Release 4.8 mm/slub.c

/*
 * 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/kmemcheck.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 <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 */

#define __OBJECT_POISON		0x80000000UL 
/* Poison object */

#define __CMPXCHG_DOUBLE	0x40000000UL 
/* Use cmpxchg_double */

#ifdef CONFIG_SMP

static struct notifier_block slab_notifier;
#endif

/*
 * 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);
#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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#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
 *******************************************************************/



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

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

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

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

	probe_kernel_read(&p, (void **)(object + s->offset), sizeof(p));
	return p;
}

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static inline void set_freepointer(struct kmem_cache *s, void *object, void *fp)
{
	*(void **)(object + s->offset) = fp;
}

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

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

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

	return x;
}

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

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static inline 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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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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#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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static inline 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 int slub_debug = DEBUG_DEFAULT_FLAGS;
#else

static int 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();
}

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/*
 * 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;
}

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

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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
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
linus torvalds
93
50.27%
1
16.67%
christoph lameter
christoph lameter
79
42.70%
2
33.33%
andrey ryabinin
andrey ryabinin
6
3.24%
1
16.67%
akinobu mita
akinobu mita
5
2.70%
1
16.67%
eduard gabriel munteanu
eduard gabriel munteanu
2
1.08%
1
16.67%
Total
185
100.00%
6
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
christoph lameter
47
95.92%
2
66.67%
eduard gabriel munteanu
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)
{
	if (!t->addr)
		return;

	pr_err("INFO: %s in %pS age=%lu cpu=%u pid=%d\n",
	       s, (void *)t->addr, jiffies - 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
christoph lameter
49
47.57%
2
33.33%
linus torvalds
linus torvalds
48
46.60%
2
33.33%
eduard gabriel munteanu
eduard gabriel munteanu
4
3.88%
1
16.67%
fabian frederick
fabian frederick
2
1.94%
1
16.67%
Total
103
100.00%
6
100.00%



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

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

Contributors
Person
Tokens
Prop
Commits
CommitProp
christoph lameter
christoph lameter
55
100.00%
1
100.00%
Total
55
100.00%
1
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
christoph lameter
33
97.06%
2
66.67%
fabian frederick
fabian frederick
1
2.94%
1
33.33%
Total
34
100.00%
3
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
christoph lameter
45
55.56%
1
16.67%
fabian frederick
fabian frederick
26
32.10%
2
33.33%
dave jones
dave jones
8
9.88%
2
33.33%
rusty russell
rusty russell
2
2.47%
1
16.67%
Total
81
100.00%
6
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
christoph lameter
39
63.93%
1
33.33%
fabian frederick
fabian frederick
22
36.07%
2
66.67%
Total
61
100.00%
3
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("Redzone ", p - s->red_left_pad, s->red_left_pad);
	else if (p > addr + 16)
		print_section("Bytes b4 ", p - 16, 16);

	print_section("Object ", p, min_t(unsigned long, s->object_size,
				PAGE_SIZE));
	if (s->flags & SLAB_RED_ZONE)
		print_section("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("Padding ", p + off, size_from_object(s) - off);

	dump_stack();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
christoph lameter
christoph lameter
183
79.91%
4
44.44%
joonsoo kim
joonsoo kim
30
13.10%
1
11.11%
alexander potapenko
alexander potapenko
7
3.06%
1
11.11%
sebastian andrzej siewior
sebastian andrzej siewior
4
1.75%
1
11.11%
pekka j enberg
pekka j enberg
4
1.75%
1
11.11%
fabian frederick
fabian frederick
1
0.44%
1
11.11%
Total
229
100.00%
9
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
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
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
christoph lameter
85
78.70%
3
75.00%
joonsoo kim
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
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
christoph lameter
136
94.44%
1
25.00%
andrey ryabinin
andrey ryabinin
6
4.17%
1
25.00%
fabian frederick
fabian frederick
1
0.69%
1
25.00%
akinobu mita
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
christoph lameter
94
87.85%
2
50.00%
alexander potapenko
alexander potapenko
7
6.54%
1
25.00%
joonsoo kim
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;
	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;

	metadata_access_enable();
	fault = memchr_inv(end - remainder, 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("Padding ", end - remainder, remainder);

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

Contributors
Person
Tokens
Prop
Commits
CommitProp
christoph lameter
christoph lameter
165
91.67%
6
54.55%
andrey ryabinin
andrey ryabinin
6
3.33%
1
9.09%
lai jiangshan
lai jiangshan
4
2.22%
1
9.09%
eric dumazet
eric dumazet
3
1.67%
1
9.09%
akinobu mita
akinobu mita
1
0.56%
1
9.09%
sebastian andrzej siewior
sebastian andrzej siewior
1
0.56%
1
9.09%
Total
180
100.00%
11
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
christoph lameter
268
89.33%
5
62.50%
joonsoo kim
joonsoo kim
29
9.67%
1
12.50%
ingo molnar
ingo molnar
2
0.67%
1
12.50%
nick andrew
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
christoph lameter
129
94.16%
4
80.00%
lai jiangshan
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
christoph lameter
266
95.34%
7
63.64%
lai jiangshan
lai jiangshan
8
2.87%
1
9.09%
joe perches
joe perches
2
0.72%
1
9.09%
cyrill gorcunov
cyrill gorcunov
2
0.72%
1
9.09%
andrey ryabinin
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("Object ", (void *)object,
					s->object_size);

		dump_stack();
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
christoph lameter
christoph lameter
79
97.53%
2
50.00%
sebastian andrzej siewior
sebastian andrzej siewior
1
1.23%
1
25.00%
fabian frederick
fabian frederick
1
1.23%
1
25.00%
Total
81
100.00%
4
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
christoph lameter
46
85.19%
3
75.00%
david rientjes
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
christoph lameter
36
73.47%
1
33.33%
david rientjes
david rientjes
8
16.33%
1
33.33%
peter zijlstra
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
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Commits
CommitProp
christoph lameter
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
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Commits
CommitProp
alexander beregalov
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
christoph lameter
55
94.83%
2
66.67%
joonsoo kim
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
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
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
christoph lameter
69
80.23%
3
60.00%
laura abbott
laura abbott
15
17.44%
1
20.00%
eduard gabriel munteanu
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
christoph lameter
83
63.36%
7
87.50%
laura abbott
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
christoph lameter
123
72.78%
4
40.00%
laura abbott
laura abbott
40
23.67%
2
20.00%
glauber costa
glauber costa
2
1.18%
1
10.00%
ingo molnar
ingo molnar
2
1.18%
1
10.00%
fabian frederick
fabian frederick
1
0.59%
1
10.00%
joe perches
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
laura abbott
156
60.47%
3
25.00%
christoph lameter
christoph lameter
61
23.64%
8
66.67%
jesper dangaard brouer
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
christoph lameter
149
87.65%
3
37.50%
chris j arges
chris j arges
9
5.29%
1
12.50%
dmitriy monakhov
dmitriy monakhov
8
4.71%
1
12.50%
laura abbott
laura abbott
2
1.18%
2
25.00%
fabian frederick
fabian frederick
2
1.18%
1
12.50%
Total
170
100.00%
8
100.00%

__setup("slub_debug", setup_slub_debug);



unsigned long kmem_cache_flags(unsigned long object_size,
	unsigned long 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
christoph lameter
62
98.41%
6
85.71%
david rientjes
david rientjes
1
1.59%
1
14.29%
Total
63
100.00%
7
100.00%

#else /* !CONFIG_SLUB_DEBUG */


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

Contributors
Person
Tokens
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Commits
CommitProp
christoph lameter
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
christoph lameter
26
92.86%
2
66.67%
eduard gabriel munteanu
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
christoph lameter
23
65.71%
2
40.00%
jesper dangaard brouer
jesper dangaard brouer
8
22.86%
1
20.00%
eduard gabriel munteanu
eduard gabriel munteanu
2
5.71%
1
20.00%
laura abbott
laura abbott
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
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
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
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
christoph lameter
16
76.19%
2
66.67%
peter zijlstra
peter zijlstra
5
23.81%
1
33.33%
Total
21
100.00%
3
100.00%



unsigned long kmem_cache_flags(unsigned long object_size,
	unsigned long flags, const char *name,
	void (*ctor)(void *))
{
	return flags;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
christoph lameter
christoph lameter
32
100.00%
4
100.00%
Total
32
100.00%
4
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
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
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Commits
CommitProp
alexander beregalov
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
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
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Commits
CommitProp
christoph lameter
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
roman bobniev
28
75.68%
1
33.33%
andrey ryabinin
andrey ryabinin
7
18.92%
1
33.33%
alexander potapenko
alexander potapenko
2
5.41%
1
33.33%
Total
37
100.00%
3
100.00%



static inline void kfree_hook(const void *x)
{
	kmemleak_free(x);
	kasan_kfree_large(x);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
roman bobniev
roman bobniev
17
77.27%
1
50.00%
andrey ryabinin
andrey ryabinin
5
22.73%
1
50.00%
Total
22
100.00%
2
100.00%



static inline void *slab_free_hook(struct kmem_cache *s, void *x)
{
	void *freeptr;

	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.
         */
#if defined(CONFIG_KMEMCHECK) || defined(CONFIG_LOCKDEP)
	{
		unsigned long flags;

		local_irq_save(flags);
		kmemcheck_slab_free(s, x, s->object_size);
		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);

	freeptr = get_freepointer(s, x);
	/*
         * kasan_slab_free() may put x into memory quarantine, delaying its
         * reuse. In this case the object's freelist pointer is changed.
         */
	kasan_slab_free(s, x);
	return freeptr;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
andrey ryabinin
andrey ryabinin
75
62.50%
2
33.33%
alexander potapenko
alexander potapenko
18
15.00%
1
16.67%
christoph lameter
christoph lameter
16
13.33%
2
33.33%
roman bobniev
roman bobniev
11
9.17%
1
16.67%
Total
120
100.00%
6
100.00%



static inline void 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_KMEMCHECK) ||		\
	defined(CONFIG_LOCKDEP)	||		\
	defined(CONFIG_DEBUG_KMEMLEAK) ||	\
	defined(CONFIG_DEBUG_OBJECTS_FREE) ||	\
	defined(CONFIG_KASAN)

	void *object = head;
	void *tail_obj = tail ? : head;
	void *freeptr;

	do {
		freeptr = slab_free_hook(s, object);
	} while ((object != tail_obj) && (object = freeptr));
#endif
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
jesper dangaard brouer
jesper dangaard brouer
92
92.93%
1
50.00%
alexander potapenko
alexander potapenko
7
7.07%
1
50.00%
Total
99
100.00%
2
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
thomas gleixner
61
89.71%
1
50.00%
andrey ryabinin
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;
	int order = oo_order(oo);

	flags |= __GFP_NOTRACK;

	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
christoph lameter
48
48.48%
2
33.33%
vladimir davydov
vladimir davydov
46
46.46%
2
33.33%
vegard nossum
vegard nossum
4
4.04%
1
16.67%
vlastimil babka
vlastimil babka
1
1.01%
1
16.67%
Total
99
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)
{
	int err;
	unsigned long i, count = oo_objects(s->oo);

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

Contributors
Person
Tokens
Prop
Commits
CommitProp
thomas garnier
thomas garnier
92
100.00%
1
100.00%
Total
92
100.00%
1
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
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
Person
Tokens
Prop
Commits
CommitProp
thomas garnier
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;
}
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thomas garnier
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
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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thomas garnier
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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thomas garnier
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);
	}

	if (kmemcheck_enabled &&
	    !(s->flags & (SLAB_NOTRACK | DEBUG_DEFAULT_FLAGS))) {
		int pages = 1 << oo_order(oo);

		kmemcheck_alloc_shadow(page, oo_order(oo), alloc_gfp, node);

		/*
                 * Objects from caches that have a constructor don't get
                 * cleared when they're allocated, so we need to do it here.
                 */
		if (s->ctor)
			kmemcheck_mark_uninitialized_pages(page, pages);
		else
			kmemcheck_mark_unallocated_pages(page, pages);
	}

	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_zone_page_state(page_zone(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
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CommitProp
christoph lameter
christoph lameter
200
41.32%
12
38.71%
thomas gleixner
thomas gleixner
75
15.50%
1
3.23%
vegard nossum
vegard nossum
64
13.22%
2
6.45%
joonsoo kim
joonsoo kim
43
8.88%
4
12.90%
mel gorman
mel gorman
24
4.96%
4
12.90%
wei yang
wei yang
22
4.55%
1
3.23%
thomas garnier
thomas garnier
19
3.93%
1
3.23%
pekka j enberg
pekka j enberg
16
3.31%
1
3.23%
glauber costa
glauber costa
9
1.86%
2
6.45%
andrey ryabinin
andrey ryabinin
5
1.03%
1
3.23%
vladimir davydov
vladimir davydov
4
0.83%
1
3.23%
michal hocko
michal hocko
3
0.62%
1
3.23%
Total
484
100.00%
31
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);
	}

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

Contributors
Person
Tokens
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Commits
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thomas gleixner
thomas gleixner
51
69.86%
1
33.33%
michal hocko
michal hocko
22
30.14%
2
66.67%
Total
73
100.00%
3
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);
	}

	kmemcheck_free_shadow(page, compound_order(page));

	mod_zone_page_state(page_zone(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
christoph lameter
107
70.86%
8
57.14%
nick piggin
nick piggin
14
9.27%
1
7.14%
vladimir davydov
vladimir davydov
10
6.62%
1
7.14%
vegard nossum
vegard nossum
10
6.62%
1
7.14%
mel gorman
mel gorman
6
3.97%
2
14.29%
laura abbott
laura abbott
4
2.65%
1
7.14%
Total
151
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
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Commits
CommitProp
christoph lameter
christoph lameter
41
75.93%
1
33.33%
lai jiangshan
lai jiangshan
12
22.22%
1
33.33%
glauber costa
glauber 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_DESTROY_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
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CommitProp
lai jiangshan
lai jiangshan
55
50.93%
1
33.33%
christoph lameter
christoph lameter
52
48.15%
1
33.33%
kirill a. shutemov
kirill a. shutemov
1
0.93%
1
33.33%
Total
108
100.00%
3
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
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CommitProp
christoph lameter
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
christoph lameter
55
94.83%
4
66.67%
li shaohua
li shaohua
2
3.45%
1
16.67%
steven rostedt
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
christoph lameter
15
40.54%
1
33.33%
steven rostedt
steven rostedt
14
37.84%
1
33.33%
peter zijlstra
peter zijlstra
8
21.62%
1
33.33%
Total
37
100.00%
3
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
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steven rostedt
steven rostedt
29
76.32%
1
50.00%
dmitry safonov
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
christoph lameter
121
73.33%
11
73.33%
joonsoo kim
joonsoo kim
35
21.21%
2
13.33%
peter zijlstra
peter zijlstra
8
4.85%
1
6.67%
dave hansen
dave hansen
1
0.61%
1
6.67%
Total
165
100.00%
15
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;
	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 > s->cpu_partial / 2)
			break;

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

Contributors
Person
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Commits
CommitProp
christoph lameter
christoph lameter
150
76.92%
7
58.33%
joonsoo kim
joonsoo kim
35
17.95%
3
25.00%
alex shi
alex shi
10
5.13%
2
16.67%
Total
195
100.00%
12
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
christoph lameter
118
65.92%
5
26.32%
mel gorman
mel gorman
47
26.26%
5
26.32%
miao xie
miao xie
4
2.23%
1
5.26%
joonsoo kim
joonsoo kim
3
1.68%
2
10.53%
pekka j enberg
pekka j enberg
2
1.12%
1
5.26%
david rientjes
david rientjes
2
1.12%
2
10.53%
andi kleen
andi kleen
1
0.56%
1
5.26%
vladimir davydov
vladimir davydov
1
0.56%
1
5.26%
li peng
li peng
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
christoph lameter
72
73.47%
7
70.00%
joonsoo kim
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
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christoph lameter
christoph lameter
17
100.00%
1
100.00%
Total
17
100.00%
1
100.00%



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

Contributors
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christoph lameter
christoph lameter
17
100.00%
1
100.00%
Total
17
100.00%
1
100.00%



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

Contributors
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christoph lameter
christoph lameter
17
100.00%
1
100.00%
Total
17
100.00%
1
100.00%



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

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christoph lameter
christoph lameter
14
100.00%
1
100.00%
Total
14
100.00%
1
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
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Commits
CommitProp
christoph lameter
christoph lameter
128
96.24%
7
77.78%
fabian frederick
fabian frederick
4
3.01%
1
11.11%
namhyung kim
namhyung kim
1
0.75%
1
11.11%
Total
133
100.00%
9
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);
}

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christoph lameter
christoph lameter
33
97.06%
1
50.00%
fengguang wu
fengguang wu
1
2.94%
1
50.00%
Total
34
100.00%
2
100.00%

/*
 * Remove the cpu slab
 */


static void deactivate_slab(struct kmem_cache *s, struct page *page,
				void *freelist)
{
	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);
	}
}

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christoph lameter
christoph lameter
512
98.65%
12
75.00%
peter zijlstra
peter zijlstra
2
0.39%
1
6.25%
li shaohua
li shaohua
2
0.39%
1
6.25%
dave hansen
dave hansen
2
0.39%
1
6.25%
joonsoo kim
joonsoo kim
1
0.19%
1
6.25%
Total
519
100.00%
16
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
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christoph lameter
christoph lameter
158
54.30%
4
36.36%
joonsoo kim
joonsoo kim
83
28.52%
4
36.36%
li shaohua
li shaohua
49
16.84%
2
18.18%
dave hansen
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. This is done without interrupts disabled and without
 * preemption disabled. The cmpxchg is racy and may put the partial page
 * onto a random cpus partial slot.
 *
 * 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
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christoph lameter
christoph lameter
164
72.57%
3
33.33%
vladimir davydov
vladimir davydov
44
19.47%
1
11.11%
joonsoo kim
joonsoo kim
10
4.42%
3
33.33%
alex shi
alex shi
7
3.10%
1
11.11%
fengguang wu
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->tid = next_tid(c->tid);
	c->page = NULL;
	c->freelist = NULL;
}

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christoph lameter
christoph lameter
60
100.00%
6
100.00%
Total
60
100.00%
6
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);
	}
}

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christoph lameter
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
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christoph lameter
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 || c->partial;
}

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gilad ben-yossef
gilad ben-yossef
39
90.70%
1
50.00%
ma jianpeng
ma jianpeng
4
9.30%
1
50.00%
Total
43
100.00%
2
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
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christoph lameter
christoph lameter
19
79.17%
1
50.00%
gilad ben-yossef
gilad ben-yossef
5
20.83%
1
50.00%
Total
24
100.00%
2
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;
}

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christoph lameter
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;
}

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pekka j enberg
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);
}
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david rientjes
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;
}
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pekka j enberg
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: %d, buffer size: %d, default order: %d, min order: %d\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
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pekka j enberg
pekka j enberg
99
54.10%
1
11.11%
david rientjes
david rientjes
53
28.96%
2
22.22%
christoph lameter
christoph lameter
13
7.10%
3
33.33%
alexander beregalov
alexander beregalov
8
4.37%
1
11.11%
fabian frederick
fabian frederick
6
3.28%
1
11.11%
vlastimil babka
vlastimil babka
4
2.19%
1
11.11%
Total
183
100.00%
9
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;
}

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christoph lameter
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;
}

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mel gorman
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
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christoph lameter
christoph lameter
99
98.02%
1
33.33%
joonsoo kim
joonsoo kim
1
0.99%
1
33.33%
dave hansen
dave hansen
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->page = NULL;
			c->freelist = NULL;
			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->page = NULL;
		c->freelist = NULL;
		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 (c->partial) {
		page = c->page = c->partial;
		c->partial = page->next;
		stat(s, CPU_PARTIAL_ALLOC);
		c->freelist = NULL;
		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->page = NULL;
	c->freelist = NULL;
	return freelist;
}

Contributors
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christoph lameter
christoph lameter
331
76.62%
33
82.50%
mel gorman
mel gorman
42
9.72%
1
2.50%
joonsoo kim
joonsoo kim
39
9.03%
1
2.50%
pekka j enberg
pekka j enberg
9
2.08%
1
2.50%
eric dumazet
eric dumazet
7
1.62%
1
2.50%
eduard gabriel munteanu
eduard gabriel munteanu
2
0.46%
1
2.50%
david rientjes
david rientjes
1
0.23%
1
2.50%
dave hansen
dave hansen
1
0.23%
1
2.50%
Total
432
100.00%
40
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
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christoph lameter
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
christoph lameter
174
63.74%
15
50.00%
joonsoo kim
joonsoo kim
31
11.36%
1
3.33%
eric dumazet
eric dumazet
19
6.96%
1
3.33%
akinobu mita
akinobu mita
9
3.30%
1
3.33%
dave hansen
dave hansen
9
3.30%
1
3.33%
vladimir davydov
vladimir davydov
7
2.56%
1
3.33%
vegard nossum
vegard nossum
6
2.20%
1
3.33%
dmitry adamushko
dmitry adamushko
4
1.47%
1
3.33%
mark rutland
mark rutland
3
1.10%
1
3.33%
jesper dangaard brouer
jesper dangaard brouer
3
1.10%
1
3.33%
catalin marinas
catalin marinas
2
0.73%
1
3.33%
pekka j enberg
pekka j enberg
2
0.73%
2
6.67%
eduard gabriel munteanu
eduard gabriel munteanu
2
0.73%
1
3.33%
chen gang
chen gang
1
0.37%
1
3.33%
ezequiel garcia
ezequiel garcia
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 garcia
ezequiel garcia
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
christoph lameter
24
51.06%
2
40.00%
eduard gabriel munteanu
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
richard kennedy
26
44.07%
1
25.00%
eduard gabriel munteanu
eduard gabriel munteanu
22
37.29%
1
25.00%
andrey ryabinin
andrey ryabinin
9
15.25%
1
25.00%
alexander potapenko
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
christoph lameter
28
51.85%
3
42.86%
eduard gabriel munteanu
eduard gabriel munteanu
25
46.30%
3
42.86%
ezequiel garcia
ezequiel garcia
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
richard kennedy
28
42.42%
1
20.00%
eduard gabriel munteanu
eduard gabriel munteanu
26
39.39%
1
20.00%
andrey ryabinin
andrey ryabinin
9
13.64%
1
20.00%
alexander potapenko
alexander potapenko
2
3.03%
1
20.00%
ezequiel garcia
ezequiel garcia
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
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Commits
CommitProp
christoph lameter
christoph lameter
355
81.80%
19
67.86%
joonsoo kim
joonsoo kim
41
9.45%
3
10.71%
jesper dangaard brouer
jesper dangaard brouer
17
3.92%
1
3.57%
alex shi
alex shi
9
2.07%
1
3.57%
peter zijlstra
peter zijlstra
8
1.84%
1
3.57%
eduard gabriel munteanu
eduard gabriel munteanu
2
0.46%
1
3.57%
chen gang
chen gang
1
0.23%
1
3.57%
li shaohua
li shaohua
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
christoph lameter
138
70.77%
10
58.82%
joonsoo kim
joonsoo kim
29
14.87%
1
5.88%
jesper dangaard brouer
jesper dangaard brouer
21
10.77%
2
11.76%
mark rutland
mark rutland
3
1.54%
1
5.88%
eduard gabriel munteanu
eduard gabriel munteanu
2
1.03%
1
5.88%
pekka j enberg
pekka j enberg
1
0.51%
1
5.88%
alexander potapenko
alexander potapenko
1
0.51%
1
5.88%
Total
195
100.00%
17
100.00%



static __always_inline void slab_free(struct kmem_cache *s, struct page *page,
				      void *head, void *tail, int cnt,
				      unsigned long addr)
{
	slab_free_freelist_hook(s, head, tail);
	/*
         * slab_free_freelist_hook() could have put the items into quarantine.
         * If so, no need to free them.
         */
	if (s->flags & SLAB_KASAN && !(s->flags & SLAB_DESTROY_BY_RCU))
		return;
	do_slab_free(s, page, head, tail, cnt, addr);
}

Contributors
Person
Tokens
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Commits
CommitProp
alexander potapenko
alexander potapenko
75
100.00%
1
100.00%
Total
75
100.00%
1
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
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Commits
CommitProp
alexander potapenko
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
christoph lameter
35
64.81%
3
37.50%
glauber costa
glauber costa
9
16.67%
1
12.50%
eduard gabriel munteanu
eduard gabriel munteanu
6
11.11%
3
37.50%
jesper dangaard brouer
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
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Commits
CommitProp
jesper dangaard brouer
jesper dangaard brouer
287
95.35%
5
71.43%
christoph lameter
christoph lameter
13
4.32%
1
14.29%
vladimir davydov
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 (unlikely(!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
jesper dangaard brouer
91
98.91%
4
80.00%
christoph lameter
christoph lameter
1
1.09%
1
20.00%
Total
92
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
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jesper dangaard brouer
jesper dangaard brouer
220
85.60%
4
66.67%
christoph lameter
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 int slub_min_order;

static int slub_max_order = PAGE_ALLOC_COSTLY_ORDER;

static 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 int slab_order(int size, int min_objects,
				int max_order, int fract_leftover, int reserved)
{
	int order;
	int rem;
	int min_order = slub_min_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, get_order(min_objects * size + reserved));
			order <= max_order; order++) {

		unsigned long slab_size = PAGE_SIZE << order;

		rem = (slab_size - reserved) % size;

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

	return order;
}

Contributors
Person
Tokens
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Commits
CommitProp
christoph lameter
christoph lameter
95
84.07%
4
50.00%
lai jiangshan
lai jiangshan
13
11.50%
1
12.50%
wei yang
wei yang
3
2.65%
2
25.00%
cyrill gorcunov
cyrill gorcunov
2
1.77%
1
12.50%
Total
113
100.00%
8
100.00%



static inline int calculate_order(int size, int reserved)
{
	int order;
	int min_objects;
	int fraction;
	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) {
		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
christoph lameter
138
79.77%
5
55.56%
yanmin zhang
yanmin zhang
18
10.40%
1
11.11%
lai jiangshan
lai jiangshan
15
8.67%
1
11.11%
david rientjes
david rientjes
1
0.58%
1
11.11%
wei yang
wei yang
1
0.58%
1
11.11%
Total
173
100.00%
9
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
christoph lameter
59
89.39%
6
75.00%
salman qazi
salman qazi
6
9.09%
1
12.50%
rusty russell
rusty russell
1
1.52%
1
12.50%
Total
66
100.00%
8
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
christoph lameter
64
98.46%
5
83.33%
chris metcalf
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
christoph lameter
155
87.08%
14
70.00%
andrey ryabinin
andrey ryabinin
13
7.30%
1
5.00%
fabian frederick
fabian frederick
4
2.25%
1
5.00%
alexander potapenko
alexander potapenko
2
1.12%
1
5.00%
steven rostedt
steven rostedt
2
1.12%
1
5.00%
li shaohua
li shaohua
1
0.56%
1
5.00%
david rientjes
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) {
		kmem_cache_free(kmem_cache_node, n);
		s->node[node] = NULL;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
christoph lameter
christoph lameter
45
100.00%
3
100.00%
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
dmitry safonov
22
81.48%
1
50.00%
thomas garnier
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;
		}

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

Contributors
Person
Tokens
Prop
Commits
CommitProp
christoph lameter
christoph lameter
84
100.00%
4
100.00%
Total
84
100.00%
4
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
david rientjes
42
100.00%
2
100.00%
Total
42
100.00%
2
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)
{
	unsigned long flags = s->flags;
	size_t size = s->object_size;
	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_DESTROY_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_DESTROY_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 (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
christoph lameter
335
83.75%
16
80.00%
joonsoo kim
joonsoo kim
33
8.25%
1
5.00%
alexander potapenko
alexander potapenko
19
4.75%
1
5.00%
lai jiangshan
lai jiangshan
12
3.00%
1
5.00%
frederik schwarzer
frederik schwarzer
1
0.25%
1
5.00%
Total
400
100.00%
20
100.00%



static int kmem_cache_open(struct kmem_cache *s, unsigned long flags)
{
	s->flags = kmem_cache_flags(s->size, flags, s->name, s->ctor);
	s->reserved = 0;

	if (need_reserve_slab_rcu && (s->flags & SLAB_DESTROY_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);

	/*
         * 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;

#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=%lu realsize=%u order=%u offset=%u flags=%lx\n",
		      s->name, (unsigned long)s->size, s->size,
		      oo_order(s->oo), s->offset, flags);
	return -EINVAL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
christoph lameter
christoph lameter
224
64.00%
15
55.56%
david rientjes
david rientjes
64
18.29%
3
11.11%
lai jiangshan
lai jiangshan
26
7.43%
2
7.41%
thomas garnier
thomas garnier
19
5.43%
1
3.70%
heiko carstens
heiko carstens
12
3.43%
2
7.41%
joonsoo kim
joonsoo kim
2
0.57%
1
3.70%
laura abbott
laura abbott
1
0.29%
1
3.70%
joe perches
joe perches
1
0.29%
1
3.70%
chen gang
chen gang
1
0.29%
1
3.70%
Total
350
100.00%
27
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
christoph lameter
127
83.01%
4
57.14%
eric dumazet
eric dumazet
24
15.69%
1
14.29%
namhyung kim
namhyung kim
1
0.65%
1
14.29%
fabian frederick
fabian frederick
1
0.65%
1
14.29%
Total
153
100.00%
7
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->