Release 4.7 include/linux/percpu.h

Directory: include/linux

#ifndef __LINUX_PERCPU_H

#define __LINUX_PERCPU_H

#include <linux/mmdebug.h>
#include <linux/preempt.h>
#include <linux/smp.h>
#include <linux/cpumask.h>
#include <linux/printk.h>
#include <linux/pfn.h>
#include <linux/init.h>

#include <asm/percpu.h>

/* enough to cover all DEFINE_PER_CPUs in modules */
#ifdef CONFIG_MODULES

#define PERCPU_MODULE_RESERVE		(8 << 10)
#else

#define PERCPU_MODULE_RESERVE		0
#endif

/* minimum unit size, also is the maximum supported allocation size */

#define PCPU_MIN_UNIT_SIZE		PFN_ALIGN(32 << 10)

/*
 * Percpu allocator can serve percpu allocations before slab is
 * initialized which allows slab to depend on the percpu allocator.
 * The following two parameters decide how much resource to
 * preallocate for this.  Keep PERCPU_DYNAMIC_RESERVE equal to or
 * larger than PERCPU_DYNAMIC_EARLY_SIZE.
 */

#define PERCPU_DYNAMIC_EARLY_SLOTS	128

#define PERCPU_DYNAMIC_EARLY_SIZE	(12 << 10)

/*
 * PERCPU_DYNAMIC_RESERVE indicates the amount of free area to piggy
 * back on the first chunk for dynamic percpu allocation if arch is
 * manually allocating and mapping it for faster access (as a part of
 * large page mapping for example).
 *
 * The following values give between one and two pages of free space
 * after typical minimal boot (2-way SMP, single disk and NIC) with
 * both defconfig and a distro config on x86_64 and 32.  More
 * intelligent way to determine this would be nice.
 */
#if BITS_PER_LONG > 32

#define PERCPU_DYNAMIC_RESERVE		(28 << 10)
#else

#define PERCPU_DYNAMIC_RESERVE		(20 << 10)
#endif

extern void *pcpu_base_addr;
extern const unsigned long *pcpu_unit_offsets;


struct pcpu_group_info {
	
int			nr_units;	/* aligned # of units */
	
unsigned long		base_offset;	/* base address offset */
	
unsigned int		*cpu_map;	/* unit->cpu map, empty
                                                 * entries contain NR_CPUS */
};


struct pcpu_alloc_info {
	
size_t			static_size;
	
size_t			reserved_size;
	
size_t			dyn_size;
	
size_t			unit_size;
	
size_t			atom_size;
	
size_t			alloc_size;
	
size_t			__ai_size;	/* internal, don't use */
	
int			nr_groups;	/* 0 if grouping unnecessary */
	
struct pcpu_group_info	groups[];
};


enum pcpu_fc {
	
PCPU_FC_AUTO,
	
PCPU_FC_EMBED,
	
PCPU_FC_PAGE,

	
PCPU_FC_NR,
};
extern const char * const pcpu_fc_names[PCPU_FC_NR];

extern enum pcpu_fc pcpu_chosen_fc;


typedef void * (*pcpu_fc_alloc_fn_t)(unsigned int cpu, size_t size,
				     size_t align);

typedef void (*pcpu_fc_free_fn_t)(void *ptr, size_t size);

typedef void (*pcpu_fc_populate_pte_fn_t)(unsigned long addr);

typedef int (pcpu_fc_cpu_distance_fn_t)(unsigned int from, unsigned int to);

extern struct pcpu_alloc_info * __init pcpu_alloc_alloc_info(int nr_groups,
							     int nr_units);
extern void __init pcpu_free_alloc_info(struct pcpu_alloc_info *ai);

extern int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
					 void *base_addr);

#ifdef CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK
extern int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size,
				size_t atom_size,
				pcpu_fc_cpu_distance_fn_t cpu_distance_fn,
				pcpu_fc_alloc_fn_t alloc_fn,
				pcpu_fc_free_fn_t free_fn);
#endif

#ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK
extern int __init pcpu_page_first_chunk(size_t reserved_size,
				pcpu_fc_alloc_fn_t alloc_fn,
				pcpu_fc_free_fn_t free_fn,
				pcpu_fc_populate_pte_fn_t populate_pte_fn);
#endif

extern void __percpu *__alloc_reserved_percpu(size_t size, size_t align);
extern bool is_kernel_percpu_address(unsigned long addr);

#if !defined(CONFIG_SMP) || !defined(CONFIG_HAVE_SETUP_PER_CPU_AREA)
extern void __init setup_per_cpu_areas(void);
#endif
extern void __init percpu_init_late(void);

extern void __percpu *__alloc_percpu_gfp(size_t size, size_t align, gfp_t gfp);
extern void __percpu *__alloc_percpu(size_t size, size_t align);
extern void free_percpu(void __percpu *__pdata);
extern phys_addr_t per_cpu_ptr_to_phys(void *addr);


#define alloc_percpu_gfp(type, gfp)					\
	(typeof(type) __percpu *)__alloc_percpu_gfp(sizeof(type),       \
                                                __alignof__(type), gfp)

#define alloc_percpu(type)						\
	(typeof(type) __percpu *)__alloc_percpu(sizeof(type),           \
                                                __alignof__(type))

#endif /* __LINUX_PERCPU_H */
Overall Contributors
Person Tokens Prop Commits CommitProp
tejun heo tejun heo 399 88.86% 27 69.23%
jeremy fitzhardinge jeremy fitzhardinge 14 3.12% 1 2.56%
rusty russell rusty russell 13 2.90% 2 5.13%
andrew morton andrew morton 11 2.45% 3 7.69%
sasha levin sasha levin 3 0.67% 1 2.56%
steven rostedt steven rostedt 3 0.67% 1 2.56%
christoph lameter christoph lameter 2 0.45% 1 2.56%
martin peschke martin peschke 2 0.45% 1 2.56%
andi kleen andi kleen 1 0.22% 1 2.56%
robert p. j. day robert p. j. day 1 0.22% 1 2.56%
Total 449 100.00% 39 100.00%
  Directory: include/linux

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.

	Person	Tokens	Prop	Commits	CommitProp
tejun heo	tejun heo	399	88.86%	27	69.23%
jeremy fitzhardinge	jeremy fitzhardinge	14	3.12%	1	2.56%
rusty russell	rusty russell	13	2.90%	2	5.13%
andrew morton	andrew morton	11	2.45%	3	7.69%
sasha levin	sasha levin	3	0.67%	1	2.56%
steven rostedt	steven rostedt	3	0.67%	1	2.56%
christoph lameter	christoph lameter	2	0.45%	1	2.56%
martin peschke	martin peschke	2	0.45%	1	2.56%
andi kleen	andi kleen	1	0.22%	1	2.56%
robert p. j. day	robert p. j. day	1	0.22%	1	2.56%
	Total	449	100.00%	39	100.00%

cregit-Linux how code gets into the kernel

Release 4.7 include/linux/percpu.h

Overall Contributors