stack();
	}

	return allocate_slab(s,
		flags & (GFP_RECLAIM_MASK | GFP_CONSTRAINT_MASK), node);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Thomas Gleixner
51
67.11%
1
25.00%
Michal Hocko
22
28.95%
2
50.00%
Borislav Petkov
3
3.95%
1
25.00%
Total
76
100.00%
4
100.00%



static void __free_slab(struct kmem_cache *s, struct page *page)
{
	int order = compound_order(page);
	int pages = 1 << order;

	if (s->flags & SLAB_CONSISTENCY_CHECKS) {
		void *p;

		slab_pad_check(s, page);
		for_each_object(p, s, page_address(page),
						page->objects)
			check_object(s, page, p, SLUB_RED_INACTIVE);
	}

	mod_lruvec_page_state(page,
		(s->flags & SLAB_RECLAIM_ACCOUNT) ?
		NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE,
		-pages);

	__ClearPageSlabPfmemalloc(page);
	__ClearPageSlab(page);

	page_mapcount_reset(page);
	if (current->reclaim_state)
		current->reclaim_state->reclaimed_slab += pages;
	memcg_uncharge_slab(page, order, s);
	__free_pages(page, order);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
103
74.64%
8
57.14%
Nicholas Piggin
14
10.14%
1
7.14%
Vladimir Davydov
10
7.25%
1
7.14%
Mel Gorman
6
4.35%
2
14.29%
Laura Abbott
4
2.90%
1
7.14%
Johannes Weiner
1
0.72%
1
7.14%
Total
138
100.00%
14
100.00%


#define need_reserve_slab_rcu						\
	(sizeof(((struct page *)NULL)->lru) < sizeof(struct rcu_head))



static void rcu_free_slab(struct rcu_head *h)
{
	struct page *page;

	if (need_reserve_slab_rcu)
		page = virt_to_head_page(h);
	else
		page = container_of((struct list_head *)h, struct page, lru);

	__free_slab(page->slab_cache, page);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
41
75.93%
1
33.33%
Lai Jiangshan
12
22.22%
1
33.33%
Glauber de Oliveira Costa
1
1.85%
1
33.33%
Total
54
100.00%
3
100.00%



static void free_slab(struct kmem_cache *s, struct page *page)
{
	if (unlikely(s->flags & SLAB_TYPESAFE_BY_RCU)) {
		struct rcu_head *head;

		if (need_reserve_slab_rcu) {
			int order = compound_order(page);
			int offset = (PAGE_SIZE << order) - s->reserved;

			VM_BUG_ON(s->reserved != sizeof(*head));
			head = page_address(page) + offset;
		} else {
			head = &page->rcu_head;
		}

		call_rcu(head, rcu_free_slab);
	} else
		__free_slab(s, page);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Lai Jiangshan
53
49.07%
1
25.00%
Christoph Lameter
53
49.07%
1
25.00%
Paul E. McKenney
1
0.93%
1
25.00%
Kirill A. Shutemov
1
0.93%
1
25.00%
Total
108
100.00%
4
100.00%



static void discard_slab(struct kmem_cache *s, struct page *page)
{
	dec_slabs_node(s, page_to_nid(page), page->objects);
	free_slab(s, page);
}

Contributors
Person
Tokens
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Commits
CommitProp
Christoph Lameter
37
100.00%
3
100.00%
Total
37
100.00%
3
100.00%

/*
 * Management of partially allocated slabs.
 */

static inline void

__add_partial(struct kmem_cache_node *n, struct page *page, int tail)
{
	n->nr_partial++;
	if (tail == DEACTIVATE_TO_TAIL)
		list_add_tail(&page->lru, &n->partial);
	else
		list_add(&page->lru, &n->partial);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
55
94.83%
4
66.67%
David Shaohua Li
2
3.45%
1
16.67%
Steven Rostedt
1
1.72%
1
16.67%
Total
58
100.00%
6
100.00%



static inline void add_partial(struct kmem_cache_node *n,
				struct page *page, int tail)
{
	lockdep_assert_held(&n->list_lock);
	__add_partial(n, page, tail);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
15
40.54%
2
50.00%
Steven Rostedt
14
37.84%
1
25.00%
Peter Zijlstra
8
21.62%
1
25.00%
Total
37
100.00%
4
100.00%



static inline void remove_partial(struct kmem_cache_node *n,
					struct page *page)
{
	lockdep_assert_held(&n->list_lock);
	list_del(&page->lru);
	n->nr_partial--;
}

Contributors
Person
Tokens
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Commits
CommitProp
Steven Rostedt
29
76.32%
1
50.00%
Dmitry Safonov
9
23.68%
1
50.00%
Total
38
100.00%
2
100.00%

/*
 * Remove slab from the partial list, freeze it and
 * return the pointer to the freelist.
 *
 * Returns a list of objects or NULL if it fails.
 */


static inline void *acquire_slab(struct kmem_cache *s,
		struct kmem_cache_node *n, struct page *page,
		int mode, int *objects)
{
	void *freelist;
	unsigned long counters;
	struct page new;

	lockdep_assert_held(&n->list_lock);

	/*
         * Zap the freelist and set the frozen bit.
         * The old freelist is the list of objects for the
         * per cpu allocation list.
         */
	freelist = page->freelist;
	counters = page->counters;
	new.counters = counters;
	*objects = new.objects - new.inuse;
	if (mode) {
		new.inuse = page->objects;
		new.freelist = NULL;
	} else {
		new.freelist = freelist;
	}

	VM_BUG_ON(new.frozen);
	new.frozen = 1;

	if (!__cmpxchg_double_slab(s, page,
			freelist, counters,
			new.freelist, new.counters,
			"acquire_slab"))
		return NULL;

	remove_partial(n, page);
	WARN_ON(!freelist);
	return freelist;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
121
73.33%
13
76.47%
JoonSoo Kim
35
21.21%
2
11.76%
Peter Zijlstra
8
4.85%
1
5.88%
Dave Hansen
1
0.61%
1
5.88%
Total
165
100.00%
17
100.00%

static void put_cpu_partial(struct kmem_cache *s, struct page *page, int drain);
static inline bool pfmemalloc_match(struct page *page, gfp_t gfpflags);

/*
 * Try to allocate a partial slab from a specific node.
 */


static void *get_partial_node(struct kmem_cache *s, struct kmem_cache_node *n,
				struct kmem_cache_cpu *c, gfp_t flags)
{
	struct page *page, *page2;
	void *object = NULL;
	unsigned int available = 0;
	int objects;

	/*
         * Racy check. If we mistakenly see no partial slabs then we
         * just allocate an empty slab. If we mistakenly try to get a
         * partial slab and there is none available then get_partials()
         * will return NULL.
         */
	if (!n || !n->nr_partial)
		return NULL;

	spin_lock(&n->list_lock);
	list_for_each_entry_safe(page, page2, &n->partial, lru) {
		void *t;

		if (!pfmemalloc_match(page, flags))
			continue;

		t = acquire_slab(s, n, page, object == NULL, &objects);
		if (!t)
			break;

		available += objects;
		if (!object) {
			c->page = page;
			stat(s, ALLOC_FROM_PARTIAL);
			object = t;
		} else {
			put_cpu_partial(s, page, 0);
			stat(s, CPU_PARTIAL_NODE);
		}
		if (!kmem_cache_has_cpu_partial(s)
			|| available > slub_cpu_partial(s) / 2)
			break;

	}
	spin_unlock(&n->list_lock);
	return object;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
148
75.13%
8
53.33%
JoonSoo Kim
35
17.77%
3
20.00%
Alex Shi
10
5.08%
2
13.33%
Wei Yang
3
1.52%
1
6.67%
Alexey Dobriyan
1
0.51%
1
6.67%
Total
197
100.00%
15
100.00%

/*
 * Get a page from somewhere. Search in increasing NUMA distances.
 */


static void *get_any_partial(struct kmem_cache *s, gfp_t flags,
		struct kmem_cache_cpu *c)
{
#ifdef CONFIG_NUMA
	struct zonelist *zonelist;
	struct zoneref *z;
	struct zone *zone;
	enum zone_type high_zoneidx = gfp_zone(flags);
	void *object;
	unsigned int cpuset_mems_cookie;

	/*
         * The defrag ratio allows a configuration of the tradeoffs between
         * inter node defragmentation and node local allocations. A lower
         * defrag_ratio increases the tendency to do local allocations
         * instead of attempting to obtain partial slabs from other nodes.
         *
         * If the defrag_ratio is set to 0 then kmalloc() always
         * returns node local objects. If the ratio is higher then kmalloc()
         * may return off node objects because partial slabs are obtained
         * from other nodes and filled up.
         *
         * If /sys/kernel/slab/xx/remote_node_defrag_ratio is set to 100
         * (which makes defrag_ratio = 1000) then every (well almost)
         * allocation will first attempt to defrag slab caches on other nodes.
         * This means scanning over all nodes to look for partial slabs which
         * may be expensive if we do it every time we are trying to find a slab
         * with available objects.
         */
	if (!s->remote_node_defrag_ratio ||
			get_cycles() % 1024 > s->remote_node_defrag_ratio)
		return NULL;

	do {
		cpuset_mems_cookie = read_mems_allowed_begin();
		zonelist = node_zonelist(mempolicy_slab_node(), flags);
		for_each_zone_zonelist(zone, z, zonelist, high_zoneidx) {
			struct kmem_cache_node *n;

			n = get_node(s, zone_to_nid(zone));

			if (n && cpuset_zone_allowed(zone, flags) &&
					n->nr_partial > s->min_partial) {
				object = get_partial_node(s, n, c, flags);
				if (object) {
					/*
                                         * Don't check read_mems_allowed_retry()
                                         * here - if mems_allowed was updated in
                                         * parallel, that was a harmless race
                                         * between allocation and the cpuset
                                         * update
                                         */
					return object;
				}
			}
		}
	} while (read_mems_allowed_retry(cpuset_mems_cookie));
#endif
	return NULL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
118
65.92%
5
26.32%
Mel Gorman
47
26.26%
5
26.32%
Miao Xie
4
2.23%
1
5.26%
JoonSoo Kim
3
1.68%
2
10.53%
David Rientjes
2
1.12%
2
10.53%
Pekka J Enberg
2
1.12%
1
5.26%
Li Peng
1
0.56%
1
5.26%
Vladimir Davydov
1
0.56%
1
5.26%
Andi Kleen
1
0.56%
1
5.26%
Total
179
100.00%
19
100.00%

/*
 * Get a partial page, lock it and return it.
 */


static void *get_partial(struct kmem_cache *s, gfp_t flags, int node,
		struct kmem_cache_cpu *c)
{
	void *object;
	int searchnode = node;

	if (node == NUMA_NO_NODE)
		searchnode = numa_mem_id();
	else if (!node_present_pages(node))
		searchnode = node_to_mem_node(node);

	object = get_partial_node(s, get_node(s, searchnode), c, flags);
	if (object || node != NUMA_NO_NODE)
		return object;

	return get_any_partial(s, flags, c);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
72
73.47%
7
70.00%
JoonSoo Kim
26
26.53%
3
30.00%
Total
98
100.00%
10
100.00%

#ifdef CONFIG_PREEMPT
/*
 * Calculate the next globally unique transaction for disambiguiation
 * during cmpxchg. The transactions start with the cpu number and are then
 * incremented by CONFIG_NR_CPUS.
 */

#define TID_STEP  roundup_pow_of_two(CONFIG_NR_CPUS)
#else
/*
 * No preemption supported therefore also no need to check for
 * different cpus.
 */

#define TID_STEP 1
#endif



static inline unsigned long next_tid(unsigned long tid)
{
	return tid + TID_STEP;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
17
100.00%
2
100.00%
Total
17
100.00%
2
100.00%



static inline unsigned int tid_to_cpu(unsigned long tid)
{
	return tid % TID_STEP;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
17
100.00%
2
100.00%
Total
17
100.00%
2
100.00%



static inline unsigned long tid_to_event(unsigned long tid)
{
	return tid / TID_STEP;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
17
100.00%
2
100.00%
Total
17
100.00%
2
100.00%



static inline unsigned int init_tid(int cpu)
{
	return cpu;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
12
85.71%
2
66.67%
Namhyung Kim
2
14.29%
1
33.33%
Total
14
100.00%
3
100.00%



static inline void note_cmpxchg_failure(const char *n,
		const struct kmem_cache *s, unsigned long tid)
{
#ifdef SLUB_DEBUG_CMPXCHG
	unsigned long actual_tid = __this_cpu_read(s->cpu_slab->tid);

	pr_info("%s %s: cmpxchg redo ", n, s->name);

#ifdef CONFIG_PREEMPT
	if (tid_to_cpu(tid) != tid_to_cpu(actual_tid))
		pr_warn("due to cpu change %d -> %d\n",
			tid_to_cpu(tid), tid_to_cpu(actual_tid));
	else
#endif
	if (tid_to_event(tid) != tid_to_event(actual_tid))
		pr_warn("due to cpu running other code. Event %ld->%ld\n",
			tid_to_event(tid), tid_to_event(actual_tid));
	else
		pr_warn("for unknown reason: actual=%lx was=%lx target=%lx\n",
			actual_tid, tid, next_tid(tid));
#endif
	stat(s, CMPXCHG_DOUBLE_CPU_FAIL);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
128
96.24%
10
83.33%
Fabian Frederick
4
3.01%
1
8.33%
Namhyung Kim
1
0.75%
1
8.33%
Total
133
100.00%
12
100.00%



static void init_kmem_cache_cpus(struct kmem_cache *s)
{
	int cpu;

	for_each_possible_cpu(cpu)
		per_cpu_ptr(s->cpu_slab, cpu)->tid = init_tid(cpu);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
33
97.06%
3
75.00%
Fengguang Wu
1
2.94%
1
25.00%
Total
34
100.00%
4
100.00%

/*
 * Remove the cpu slab
 */


static void deactivate_slab(struct kmem_cache *s, struct page *page,
				void *freelist, struct kmem_cache_cpu *c)
{
	




enum slab_modes { M_NONE, M_PARTIAL, M_FULL, M_FREE };
	struct kmem_cache_node *n = get_node(s, page_to_nid(page));
	int lock = 0;
	enum slab_modes l = M_NONE, m = M_NONE;
	void *nextfree;
	int tail = DEACTIVATE_TO_HEAD;
	struct page new;
	struct page old;

	if (page->freelist) {
		stat(s, DEACTIVATE_REMOTE_FREES);
		tail = DEACTIVATE_TO_TAIL;
	}

	/*
         * Stage one: Free all available per cpu objects back
         * to the page freelist while it is still frozen. Leave the
         * last one.
         *
         * There is no need to take the list->lock because the page
         * is still frozen.
         */
	while (freelist && (nextfree = get_freepointer(s, freelist))) {
		void *prior;
		unsigned long counters;

		do {
			prior = page->freelist;
			counters = page->counters;
			set_freepointer(s, freelist, prior);
			new.counters = counters;
			new.inuse--;
			VM_BUG_ON(!new.frozen);

		} while (!__cmpxchg_double_slab(s, page,
			prior, counters,
			freelist, new.counters,
			"drain percpu freelist"));

		freelist = nextfree;
	}

	/*
         * Stage two: Ensure that the page is unfrozen while the
         * list presence reflects the actual number of objects
         * during unfreeze.
         *
         * We setup the list membership and then perform a cmpxchg
         * with the count. If there is a mismatch then the page
         * is not unfrozen but the page is on the wrong list.
         *
         * Then we restart the process which may have to remove
         * the page from the list that we just put it on again
         * because the number of objects in the slab may have
         * changed.
         */
redo:

	old.freelist = page->freelist;
	old.counters = page->counters;
	VM_BUG_ON(!old.frozen);

	/* Determine target state of the slab */
	new.counters = old.counters;
	if (freelist) {
		new.inuse--;
		set_freepointer(s, freelist, old.freelist);
		new.freelist = freelist;
	} else
		new.freelist = old.freelist;

	new.frozen = 0;

	if (!new.inuse && n->nr_partial >= s->min_partial)
		m = M_FREE;
	else if (new.freelist) {
		m = M_PARTIAL;
		if (!lock) {
			lock = 1;
			/*
                         * Taking the spinlock removes the possiblity
                         * that acquire_slab() will see a slab page that
                         * is frozen
                         */
			spin_lock(&n->list_lock);
		}
	} else {
		m = M_FULL;
		if (kmem_cache_debug(s) && !lock) {
			lock = 1;
			/*
                         * This also ensures that the scanning of full
                         * slabs from diagnostic functions will not see
                         * any frozen slabs.
                         */
			spin_lock(&n->list_lock);
		}
	}

	if (l != m) {

		if (l == M_PARTIAL)

			remove_partial(n, page);

		else if (l == M_FULL)

			remove_full(s, n, page);

		if (m == M_PARTIAL) {

			add_partial(n, page, tail);
			stat(s, tail);

		} else if (m == M_FULL) {

			stat(s, DEACTIVATE_FULL);
			add_full(s, n, page);

		}
	}

	l = m;
	if (!__cmpxchg_double_slab(s, page,
				old.freelist, old.counters,
				new.freelist, new.counters,
				"unfreezing slab"))
		goto redo;

	if (lock)
		spin_unlock(&n->list_lock);

	if (m == M_FREE) {
		stat(s, DEACTIVATE_EMPTY);
		discard_slab(s, page);
		stat(s, FREE_SLAB);
	}

	c->page = NULL;
	c->freelist = NULL;
}

Contributors
Person
Tokens
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Commits
CommitProp
Christoph Lameter
512
95.52%
10
66.67%
Wei Yang
17
3.17%
1
6.67%
Dave Hansen
2
0.37%
1
6.67%
David Shaohua Li
2
0.37%
1
6.67%
Peter Zijlstra
2
0.37%
1
6.67%
JoonSoo Kim
1
0.19%
1
6.67%
Total
536
100.00%
15
100.00%

/*
 * Unfreeze all the cpu partial slabs.
 *
 * This function must be called with interrupts disabled
 * for the cpu using c (or some other guarantee must be there
 * to guarantee no concurrent accesses).
 */


static void unfreeze_partials(struct kmem_cache *s,
		struct kmem_cache_cpu *c)
{
#ifdef CONFIG_SLUB_CPU_PARTIAL
	struct kmem_cache_node *n = NULL, *n2 = NULL;
	struct page *page, *discard_page = NULL;

	while ((page = c->partial)) {
		struct page new;
		struct page old;

		c->partial = page->next;

		n2 = get_node(s, page_to_nid(page));
		if (n != n2) {
			if (n)
				spin_unlock(&n->list_lock);

			n = n2;
			spin_lock(&n->list_lock);
		}

		do {

			old.freelist = page->freelist;
			old.counters = page->counters;
			VM_BUG_ON(!old.frozen);

			new.counters = old.counters;
			new.freelist = old.freelist;

			new.frozen = 0;

		} while (!__cmpxchg_double_slab(s, page,
				old.freelist, old.counters,
				new.freelist, new.counters,
				"unfreezing slab"));

		if (unlikely(!new.inuse && n->nr_partial >= s->min_partial)) {
			page->next = discard_page;
			discard_page = page;
		} else {
			add_partial(n, page, DEACTIVATE_TO_TAIL);
			stat(s, FREE_ADD_PARTIAL);
		}
	}

	if (n)
		spin_unlock(&n->list_lock);

	while (discard_page) {
		page = discard_page;
		discard_page = discard_page->next;

		stat(s, DEACTIVATE_EMPTY);
		discard_slab(s, page);
		stat(s, FREE_SLAB);
	}
#endif
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
158
54.30%
4
36.36%
JoonSoo Kim
83
28.52%
4
36.36%
David Shaohua Li
49
16.84%
2
18.18%
Dave Hansen
1
0.34%
1
9.09%
Total
291
100.00%
11
100.00%

/*
 * Put a page that was just frozen (in __slab_free) into a partial page
 * slot if available.
 *
 * If we did not find a slot then simply move all the partials to the
 * per node partial list.
 */


static void put_cpu_partial(struct kmem_cache *s, struct page *page, int drain)
{
#ifdef CONFIG_SLUB_CPU_PARTIAL
	struct page *oldpage;
	int pages;
	int pobjects;

	preempt_disable();
	do {
		pages = 0;
		pobjects = 0;
		oldpage = this_cpu_read(s->cpu_slab->partial);

		if (oldpage) {
			pobjects = oldpage->pobjects;
			pages = oldpage->pages;
			if (drain && pobjects > s->cpu_partial) {
				unsigned long flags;
				/*
                                 * partial array is full. Move the existing
                                 * set to the per node partial list.
                                 */
				local_irq_save(flags);
				unfreeze_partials(s, this_cpu_ptr(s->cpu_slab));
				local_irq_restore(flags);
				oldpage = NULL;
				pobjects = 0;
				pages = 0;
				stat(s, CPU_PARTIAL_DRAIN);
			}
		}

		pages++;
		pobjects += page->objects - page->inuse;

		page->pages = pages;
		page->pobjects = pobjects;
		page->next = oldpage;

	} while (this_cpu_cmpxchg(s->cpu_slab->partial, oldpage, page)
								!= oldpage);
	if (unlikely(!s->cpu_partial)) {
		unsigned long flags;

		local_irq_save(flags);
		unfreeze_partials(s, this_cpu_ptr(s->cpu_slab));
		local_irq_restore(flags);
	}
	preempt_enable();
#endif
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
164
72.57%
3
33.33%
Vladimir Davydov
44
19.47%
1
11.11%
JoonSoo Kim
10
4.42%
3
33.33%
Alex Shi
7
3.10%
1
11.11%
Fengguang Wu
1
0.44%
1
11.11%
Total
226
100.00%
9
100.00%



static inline void flush_slab(struct kmem_cache *s, struct kmem_cache_cpu *c)
{
	stat(s, CPUSLAB_FLUSH);
	deactivate_slab(s, c->page, c->freelist, c);

	c->tid = next_tid(c->tid);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
48
96.00%
6
85.71%
Wei Yang
2
4.00%
1
14.29%
Total
50
100.00%
7
100.00%

/*
 * Flush cpu slab.
 *
 * Called from IPI handler with interrupts disabled.
 */


static inline void __flush_cpu_slab(struct kmem_cache *s, int cpu)
{
	struct kmem_cache_cpu *c = per_cpu_ptr(s->cpu_slab, cpu);

	if (likely(c)) {
		if (c->page)
			flush_slab(s, c);

		unfreeze_partials(s, c);
	}
}

Contributors
Person
Tokens
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Christoph Lameter
58
100.00%
6
100.00%
Total
58
100.00%
6
100.00%



static void flush_cpu_slab(void *d)
{
	struct kmem_cache *s = d;

	__flush_cpu_slab(s, smp_processor_id());
}

Contributors
Person
Tokens
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CommitProp
Christoph Lameter
25
100.00%
2
100.00%
Total
25
100.00%
2
100.00%



static bool has_cpu_slab(int cpu, void *info)
{
	struct kmem_cache *s = info;
	struct kmem_cache_cpu *c = per_cpu_ptr(s->cpu_slab, cpu);

	return c->page || slub_percpu_partial(c);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Gilad Ben-Yossef
39
88.64%
1
33.33%
Wei Yang
3
6.82%
1
33.33%
Jianpeng Ma (马建朋)
2
4.55%
1
33.33%
Total
44
100.00%
3
100.00%



static void flush_all(struct kmem_cache *s)
{
	on_each_cpu_cond(has_cpu_slab, flush_cpu_slab, s, 1, GFP_ATOMIC);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
19
79.17%
1
50.00%
Gilad Ben-Yossef
5
20.83%
1
50.00%
Total
24
100.00%
2
100.00%

/*
 * Use the cpu notifier to insure that the cpu slabs are flushed when
 * necessary.
 */


static int slub_cpu_dead(unsigned int cpu)
{
	struct kmem_cache *s;
	unsigned long flags;

	mutex_lock(&slab_mutex);
	list_for_each_entry(s, &slab_caches, list) {
		local_irq_save(flags);
		__flush_cpu_slab(s, cpu);
		local_irq_restore(flags);
	}
	mutex_unlock(&slab_mutex);
	return 0;
}

Contributors
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Tokens
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Sebastian Andrzej Siewior
61
100.00%
1
100.00%
Total
61
100.00%
1
100.00%

/*
 * Check if the objects in a per cpu structure fit numa
 * locality expectations.
 */


static inline int node_match(struct page *page, int node)
{
#ifdef CONFIG_NUMA
	if (!page || (node != NUMA_NO_NODE && page_to_nid(page) != node))
		return 0;
#endif
	return 1;
}

Contributors
Person
Tokens
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CommitProp
Christoph Lameter
44
100.00%
5
100.00%
Total
44
100.00%
5
100.00%

#ifdef CONFIG_SLUB_DEBUG


static int count_free(struct page *page)
{
	return page->objects - page->inuse;
}

Contributors
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Tokens
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Pekka J Enberg
20
100.00%
1
100.00%
Total
20
100.00%
1
100.00%



static inline unsigned long node_nr_objs(struct kmem_cache_node *n)
{
	return atomic_long_read(&n->total_objects);
}
Contributors
Person
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David Rientjes
22
100.00%
1
100.00%
Total
22
100.00%
1
100.00%

#endif /* CONFIG_SLUB_DEBUG */

#if defined(CONFIG_SLUB_DEBUG) || defined(CONFIG_SYSFS)


static unsigned long count_partial(struct kmem_cache_node *n,
					int (*get_count)(struct page *))
{
	unsigned long flags;
	unsigned long x = 0;
	struct page *page;

	spin_lock_irqsave(&n->list_lock, flags);
	list_for_each_entry(page, &n->partial, lru)
		x += get_count(page);
	spin_unlock_irqrestore(&n->list_lock, flags);
	return x;
}
Contributors
Person
Tokens
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CommitProp
Pekka J Enberg
76
100.00%
1
100.00%
Total
76
100.00%
1
100.00%

#endif /* CONFIG_SLUB_DEBUG || CONFIG_SYSFS */


static noinline void

slab_out_of_memory(struct kmem_cache *s, gfp_t gfpflags, int nid)
{
#ifdef CONFIG_SLUB_DEBUG
	static DEFINE_RATELIMIT_STATE(slub_oom_rs, DEFAULT_RATELIMIT_INTERVAL,
				      DEFAULT_RATELIMIT_BURST);
	int node;
	struct kmem_cache_node *n;

	if ((gfpflags & __GFP_NOWARN) || !__ratelimit(&slub_oom_rs))
		return;

	pr_warn("SLUB: Unable to allocate memory on node %d, gfp=%#x(%pGg)\n",
		nid, gfpflags, &gfpflags);
	pr_warn("  cache: %s, object size: %u, buffer size: %u, default order: %u, min order: %u\n",
		s->name, s->object_size, s->size, oo_order(s->oo),
		oo_order(s->min));

	if (oo_order(s->min) > get_order(s->object_size))
		pr_warn("  %s debugging increased min order, use slub_debug=O to disable.\n",
			s->name);

	for_each_kmem_cache_node(s, node, n) {
		unsigned long nr_slabs;
		unsigned long nr_objs;
		unsigned long nr_free;

		nr_free  = count_partial(n, count_free);
		nr_slabs = node_nr_slabs(n);
		nr_objs  = node_nr_objs(n);

		pr_warn("  node %d: slabs: %ld, objs: %ld, free: %ld\n",
			node, nr_slabs, nr_objs, nr_free);
	}
#endif
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Pekka J Enberg
99
54.10%
1
10.00%
David Rientjes
53
28.96%
2
20.00%
Christoph Lameter
13
7.10%
3
30.00%
Alexander Beregalov
8
4.37%
1
10.00%
Fabian Frederick
5
2.73%
1
10.00%
Vlastimil Babka
4
2.19%
1
10.00%
Alexey Dobriyan
1
0.55%
1
10.00%
Total
183
100.00%
10
100.00%



static inline void *new_slab_objects(struct kmem_cache *s, gfp_t flags,
			int node, struct kmem_cache_cpu **pc)
{
	void *freelist;
	struct kmem_cache_cpu *c = *pc;
	struct page *page;

	freelist = get_partial(s, flags, node, c);

	if (freelist)
		return freelist;

	page = new_slab(s, flags, node);
	if (page) {
		c = raw_cpu_ptr(s->cpu_slab);
		if (c->page)
			flush_slab(s, c);

		/*
                 * No other reference to the page yet so we can
                 * muck around with it freely without cmpxchg
                 */
		freelist = page->freelist;
		page->freelist = NULL;

		stat(s, ALLOC_SLAB);
		c->page = page;
		*pc = c;
	} else
		freelist = NULL;

	return freelist;
}

Contributors
Person
Tokens
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Christoph Lameter
140
100.00%
4
100.00%
Total
140
100.00%
4
100.00%



static inline bool pfmemalloc_match(struct page *page, gfp_t gfpflags)
{
	if (unlikely(PageSlabPfmemalloc(page)))
		return gfp_pfmemalloc_allowed(gfpflags);

	return true;
}

Contributors
Person
Tokens
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CommitProp
Mel Gorman
34
100.00%
1
100.00%
Total
34
100.00%
1
100.00%

/*
 * Check the page->freelist of a page and either transfer the freelist to the
 * per cpu freelist or deactivate the page.
 *
 * The page is still frozen if the return value is not NULL.
 *
 * If this function returns NULL then the page has been unfrozen.
 *
 * This function must be called with interrupt disabled.
 */


static inline void *get_freelist(struct kmem_cache *s, struct page *page)
{
	struct page new;
	unsigned long counters;
	void *freelist;

	do {
		freelist = page->freelist;
		counters = page->counters;

		new.counters = counters;
		VM_BUG_ON(!new.frozen);

		new.inuse = page->objects;
		new.frozen = freelist != NULL;

	} while (!__cmpxchg_double_slab(s, page,
		freelist, counters,
		NULL, new.counters,
		"get_freelist"));

	return freelist;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
99
98.02%
1
33.33%
Dave Hansen
1
0.99%
1
33.33%
JoonSoo Kim
1
0.99%
1
33.33%
Total
101
100.00%
3
100.00%

/*
 * Slow path. The lockless freelist is empty or we need to perform
 * debugging duties.
 *
 * Processing is still very fast if new objects have been freed to the
 * regular freelist. In that case we simply take over the regular freelist
 * as the lockless freelist and zap the regular freelist.
 *
 * If that is not working then we fall back to the partial lists. We take the
 * first element of the freelist as the object to allocate now and move the
 * rest of the freelist to the lockless freelist.
 *
 * And if we were unable to get a new slab from the partial slab lists then
 * we need to allocate a new slab. This is the slowest path since it involves
 * a call to the page allocator and the setup of a new slab.
 *
 * Version of __slab_alloc to use when we know that interrupts are
 * already disabled (which is the case for bulk allocation).
 */


static void *___slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node,
			  unsigned long addr, struct kmem_cache_cpu *c)
{
	void *freelist;
	struct page *page;

	page = c->page;
	if (!page)
		goto new_slab;
redo:

	if (unlikely(!node_match(page, node))) {
		int searchnode = node;

		if (node != NUMA_NO_NODE && !node_present_pages(node))
			searchnode = node_to_mem_node(node);

		if (unlikely(!node_match(page, searchnode))) {
			stat(s, ALLOC_NODE_MISMATCH);
			deactivate_slab(s, page, c->freelist, c);
			goto new_slab;
		}
	}

	/*
         * By rights, we should be searching for a slab page that was
         * PFMEMALLOC but right now, we are losing the pfmemalloc
         * information when the page leaves the per-cpu allocator
         */
	if (unlikely(!pfmemalloc_match(page, gfpflags))) {
		deactivate_slab(s, page, c->freelist, c);
		goto new_slab;
	}

	/* must check again c->freelist in case of cpu migration or IRQ */
	freelist = c->freelist;
	if (freelist)
		goto load_freelist;

	freelist = get_freelist(s, page);

	if (!freelist) {
		c->page = NULL;
		stat(s, DEACTIVATE_BYPASS);
		goto new_slab;
	}

	stat(s, ALLOC_REFILL);

load_freelist:
	/*
         * freelist is pointing to the list of objects to be used.
         * page is pointing to the page from which the objects are obtained.
         * That page must be frozen for per cpu allocations to work.
         */
	VM_BUG_ON(!c->page->frozen);
	c->freelist = get_freepointer(s, freelist);
	c->tid = next_tid(c->tid);
	return freelist;

new_slab:

	if (slub_percpu_partial(c)) {
		page = c->page = slub_percpu_partial(c);
		slub_set_percpu_partial(c, page);
		stat(s, CPU_PARTIAL_ALLOC);
		goto redo;
	}

	freelist = new_slab_objects(s, gfpflags, node, &c);

	if (unlikely(!freelist)) {
		slab_out_of_memory(s, gfpflags, node);
		return NULL;
	}

	page = c->page;
	if (likely(!kmem_cache_debug(s) && pfmemalloc_match(page, gfpflags)))
		goto load_freelist;

	/* Only entered in the debug case */
	if (kmem_cache_debug(s) &&
			!alloc_debug_processing(s, page, freelist, addr))
		goto new_slab;	/* Slab failed checks. Next slab needed */

	deactivate_slab(s, page, get_freepointer(s, freelist), c);
	return freelist;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
292
73.55%
32
78.05%
JoonSoo Kim
39
9.82%
1
2.44%
Mel Gorman
30
7.56%
1
2.44%
Wei Yang
16
4.03%
2
4.88%
Pekka J Enberg
9
2.27%
1
2.44%
Eric Dumazet
7
1.76%
1
2.44%
Eduard - Gabriel Munteanu
2
0.50%
1
2.44%
David Rientjes
1
0.25%
1
2.44%
Dave Hansen
1
0.25%
1
2.44%
Total
397
100.00%
41
100.00%

/*
 * Another one that disabled interrupt and compensates for possible
 * cpu changes by refetching the per cpu area pointer.
 */


static void *__slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node,
			  unsigned long addr, struct kmem_cache_cpu *c)
{
	void *p;
	unsigned long flags;

	local_irq_save(flags);
#ifdef CONFIG_PREEMPT
	/*
         * We may have been preempted and rescheduled on a different
         * cpu before disabling interrupts. Need to reload cpu area
         * pointer.
         */
	c = this_cpu_ptr(s->cpu_slab);
#endif

	p = ___slab_alloc(s, gfpflags, node, addr, c);
	local_irq_restore(flags);
	return p;
}

Contributors
Person
Tokens
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Christoph Lameter
78
100.00%
3
100.00%
Total
78
100.00%
3
100.00%

/*
 * Inlined fastpath so that allocation functions (kmalloc, kmem_cache_alloc)
 * have the fastpath folded into their functions. So no function call
 * overhead for requests that can be satisfied on the fastpath.
 *
 * The fastpath works by first checking if the lockless freelist can be used.
 * If not then __slab_alloc is called for slow processing.
 *
 * Otherwise we can simply pick the next object from the lockless free list.
 */


static __always_inline void *slab_alloc_node(struct kmem_cache *s,
		gfp_t gfpflags, int node, unsigned long addr)
{
	void *object;
	struct kmem_cache_cpu *c;
	struct page *page;
	unsigned long tid;

	s = slab_pre_alloc_hook(s, gfpflags);
	if (!s)
		return NULL;
redo:
	/*
         * Must read kmem_cache cpu data via this cpu ptr. Preemption is
         * enabled. We may switch back and forth between cpus while
         * reading from one cpu area. That does not matter as long
         * as we end up on the original cpu again when doing the cmpxchg.
         *
         * We should guarantee that tid and kmem_cache are retrieved on
         * the same cpu. It could be different if CONFIG_PREEMPT so we need
         * to check if it is matched or not.
         */
	do {
		tid = this_cpu_read(s->cpu_slab->tid);
		c = raw_cpu_ptr(s->cpu_slab);
	} while (IS_ENABLED(CONFIG_PREEMPT) &&
		 unlikely(tid != READ_ONCE(c->tid)));

	/*
         * Irqless object alloc/free algorithm used here depends on sequence
         * of fetching cpu_slab's data. tid should be fetched before anything
         * on c to guarantee that object and page associated with previous tid
         * won't be used with current tid. If we fetch tid first, object and
         * page could be one associated with next tid and our alloc/free
         * request will be failed. In this case, we will retry. So, no problem.
         */
	barrier();

	/*
         * The transaction ids are globally unique per cpu and per operation on
         * a per cpu queue. Thus they can be guarantee that the cmpxchg_double
         * occurs on the right processor and that there was no operation on the
         * linked list in between.
         */

	object = c->freelist;
	page = c->page;
	if (unlikely(!object || !node_match(page, node))) {
		object = __slab_alloc(s, gfpflags, node, addr, c);
		stat(s, ALLOC_SLOWPATH);
	} else {
		void *next_object = get_freepointer_safe(s, object);

		/*
                 * The cmpxchg will only match if there was no additional
                 * operation and if we are on the right processor.
                 *
                 * The cmpxchg does the following atomically (without lock
                 * semantics!)
                 * 1. Relocate first pointer to the current per cpu area.
                 * 2. Verify that tid and freelist have not been changed
                 * 3. If they were not changed replace tid and freelist
                 *
                 * Since this is without lock semantics the protection is only
                 * against code executing on this cpu *not* from access by
                 * other cpus.
                 */
		if (unlikely(!this_cpu_cmpxchg_double(
				s->cpu_slab->freelist, s->cpu_slab->tid,
				object, tid,
				next_object, next_tid(tid)))) {

			note_cmpxchg_failure("slab_alloc", s, tid);
			goto redo;
		}
		prefetch_freepointer(s, next_object);
		stat(s, ALLOC_FASTPATH);
	}

	if (unlikely(gfpflags & __GFP_ZERO) && object)
		memset(object, 0, s->object_size);

	slab_post_alloc_hook(s, gfpflags, 1, &object);

	return object;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
174
63.74%
15
50.00%
JoonSoo Kim
31
11.36%
1
3.33%
Eric Dumazet
19
6.96%
1
3.33%
Akinobu Mita
9
3.30%
1
3.33%
Dave Hansen
9
3.30%
1
3.33%
Vladimir Davydov
7
2.56%
1
3.33%
Vegard Nossum
6
2.20%
1
3.33%
Dmitry Adamushko
4
1.47%
1
3.33%
Mark Rutland
3
1.10%
1
3.33%
Jesper Dangaard Brouer
3
1.10%
1
3.33%
Pekka J Enberg
2
0.73%
2
6.67%
Catalin Marinas
2
0.73%
1
3.33%
Eduard - Gabriel Munteanu
2
0.73%
1
3.33%
Chen Gang S
1
0.37%
1
3.33%
Ezequiel García
1
0.37%
1
3.33%
Total
273
100.00%
30
100.00%



static __always_inline void *slab_alloc(struct kmem_cache *s,
		gfp_t gfpflags, unsigned long addr)
{
	return slab_alloc_node(s, gfpflags, NUMA_NO_NODE, addr);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Ezequiel García
32
100.00%
1
100.00%
Total
32
100.00%
1
100.00%



void *kmem_cache_alloc(struct kmem_cache *s, gfp_t gfpflags)
{
	void *ret = slab_alloc(s, gfpflags, _RET_IP_);

	trace_kmem_cache_alloc(_RET_IP_, ret, s->object_size,
				s->size, gfpflags);

	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
24
51.06%
2
40.00%
Eduard - Gabriel Munteanu
23
48.94%
3
60.00%
Total
47
100.00%
5
100.00%

EXPORT_SYMBOL(kmem_cache_alloc);

#ifdef CONFIG_TRACING


void *kmem_cache_alloc_trace(struct kmem_cache *s, gfp_t gfpflags, size_t size)
{
	void *ret = slab_alloc(s, gfpflags, _RET_IP_);
	trace_kmalloc(_RET_IP_, ret, size, s->size, gfpflags);
	kasan_kmalloc(s, ret, size, gfpflags);
	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Richard Kennedy
28
47.46%
1
25.00%
Eduard - Gabriel Munteanu
20
33.90%
1
25.00%
Andrey Ryabinin
9
15.25%
1
25.00%
Alexander Potapenko
2
3.39%
1
25.00%
Total
59
100.00%
4
100.00%

EXPORT_SYMBOL(kmem_cache_alloc_trace);
#endif

#ifdef CONFIG_NUMA


void *kmem_cache_alloc_node(struct kmem_cache *s, gfp_t gfpflags, int node)
{
	void *ret = slab_alloc_node(s, gfpflags, node, _RET_IP_);

	trace_kmem_cache_alloc_node(_RET_IP_, ret,
				    s->object_size, s->size, gfpflags, node);

	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
28
51.85%
3
42.86%
Eduard - Gabriel Munteanu
25
46.30%
3
42.86%
Ezequiel García
1
1.85%
1
14.29%
Total
54
100.00%
7
100.00%

EXPORT_SYMBOL(kmem_cache_alloc_node);

#ifdef CONFIG_TRACING


void *kmem_cache_alloc_node_trace(struct kmem_cache *s,
				    gfp_t gfpflags,
				    int node, size_t size)
{
	void *ret = slab_alloc_node(s, gfpflags, node, _RET_IP_);

	trace_kmalloc_node(_RET_IP_, ret,
			   size, s->size, gfpflags, node);

	kasan_kmalloc(s, ret, size, gfpflags);
	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Richard Kennedy
28
42.42%
1
20.00%
Eduard - Gabriel Munteanu
26
39.39%
1
20.00%
Andrey Ryabinin
9
13.64%
1
20.00%
Alexander Potapenko
2
3.03%
1
20.00%
Ezequiel García
1
1.52%
1
20.00%
Total
66
100.00%
5
100.00%

EXPORT_SYMBOL(kmem_cache_alloc_node_trace);
#endif
#endif

/*
 * Slow path handling. This may still be called frequently since objects
 * have a longer lifetime than the cpu slabs in most processing loads.
 *
 * So we still attempt to reduce cache line usage. Just take the slab
 * lock and free the item. If there is no additional partial page
 * handling required then we can return immediately.
 */


static void __slab_free(struct kmem_cache *s, struct page *page,
			void *head, void *tail, int cnt,
			unsigned long addr)

{
	void *prior;
	int was_frozen;
	struct page new;
	unsigned long counters;
	struct kmem_cache_node *n = NULL;
	unsigned long uninitialized_var(flags);

	stat(s, FREE_SLOWPATH);

	if (kmem_cache_debug(s) &&
	    !free_debug_processing(s, page, head, tail, cnt, addr))
		return;

	do {
		if (unlikely(n)) {
			spin_unlock_irqrestore(&n->list_lock, flags);
			n = NULL;
		}
		prior = page->freelist;
		counters = page->counters;
		set_freepointer(s, tail, prior);
		new.counters = counters;
		was_frozen = new.frozen;
		new.inuse -= cnt;
		if ((!new.inuse || !prior) && !was_frozen) {

			if (kmem_cache_has_cpu_partial(s) && !prior) {

				/*
                                 * Slab was on no list before and will be
                                 * partially empty
                                 * We can defer the list move and instead
                                 * freeze it.
                                 */
				new.frozen = 1;

			} else { /* Needs to be taken off a list */

				n = get_node(s, page_to_nid(page));
				/*
                                 * Speculatively acquire the list_lock.
                                 * If the cmpxchg does not succeed then we may
                                 * drop the list_lock without any processing.
                                 *
                                 * Otherwise the list_lock will synchronize with
                                 * other processors updating the list of slabs.
                                 */
				spin_lock_irqsave(&n->list_lock, flags);

			}
		}

	} while (!cmpxchg_double_slab(s, page,
		prior, counters,
		head, new.counters,
		"__slab_free"));

	if (likely(!n)) {

		/*
                 * If we just froze the page then put it onto the
                 * per cpu partial list.
                 */
		if (new.frozen && !was_frozen) {
			put_cpu_partial(s, page, 1);
			stat(s, CPU_PARTIAL_FREE);
		}
		/*
                 * The list lock was not taken therefore no list
                 * activity can be necessary.
                 */
		if (was_frozen)
			stat(s, FREE_FROZEN);
		return;
	}

	if (unlikely(!new.inuse && n->nr_partial >= s->min_partial))
		goto slab_empty;

	/*
         * Objects left in the slab. If it was not on the partial list before
         * then add it.
         */
	if (!kmem_cache_has_cpu_partial(s) && unlikely(!prior)) {
		if (kmem_cache_debug(s))
			remove_full(s, n, page);
		add_partial(n, page, DEACTIVATE_TO_TAIL);
		stat(s, FREE_ADD_PARTIAL);
	}
	spin_unlock_irqrestore(&n->list_lock, flags);
	return;

slab_empty:
	if (prior) {
		/*
                 * Slab on the partial list.
                 */
		remove_partial(n, page);
		stat(s, FREE_REMOVE_PARTIAL);
	} else {
		/* Slab must be on the full list */
		remove_full(s, n, page);
	}

	spin_unlock_irqrestore(&n->list_lock, flags);
	stat(s, FREE_SLAB);
	discard_slab(s, page);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
355
81.80%
19
67.86%
JoonSoo Kim
41
9.45%
3
10.71%
Jesper Dangaard Brouer
17
3.92%
1
3.57%
Alex Shi
9
2.07%
1
3.57%
Peter Zijlstra
8
1.84%
1
3.57%
Eduard - Gabriel Munteanu
2
0.46%
1
3.57%
David Shaohua Li
1
0.23%
1
3.57%
Chen Gang S
1
0.23%
1
3.57%
Total
434
100.00%
28
100.00%

/*
 * Fastpath with forced inlining to produce a kfree and kmem_cache_free that
 * can perform fastpath freeing without additional function calls.
 *
 * The fastpath is only possible if we are freeing to the current cpu slab
 * of this processor. This typically the case if we have just allocated
 * the item before.
 *
 * If fastpath is not possible then fall back to __slab_free where we deal
 * with all sorts of special processing.
 *
 * Bulk free of a freelist with several objects (all pointing to the
 * same page) possible by specifying head and tail ptr, plus objects
 * count (cnt). Bulk free indicated by tail pointer being set.
 */


static __always_inline void do_slab_free(struct kmem_cache *s,
				struct page *page, void *head, void *tail,
				int cnt, unsigned long addr)
{
	void *tail_obj = tail ? : head;
	struct kmem_cache_cpu *c;
	unsigned long tid;
redo:
	/*
         * Determine the currently cpus per cpu slab.
         * The cpu may change afterward. However that does not matter since
         * data is retrieved via this pointer. If we are on the same cpu
         * during the cmpxchg then the free will succeed.
         */
	do {
		tid = this_cpu_read(s->cpu_slab->tid);
		c = raw_cpu_ptr(s->cpu_slab);
	} while (IS_ENABLED(CONFIG_PREEMPT) &&
		 unlikely(tid != READ_ONCE(c->tid)));

	/* Same with comment on barrier() in slab_alloc_node() */
	barrier();

	if (likely(page == c->page)) {
		set_freepointer(s, tail_obj, c->freelist);

		if (unlikely(!this_cpu_cmpxchg_double(
				s->cpu_slab->freelist, s->cpu_slab->tid,
				c->freelist, tid,
				head, next_tid(tid)))) {

			note_cmpxchg_failure("slab_free", s, tid);
			goto redo;
		}
		stat(s, FREE_FASTPATH);
	} else
		__slab_free(s, page, head, tail_obj, cnt, addr);

}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
138
70.77%
9
56.25%
JoonSoo Kim
29
14.87%
1
6.25%
Jesper Dangaard Brouer
21
10.77%
2
12.50%
Mark Rutland
3
1.54%
1
6.25%
Eduard - Gabriel Munteanu
2
1.03%
1
6.25%
Alexander Potapenko
1
0.51%
1
6.25%
Pekka J Enberg
1
0.51%
1
6.25%
Total
195
100.00%
16
100.00%



static __always_inline void slab_free(struct kmem_cache *s, struct page *page,
				      void *head, void *tail, int cnt,
				      unsigned long addr)
{
	/*
         * With KASAN enabled slab_free_freelist_hook modifies the freelist
         * to remove objects, whose reuse must be delayed.
         */
	if (slab_free_freelist_hook(s, &head, &tail))
		do_slab_free(s, page, head, tail, cnt, addr);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Alexander Potapenko
56
91.80%
1
50.00%
Andrey Konovalov
5
8.20%
1
50.00%
Total
61
100.00%
2
100.00%

#ifdef CONFIG_KASAN


void ___cache_free(struct kmem_cache *cache, void *x, unsigned long addr)
{
	do_slab_free(cache, virt_to_head_page(x), x, NULL, 1, addr);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Alexander Potapenko
36
100.00%
1
100.00%
Total
36
100.00%
1
100.00%

#endif



void kmem_cache_free(struct kmem_cache *s, void *x)
{
	s = cache_from_obj(s, x);
	if (!s)
		return;
	slab_free(s, virt_to_head_page(x), x, NULL, 1, _RET_IP_);
	trace_kmem_cache_free(_RET_IP_, x);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
35
64.81%
3
37.50%
Glauber de Oliveira Costa
9
16.67%
1
12.50%
Eduard - Gabriel Munteanu
6
11.11%
3
37.50%
Jesper Dangaard Brouer
4
7.41%
1
12.50%
Total
54
100.00%
8
100.00%

EXPORT_SYMBOL(kmem_cache_free);


struct detached_freelist {
	
struct page *page;
	
void *tail;
	
void *freelist;
	
int cnt;
	
struct kmem_cache *s;
};

/*
 * This function progressively scans the array with free objects (with
 * a limited look ahead) and extract objects belonging to the same
 * page.  It builds a detached freelist directly within the given
 * page/objects.  This can happen without any need for
 * synchronization, because the objects are owned by running process.
 * The freelist is build up as a single linked list in the objects.
 * The idea is, that this detached freelist can then be bulk
 * transferred to the real freelist(s), but only requiring a single
 * synchronization primitive.  Look ahead in the array is limited due
 * to performance reasons.
 */

static inline

int build_detached_freelist(struct kmem_cache *s, size_t size,
			    void **p, struct detached_freelist *df)
{
	size_t first_skipped_index = 0;
	int lookahead = 3;
	void *object;
	struct page *page;

	/* Always re-init detached_freelist */
	df->page = NULL;

	do {
		object = p[--size];
		/* Do we need !ZERO_OR_NULL_PTR(object) here? (for kfree) */
	} while (!object && size);

	if (!object)
		return 0;

	page = virt_to_head_page(object);
	if (!s) {
		/* Handle kalloc'ed objects */
		if (unlikely(!PageSlab(page))) {
			BUG_ON(!PageCompound(page));
			kfree_hook(object);
			__free_pages(page, compound_order(page));
			p[size] = NULL; /* mark object processed */
			return size;
		}
		/* Derive kmem_cache from object */
		df->s = page->slab_cache;
	} else {
		df->s = cache_from_obj(s, object); /* Support for memcg */
	}

	/* Start new detached freelist */
	df->page = page;
	set_freepointer(df->s, object, NULL);
	df->tail = object;
	df->freelist = object;
	p[size] = NULL; /* mark object processed */
	df->cnt = 1;

	while (size) {
		object = p[--size];
		if (!object)
			continue; /* Skip processed objects */

		/* df->page is always set at this point */
		if (df->page == virt_to_head_page(object)) {
			/* Opportunity build freelist */
			set_freepointer(df->s, object, df->freelist);
			df->freelist = object;
			df->cnt++;
			p[size] = NULL; /* mark object processed */

			continue;
		}

		/* Limit look ahead search */
		if (!--lookahead)
			break;

		if (!first_skipped_index)
			first_skipped_index = size + 1;
	}

	return first_skipped_index;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jesper Dangaard Brouer
287
95.35%
5
71.43%
Christoph Lameter
13
4.32%
1
14.29%
Vladimir Davydov
1
0.33%
1
14.29%
Total
301
100.00%
7
100.00%

/* Note that interrupts must be enabled when calling this function. */


void kmem_cache_free_bulk(struct kmem_cache *s, size_t size, void **p)
{
	if (WARN_ON(!size))
		return;

	do {
		struct detached_freelist df;

		size = build_detached_freelist(s, size, p, &df);
		if (!df.page)
			continue;

		slab_free(df.s, df.page, df.freelist, df.tail, df.cnt,_RET_IP_);
	} while (likely(size));
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Jesper Dangaard Brouer
88
98.88%
4
80.00%
Christoph Lameter
1
1.12%
1
20.00%
Total
89
100.00%
5
100.00%

EXPORT_SYMBOL(kmem_cache_free_bulk);

/* Note that interrupts must be enabled when calling this function. */


int kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags, size_t size,
			  void **p)
{
	struct kmem_cache_cpu *c;
	int i;

	/* memcg and kmem_cache debug support */
	s = slab_pre_alloc_hook(s, flags);
	if (unlikely(!s))
		return false;
	/*
         * Drain objects in the per cpu slab, while disabling local
         * IRQs, which protects against PREEMPT and interrupts
         * handlers invoking normal fastpath.
         */
	local_irq_disable();
	c = this_cpu_ptr(s->cpu_slab);

	for (i = 0; i < size; i++) {
		void *object = c->freelist;

		if (unlikely(!object)) {
			/*
                         * Invoking slow path likely have side-effect
                         * of re-populating per CPU c->freelist
                         */
			p[i] = ___slab_alloc(s, flags, NUMA_NO_NODE,
					    _RET_IP_, c);
			if (unlikely(!p[i]))
				goto error;

			c = this_cpu_ptr(s->cpu_slab);
			continue; /* goto for-loop */
		}
		c->freelist = get_freepointer(s, object);
		p[i] = object;
	}
	c->tid = next_tid(c->tid);
	local_irq_enable();

	/* Clear memory outside IRQ disabled fastpath loop */
	if (unlikely(flags & __GFP_ZERO)) {
		int j;

		for (j = 0; j < i; j++)
			memset(p[j], 0, s->object_size);
	}

	/* memcg and kmem_cache debug support */
	slab_post_alloc_hook(s, flags, size, p);
	return i;
error:
	local_irq_enable();
	slab_post_alloc_hook(s, flags, i, p);
	__kmem_cache_free_bulk(s, i, p);
	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Jesper Dangaard Brouer
220
85.60%
4
66.67%
Christoph Lameter
37
14.40%
2
33.33%
Total
257
100.00%
6
100.00%

EXPORT_SYMBOL(kmem_cache_alloc_bulk);


/*
 * Object placement in a slab is made very easy because we always start at
 * offset 0. If we tune the size of the object to the alignment then we can
 * get the required alignment by putting one properly sized object after
 * another.
 *
 * Notice that the allocation order determines the sizes of the per cpu
 * caches. Each processor has always one slab available for allocations.
 * Increasing the allocation order reduces the number of times that slabs
 * must be moved on and off the partial lists and is therefore a factor in
 * locking overhead.
 */

/*
 * Mininum / Maximum order of slab pages. This influences locking overhead
 * and slab fragmentation. A higher order reduces the number of partial slabs
 * and increases the number of allocations possible without having to
 * take the list_lock.
 */

static unsigned int slub_min_order;

static unsigned int slub_max_order = PAGE_ALLOC_COSTLY_ORDER;

static unsigned int slub_min_objects;

/*
 * Calculate the order of allocation given an slab object size.
 *
 * The order of allocation has significant impact on performance and other
 * system components. Generally order 0 allocations should be preferred since
 * order 0 does not cause fragmentation in the page allocator. Larger objects
 * be problematic to put into order 0 slabs because there may be too much
 * unused space left. We go to a higher order if more than 1/16th of the slab
 * would be wasted.
 *
 * In order to reach satisfactory performance we must ensure that a minimum
 * number of objects is in one slab. Otherwise we may generate too much
 * activity on the partial lists which requires taking the list_lock. This is
 * less a concern for large slabs though which are rarely used.
 *
 * slub_max_order specifies the order where we begin to stop considering the
 * number of objects in a slab as critical. If we reach slub_max_order then
 * we try to keep the page order as low as possible. So we accept more waste
 * of space in favor of a small page order.
 *
 * Higher order allocations also allow the placement of more objects in a
 * slab and thereby reduce object handling overhead. If the user has
 * requested a higher mininum order then we start with that one instead of
 * the smallest order which will fit the object.
 */


static inline unsigned int slab_order(unsigned int size,
		unsigned int min_objects, unsigned int max_order,
		unsigned int fract_leftover, unsigned int reserved)
{
	unsigned int min_order = slub_min_order;
	unsigned int order;

	if (order_objects(min_order, size, reserved) > MAX_OBJS_PER_PAGE)
		return get_order(size * MAX_OBJS_PER_PAGE) - 1;

	for (order = max(min_order, (unsigned int)get_order(min_objects * size + reserved));
			order <= max_order; order++) {

		unsigned int slab_size = (unsigned int)PAGE_SIZE << order;
		unsigned int rem;

		rem = (slab_size - reserved) % size;

		if (rem <= slab_size / fract_leftover)
			break;
	}

	return order;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
88
67.69%
4
44.44%
Alexey Dobriyan
24
18.46%
1
11.11%
Lai Jiangshan
13
10.00%
1
11.11%
Wei Yang
3
2.31%
2
22.22%
Cyrill V. Gorcunov
2
1.54%
1
11.11%
Total
130
100.00%
9
100.00%



static inline int calculate_order(unsigned int size, unsigned int reserved)
{
	unsigned int order;
	unsigned int min_objects;
	unsigned int max_objects;

	/*
         * Attempt to find best configuration for a slab. This
         * works by first attempting to generate a layout with
         * the best configuration and backing off gradually.
         *
         * First we increase the acceptable waste in a slab. Then
         * we reduce the minimum objects required in a slab.
         */
	min_objects = slub_min_objects;
	if (!min_objects)
		min_objects = 4 * (fls(nr_cpu_ids) + 1);
	max_objects = order_objects(slub_max_order, size, reserved);
	min_objects = min(min_objects, max_objects);

	while (min_objects > 1) {
		unsigned int fraction;

		fraction = 16;
		while (fraction >= 4) {
			order = slab_order(size, min_objects,
					slub_max_order, fraction, reserved);
			if (order <= slub_max_order)
				return order;
			fraction /= 2;
		}
		min_objects--;
	}

	/*
         * We were unable to place multiple objects in a slab. Now
         * lets see if we can place a single object there.
         */
	order = slab_order(size, 1, slub_max_order, 1, reserved);
	if (order <= slub_max_order)
		return order;

	/*
         * Doh this slab cannot be placed using slub_max_order.
         */
	order = slab_order(size, 1, MAX_ORDER, 1, reserved);
	if (order < MAX_ORDER)
		return order;
	return -ENOSYS;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
135
75.42%
5
50.00%
Yanmin Zhang
18
10.06%
1
10.00%
Lai Jiangshan
15
8.38%
1
10.00%
Alexey Dobriyan
9
5.03%
1
10.00%
David Rientjes
1
0.56%
1
10.00%
Wei Yang
1
0.56%
1
10.00%
Total
179
100.00%
10
100.00%


static void

init_kmem_cache_node(struct kmem_cache_node *n)
{
	n->nr_partial = 0;
	spin_lock_init(&n->list_lock);
	INIT_LIST_HEAD(&n->partial);
#ifdef CONFIG_SLUB_DEBUG
	atomic_long_set(&n->nr_slabs, 0);
	atomic_long_set(&n->total_objects, 0);
	INIT_LIST_HEAD(&n->full);
#endif
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
58
87.88%
7
77.78%
Salman Qazi
7
10.61%
1
11.11%
Rusty Russell
1
1.52%
1
11.11%
Total
66
100.00%
9
100.00%



static inline int alloc_kmem_cache_cpus(struct kmem_cache *s)
{
	BUILD_BUG_ON(PERCPU_DYNAMIC_EARLY_SIZE <
			KMALLOC_SHIFT_HIGH * sizeof(struct kmem_cache_cpu));

	/*
         * Must align to double word boundary for the double cmpxchg
         * instructions to work; see __pcpu_double_call_return_bool().
         */
	s->cpu_slab = __alloc_percpu(sizeof(struct kmem_cache_cpu),
				     2 * sizeof(void *));

	if (!s->cpu_slab)
		return 0;

	init_kmem_cache_cpus(s);

	return 1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
64
98.46%
5
83.33%
Chris Metcalf
1
1.54%
1
16.67%
Total
65
100.00%
6
100.00%


static struct kmem_cache *kmem_cache_node;

/*
 * No kmalloc_node yet so do it by hand. We know that this is the first
 * slab on the node for this slabcache. There are no concurrent accesses
 * possible.
 *
 * Note that this function only works on the kmem_cache_node
 * when allocating for the kmem_cache_node. This is used for bootstrapping
 * memory on a fresh node that has no slab structures yet.
 */


static void early_kmem_cache_node_alloc(int node)
{
	struct page *page;
	struct kmem_cache_node *n;

	BUG_ON(kmem_cache_node->size < sizeof(struct kmem_cache_node));

	page = new_slab(kmem_cache_node, GFP_NOWAIT, node);

	BUG_ON(!page);
	if (page_to_nid(page) != node) {
		pr_err("SLUB: Unable to allocate memory from node %d\n", node);
		pr_err("SLUB: Allocating a useless per node structure in order to be able to continue\n");
	}

	n = page->freelist;
	BUG_ON(!n);
	page->freelist = get_freepointer(kmem_cache_node, n);
	page->inuse = 1;
	page->frozen = 0;
	kmem_cache_node->node[node] = n;
#ifdef CONFIG_SLUB_DEBUG
	init_object(kmem_cache_node, n, SLUB_RED_ACTIVE);
	init_tracking(kmem_cache_node, n);
#endif
	kasan_kmalloc(kmem_cache_node, n, sizeof(struct kmem_cache_node),
		      GFP_KERNEL);
	init_kmem_cache_node(n);
	inc_slabs_node(kmem_cache_node, node, page->objects);

	/*
         * No locks need to be taken here as it has just been
         * initialized and there is no concurrent access.
         */
	__add_partial(n, page, DEACTIVATE_TO_HEAD);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
155
87.08%
14
70.00%
Andrey Ryabinin
13
7.30%
1
5.00%
Fabian Frederick
4
2.25%
1
5.00%
Alexander Potapenko
2
1.12%
1
5.00%
Steven Rostedt
2
1.12%
1
5.00%
David Shaohua Li
1
0.56%
1
5.00%
David Rientjes
1
0.56%
1
5.00%
Total
178
100.00%
20
100.00%



static void free_kmem_cache_nodes(struct kmem_cache *s)
{
	int node;
	struct kmem_cache_node *n;

	for_each_kmem_cache_node(s, node, n) {
		s->node[node] = NULL;
		kmem_cache_free(kmem_cache_node, n);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
38
84.44%
2
66.67%
Alexander Potapenko
7
15.56%
1
33.33%
Total
45
100.00%
3
100.00%



void __kmem_cache_release(struct kmem_cache *s)
{
	cache_random_seq_destroy(s);
	free_percpu(s->cpu_slab);
	free_kmem_cache_nodes(s);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dmitry Safonov
22
81.48%
1
50.00%
Thomas Garnier
5
18.52%
1
50.00%
Total
27
100.00%
2
100.00%



static int init_kmem_cache_nodes(struct kmem_cache *s)
{
	int node;

	for_each_node_state(node, N_NORMAL_MEMORY) {
		struct kmem_cache_node *n;

		if (slab_state == DOWN) {
			early_kmem_cache_node_alloc(node);
			continue;
		}
		n = kmem_cache_alloc_node(kmem_cache_node,
						GFP_KERNEL, node);

		if (!n) {
			free_kmem_cache_nodes(s);
			return 0;
		}

		init_kmem_cache_node(n);
		s->node[node] = n;
	}
	return 1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
79
94.05%
4
80.00%
Alexander Potapenko
5
5.95%
1
20.00%
Total
84
100.00%
5
100.00%



static void set_min_partial(struct kmem_cache *s, unsigned long min)
{
	if (min < MIN_PARTIAL)
		min = MIN_PARTIAL;
	else if (min > MAX_PARTIAL)
		min = MAX_PARTIAL;
	s->min_partial = min;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Rientjes
42
100.00%
2
100.00%
Total
42
100.00%
2
100.00%



static void set_cpu_partial(struct kmem_cache *s)
{
#ifdef CONFIG_SLUB_CPU_PARTIAL
	/*
         * cpu_partial determined the maximum number of objects kept in the
         * per cpu partial lists of a processor.
         *
         * Per cpu partial lists mainly contain slabs that just have one
         * object freed. If they are used for allocation then they can be
         * filled up again with minimal effort. The slab will never hit the
         * per node partial lists and therefore no locking will be required.
         *
         * This setting also determines
         *
         * A) The number of objects from per cpu partial slabs dumped to the
         *    per node list when we reach the limit.
         * B) The number of objects in cpu partial slabs to extract from the
         *    per node list when we run out of per cpu objects. We only fetch
         *    50% to keep some capacity around for frees.
         */
	if (!kmem_cache_has_cpu_partial(s))
		s->cpu_partial = 0;
	else if (s->size >= PAGE_SIZE)
		s->cpu_partial = 2;
	else if (s->size >= 1024)
		s->cpu_partial = 6;
	else if (s->size >= 256)
		s->cpu_partial = 13;
	else
		s->cpu_partial = 30;
#endif
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Wei Yang
83
100.00%
1
100.00%
Total
83
100.00%
1
100.00%

/*
 * calculate_sizes() determines the order and the distribution of data within
 * a slab object.
 */


static int calculate_sizes(struct kmem_cache *s, int forced_order)
{
	slab_flags_t flags = s->flags;
	unsigned int size = s->object_size;
	unsigned int order;

	/*
         * Round up object size to the next word boundary. We can only
         * place the free pointer at word boundaries and this determines
         * the possible location of the free pointer.
         */
	size = ALIGN(size, sizeof(void *));

#ifdef CONFIG_SLUB_DEBUG
	/*
         * Determine if we can poison the object itself. If the user of
         * the slab may touch the object after free or before allocation
         * then we should never poison the object itself.
         */
	if ((flags & SLAB_POISON) && !(flags & SLAB_TYPESAFE_BY_RCU) &&
			!s->ctor)
		s->flags |= __OBJECT_POISON;
	else
		s->flags &= ~__OBJECT_POISON;


	/*
         * If we are Redzoning then check if there is some space between the
         * end of the object and the free pointer. If not then add an
         * additional word to have some bytes to store Redzone information.
         */
	if ((flags & SLAB_RED_ZONE) && size == s->object_size)
		size += sizeof(void *);
#endif

	/*
         * With that we have determined the number of bytes in actual use
         * by the object. This is the potential offset to the free pointer.
         */
	s->inuse = size;

	if (((flags & (SLAB_TYPESAFE_BY_RCU | SLAB_POISON)) ||
		s->ctor)) {
		/*
                 * Relocate free pointer after the object if it is not
                 * permitted to overwrite the first word of the object on
                 * kmem_cache_free.
                 *
                 * This is the case if we do RCU, have a constructor or
                 * destructor or are poisoning the objects.
                 */
		s->offset = size;
		size += sizeof(void *);
	}

#ifdef CONFIG_SLUB_DEBUG
	if (flags & SLAB_STORE_USER)
		/*
                 * Need to store information about allocs and frees after
                 * the object.
                 */
		size += 2 * sizeof(struct track);
#endif

	kasan_cache_create(s, &size, &s->flags);
#ifdef CONFIG_SLUB_DEBUG
	if (flags & SLAB_RED_ZONE) {
		/*
                 * Add some empty padding so that we can catch
                 * overwrites from earlier objects rather than let
                 * tracking information or the free pointer be
                 * corrupted if a user writes before the start
                 * of the object.
                 */
		size += sizeof(void *);

		s->red_left_pad = sizeof(void *);
		s->red_left_pad = ALIGN(s->red_left_pad, s->align);
		size += s->red_left_pad;
	}
#endif

	/*
         * SLUB stores one object immediately after another beginning from
         * offset 0. In order to align the objects we have to simply size
         * each object to conform to the alignment.
         */
	size = ALIGN(size, s->align);
	s->size = size;
	if (forced_order >= 0)
		order = forced_order;
	else
		order = calculate_order(size, s->reserved);

	if ((int)order < 0)
		return 0;

	s->allocflags = 0;
	if (order)
		s->allocflags |= __GFP_COMP;

	if (s->flags & SLAB_CACHE_DMA)
		s->allocflags |= GFP_DMA;

	if (s->flags & SLAB_RECLAIM_ACCOUNT)
		s->allocflags |= __GFP_RECLAIMABLE;

	/*
         * Determine the number of objects per slab
         */
	s->oo = oo_make(order, size, s->reserved);
	s->min = oo_make(get_order(size), size, s->reserved);
	if (oo_objects(s->oo) > oo_objects(s->max))
		s->max = s->oo;

	return !!oo_objects(s->oo);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
331
81.93%
16
66.67%
JoonSoo Kim
33
8.17%
1
4.17%
Alexander Potapenko
18
4.46%
1
4.17%
Lai Jiangshan
12
2.97%
1
4.17%
Alexey Dobriyan
7
1.73%
3
12.50%
Paul E. McKenney
2
0.50%
1
4.17%
Frederik Schwarzer
1
0.25%
1
4.17%
Total
404
100.00%
24
100.00%



static int kmem_cache_open(struct kmem_cache *s, slab_flags_t flags)
{
	s->flags = kmem_cache_flags(s->size, flags, s->name, s->ctor);
	s->reserved = 0;
#ifdef CONFIG_SLAB_FREELIST_HARDENED
	s->random = get_random_long();
#endif

	if (need_reserve_slab_rcu && (s->flags & SLAB_TYPESAFE_BY_RCU))
		s->reserved = sizeof(struct rcu_head);

	if (!calculate_sizes(s, -1))
		goto error;
	if (disable_higher_order_debug) {
		/*
                 * Disable debugging flags that store metadata if the min slab
                 * order increased.
                 */
		if (get_order(s->size) > get_order(s->object_size)) {
			s->flags &= ~DEBUG_METADATA_FLAGS;
			s->offset = 0;
			if (!calculate_sizes(s, -1))
				goto error;
		}
	}

#if defined(CONFIG_HAVE_CMPXCHG_DOUBLE) && \
    defined(CONFIG_HAVE_ALIGNED_STRUCT_PAGE)
	if (system_has_cmpxchg_double() && (s->flags & SLAB_NO_CMPXCHG) == 0)
		/* Enable fast mode */
		s->flags |= __CMPXCHG_DOUBLE;
#endif

	/*
         * The larger the object size is, the more pages we want on the partial
         * list to avoid pounding the page allocator excessively.
         */
	set_min_partial(s, ilog2(s->size) / 2);

	set_cpu_partial(s);

#ifdef CONFIG_NUMA
	s->remote_node_defrag_ratio = 1000;
#endif

	/* Initialize the pre-computed randomized freelist if slab is up */
	if (slab_state >= UP) {
		if (init_cache_random_seq(s))
			goto error;
	}

	if (!init_kmem_cache_nodes(s))
		goto error;

	if (alloc_kmem_cache_cpus(s))
		return 0;

	free_kmem_cache_nodes(s);
error:
	if (flags & SLAB_PANIC)
		panic("Cannot create slab %s size=%u realsize=%u order=%u offset=%u flags=%lx\n",
		      s->name, s->size, s->size,
		      oo_order(s->oo), s->offset, (unsigned long)flags);
	return -EINVAL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
158
52.84%
15
50.00%
David Rientjes
64
21.40%
3
10.00%
Lai Jiangshan
25
8.36%
2
6.67%
Thomas Garnier
19
6.35%
1
3.33%
Kees Cook
12
4.01%
1
3.33%
Heiko Carstens
12
4.01%
2
6.67%
Alexey Dobriyan
6
2.01%
3
10.00%
Wei Yang
1
0.33%
1
3.33%
Paul E. McKenney
1
0.33%
1
3.33%
Laura Abbott
1
0.33%
1
3.33%
Total
299
100.00%
30
100.00%



static void list_slab_objects(struct kmem_cache *s, struct page *page,
							const char *text)
{
#ifdef CONFIG_SLUB_DEBUG
	void *addr = page_address(page);
	void *p;
	unsigned long *map = kzalloc(BITS_TO_LONGS(page->objects) *
				     sizeof(long), GFP_ATOMIC);
	if (!map)
		return;
	slab_err(s, page, text, s->name);
	slab_lock(page);

	get_map(s, page, map);
	for_each_object(p, s, addr, page->objects) {

		if (!test_bit(slab_index(p, s, addr), map)) {
			pr_err("INFO: Object 0x%p @offset=%tu\n", p, p - addr);
			print_tracking(s, p);
		}
	}
	slab_unlock(page);
	kfree(map);
#endif
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
127
83.01%
3
50.00%
Eric Dumazet
24
15.69%
1
16.67%
Namhyung Kim
1
0.65%
1
16.67%
Fabian Frederick
1
0.65%
1
16.67%
Total
153
100.00%
6
100.00%

/*
 * Attempt to free all partial slabs on a node.
 * This is called from __kmem_cache_shutdown(). We must take list_lock
 * because sysfs file might still access partial list after the shutdowning.
 */


static void free_partial(struct kmem_cache *s, struct kmem_cache_node *n)
{
	LIST_HEAD(discard);
	struct page *page, *h;

	BUG_ON(irqs_disabled());
	spin_lock_irq(&n->list_lock);
	list_for_each_entry_safe(page, h, &n->partial, lru) {
		if (!page->inuse) {
			remove_partial(n, page);
			list_add(&page->lru, &discard);
		} else {
			list_slab_objects(s, page,
			"Objects remaining in %s on __kmem_cache_shutdown()");
		}
	}
	spin_unlock_irq(&n->list_lock);

	list_for_each_entry_safe(page, h, &discard, lru)
		discard_slab(s, page);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
66
55.46%
4
66.67%
Chris Wilson
29
24.37%
1
16.67%
Dmitry Safonov
24
20.17%
1
16.67%
Total
119
100.00%
6
100.00%



bool __kmem_cache_empty(struct kmem_cache *s)
{
	int node;
	struct kmem_cache_node *n;

	for_each_kmem_cache_node(s, node, n)
		if (n->nr_partial || slabs_node(s, node))
			return false;
	return true;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Shakeel Butt
45
100.00%
1
100.00%
Total
45
100.00%
1
100.00%

/*
 * Release all resources used by a slab cache.
 */


int __kmem_cache_shutdown(struct kmem_cache *s)
{
	int node;
	struct kmem_cache_node *n;

	flush_all(s);
	/* Attempt to free all objects */
	for_each_kmem_cache_node(s, node, n) {
		free_partial(s, n);
		if (n->nr_partial || slabs_node(s, node))
			return 1;
	}
	sysfs_slab_remove(s);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
59
90.77%
6
75.00%
Tejun Heo
5
7.69%
1
12.50%
Dmitry Safonov
1
1.54%
1
12.50%
Total
65
100.00%
8
100.00%

/********************************************************************
 *              Kmalloc subsystem
 *******************************************************************/



static int __init setup_slub_min_order(char *str)
{
	get_option(&str, (int *)&slub_min_order);

	return 1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
23
85.19%
1
50.00%
Alexey Dobriyan
4
14.81%
1
50.00%
Total
27
100.00%
2
100.00%

__setup("slub_min_order=", setup_slub_min_order);



static int __init setup_slub_max_order(char *str)
{
	get_option(&str, (int *)&slub_max_order);
	slub_max_order = min(slub_max_order, (unsigned int)MAX_ORDER - 1);

	return 1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
23
54.76%
1
33.33%
David Rientjes
11
26.19%
1
33.33%
Alexey Dobriyan
8
19.05%
1
33.33%
Total
42
100.00%
3
100.00%

__setup("slub_max_order=", setup_slub_max_order);



static int __init setup_slub_min_objects(char *str)
{
	get_option(&str, (int *)&slub_min_objects);

	return 1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
23
85.19%
1
50.00%
Alexey Dobriyan
4
14.81%
1
50.00%
Total
27
100.00%
2
100.00%

__setup("slub_min_objects=", setup_slub_min_objects);



void *__kmalloc(size_t size, gfp_t flags)
{
	struct kmem_cache *s;
	void *ret;

	if (unlikely(size > KMALLOC_MAX_CACHE_SIZE))
		return kmalloc_large(size, flags);

	s = kmalloc_slab(size, flags);

	if (unlikely(ZERO_OR_NULL_PTR(s)))
		return s;

	ret = slab_alloc(s, flags, _RET_IP_);

	trace_kmalloc(_RET_IP_, ret, size, s->size, flags);

	kasan_kmalloc(s, ret, size, flags);

	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
62
62.00%
6
50.00%
Eduard - Gabriel Munteanu
24
24.00%
3
25.00%
Andrey Ryabinin
9
9.00%
1
8.33%
Pekka J Enberg
3
3.00%
1
8.33%
Alexander Potapenko
2
2.00%
1
8.33%
Total
100
100.00%
12
100.00%

EXPORT_SYMBOL(__kmalloc);

#ifdef CONFIG_NUMA


static void *kmalloc_large_node(size_t size, gfp_t flags, int node)
{
	struct page *page;
	void *ptr = NULL;

	flags |= __GFP_COMP;
	page = alloc_pages_node(node, flags, get_order(size));
	if (page)
		ptr = page_address(page);

	kmalloc_large_node_hook(ptr, size, flags);
	return ptr;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
40
58.82%
1
20.00%
Catalin Marinas
18
26.47%
1
20.00%
Vegard Nossum
8
11.76%
1
20.00%
Roman Bobniev
1
1.47%
1
20.00%
Vladimir Davydov
1
1.47%
1
20.00%
Total
68
100.00%
5
100.00%



void *__kmalloc_node(size_t size, gfp_t flags, int node)
{
	struct kmem_cache *s;
	void *ret;

	if (unlikely(size > KMALLOC_MAX_CACHE_SIZE)) {
		ret = kmalloc_large_node(size, flags, node);

		trace_kmalloc_node(_RET_IP_, ret,
				   size, PAGE_SIZE << get_order(size),
				   flags, node);

		return ret;
	}

	s = kmalloc_slab(size, flags);

	if (unlikely(ZERO_OR_NULL_PTR(s)))
		return s;

	ret = slab_alloc_node(s, flags, node, _RET_IP_);

	trace_kmalloc_node(_RET_IP_, ret, size, s->size, flags, node);

	kasan_kmalloc(s, ret, size, flags);

	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
68
50.37%
7
50.00%
Eduard - Gabriel Munteanu
53
39.26%
3
21.43%
Andrey Ryabinin
9
6.67%
1
7.14%
Alexander Potapenko
2
1.48%
1
7.14%
Pekka J Enberg
2
1.48%
1
7.14%
Ezequiel García
1
0.74%
1
7.14%
Total
135
100.00%
14
100.00%

EXPORT_SYMBOL(__kmalloc_node);
#endif

#ifdef CONFIG_HARDENED_USERCOPY
/*
 * Rejects incorrectly sized objects and objects that are to be copied
 * to/from userspace but do not fall entirely within the containing slab
 * cache's usercopy region.
 *
 * Returns NULL if check passes, otherwise const char * to name of cache
 * to indicate an error.
 */


void __check_heap_object(const void *ptr, unsigned long n, struct page *page,
			 bool to_user)
{
	struct kmem_cache *s;
	unsigned int offset;
	size_t object_size;

	/* Find object and usable object size. */
	s = page->slab_cache;

	/* Reject impossible pointers. */
	if (ptr < page_address(page))
		usercopy_abort("SLUB object not in SLUB page?!", NULL,
			       to_user, 0, n);

	/* Find offset within object. */
	offset = (ptr - page_address(page)) % s->size;

	/* Adjust for redzone and reject if within the redzone. */
	if (kmem_cache_debug(s) && s->flags & SLAB_RED_ZONE) {
		if (offset < s->red_left_pad)
			usercopy_abort("SLUB object in left red zone",
				       s->name, to_user, offset, n);
		offset -= s->red_left_pad;
	}

	/* Allow address range falling entirely within usercopy region. */
	if (offset >= s->useroffset &&
	    offset - s->useroffset <= s->usersize &&
	    n <= s->useroffset - offset + s->usersize)
		return;

	/*
         * If the copy is still within the allocated object, produce
         * a warning instead of rejecting the copy. This is intended
         * to be a temporary method to find any missing usercopy
         * whitelists.
         */
	object_size = slab_ksize(s);
	if (usercopy_fallback &&
	    offset <= object_size && n <= object_size - offset) {
		usercopy_warn("SLUB object", s->name, to_user, offset, n);
		return;
	}

	usercopy_abort("SLUB object", s->name, to_user, offset, n);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Kees Cook
211
99.53%
4
80.00%
Alexey Dobriyan
1
0.47%
1
20.00%
Total
212
100.00%
5
100.00%

#endif /* CONFIG_HARDENED_USERCOPY */



static size_t __ksize(const void *object)
{
	struct page *page;

	if (unlikely(object == ZERO_SIZE_PTR))
		return 0;

	page = virt_to_head_page(object);

	if (unlikely(!PageSlab(page))) {
		WARN_ON(!PageCompound(page));
		return PAGE_SIZE << compound_order(page);
	}

	return slab_ksize(page->slab_cache);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
32
43.84%
3
33.33%
Vegard Nossum
20
27.40%
1
11.11%
Pekka J Enberg
11
15.07%
1
11.11%
Eric Dumazet
4
5.48%
1
11.11%
Satyam Sharma
3
4.11%
1
11.11%
Andrey Ryabinin
2
2.74%
1
11.11%
Glauber de Oliveira Costa
1
1.37%
1
11.11%
Total
73
100.00%
9
100.00%



size_t ksize(const void *object)
{
	size_t size = __ksize(object);
	/* We assume that ksize callers could use whole allocated area,
         * so we need to unpoison this area.
         */
	kasan_unpoison_shadow(object, size);
	return size;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrey Ryabinin
27
93.10%
1
50.00%
Alexander Potapenko
2
6.90%
1
50.00%
Total
29
100.00%
2
100.00%

EXPORT_SYMBOL(ksize);



void kfree(const void *x)
{
	struct page *page;
	void *object = (void *)x;

	trace_kfree(_RET_IP_, x);

	if (unlikely(ZERO_OR_NULL_PTR(x)))
		return;

	page = virt_to_head_page(x);
	if (unlikely(!PageSlab(page))) {
		BUG_ON(!PageCompound(page));
		kfree_hook(object);
		__free_pages(page, compound_order(page));
		return;
	}
	slab_free(page->slab_cache, page, object, NULL, 1, _RET_IP_);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
81
77.14%
7
41.18%
Pekka J Enberg
7
6.67%
1
5.88%
Jesper Dangaard Brouer
4
3.81%
1
5.88%
Satyam Sharma
3
2.86%
1
5.88%
Catalin Marinas
3
2.86%
1
5.88%
Glauber de Oliveira Costa
3
2.86%
2
11.76%
Roman Bobniev
1
0.95%
1
5.88%
Dmitriy Vyukov
1
0.95%
1
5.88%
Vladimir Davydov
1
0.95%
1
5.88%
Eduard - Gabriel Munteanu
1
0.95%
1
5.88%
Total
105
100.00%
17
100.00%

EXPORT_SYMBOL(kfree);


#define SHRINK_PROMOTE_MAX 32

/*
 * kmem_cache_shrink discards empty slabs and promotes the slabs filled
 * up most to the head of the partial lists. New allocations will then
 * fill those up and thus they can be removed from the partial lists.
 *
 * The slabs with the least items are placed last. This results in them
 * being allocated from last increasing the chance that the last objects
 * are freed in them.
 */


int __kmem_cache_shrink(struct kmem_cache *s)
{
	int node;
	int i;
	struct kmem_cache_node *n;
	struct page *page;
	struct page *t;
	struct list_head discard;
	struct list_head promote[SHRINK_PROMOTE_MAX];
	unsigned long flags;
	int ret = 0;

	flush_all(s);
	for_each_kmem_cache_node(s, node, n) {
		INIT_LIST_HEAD(&discard);
		for (i = 0; i < SHRINK_PROMOTE_MAX; i++)
			INIT_LIST_HEAD(promote + i);

		spin_lock_irqsave(&n->list_lock, flags);

		/*
                 * Build lists of slabs to discard or promote.
                 *
                 * Note that concurrent frees may occur while we hold the
                 * list_lock. page->inuse here is the upper limit.
                 */
		list_for_each_entry_safe(page, t, &n->partial, lru) {
			int free = page->objects - page->inuse;

			/* Do not reread page->inuse */
			barrier();

			/* We do not keep full slabs on the list */
			BUG_ON(free <= 0);

			if (free == page->objects) {
				list_move(&page->lru, &discard);
				n->nr_partial--;
			} else if (free <= SHRINK_PROMOTE_MAX)
				list_move(&page->lru, promote + free - 1);
		}

		/*
                 * Promote the slabs filled up most to the head of the
                 * partial list.
                 */
		for (i = SHRINK_PROMOTE_MAX - 1; i >= 0; i--)
			list_splice(promote + i, &n->partial);

		spin_unlock_irqrestore(&n->list_lock, flags);

		/* Release empty slabs */
		list_for_each_entry_safe(page, t, &discard, lru)
			discard_slab(s, page);

		if (slabs_node(s, node))
			ret = 1;
	}

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
162
63.04%
4
57.14%
Vladimir Davydov
95
36.96%
3
42.86%
Total
257
100.00%
7
100.00%

#ifdef CONFIG_MEMCG


static void kmemcg_cache_deact_after_rcu(struct kmem_cache *s)
{
	/*
         * Called with all the locks held after a sched RCU grace period.
         * Even if @s becomes empty after shrinking, we can't know that @s
         * doesn't have allocations already in-flight and thus can't
         * destroy @s until the associated memcg is released.
         *
         * However, let's remove the sysfs files for empty caches here.
         * Each cache has a lot of interface files which aren't
         * particularly useful for empty draining caches; otherwise, we can
         * easily end up with millions of unnecessary sysfs files on
         * systems which have a lot of memory and transient cgroups.
         */
	if (!__kmem_cache_shrink(s))
		sysfs_slab_remove(s);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Tejun Heo
25
100.00%
2
100.00%
Total
25
100.00%
2
100.00%



void __kmemcg_cache_deactivate(struct kmem_cache *s)
{
	/*
         * Disable empty slabs caching. Used to avoid pinning offline
         * memory cgroups by kmem pages that can be freed.
         */
	slub_set_cpu_partial(s, 0);
	s->min_partial = 0;

	/*
         * s->cpu_partial is checked locklessly (see put_cpu_partial), so
         * we have to make sure the change is visible before shrinking.
         */
	slab_deactivate_memcg_cache_rcu_sched(s, kmemcg_cache_deact_after_rcu);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Tejun Heo
28
87.50%
2
66.67%
Wei Yang
4
12.50%
1
33.33%
Total
32
100.00%
3
100.00%

#endif



static int slab_mem_going_offline_callback(void *arg)
{
	struct kmem_cache *s;

	mutex_lock(&slab_mutex);
	list_for_each_entry(s, &slab_caches, list)
		__kmem_cache_shrink(s);
	mutex_unlock(&slab_mutex);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Yasunori Goto
38
88.37%
1
33.33%
Christoph Lameter
4
9.30%
1
33.33%
Vladimir Davydov
1
2.33%
1
33.33%
Total
43
100.00%
3
100.00%



static void slab_mem_offline_callback(void *arg)
{
	struct kmem_cache_node *n;
	struct kmem_cache *s;
	struct memory_notify *marg = arg;
	int offline_node;

	offline_node = marg->status_change_nid_normal;

	/*
         * If the node still has available memory. we need kmem_cache_node
         * for it yet.
         */
	if (offline_node < 0)
		return;

	mutex_lock(&slab_mutex);
	list_for_each_entry(s, &slab_caches, list) {
		n = get_node(s, offline_node);
		if (n) {
			/*
                         * if n->nr_slabs > 0, slabs still exist on the node
                         * that is going down. We were unable to free them,
                         * and offline_pages() function shouldn't call this
                         * callback. So, we must fail.
                         */
			BUG_ON(slabs_node(s, offline_node));

			s->node[offline_node] = NULL;
			kmem_cache_free(kmem_cache_node, n);
		}
	}
	mutex_unlock(&slab_mutex);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Yasunori Goto
97
89.81%
1
16.67%
Christoph Lameter
9
8.33%
3
50.00%
Adam Buchbinder
1
0.93%
1
16.67%
Lai Jiangshan
1
0.93%
1
16.67%
Total
108
100.00%
6
100.00%



static int slab_mem_going_online_callback(void *arg)
{
	struct kmem_cache_node *n;
	struct kmem_cache *s;
	struct memory_notify *marg = arg;
	int nid = marg->status_change_nid_normal;
	int ret = 0;

	/*
         * If the node's memory is already available, then kmem_cache_node is
         * already created. Nothing to do.
         */
	if (nid < 0)
		return 0;

	/*
         * We are bringing a node online. No memory is available yet. We must
         * allocate a kmem_cache_node structure in order to bring the node
         * online.
         */
	mutex_lock(&slab_mutex);
	list_for_each_entry(s, &slab_caches, list) {
		/*
                 * XXX: kmem_cache_alloc_node will fallback to other nodes
                 *      since memory is not yet available from the node that
                 *      is brought up.
                 */
		n = kmem_cache_alloc(kmem_cache_node, GFP_KERNEL);
		if (!n) {
			ret = -ENOMEM;
			goto out;
		}
		init_kmem_cache_node(n);
		s->node[nid] = n;
	}
out:
	mutex_unlock(&slab_mutex);
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Yasunori Goto
109
93.97%
1
20.00%
Christoph Lameter
6
5.17%
3
60.00%
Lai Jiangshan
1
0.86%
1
20.00%
Total
116
100.00%
5
100.00%



static int slab_memory_callback(struct notifier_block *self,
				unsigned long action, void *arg)
{
	int ret = 0;

	switch (action) {
	case MEM_GOING_ONLINE:
		ret = slab_mem_going_online_callback(arg);
		break;
	case MEM_GOING_OFFLINE:
		ret = slab_mem_going_offline_callback(arg);
		break;
	case MEM_OFFLINE:
	case MEM_CANCEL_ONLINE:
		slab_mem_offline_callback(arg);
		break;
	case MEM_ONLINE:
	case MEM_CANCEL_OFFLINE:
		break;
	}
	if (ret)
		ret = notifier_from_errno(ret);
	else
		ret = NOTIFY_OK;
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Yasunori Goto
81
90.00%
1
50.00%
Kamezawa Hiroyuki
9
10.00%
1
50.00%
Total
90
100.00%
2
100.00%


static struct notifier_block slab_memory_callback_nb = {
	.notifier_call = slab_memory_callback,
	.priority = SLAB_CALLBACK_PRI,
};

/********************************************************************
 *                      Basic setup of slabs
 *******************************************************************/

/*
 * Used for early kmem_cache structures that were allocated using
 * the page allocator. Allocate them properly then fix up the pointers
 * that may be pointing to the wrong kmem_cache structure.
 */



static struct kmem_cache * __init bootstrap(struct kmem_cache *static_cache)
{
	int node;
	struct kmem_cache *s = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT);
	struct kmem_cache_node *n;

	memcpy(s, static_cache, kmem_cache->object_size);

	/*
         * This runs very early, and only the boot processor is supposed to be
         * up.  Even if it weren't true, IRQs are not up so we couldn't fire
         * IPIs around.
         */
	__flush_cpu_slab(s, smp_processor_id());
	for_each_kmem_cache_node(s, node, n) {
		struct page *p;

		list_for_each_entry(p, &n->partial, lru)
			p->slab_cache = s;

#ifdef CONFIG_SLUB_DEBUG
		list_for_each_entry(p, &n->full, lru)
			p->slab_cache = s;
#endif
	}
	slab_init_memcg_params(s);
	list_add(&s->list, &slab_caches);
	memcg_link_cache(s);
	return s;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
101
80.16%
6
50.00%
Glauber de Oliveira Costa
11
8.73%
2
16.67%
Vladimir Davydov
5
3.97%
1
8.33%
Tejun Heo
5
3.97%
1
8.33%
Yasunori Goto
3
2.38%
1
8.33%
Li Zefan
1
0.79%
1
8.33%
Total
126
100.00%
12
100.00%



void __init kmem_cache_init(void)
{
	static __initdata struct kmem_cache boot_kmem_cache,
		boot_kmem_cache_node;

	if (debug_guardpage_minorder())
		slub_max_order = 0;

	kmem_cache_node = &boot_kmem_cache_node;
	kmem_cache = &boot_kmem_cache;

	create_boot_cache(kmem_cache_node, "kmem_cache_node",
		sizeof(struct kmem_cache_node), SLAB_HWCACHE_ALIGN, 0, 0);

	register_hotmemory_notifier(&slab_memory_callback_nb);

	/* Able to allocate the per node structures */
	slab_state = PARTIAL;

	create_boot_cache(kmem_cache, "kmem_cache",
			offsetof(struct kmem_cache, node) +
				nr_node_ids * sizeof(struct kmem_cache_node *),
		       SLAB_HWCACHE_ALIGN, 0, 0);

	kmem_cache = bootstrap(&boot_kmem_cache);

	/*
         * Allocate kmem_cache_node properly from the kmem_cache slab.
         * kmem_cache_node is separately allocated so no need to
         * update any list pointers.
         */
	kmem_cache_node = bootstrap(&boot_kmem_cache_node);

	/* Now we can use the kmem_cache to allocate kmalloc slabs */
	setup_kmalloc_cache_index_table();
	create_kmalloc_caches(0);

	/* Setup random freelists for each cache */
	init_freelist_randomization();

	cpuhp_setup_state_nocalls(CPUHP_SLUB_DEAD, "slub:dead", NULL,
				  slub_cpu_dead);

	pr_info("SLUB: HWalign=%d, Order=%u-%u, MinObjects=%u, CPUs=%u, Nodes=%d\n",
		cache_line_size(),
		slub_min_order, slub_max_order, slub_min_objects,
		nr_cpu_ids, nr_node_ids);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
117
75.97%
6
42.86%
Stanislaw Gruszka
9
5.84%
1
7.14%
Sebastian Andrzej Siewior
8
5.19%
1
7.14%
David Windsor
8
5.19%
1
7.14%
Thomas Garnier
4
2.60%
1
7.14%
Daniel Sanders
3
1.95%
1
7.14%
Andrew Morton
3
1.95%
1
7.14%
Alexey Dobriyan
1
0.65%
1
7.14%
Fabian Frederick
1
0.65%
1
7.14%
Total
154
100.00%
14
100.00%



void __init kmem_cache_init_late(void)
{
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Pekka J Enberg
6
85.71%
1
50.00%
Benjamin Herrenschmidt
1
14.29%
1
50.00%
Total
7
100.00%
2
100.00%


struct kmem_cache *

__kmem_cache_alias(const char *name, unsigned int size, unsigned int align,
		   slab_flags_t flags, void (*ctor)(void *))
{
	struct kmem_cache *s, *c;

	s = find_mergeable(size, align, flags, name, ctor);
	if (s) {
		s->refcount++;

		/*
                 * Adjust the object sizes so that we clear
                 * the complete object on kzalloc.
                 */
		s->object_size = max(s->object_size, size);
		s->inuse = max(s->inuse, ALIGN(size, sizeof(void *)));

		for_each_memcg_cache(c, s) {
			c->object_size = s->object_size;
			c->inuse = max(c->inuse, ALIGN(size, sizeof(void *)));
		}

		if (sysfs_slab_alias(s, name)) {
			s->refcount--;
			s = NULL;
		}
	}

	return s;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
111
67.68%
8
57.14%
Vladimir Davydov
40
24.39%
2
14.29%
Alexey Dobriyan
7
4.27%
3
21.43%
David Rientjes
6
3.66%
1
7.14%
Total
164
100.00%
14
100.00%



int __kmem_cache_create(struct kmem_cache *s, slab_flags_t flags)
{
	int err;

	err = kmem_cache_open(s, flags);
	if (err)
		return err;

	/* Mutex is not taken during early boot */
	if (slab_state <= UP)
		return 0;

	memcg_propagate_slab_attrs(s);
	err = sysfs_slab_add(s);
	if (err)
		__kmem_cache_release(s);

	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
42
63.64%
6
50.00%
Pekka J Enberg
14
21.21%
2
16.67%
Glauber de Oliveira Costa
5
7.58%
1
8.33%
David Rientjes
3
4.55%
1
8.33%
Alexey Dobriyan
1
1.52%
1
8.33%
Dmitry Safonov
1
1.52%
1
8.33%
Total
66
100.00%
12
100.00%



void *__kmalloc_track_caller(size_t size, gfp_t gfpflags, unsigned long caller)
{
	struct kmem_cache *s;
	void *ret;

	if (unlikely(size > KMALLOC_MAX_CACHE_SIZE))
		return kmalloc_large(size, gfpflags);

	s = kmalloc_slab(size, gfpflags);

	if (unlikely(ZERO_OR_NULL_PTR(s)))
		return s;

	ret = slab_alloc(s, gfpflags, caller);

	/* Honor the call site pointer we received. */
	trace_kmalloc(caller, ret, size, s->size, gfpflags);

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
61
64.89%
6
50.00%
Eduard - Gabriel Munteanu
26
27.66%
3
25.00%
Satyam Sharma
3
3.19%
1
8.33%
Pekka J Enberg
3
3.19%
1
8.33%
Lucas De Marchi
1
1.06%
1
8.33%
Total
94
100.00%
12
100.00%

#ifdef CONFIG_NUMA


void *__kmalloc_node_track_caller(size_t size, gfp_t gfpflags,
					int node, unsigned long caller)
{
	struct kmem_cache *s;
	void *ret;

	if (unlikely(size > KMALLOC_MAX_CACHE_SIZE)) {
		ret = kmalloc_large_node(size, gfpflags, node);

		trace_kmalloc_node(caller, ret,
				   size, PAGE_SIZE << get_order(size),
				   gfpflags, node);

		return ret;
	}

	s = kmalloc_slab(size, gfpflags);

	if (unlikely(ZERO_OR_NULL_PTR(s)))
		return s;

	ret = slab_alloc_node(s, gfpflags, node, caller);

	/* Honor the call site pointer we received. */
	trace_kmalloc_node(caller, ret, size, s->size, gfpflags, node);

	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
67
51.94%
7
46.67%
Eduard - Gabriel Munteanu
28
21.71%
3
20.00%
Xiaotian Feng
27
20.93%
1
6.67%
Satyam Sharma
3
2.33%
1
6.67%
Pekka J Enberg
2
1.55%
1
6.67%
Ezequiel García
1
0.78%
1
6.67%
Lucas De Marchi
1
0.78%
1
6.67%
Total
129
100.00%
15
100.00%

#endif

#ifdef CONFIG_SYSFS


static int count_inuse(struct page *page)
{
	return page->inuse;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
16
100.00%
1
100.00%
Total
16
100.00%
1
100.00%



static int count_total(struct page *page)
{
	return page->objects;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
16
100.00%
1
100.00%
Total
16
100.00%
1
100.00%

#endif

#ifdef CONFIG_SLUB_DEBUG


static int validate_slab(struct kmem_cache *s, struct page *page,
						unsigned long *map)
{
	void *p;
	void *addr = page_address(page);

	if (!check_slab(s, page) ||
			!on_freelist(s, page, NULL))
		return 0;

	/* Now we know that a valid freelist exists */
	bitmap_zero(map, page->objects);

	get_map(s, page, map);
	for_each_object(p, s, addr, page->objects) {
		if (test_bit(slab_index(p, s, addr), map))
			if (!check_object(s, page, p, SLUB_RED_INACTIVE))
				return 0;
	}

	for_each_object(p, s, addr, page->objects)
		if (!test_bit(slab_index(p, s, addr), map))
			if (!check_object(s, page, p, SLUB_RED_ACTIVE))
				return 0;
	return 1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
166
98.81%
7
87.50%
Tero Roponen
2
1.19%
1
12.50%
Total
168
100.00%
8
100.00%



static void validate_slab_slab(struct kmem_cache *s, struct page *page,
						unsigned long *map)
{
	slab_lock(page);
	validate_slab(s, page, map);
	slab_unlock(page);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
40
100.00%
4
100.00%
Total
40
100.00%
4
100.00%



static int validate_slab_node(struct kmem_cache *s,
		struct kmem_cache_node *n, unsigned long *map)
{
	unsigned long count = 0;
	struct page *page;
	unsigned long flags;

	spin_lock_irqsave(&n->list_lock, flags);

	list_for_each_entry(page, &n->partial, lru) {
		validate_slab_slab(s, page, map);
		count++;
	}
	if (count != n->nr_partial)
		pr_err("SLUB %s: %ld partial slabs counted but counter=%ld\n",
		       s->name, count, n->nr_partial);

	if (!(s->flags & SLAB_STORE_USER))
		goto out;

	list_for_each_entry(page, &n->full, lru) {
		validate_slab_slab(s, page, map);
		count++;
	}
	if (count != atomic_long_read(&n->nr_slabs))
		pr_err("SLUB: %s %ld slabs counted but counter=%ld\n",
		       s->name, count, atomic_long_read(&n->nr_slabs));

out:
	spin_unlock_irqrestore(&n->list_lock, flags);
	return count;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
169
97.69%
5
83.33%
Fabian Frederick
4
2.31%
1
16.67%
Total
173
100.00%
6
100.00%



static long validate_slab_cache(struct kmem_cache *s)
{
	int node;
	unsigned long count = 0;
	unsigned long *map = kmalloc(BITS_TO_LONGS(oo_objects(s->max)) *
				sizeof(unsigned long), GFP_KERNEL);
	struct kmem_cache_node *n;

	if (!map)
		return -ENOMEM;

	flush_all(s);
	for_each_kmem_cache_node(s, node, n)
		count += validate_slab_node(s, n, map);
	kfree(map);
	return count;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
92
100.00%
9
100.00%
Total
92
100.00%
9
100.00%

/*
 * Generate lists of code addresses where slabcache objects are allocated
 * and freed.
 */


struct location {
	
unsigned long count;
	
unsigned long addr;
	
long long sum_time;
	
long min_time;
	
long max_time;
	
long min_pid;
	
long max_pid;
	DECLARE_BITMAP(cpus, NR_CPUS);
	
nodemask_t nodes;
};


struct loc_track {
	
unsigned long max;
	
unsigned long count;
	
struct location *loc;
};



static void free_loc_track(struct loc_track *t)
{
	if (t->max)
		free_pages((unsigned long)t->loc,
			get_order(sizeof(struct location) * t->max));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
41
100.00%
1
100.00%
Total
41
100.00%
1
100.00%



static int alloc_loc_track(struct loc_track *t, unsigned long max, gfp_t flags)
{
	struct location *l;
	int order;

	order = get_order(sizeof(struct location) * max);

	l = (void *)__get_free_pages(flags, order);
	if (!l)
		return 0;

	if (t->count) {
		memcpy(l, t->loc, sizeof(struct location) * t->count);
		free_loc_track(t);
	}
	t->max = max;
	t->loc = l;
	return 1;
}

Contributors
Person
Tokens
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Commits
CommitProp
Christoph Lameter
107
100.00%
2
100.00%
Total
107
100.00%
2
100.00%



static int add_location(struct loc_track *t, struct kmem_cache *s,
				const struct track *track)
{
	long start, end, pos;
	struct location *l;
	unsigned long caddr;
	unsigned long age = jiffies - track->when;

	start = -1;
	end = t->count;

	for ( ; ; ) {
		pos = start + (end - start + 1) / 2;

		/*
                 * There is nothing at "end". If we end up there
                 * we need to add something to before end.
                 */
		if (pos == end)
			break;

		caddr = t->loc[pos].addr;
		if (track->addr == caddr) {

			l = &t->loc[pos];
			l->count++;
			if (track->when) {
				l->sum_time += age;
				if (age < l->min_time)
					l->min_time = age;
				if (age > l->max_time)
					l->max_time = age;

				if (track->pid < l->min_pid)
					l->min_pid = track->pid;
				if (track->pid > l->max_pid)
					l->max_pid = track->pid;

				cpumask_set_cpu(track->cpu,
						to_cpumask(l->cpus));
			}
			node_set(page_to_nid(virt_to_page(track)), l->nodes);
			return 1;
		}

		if (track->addr < caddr)
			end = pos;
		else
			start = pos;
	}

	/*
         * Not found. Insert new tracking element.
         */
	if (t->count >= t->max && !alloc_loc_track(t, 2 * t->max, GFP_ATOMIC))
		return 0;

	l = t->loc + pos;
	if (pos < t->count)
		memmove(l + 1, l,
			(t->count - pos) * sizeof(struct location));
	t->count++;
	l->count = 1;
	l->addr = track->addr;
	l->sum_time = age;
	l->min_time = age;
	l->max_time = age;
	l->min_pid = track->pid;
	l->max_pid = track->pid;
	cpumask_clear(to_cpumask(l->cpus));
	cpumask_set_cpu(track->cpu, to_cpumask(l->cpus));
	nodes_clear(l->nodes);
	node_set(page_to_nid(virt_to_page(track)), l->nodes);
	return 1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
406
96.67%
4
66.67%
Rusty Russell
12
2.86%
1
16.67%
Eduard - Gabriel Munteanu
2
0.48%
1
16.67%
Total
420
100.00%
6
100.00%



static void process_slab(struct loc_track *t, struct kmem_cache *s,
		struct page *page, enum track_item alloc,
		unsigned long *map)
{
	void *addr = page_address(page);
	void *p;

	bitmap_zero(map, page->objects);
	get_map(s, page, map);

	for_each_object(p, s, addr, page->objects)
		if (!test_bit(slab_index(p, s, addr), map))
			add_location(t, s, get_track(s, p, alloc));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
99
95.19%
7
77.78%
Eric Dumazet
4
3.85%
1
11.11%
Namhyung Kim
1
0.96%
1
11.11%
Total
104
100.00%
9
100.00%



static int list_locations(struct kmem_cache *s, char *buf,
					enum track_item alloc)
{
	int len = 0;
	unsigned long i;
	struct loc_track t = { 0, 0, NULL };
	int node;
	unsigned long *map = kmalloc(BITS_TO_LONGS(oo_objects(s->max)) *
				     sizeof(unsigned long), GFP_KERNEL);
	struct kmem_cache_node *n;

	if (!map || !alloc_loc_track(&t, PAGE_SIZE / sizeof(struct location),
				     GFP_KERNEL)) {
		kfree(map);
		return sprintf(buf, "Out of memory\n");
	}
	/* Push back cpu slabs */
	flush_all(s);

	for_each_kmem_cache_node(s, node, n) {
		unsigned long flags;
		struct page *page;

		if (!atomic_long_read(&n->nr_slabs))
			continue;

		spin_lock_irqsave(&n->list_lock, flags);
		list_for_each_entry(page, &n->partial, lru)
			process_slab(&t, s, page, alloc, map);
		list_for_each_entry(page, &n->full, lru)
			process_slab(&t, s, page, alloc, map);
		spin_unlock_irqrestore(&n->list_lock, flags);
	}

	for (i = 0; i < t.count; i++) {
		struct location *l = &t.loc[i];

		if (len > PAGE_SIZE - KSYM_SYMBOL_LEN - 100)
			break;
		len += sprintf(buf + len, "%7ld ", l->count);

		if (l->addr)
			len += sprintf(buf + len, "%pS", (void *)l->addr);
		else
			len += sprintf(buf + len, "<not-available>");

		if (l->sum_time != l->min_time) {
			len += sprintf(buf + len, " age=%ld/%ld/%ld",
				l->min_time,
				(long)div_u64(l->sum_time, l->count),
				l->max_time);
		} else
			len += sprintf(buf + len, " age=%ld",
				l->min_time);

		if (l->min_pid != l->max_pid)
			len += sprintf(buf + len, " pid=%ld-%ld",
				l->min_pid, l->max_pid);
		else
			len += sprintf(buf + len, " pid=%ld",
				l->min_pid);

		if (num_online_cpus() > 1 &&
				!cpumask_empty(to_cpumask(l->cpus)) &&
				len < PAGE_SIZE - 60)
			len += scnprintf(buf + len, PAGE_SIZE - len - 50,
					 " cpus=%*pbl",
					 cpumask_pr_args(to_cpumask(l->cpus)));

		if (nr_online_nodes > 1 && !nodes_empty(l->nodes) &&
				len < PAGE_SIZE - 60)
			len += scnprintf(buf + len, PAGE_SIZE - len - 50,
					 " nodes=%*pbl",
					 nodemask_pr_args(&l->nodes));

		len += sprintf(buf + len, "\n");
	}

	free_loc_track(&t);
	kfree(map);
	if (!t.count)
		len += sprintf(buf, "No data\n");
	return len;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
483
88.14%
7
58.33%
Eric Dumazet
40
7.30%
1
8.33%
Tejun Heo
13
2.37%
1
8.33%
Harvey Harrison
6
1.09%
1
8.33%
Joe Perches
5
0.91%
1
8.33%
Michal Hocko
1
0.18%
1
8.33%
Total
548
100.00%
12
100.00%

#endif

#ifdef SLUB_RESILIENCY_TEST


static void __init resiliency_test(void)
{
	u8 *p;

	BUILD_BUG_ON(KMALLOC_MIN_SIZE > 16 || KMALLOC_SHIFT_HIGH < 10);

	pr_err("SLUB resiliency testing\n");
	pr_err("-----------------------\n");
	pr_err("A. Corruption after allocation\n");

	p = kzalloc(16, GFP_KERNEL);
	p[16] = 0x12;
	pr_err("\n1. kmalloc-16: Clobber Redzone/next pointer 0x12->0x%p\n\n",
	       p + 16);

	validate_slab_cache(kmalloc_caches[4]);

	/* Hmmm... The next two are dangerous */
	p = kzalloc(32, GFP_KERNEL);
	p[32 + sizeof(void *)] = 0x34;
	pr_err("\n2. kmalloc-32: Clobber next pointer/next slab 0x34 -> -0x%p\n",
	       p);
	pr_err("If allocated object is overwritten then not detectable\n\n");

	validate_slab_cache(kmalloc_caches[5]);
	p = kzalloc(64, GFP_KERNEL);
	p += 64 + (get_cycles() & 0xff) * sizeof(void *);
	*p = 0x56;
	pr_err("\n3. kmalloc-64: corrupting random byte 0x56->0x%p\n",
	       p);
	pr_err("If allocated object is overwritten then not detectable\n\n");
	validate_slab_cache(kmalloc_caches[6]);

	pr_err("\nB. Corruption after free\n");
	p = kzalloc(128, GFP_KERNEL);
	kfree(p);
	*p = 0x78;
	pr_err("1. kmalloc-128: Clobber first word 0x78->0x%p\n\n", p);
	validate_slab_cache(kmalloc_caches[7]);

	p = kzalloc(256, GFP_KERNEL);
	kfree(p);
	p[50] = 0x9a;
	pr_err("\n2. kmalloc-256: Clobber 50th byte 0x9a->0x%p\n\n", p);
	validate_slab_cache(kmalloc_caches[8]);

	p = kzalloc(512, GFP_KERNEL);
	kfree(p);
	p[512] = 0xab;
	pr_err("\n3. kmalloc-512: Clobber redzone 0xab->0x%p\n\n", p);
	validate_slab_cache(kmalloc_caches[9]);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
255
92.06%
4
50.00%
Fabian Frederick
14
5.05%
1
12.50%
Eric Dumazet
4
1.44%
1
12.50%
Rusty Russell
3
1.08%
1
12.50%
David Rientjes
1
0.36%
1
12.50%
Total
277
100.00%
8
100.00%

#else
#ifdef CONFIG_SYSFS


static void resiliency_test(void) {}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
7
100.00%
1
100.00%
Total
7
100.00%
1
100.00%


;
#endif
#endif

#ifdef CONFIG_SYSFS

enum slab_stat_type {
	
SL_ALL,			/* All slabs */
	
SL_PARTIAL,		/* Only partially allocated slabs */
	
SL_CPU,			/* Only slabs used for cpu caches */
	
SL_OBJECTS,		/* Determine allocated objects not slabs */
	
SL_TOTAL		/* Determine object capacity not slabs */
};


#define SO_ALL		(1 << SL_ALL)

#define SO_PARTIAL	(1 << SL_PARTIAL)

#define SO_CPU		(1 << SL_CPU)

#define SO_OBJECTS	(1 << SL_OBJECTS)

#define SO_TOTAL	(1 << SL_TOTAL)

#ifdef CONFIG_MEMCG
static bool memcg_sysfs_enabled = IS_ENABLED(CONFIG_SLUB_MEMCG_SYSFS_ON);



static int __init setup_slub_memcg_sysfs(char *str)
{
	int v;

	if (get_option(&str, &v) > 0)
		memcg_sysfs_enabled = v;

	return 1;
}

Contributors
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Tokens
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CommitProp
Tejun Heo
34
100.00%
1
100.00%
Total
34
100.00%
1
100.00%

__setup("slub_memcg_sysfs=", setup_slub_memcg_sysfs);
#endif



static ssize_t show_slab_objects(struct kmem_cache *s,
			    char *buf, unsigned long flags)
{
	unsigned long total = 0;
	int node;
	int x;
	unsigned long *nodes;

	nodes = kzalloc(sizeof(unsigned long) * nr_node_ids, GFP_KERNEL);
	if (!nodes)
		return -ENOMEM;

	if (flags & SO_CPU) {
		int cpu;

		for_each_possible_cpu(cpu) {
			struct kmem_cache_cpu *c = per_cpu_ptr(s->cpu_slab,
							       cpu);
			int node;
			struct page *page;

			page = READ_ONCE(c->page);
			if (!page)
				continue;

			node = page_to_nid(page);
			if (flags & SO_TOTAL)
				x = page->objects;
			else if (flags & SO_OBJECTS)
				x = page->inuse;
			else
				x = 1;

			total += x;
			nodes[node] += x;

			page = slub_percpu_partial_read_once(c);
			if (page) {
				node = page_to_nid(page);
				if (flags & SO_TOTAL)
					WARN_ON_ONCE(1);
				else if (flags & SO_OBJECTS)
					WARN_ON_ONCE(1);
				else
					x = page->pages;
				total += x;
				nodes[node] += x;
			}
		}
	}

	get_online_mems();
#ifdef CONFIG_SLUB_DEBUG
	if (flags & SO_ALL) {
		struct kmem_cache_node *n;

		for_each_kmem_cache_node(s, node, n) {

			if (flags & SO_TOTAL)
				x = atomic_long_read(&n->total_objects);
			else if (flags & SO_OBJECTS)
				x = atomic_long_read(&n->total_objects) -
					count_partial(n, count_free);
			else
				x = atomic_long_read(&n->nr_slabs);
			total += x;
			nodes[node] += x;
		}

	} else
#endif
	if (flags & SO_PARTIAL) {
		struct kmem_cache_node *n;

		for_each_kmem_cache_node(s, node, n) {
			if (flags & SO_TOTAL)
				x = count_partial(n, count_total);
			else if (flags & SO_OBJECTS)
				x = count_partial(n, count_inuse);
			else
				x = n->nr_partial;
			total += x;
			nodes[node] += x;
		}
	}
	x = sprintf(buf, "%lu", total);
#ifdef CONFIG_NUMA
	for (node = 0; node < nr_node_ids; node++)
		if (nodes[node])
			x += sprintf(buf + x, " N%d=%lu",
					node, nodes[node]);
#endif
	put_online_mems();
	kfree(nodes);
	return x + sprintf(buf + x, "\n");
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
405
87.47%
12
63.16%
Li Zefan
32
6.91%
1
5.26%
Eric Dumazet
11
2.38%
1
5.26%
Cyrill V. Gorcunov
10
2.16%
1
5.26%
Vladimir Davydov
2
0.43%
1
5.26%
Pavel Emelyanov
1
0.22%
1
5.26%
Wei Yang
1
0.22%
1
5.26%
Jason Low
1
0.22%
1
5.26%
Total
463
100.00%
19
100.00%

#ifdef CONFIG_SLUB_DEBUG


static int any_slab_objects(struct kmem_cache *s)
{
	int node;
	struct kmem_cache_node *n;

	for_each_kmem_cache_node(s, node, n)
		if (atomic_long_read(&n->total_objects))
			return 1;

	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
42
97.67%
4
80.00%
Benjamin Herrenschmidt
1
2.33%
1
20.00%
Total
43
100.00%
5
100.00%

#endif


#define to_slab_attr(n) container_of(n, struct slab_attribute, attr)

#define to_slab(n) container_of(n, struct kmem_cache, kobj)


struct slab_attribute {
	
struct attribute attr;
	
ssize_t (*show)(struct kmem_cache *s, char *buf);
	
ssize_t (*store)(struct kmem_cache *s, const char *x, size_t count);
};


#define SLAB_ATTR_RO(_name) \
	static struct slab_attribute _name##_attr = \
        __ATTR(_name, 0400, _name##_show, NULL)


#define SLAB_ATTR(_name) \
	static struct slab_attribute _name##_attr =  \
        __ATTR(_name, 0600, _name##_show, _name##_store)



static ssize_t slab_size_show(struct kmem_cache *s, char *buf)
{
	return sprintf(buf, "%u\n", s->size);
}
Contributors
Person
Tokens
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Commits
CommitProp
Christoph Lameter
26
96.30%
1
50.00%
Alexey Dobriyan
1
3.70%
1
50.00%
Total
27
100.00%
2
100.00%

SLAB_ATTR_RO(slab_size);



static ssize_t align_show(struct kmem_cache *s, char *buf)
{
	return sprintf(buf, "%u\n", s->align);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
26
96.30%
1
50.00%
Alexey Dobriyan
1
3.70%
1
50.00%
Total
27
100.00%
2
100.00%

SLAB_ATTR_RO(align);



static ssize_t object_size_show(struct kmem_cache *s, char *buf)
{
	return sprintf(buf, "%u\n", s->object_size);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
26
96.30%
2
66.67%
Alexey Dobriyan
1
3.70%
1
33.33%
Total
27
100.00%
3
100.00%

SLAB_ATTR_RO(object_size);



static ssize_t objs_per_slab_show(struct kmem_cache *s, char *buf)
{
	return sprintf(buf, "%u\n", oo_objects(s->oo));
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
29
96.67%
2
66.67%
Alexey Dobriyan
1
3.33%
1
33.33%
Total
30
100.00%
3
100.00%

SLAB_ATTR_RO(objs_per_slab);



static ssize_t order_store(struct kmem_cache *s,
				const char *buf, size_t length)
{
	unsigned int order;
	int err;

	err = kstrtouint(buf, 10, &order);
	if (err)
		return err;

	if (order > slub_max_order || order < slub_min_order)
		return -EINVAL;

	calculate_sizes(s, order);
	return length;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
67
97.10%
2
66.67%
Alexey Dobriyan
2
2.90%
1
33.33%
Total
69
100.00%
3
100.00%



static ssize_t order_show(struct kmem_cache *s, char *buf)
{
	return sprintf(buf, "%u\n", oo_order(s->oo));
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
29
96.67%
1
50.00%
Alexey Dobriyan
1
3.33%
1
50.00%
Total
30
100.00%
2
100.00%

SLAB_ATTR(order);



static ssize_t min_partial_show(struct kmem_cache *s, char *buf)
{
	return sprintf(buf, "%lu\n", s->min_partial);
}

Contributors
Person
Tokens
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Commits
CommitProp
Christoph Lameter
27
100.00%
1
100.00%
Total
27
100.00%
1
100.00%



static ssize_t min_partial_store(struct kmem_cache *s, const char *buf,
				 size_t length)
{
	unsigned long min;
	int err;

	err = kstrtoul(buf, 10, &min);
	if (err)
		return err;

	set_min_partial(s, min);
	return length;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
54
98.18%
3
75.00%
Jingoo Han
1
1.82%
1
25.00%
Total
55
100.00%
4
100.00%

SLAB_ATTR(min_partial);



static ssize_t cpu_partial_show(struct kmem_cache *s, char *buf)
{
	return sprintf(buf, "%u\n", slub_cpu_partial(s));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Rientjes
23
82.14%
1
33.33%
Wei Yang
3
10.71%
1
33.33%
Christoph Lameter
2
7.14%
1
33.33%
Total
28
100.00%
3
100.00%



static ssize_t cpu_partial_store(struct kmem_cache *s, const char *buf,
				 size_t length)
{
	unsigned int objects;
	int err;

	err = kstrtouint(buf, 10, &objects);
	if (err)
		return err;
	if (objects && !kmem_cache_has_cpu_partial(s))
		return -EINVAL;

	slub_set_cpu_partial(s, objects);
	flush_all(s);
	return length;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
David Rientjes
59
79.73%
2
33.33%
Christoph Lameter
7
9.46%
1
16.67%
Wei Yang
4
5.41%
1
16.67%
JoonSoo Kim
2
2.70%
1
16.67%
Alexey Dobriyan
2
2.70%
1
16.67%
Total
74
100.00%
6
100.00%

SLAB_ATTR(cpu_partial);



static ssize_t ctor_show(struct kmem_cache *s, char *buf)
{
	if (!s->ctor)
		return 0;
	return sprintf(buf, "%pS\n", s->ctor);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
29
78.38%
1
50.00%
Joe Perches
8
21.62%
1
50.00%
Total
37
100.00%
2
100.00%

SLAB_ATTR_RO(ctor);



static ssize_t aliases_show(struct kmem_cache *s, char *buf)
{
	return sprintf(buf, "%d\n", s->refcount < 0 ? 0 : s->refcount - 1);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
29
78.38%
1
50.00%
Gu Zheng
8
21.62%
1
50.00%
Total
37
100.00%
2
100.00%

SLAB_ATTR_RO(aliases);



static ssize_t partial_show(struct kmem_cache *s, char *buf)
{
	return show_slab_objects(s, buf, SO_PARTIAL);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
25
100.00%
2
100.00%
Total
25
100.00%
2
100.00%

SLAB_ATTR_RO(partial);



static ssize_t cpu_slabs_show(struct kmem_cache *s, char *buf)
{
	return show_slab_objects(s, buf, SO_CPU);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
25
100.00%
2
100.00%
Total
25
100.00%
2
100.00%

SLAB_ATTR_RO(cpu_slabs);



static ssize_t objects_show(struct kmem_cache *s, char *buf)
{
	return show_slab_objects(s, buf, SO_ALL|SO_OBJECTS);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
27
100.00%
3
100.00%
Total
27
100.00%
3
100.00%

SLAB_ATTR_RO(objects);



static ssize_t objects_partial_show(struct kmem_cache *s, char *buf)
{
	return show_slab_objects(s, buf, SO_PARTIAL|SO_OBJECTS);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
27
100.00%
3
100.00%
Total
27
100.00%
3
100.00%

SLAB_ATTR_RO(objects_partial);



static ssize_t slabs_cpu_partial_show(struct kmem_cache *s, char *buf)
{
	int objects = 0;
	int pages = 0;
	int cpu;
	int len;

	for_each_online_cpu(cpu) {
		struct page *page;

		page = slub_percpu_partial(per_cpu_ptr(s->cpu_slab, cpu));

		if (page) {
			pages += page->pages;
			objects += page->pobjects;
		}
	}

	len = sprintf(buf, "%d(%d)", objects, pages);

#ifdef CONFIG_SMP
	for_each_online_cpu(cpu) {
		struct page *page;

		page = slub_percpu_partial(per_cpu_ptr(s->cpu_slab, cpu));

		if (page && len < PAGE_SIZE - 20)
			len += sprintf(buf + len, " C%d=%d(%d)", cpu,
				page->pobjects, page->pages);
	}
#endif
	return len + sprintf(buf + len, "\n");
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
146
91.25%
1
50.00%
Wei Yang
14
8.75%
1
50.00%
Total
160
100.00%
2
100.00%

SLAB_ATTR_RO(slabs_cpu_partial);



static ssize_t reclaim_account_show(struct kmem_cache *s, char *buf)
{
	return sprintf(buf, "%d\n", !!(s->flags & SLAB_RECLAIM_ACCOUNT));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
33
100.00%
2
100.00%
Total
33
100.00%
2
100.00%



static ssize_t reclaim_account_store(struct kmem_cache *s,
				const char *buf, size_t length)
{
	s->flags &= ~SLAB_RECLAIM_ACCOUNT;
	if (buf[0] == '1')
		s->flags |= SLAB_RECLAIM_ACCOUNT;
	return length;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
44
100.00%
2
100.00%
Total
44
100.00%
2
100.00%

SLAB_ATTR(reclaim_account);



static ssize_t hwcache_align_show(struct kmem_cache *s, char *buf)
{
	return sprintf(buf, "%d\n", !!(s->flags & SLAB_HWCACHE_ALIGN));
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Dmitriy Monakhov
31
93.94%
1
50.00%
Christoph Lameter
2
6.06%
1
50.00%
Total
33
100.00%
2
100.00%

SLAB_ATTR_RO(hwcache_align);

#ifdef CONFIG_ZONE_DMA


static ssize_t cache_dma_show(struct kmem_cache *s, char *buf)
{
	return sprintf(buf, "%d\n", !!(s->flags & SLAB_CACHE_DMA));
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Dmitriy Monakhov
19
57.58%
1
50.00%
Christoph Lameter
14
42.42%
1
50.00%
Total
33
100.00%
2
100.00%

SLAB_ATTR_RO(cache_dma);
#endif



static ssize_t usersize_show(struct kmem_cache *s, char *buf)
{
	return sprintf(buf, "%u\n", s->usersize);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
David Windsor
26
96.30%
1
50.00%
Alexey Dobriyan
1
3.70%
1
50.00%
Total
27
100.00%
2
100.00%

SLAB_ATTR_RO(usersize);



static ssize_t destroy_by_rcu_show(struct kmem_cache *s, char *buf)
{
	return sprintf(buf, "%d\n", !!(s->flags & SLAB_TYPESAFE_BY_RCU));
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
32
96.97%
2
66.67%
Paul E. McKenney
1
3.03%
1
33.33%
Total
33
100.00%
3
100.00%

SLAB_ATTR_RO(destroy_by_rcu);



static ssize_t reserved_show(struct kmem_cache *s, char *buf)
{
	return sprintf(buf, "%u\n", s->reserved);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Lai Jiangshan
26
96.30%
1
50.00%
Alexey Dobriyan
1
3.70%
1
50.00%
Total
27
100.00%
2
100.00%

SLAB_ATTR_RO(reserved);

#ifdef CONFIG_SLUB_DEBUG


static ssize_t slabs_show(struct kmem_cache *s, char *buf)
{
	return show_slab_objects(s, buf, SO_ALL);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
25
100.00%
2
100.00%
Total
25
100.00%
2
100.00%

SLAB_ATTR_RO(slabs);



static ssize_t total_objects_show(struct kmem_cache *s, char *buf)
{
	return show_slab_objects(s, buf, SO_ALL|SO_TOTAL);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
27
100.00%
2
100.00%
Total
27
100.00%
2
100.00%

SLAB_ATTR_RO(total_objects);



static ssize_t sanity_checks_show(struct kmem_cache *s, char *buf)
{
	return sprintf(buf, "%d\n", !!(s->flags & SLAB_CONSISTENCY_CHECKS));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
32
96.97%
2
66.67%
Laura Abbott
1
3.03%
1
33.33%
Total
33
100.00%
3
100.00%



static ssize_t sanity_checks_store(struct kmem_cache *s,
				const char *buf, size_t length)
{
	s->flags &= ~SLAB_CONSISTENCY_CHECKS;
	if (buf[0] == '1') {
		s->flags &= ~__CMPXCHG_DOUBLE;
		s->flags |= SLAB_CONSISTENCY_CHECKS;
	}
	return length;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
51
96.23%
2
66.67%
Laura Abbott
2
3.77%
1
33.33%
Total
53
100.00%
3
100.00%

SLAB_ATTR(sanity_checks);



static ssize_t trace_show(struct kmem_cache *s, char *buf)
{
	return sprintf(buf, "%d\n", !!(s->flags & SLAB_TRACE));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
33
100.00%
2
100.00%
Total
33
100.00%
2
100.00%



static ssize_t trace_store(struct kmem_cache *s, const char *buf,
							size_t length)
{
	/*
         * Tracing a merged cache is going to give confusing results
         * as well as cause other issues like converting a mergeable
         * cache into an umergeable one.
         */
	if (s->refcount > 1)
		return -EINVAL;

	s->flags &= ~SLAB_TRACE;
	if (buf[0] == '1') {
		s->flags &= ~__CMPXCHG_DOUBLE;
		s->flags |= SLAB_TRACE;
	}
	return length;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
66
100.00%
3
100.00%
Total
66
100.00%
3
100.00%

SLAB_ATTR(trace);



static ssize_t red_zone_show(struct kmem_cache *s, char *buf)
{
	return sprintf(buf, "%d\n", !!(s->flags & SLAB_RED_ZONE));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
33
100.00%
1
100.00%
Total
33
100.00%
1
100.00%



static ssize_t red_zone_store(struct kmem_cache *s,
				const char *buf, size_t length)
{
	if (any_slab_objects(s))
		return -EBUSY;

	s->flags &= ~SLAB_RED_ZONE;
	if (buf[0] == '1') {
		s->flags |= SLAB_RED_ZONE;
	}
	calculate_sizes(s, -1);
	return length;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
65
100.00%
3
100.00%
Total
65
100.00%
3
100.00%

SLAB_ATTR(red_zone);



static ssize_t poison_show(struct kmem_cache *s, char *buf)
{
	return sprintf(buf, "%d\n", !!(s->flags & SLAB_POISON));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
33
100.00%
1
100.00%
Total
33
100.00%
1
100.00%



static ssize_t poison_store(struct kmem_cache *s,
				const char *buf, size_t length)
{
	if (any_slab_objects(s))
		return -EBUSY;

	s->flags &= ~SLAB_POISON;
	if (buf[0] == '1') {
		s->flags |= SLAB_POISON;
	}
	calculate_sizes(s, -1);
	return length;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
65
100.00%
3
100.00%
Total
65
100.00%
3
100.00%

SLAB_ATTR(poison);



static ssize_t store_user_show(struct kmem_cache *s, char *buf)
{
	return sprintf(buf, "%d\n", !!(s->flags & SLAB_STORE_USER));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
33
100.00%
1
100.00%
Total
33
100.00%
1
100.00%



static ssize_t store_user_store(struct kmem_cache *s,
				const char *buf, size_t length)
{
	if (any_slab_objects(s))
		return -EBUSY;

	s->flags &= ~SLAB_STORE_USER;
	if (buf[0] == '1') {
		s->flags &= ~__CMPXCHG_DOUBLE;
		s->flags |= SLAB_STORE_USER;
	}
	calculate_sizes(s, -1);
	return length;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
72
100.00%
4
100.00%
Total
72
100.00%
4
100.00%

SLAB_ATTR(store_user);



static ssize_t validate_show(struct kmem_cache *s, char *buf)
{
	return 0;
}

Contributors
Person
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Commits
CommitProp
Christoph Lameter
18
100.00%
1
100.00%
Total
18
100.00%
1
100.00%



static ssize_t validate_store(struct kmem_cache *s,
			const char *buf, size_t length)
{
	int ret = -EINVAL;

	if (buf[0] == '1') {
		ret = validate_slab_cache(s);
		if (ret >= 0)
			ret = length;
	}
	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
56
100.00%
1
100.00%
Total
56
100.00%
1
100.00%

SLAB_ATTR(validate);



static ssize_t alloc_calls_show(struct kmem_cache *s, char *buf)
{
	if (!(s->flags & SLAB_STORE_USER))
		return -ENOSYS;
	return list_locations(s, buf, TRACK_ALLOC);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
40
100.00%
1
100.00%
Total
40
100.00%
1
100.00%

SLAB_ATTR_RO(alloc_calls);



static ssize_t free_calls_show(struct kmem_cache *s, char *buf)
{
	if (!(s->flags & SLAB_STORE_USER))
		return -ENOSYS;
	return list_locations(s, buf, TRACK_FREE);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
40
100.00%
2
100.00%
Total
40
100.00%
2
100.00%

SLAB_ATTR_RO(free_calls);
#endif /* CONFIG_SLUB_DEBUG */

#ifdef CONFIG_FAILSLAB


static ssize_t failslab_show(struct kmem_cache *s, char *buf)
{
	return sprintf(buf, "%d\n", !!(s->flags & SLAB_FAILSLAB));
}

Contributors
Person
Tokens
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Commits
CommitProp
Christoph Lameter
33
100.00%
2
100.00%
Total
33
100.00%
2
100.00%



static ssize_t failslab_store(struct kmem_cache *s, const char *buf,
							size_t length)
{
	if (s->refcount > 1)
		return -EINVAL;

	s->flags &= ~SLAB_FAILSLAB;
	if (buf[0] == '1')
		s->flags |= SLAB_FAILSLAB;
	return length;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
56
100.00%
4
100.00%
Total
56
100.00%
4
100.00%

SLAB_ATTR(failslab);
#endif



static ssize_t shrink_show(struct kmem_cache *s, char *buf)
{
	return 0;
}

Contributors
Person
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Commits
CommitProp
Christoph Lameter
18
100.00%
1
100.00%
Total
18
100.00%
1
100.00%



static ssize_t shrink_store(struct kmem_cache *s,
			const char *buf, size_t length)
{
	if (buf[0] == '1')
		kmem_cache_shrink(s);
	else
		return -EINVAL;
	return length;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
40
97.56%
1
50.00%
Vladimir Davydov
1
2.44%
1
50.00%
Total
41
100.00%
2
100.00%

SLAB_ATTR(shrink);

#ifdef CONFIG_NUMA


static ssize_t remote_node_defrag_ratio_show(struct kmem_cache *s, char *buf)
{
	return sprintf(buf, "%u\n", s->remote_node_defrag_ratio / 10);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
28
96.55%
2
66.67%
Alexey Dobriyan
1
3.45%
1
33.33%
Total
29
100.00%
3
100.00%



static ssize_t remote_node_defrag_ratio_store(struct kmem_cache *s,
				const char *buf, size_t length)
{
	unsigned int ratio;
	int err;

	err = kstrtouint(buf, 10, &ratio);
	if (err)
		return err;
	if (ratio > 100)
		return -ERANGE;

	s->remote_node_defrag_ratio = ratio * 10;

	return length;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
59
89.39%
3
75.00%
Alexey Dobriyan
7
10.61%
1
25.00%
Total
66
100.00%
4
100.00%

SLAB_ATTR(remote_node_defrag_ratio);
#endif

#ifdef CONFIG_SLUB_STATS


static int show_stat(struct kmem_cache *s, char *buf, enum stat_item si)
{
	unsigned long sum  = 0;
	int cpu;
	int len;
	int *data = kmalloc(nr_cpu_ids * sizeof(int), GFP_KERNEL);

	if (!data)
		return -ENOMEM;

	for_each_online_cpu(cpu) {
		unsigned x = per_cpu_ptr(s->cpu_slab, cpu)->stat[si];

		data[cpu] = x;
		sum += x;
	}

	len = sprintf(buf, "%lu", sum);

#ifdef CONFIG_SMP
	for_each_online_cpu(cpu) {
		if (data[cpu] && len < PAGE_SIZE - 20)
			len += sprintf(buf + len, " C%d=%u", cpu, data[cpu]);
	}
#endif
	kfree(data);
	return len + sprintf(buf + len, "\n");
}

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Christoph Lameter
160
100.00%
4
100.00%
Total
160
100.00%
4
100.00%



static void clear_stat(struct kmem_cache *s, enum stat_item si)
{
	int cpu;

	for_each_online_cpu(cpu)
		per_cpu_ptr(s->cpu_slab, cpu)->stat[si] = 0;
}

Contributors
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David Rientjes
35
92.11%
1
50.00%
Christoph Lameter
3
7.89%
1
50.00%
Total
38
100.00%
2
100.00%


#define STAT_ATTR(si, text) 					\
static ssize_t text##_show(struct kmem_cache *s, char *buf)     \
{                                                               \
        return show_stat(s, buf, si);                           \
}                                                               \
static ssize_t text##_store(struct kmem_cache *s,               \
                                const char *buf, size_t length) \
{                                                               \
        if (buf[0] != '0')                                      \
                return -EINVAL;                                 \
        clear_stat(s, si);                                      \
        return length;                                          \
}                                                               \
SLAB_ATTR(text);                                                \

STAT_ATTR(ALLOC_FASTPATH, alloc_fastpath);
STAT_ATTR(ALLOC_SLOWPATH, alloc_slowpath);
STAT_ATTR(FREE_FASTPATH, free_fastpath);
STAT_ATTR(FREE_SLOWPATH, free_slowpath);
STAT_ATTR(FREE_FROZEN, free_frozen);
STAT_ATTR(FREE_ADD_PARTIAL, free_add_partial);
STAT_ATTR(FREE_REMOVE_PARTIAL, free_remove_partial);
STAT_ATTR(ALLOC_FROM_PARTIAL, alloc_from_partial);
STAT_ATTR(ALLOC_SLAB, alloc_slab);
STAT_ATTR(ALLOC_REFILL, alloc_refill);
STAT_ATTR(ALLOC_NODE_MISMATCH, alloc_node_mismatch);
STAT_ATTR(FREE_SLAB, free_slab);
STAT_ATTR(CPUSLAB_FLUSH, cpuslab_flush);
STAT_ATTR(DEACTIVATE_FULL, deactivate_full);
STAT_ATTR(DEACTIVATE_EMPTY, deactivate_empty);
STAT_ATTR(DEACTIVATE_TO_HEAD, deactivate_to_head);
STAT_ATTR(DEACTIVATE_TO_TAIL, deactivate_to_tail);
STAT_ATTR(DEACTIVATE_REMOTE_FREES, deactivate_remote_frees);
STAT_ATTR(DEACTIVATE_BYPASS, deactivate_bypass);
STAT_ATTR(ORDER_FALLBACK, order_fallback);
STAT_ATTR(CMPXCHG_DOUBLE_CPU_FAIL, cmpxchg_double_cpu_fail);
STAT_ATTR(CMPXCHG_DOUBLE_FAIL, cmpxchg_double_fail);
STAT_ATTR(CPU_PARTIAL_ALLOC, cpu_partial_alloc);
STAT_ATTR(CPU_PARTIAL_FREE, cpu_partial_free);
STAT_ATTR(CPU_PARTIAL_NODE, cpu_partial_node);
STAT_ATTR(CPU_PARTIAL_DRAIN, cpu_partial_drain);
#endif


static struct attribute *slab_attrs[] = {
	&slab_size_attr.attr,
	&object_size_attr.attr,
	&objs_per_slab_attr.attr,
	&order_attr.attr,
	&min_partial_attr.attr,
	&cpu_partial_attr.attr,
	&objects_attr.attr,
	&objects_partial_attr.attr,
	&partial_attr.attr,
	&cpu_slabs_attr.attr,
	&ctor_attr.attr,
	&aliases_attr.attr,
	&align_attr.attr,
	&hwcache_align_attr.attr,
	&reclaim_account_attr.attr,
	&destroy_by_rcu_attr.attr,
	&shrink_attr.attr,
	&reserved_attr.attr,
	&slabs_cpu_partial_attr.attr,
#ifdef CONFIG_SLUB_DEBUG
	&total_objects_attr.attr,
	&slabs_attr.attr,
	&sanity_checks_attr.attr,
	&trace_attr.attr,
	&red_zone_attr.attr,
	&poison_attr.attr,
	&store_user_attr.attr,
	&validate_attr.attr,
	&alloc_calls_attr.attr,
	&free_calls_attr.attr,
#endif
#ifdef CONFIG_ZONE_DMA
	&cache_dma_attr.attr,
#endif
#ifdef CONFIG_NUMA
	&remote_node_defrag_ratio_attr.attr,
#endif
#ifdef CONFIG_SLUB_STATS
	&alloc_fastpath_attr.attr,
	&alloc_slowpath_attr.attr,
	&free_fastpath_attr.attr,
	&free_slowpath_attr.attr,
	&free_frozen_attr.attr,
	&free_add_partial_attr.attr,
	&free_remove_partial_attr.attr,
	&alloc_from_partial_attr.attr,
	&alloc_slab_attr.attr,
	&alloc_refill_attr.attr,
	&alloc_node_mismatch_attr.attr,
	&free_slab_attr.attr,
	&cpuslab_flush_attr.attr,
	&deactivate_full_attr.attr,
	&deactivate_empty_attr.attr,
	&deactivate_to_head_attr.attr,
	&deactivate_to_tail_attr.attr,
	&deactivate_remote_frees_attr.attr,
	&deactivate_bypass_attr.attr,
	&order_fallback_attr.attr,
	&cmpxchg_double_fail_attr.attr,
	&cmpxchg_double_cpu_fail_attr.attr,
	&cpu_partial_alloc_attr.attr,
	&cpu_partial_free_attr.attr,
	&cpu_partial_node_attr.attr,
	&cpu_partial_drain_attr.attr,
#endif
#ifdef CONFIG_FAILSLAB
	&failslab_attr.attr,
#endif
	&usersize_attr.attr,

	NULL
};


static const struct attribute_group slab_attr_group = {
	.attrs = slab_attrs,
};



static ssize_t slab_attr_show(struct kobject *kobj,
				struct attribute *attr,
				char *buf)
{
	struct slab_attribute *attribute;
	struct kmem_cache *s;
	int err;

	attribute = to_slab_attr(attr);
	s = to_slab(kobj);

	if (!attribute->show)
		return -EIO;

	err = attribute->show(s, buf);

	return err;
}

Contributors
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Christoph Lameter
72
100.00%
1
100.00%
Total
72
100.00%
1
100.00%



static ssize_t slab_attr_store(struct kobject *kobj,
				struct attribute *attr,
				const char *buf, size_t len)
{
	struct slab_attribute *attribute;
	struct kmem_cache *s;
	int err;

	attribute = to_slab_attr(attr);
	s = to_slab(kobj);

	if (!attribute->store)
		return -EIO;

	err = attribute->store(s, buf, len);
#ifdef CONFIG_MEMCG
	if (slab_state >= FULL && err >= 0 && is_root_cache(s)) {
		struct kmem_cache *c;

		mutex_lock(&slab_mutex);
		if (s->max_attr_size < len)
			s->max_attr_size = len;

		/*
                 * This is a best effort propagation, so this function's return
                 * value will be determined by the parent cache only. This is
                 * basically because not all attributes will have a well
                 * defined semantics for rollbacks - most of the actions will
                 * have permanent effects.
                 *
                 * Returning the error value of any of the children that fail
                 * is not 100 % defined, in the sense that users seeing the
                 * error code won't be able to know anything about the state of
                 * the cache.
                 *
                 * Only returning the error code for the parent cache at least
                 * has well defined semantics. The cache being written to
                 * directly either failed or succeeded, in which case we loop
                 * through the descendants with best-effort propagation.
                 */
		for_each_memcg_cache(c, s)
			attribute->store(c, buf, len);
		mutex_unlock(&slab_mutex);
	}
#endif
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
78
52.35%
1
20.00%
Glauber de Oliveira Costa
63
42.28%
2
40.00%
Vladimir Davydov
7
4.70%
1
20.00%
Johannes Weiner
1
0.67%
1
20.00%
Total
149
100.00%
5
100.00%



static void memcg_propagate_slab_attrs(struct kmem_cache *s)
{
#ifdef CONFIG_MEMCG
	int i;
	char *buffer = NULL;
	struct kmem_cache *root_cache;

	if (is_root_cache(s))
		return;

	root_cache = s->memcg_params.root_cache;

	/*
         * This mean this cache had no attribute written. Therefore, no point
         * in copying default values around
         */
	if (!root_cache->max_attr_size)
		return;

	for (i = 0; i < ARRAY_SIZE(slab_attrs); i++) {
		char mbuf[64];
		char *buf;
		struct slab_attribute *attr = to_slab_attr(slab_attrs[i]);
		ssize_t len;

		if (!attr || !attr->store || !attr->show)
			continue;

		/*
                 * It is really bad that we have to allocate here, so we will
                 * do it only as a fallback. If we actually allocate, though,
                 * we can just use the allocated buffer until the end.
                 *
                 * Most of the slub attributes will tend to be very small in
                 * size, but sysfs allows buffers up to a page, so they can
                 * theoretically happen.
                 */
		if (buffer)
			buf = buffer;
		else if (root_cache->max_attr_size < ARRAY_SIZE(mbuf))
			buf = mbuf;
		else {
			buffer = (char *) get_zeroed_page(GFP_KERNEL);
			if (WARN_ON(!buffer))
				continue;
			buf = buffer;
		}

		len = attr->show(root_cache, buf);
		if (len > 0)
			attr->store(s, buf, len);
	}

	if (buffer)
		free_page((unsigned long)buffer);
#endif
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Glauber de Oliveira Costa
180
86.54%
1
20.00%
Vladimir Davydov
15
7.21%
2
40.00%
Thomas Gleixner
12
5.77%
1
20.00%
Johannes Weiner
1
0.48%
1
20.00%
Total
208
100.00%
5
100.00%



static void kmem_cache_release(struct kobject *k)
{
	slab_kmem_cache_release(to_slab(k));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
19
100.00%
1
100.00%
Total
19
100.00%
1
100.00%


static const struct sysfs_ops slab_sysfs_ops = {
	.show = slab_attr_show,
	.store = slab_attr_store,
};


static struct kobj_type slab_ktype = {
	.sysfs_ops = &slab_sysfs_ops,
	.release = kmem_cache_release,
};



static int uevent_filter(struct kset *kset, struct kobject *kobj)
{
	struct kobj_type *ktype = get_ktype(kobj);

	if (ktype == &slab_ktype)
		return 1;
	return 0;
}

Contributors
Person
Tokens
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CommitProp
Christoph Lameter
39
100.00%
1
100.00%
Total
39
100.00%
1
100.00%


static const struct kset_uevent_ops slab_uevent_ops = {
	.filter = uevent_filter,
};


static struct kset *slab_kset;



static inline struct kset *cache_kset(struct kmem_cache *s)
{
#ifdef CONFIG_MEMCG
	if (!is_root_cache(s))
		return s->memcg_params.root_cache->memcg_kset;
#endif
	return slab_kset;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Vladimir Davydov
38
97.44%
2
66.67%
Johannes Weiner
1
2.56%
1
33.33%
Total
39
100.00%
3
100.00%


#define ID_STR_LENGTH 64

/* Create a unique string id for a slab cache:
 *
 * Format       :[flags-]size
 */


static char *create_unique_id(struct kmem_cache *s)
{
	char *name = kmalloc(ID_STR_LENGTH, GFP_KERNEL);
	char *p = name;

	BUG_ON(!name);

	*p++ = ':';
	/*
         * First flags affecting slabcache operations. We will only
         * get here for aliasable slabs so we do not need to support
         * too many flags. The flags here must cover all flags that
         * are matched during merging to guarantee that the id is
         * unique.
         */
	if (s->flags & SLAB_CACHE_DMA)
		*p++ = 'd';
	if (s->flags & SLAB_RECLAIM_ACCOUNT)
		*p++ = 'a';
	if (s->flags & SLAB_CONSISTENCY_CHECKS)
		*p++ = 'F';
	if (s->flags & SLAB_ACCOUNT)
		*p++ = 'A';
	if (p != name + 1)
		*p++ = '-';
	p += sprintf(p, "%07u", s->size);

	BUG_ON(p > name + ID_STR_LENGTH - 1);
	return name;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
123
88.49%
1
25.00%
Vladimir Davydov
14
10.07%
1
25.00%
Alexey Dobriyan
1
0.72%
1
25.00%
Laura Abbott
1
0.72%
1
25.00%
Total
139
100.00%
4
100.00%



static void sysfs_slab_remove_workfn(struct work_struct *work)
{
	struct kmem_cache *s =
		container_of(work, struct kmem_cache, kobj_remove_work);

	if (!s->kobj.state_in_sysfs)
		/*
                 * For a memcg cache, this may be called during
                 * deactivation and again on shutdown.  Remove only once.
                 * A cache is never shut down before deactivation is
                 * complete, so no need to worry about synchronization.
                 */
		goto out;

#ifdef CONFIG_MEMCG
	kset_unregister(s->memcg_kset);
#endif
	kobject_uevent(&s->kobj, KOBJ_REMOVE);
	kobject_del(&s->kobj);
out:
	kobject_put(&s->kobj);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Tejun Heo
74
93.67%
1
50.00%
Vladimir Davydov
5
6.33%
1
50.00%
Total
79
100.00%
2
100.00%



static int sysfs_slab_add(struct kmem_cache *s)
{
	int err;
	const char *name;
	struct kset *kset = cache_kset(s);
	int unmergeable = slab_unmergeable(s);

	INIT_WORK(&s->kobj_remove_work, sysfs_slab_remove_workfn);

	if (!kset) {
		kobject_init(&s->kobj, &slab_ktype);
		return 0;
	}

	if (!unmergeable && disable_higher_order_debug &&
			(slub_debug & DEBUG_METADATA_FLAGS))
		unmergeable = 1;

	if (unmergeable) {
		/*
                 * Slabcache can never be merged so we can use the name proper.
                 * This is typically the case for debug situations. In that
                 * case we can catch duplicate names easily.
                 */
		sysfs_remove_link(&slab_kset->kobj, s->name);
		name = s->name;
	} else {
		/*
                 * Create a unique name for the slab as a target
                 * for the symlinks.
                 */
		name = create_unique_id(s);
	}

	s->kobj.kset = kset;
	err = kobject_init_and_add(&s->kobj, &slab_ktype, NULL, "%s", name);
	if (err)
		goto out;

	err = sysfs_create_group(&s->kobj, &slab_attr_group);
	if (err)
		goto out_del_kobj;

#ifdef CONFIG_MEMCG
	if (is_root_cache(s) && memcg_sysfs_enabled) {
		s->memcg_kset = kset_create_and_add("cgroup", NULL, &s->kobj);
		if (!s->memcg_kset) {
			err = -ENOMEM;
			goto out_del_kobj;
		}
	}
#endif

	kobject_uevent(&s->kobj, KOBJ_ADD);
	if (!unmergeable) {
		/* Setup first alias */
		sysfs_slab_alias(s, s->name);
	}
out:
	if (!unmergeable)
		kfree(name);
	return err;
out_del_kobj:
	kobject_del(&s->kobj);
	goto out;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
119
42.65%
2
15.38%
Tejun Heo
44
15.77%
2
15.38%
Vladimir Davydov
40
14.34%
1
7.69%
Dave Jones
33
11.83%
1
7.69%
Greg Kroah-Hartman
22
7.89%
3
23.08%
Miles Chen
17
6.09%
1
7.69%
Tetsuo Handa
2
0.72%
1
7.69%
Johannes Weiner
1
0.36%
1
7.69%
Konstantin Khlebnikov
1
0.36%
1
7.69%
Total
279
100.00%
13
100.00%



static void sysfs_slab_remove(struct kmem_cache *s)
{
	if (slab_state < FULL)
		/*
                 * Sysfs has not been setup yet so no need to remove the
                 * cache from sysfs.
                 */
		return;

	kobject_get(&s->kobj);
	schedule_work(&s->kobj_remove_work);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
30
85.71%
4
66.67%
Tejun Heo
5
14.29%
2
33.33%
Total
35
100.00%
6
100.00%



void sysfs_slab_release(struct kmem_cache *s)
{
	if (slab_state >= FULL)
		kobject_put(&s->kobj);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Tejun Heo
15
62.50%
1
33.33%
Christoph Lameter
9
37.50%
2
66.67%
Total
24
100.00%
3
100.00%

/*
 * Need to buffer aliases during bootup until sysfs becomes
 * available lest we lose that information.
 */

struct saved_alias {
	
struct kmem_cache *s;
	
const char *name;
	
struct saved_alias *next;
};


static struct saved_alias *alias_list;



static int sysfs_slab_alias(struct kmem_cache *s, const char *name)
{
	struct saved_alias *al;

	if (slab_state == FULL) {
		/*
                 * If we have a leftover link then remove it.
                 */
		sysfs_remove_link(&slab_kset->kobj, name);
		return sysfs_create_link(&slab_kset->kobj, &s->kobj, name);
	}

	al = kmalloc(sizeof(struct saved_alias), GFP_KERNEL);
	if (!al)
		return -ENOMEM;

	al->s = s;
	al->name = name;
	al->next = alias_list;
	alias_list = al;
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
99
96.12%
2
66.67%
Greg Kroah-Hartman
4
3.88%
1
33.33%
Total
103
100.00%
3
100.00%



static int __init slab_sysfs_init(void)
{
	struct kmem_cache *s;
	int err;

	mutex_lock(&slab_mutex);

	slab_kset = kset_create_and_add("slab", &slab_uevent_ops, kernel_kobj);
	if (!slab_kset) {
		mutex_unlock(&slab_mutex);
		pr_err("Cannot register slab subsystem.\n");
		return -ENOSYS;
	}

	slab_state = FULL;

	list_for_each_entry(s, &slab_caches, list) {
		err = sysfs_slab_add(s);
		if (err)
			pr_err("SLUB: Unable to add boot slab %s to sysfs\n",
			       s->name);
	}

	while (alias_list) {
		struct saved_alias *al = alias_list;

		alias_list = alias_list->next;
		err = sysfs_slab_alias(al->s, al->name);
		if (err)
			pr_err("SLUB: Unable to add boot slab alias %s to sysfs\n",
			       al->name);
		kfree(al);
	}

	mutex_unlock(&slab_mutex);
	resiliency_test();
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
138
90.20%
7
63.64%
Greg Kroah-Hartman
9
5.88%
2
18.18%
Fabian Frederick
5
3.27%
1
9.09%
Julia Lawall
1
0.65%
1
9.09%
Total
153
100.00%
11
100.00%

__initcall(slab_sysfs_init);
#endif /* CONFIG_SYSFS */

/*
 * The /proc/slabinfo ABI
 */
#ifdef CONFIG_SLUB_DEBUG


void get_slabinfo(struct kmem_cache *s, struct slabinfo *sinfo)
{
	unsigned long nr_slabs = 0;
	unsigned long nr_objs = 0;
	unsigned long nr_free = 0;
	int node;
	struct kmem_cache_node *n;

	for_each_kmem_cache_node(s, node, n) {
		nr_slabs += node_nr_slabs(n);
		nr_objs += node_nr_objs(n);
		nr_free += count_partial(n, count_free);
	}

	sinfo->active_objs = nr_objs - nr_free;
	sinfo->num_objs = nr_objs;
	sinfo->active_slabs = nr_slabs;
	sinfo->num_slabs = nr_slabs;
	sinfo->objects_per_slab = oo_objects(s->oo);
	sinfo->cache_order = oo_order(s->oo);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Pekka J Enberg
58
47.54%
1
16.67%
Glauber de Oliveira Costa
32
26.23%
1
16.67%
Christoph Lameter
30
24.59%
3
50.00%
Wanpeng Li
2
1.64%
1
16.67%
Total
122
100.00%
6
100.00%



void slabinfo_show_stats(struct seq_file *m, struct kmem_cache *s)
{
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Alexey Dobriyan
7
50.00%
1
50.00%
Glauber de Oliveira Costa
7
50.00%
1
50.00%
Total
14
100.00%
2
100.00%



ssize_t slabinfo_write(struct file *file, const char __user *buffer,
		       size_t count, loff_t *ppos)
{
	return -EIO;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Glauber de Oliveira Costa
16
59.26%
1
50.00%
Alexey Dobriyan
11
40.74%
1
50.00%
Total
27
100.00%
2
100.00%

#endif /* CONFIG_SLUB_DEBUG */
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
16039
65.53%
176
37.21%
Jesper Dangaard Brouer
800
3.27%
12
2.54%
JoonSoo Kim
754
3.08%
20
4.23%
Thomas Garnier
510
2.08%
1
0.21%
Vladimir Davydov
383
1.56%
18
3.81%
Kees Cook
383
1.56%
5
1.06%
David Rientjes
378
1.54%
15
3.17%
Glauber de Oliveira Costa
361
1.47%
10
2.11%
Pekka J Enberg
343
1.40%
14
2.96%
Yasunori Goto
331
1.35%
1
0.21%
Tejun Heo
295
1.21%
8
1.69%
Laura Abbott
279
1.14%
4
0.85%
Eduard - Gabriel Munteanu
274
1.12%
4
0.85%
Lai Jiangshan
233
0.95%
3
0.63%
Andrey Ryabinin
217
0.89%
6
1.27%
Thomas Gleixner
198
0.81%
3
0.63%
Wei Yang
192
0.78%
7
1.48%
Alexander Potapenko
158
0.65%
4
0.85%
Alexey Dobriyan
155
0.63%
17
3.59%
Mel Gorman
144
0.59%
10
2.11%
Eric Dumazet
138
0.56%
5
1.06%
Linus Torvalds
127
0.52%
2
0.42%
Andrey Konovalov
102
0.42%
1
0.21%
Fabian Frederick
97
0.40%
2
0.42%
Sebastian Andrzej Siewior
83
0.34%
2
0.42%
Dave Hansen
73
0.30%
3
0.63%
Dmitriy Monakhov
73
0.30%
1
0.21%
Richard Kennedy
65
0.27%
1
0.21%
Dmitry Safonov
58
0.24%
1
0.21%
Roman Bobniev
56
0.23%
1
0.21%
David Shaohua Li
55
0.22%
3
0.63%
Alex Shi
50
0.20%
2
0.42%
Alexander Beregalov
48
0.20%
1
0.21%
Steven Rostedt
46
0.19%
1
0.21%
Shakeel Butt
45
0.18%
1
0.21%
Gilad Ben-Yossef
44
0.18%
1
0.21%
David Windsor
44
0.18%
1
0.21%
Dave Jones
41
0.17%
3
0.63%
Greg Kroah-Hartman
41
0.17%
5
1.06%
Peter Zijlstra
39
0.16%
1
0.21%
Ezequiel García
37
0.15%
1
0.21%
Heiko Carstens
36
0.15%
2
0.42%
Li Zefan
35
0.14%
3
0.63%
Vegard Nossum
34
0.14%
3
0.63%
Chris Wilson
29
0.12%
1
0.21%
Cyrill V. Gorcunov
28
0.11%
2
0.42%
Xiaotian Feng
27
0.11%
1
0.21%
Kirill A. Shutemov
26
0.11%
3
0.63%
Michal Hocko
26
0.11%
4
0.85%
Ben Greear
26
0.11%
1
0.21%
Rusty Russell
24
0.10%
2
0.42%
Catalin Marinas
23
0.09%
2
0.42%
Andrew Morton
23
0.09%
1
0.21%
Joe Perches
22
0.09%
3
0.63%
Akinobu Mita
19
0.08%
3
0.63%
Daniel R Thompson
19
0.08%
1
0.21%
Nicholas Piggin
18
0.07%
1
0.21%
Miles Chen
18
0.07%
2
0.42%
Yanmin Zhang
18
0.07%
1
0.21%
Namhyung Kim
15
0.06%
3
0.63%
Chintan Pandya
15
0.06%
1
0.21%
Alexander Popov
13
0.05%
1
0.21%
Balasubramani Vivekanandan
13
0.05%
1
0.21%
Satyam Sharma
12
0.05%
1
0.21%
Sean Rees
10
0.04%
1
0.21%
Jan Beulich
10
0.04%
1
0.21%
Stanislaw Gruszka
9
0.04%
1
0.21%
Ingo Molnar
9
0.04%
2
0.42%
Chris J Arges
9
0.04%
1
0.21%
Kamezawa Hiroyuki
9
0.04%
1
0.21%
Gu Zheng
8
0.03%
1
0.21%
Dmitriy Vyukov
7
0.03%
2
0.42%
Salman Qazi
7
0.03%
1
0.21%
Johannes Weiner
6
0.02%
2
0.42%
Harvey Harrison
6
0.02%
1
0.21%
Mark Rutland
6
0.02%
1
0.21%
Vlastimil Babka
5
0.02%
2
0.42%
Paul E. McKenney
5
0.02%
1
0.21%
Dmitry Adamushko
4
0.02%
1
0.21%
Miao Xie
4
0.02%
1
0.21%
Chen Gang S
3
0.01%
1
0.21%
Daniel Sanders
3
0.01%
1
0.21%
Roman Zippel
3
0.01%
1
0.21%
Borislav Petkov
3
0.01%
1
0.21%
Zhi Yong Wu
2
0.01%
1
0.21%
Tetsuo Handa
2
0.01%
1
0.21%
Benjamin Herrenschmidt
2
0.01%
2
0.42%
Nick Andrew
2
0.01%
1
0.21%
Adrian Bunk
2
0.01%
1
0.21%
Yang Shi
2
0.01%
1
0.21%
Lucas De Marchi
2
0.01%
1
0.21%
Emese Revfy
2
0.01%
2
0.42%
Vasiliy Kulikov
2
0.01%
1
0.21%
Tero Roponen
2
0.01%
1
0.21%
Wanpeng Li
2
0.01%
1
0.21%
Fengguang Wu
2
0.01%
1
0.21%
Jianpeng Ma (马建朋)
2
0.01%
1
0.21%
Alexander (Sasha) Levin
2
0.01%
1
0.21%
Li Peng
1
0.00%
1
0.21%
Frederik Schwarzer
1
0.00%
1
0.21%
Pavel Emelyanov
1
0.00%
1
0.21%
Arvind Yadav
1
0.00%
1
0.21%
Julia Lawall
1
0.00%
1
0.21%
Jason Low
1
0.00%
1
0.21%
Jingoo Han
1
0.00%
1
0.21%
Phil Carmody
1
0.00%
1
0.21%
Adam Buchbinder
1
0.00%
1
0.21%
Chris Metcalf
1
0.00%
1
0.21%
Kim Phillips
1
0.00%
1
0.21%
Andi Kleen
1
0.00%
1
0.21%
Konstantin Khlebnikov
1
0.00%
1
0.21%
Total
24475
100.00%
473
100.00%
Directory: mm

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