linux/mm/percpu-internal.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _MM_PERCPU_INTERNAL_H
#define _MM_PERCPU_INTERNAL_H

#include <linux/types.h>
#include <linux/percpu.h>
#include <linux/memcontrol.h>

/*
 * pcpu_block_md is the metadata block struct.
 * Each chunk's bitmap is split into a number of full blocks.
 * All units are in terms of bits.
 *
 * The scan hint is the largest known contiguous area before the contig hint.
 * It is not necessarily the actual largest contig hint though.  There is an
 * invariant that the scan_hint_start > contig_hint_start iff
 * scan_hint == contig_hint.  This is necessary because when scanning forward,
 * we don't know if a new contig hint would be better than the current one.
 */
struct pcpu_block_md { … };

struct pcpuobj_ext { … };

#if defined(CONFIG_MEMCG) || defined(CONFIG_MEM_ALLOC_PROFILING)
#define NEED_PCPUOBJ_EXT
#endif

struct pcpu_chunk { … };

static inline bool need_pcpuobj_ext(void)
{ … }

extern spinlock_t pcpu_lock;

extern struct list_head *pcpu_chunk_lists;
extern int pcpu_nr_slots;
extern int pcpu_sidelined_slot;
extern int pcpu_to_depopulate_slot;
extern int pcpu_nr_empty_pop_pages;

extern struct pcpu_chunk *pcpu_first_chunk;
extern struct pcpu_chunk *pcpu_reserved_chunk;

/**
 * pcpu_chunk_nr_blocks - converts nr_pages to # of md_blocks
 * @chunk: chunk of interest
 *
 * This conversion is from the number of physical pages that the chunk
 * serves to the number of bitmap blocks used.
 */
static inline int pcpu_chunk_nr_blocks(struct pcpu_chunk *chunk)
{ … }

/**
 * pcpu_nr_pages_to_map_bits - converts the pages to size of bitmap
 * @pages: number of physical pages
 *
 * This conversion is from physical pages to the number of bits
 * required in the bitmap.
 */
static inline int pcpu_nr_pages_to_map_bits(int pages)
{ … }

/**
 * pcpu_chunk_map_bits - helper to convert nr_pages to size of bitmap
 * @chunk: chunk of interest
 *
 * This conversion is from the number of physical pages that the chunk
 * serves to the number of bits in the bitmap.
 */
static inline int pcpu_chunk_map_bits(struct pcpu_chunk *chunk)
{ … }

/**
 * pcpu_obj_full_size - helper to calculate size of each accounted object
 * @size: size of area to allocate in bytes
 *
 * For each accounted object there is an extra space which is used to store
 * obj_cgroup membership if kmemcg is not disabled. Charge it too.
 */
static inline size_t pcpu_obj_full_size(size_t size)
{ … }

#ifdef CONFIG_PERCPU_STATS

#include <linux/spinlock.h>

struct percpu_stats { … };

extern struct percpu_stats pcpu_stats;
extern struct pcpu_alloc_info pcpu_stats_ai;

/*
 * For debug purposes. We don't care about the flexible array.
 */
static inline void pcpu_stats_save_ai(const struct pcpu_alloc_info *ai)
{ … }

/*
 * pcpu_stats_area_alloc - increment area allocation stats
 * @chunk: the location of the area being allocated
 * @size: size of area to allocate in bytes
 *
 * CONTEXT:
 * pcpu_lock.
 */
static inline void pcpu_stats_area_alloc(struct pcpu_chunk *chunk, size_t size)
{ … }

/*
 * pcpu_stats_area_dealloc - decrement allocation stats
 * @chunk: the location of the area being deallocated
 *
 * CONTEXT:
 * pcpu_lock.
 */
static inline void pcpu_stats_area_dealloc(struct pcpu_chunk *chunk)
{ … }

/*
 * pcpu_stats_chunk_alloc - increment chunk stats
 */
static inline void pcpu_stats_chunk_alloc(void)
{ … }

/*
 * pcpu_stats_chunk_dealloc - decrement chunk stats
 */
static inline void pcpu_stats_chunk_dealloc(void)
{ … }

#else

static inline void pcpu_stats_save_ai(const struct pcpu_alloc_info *ai)
{
}

static inline void pcpu_stats_area_alloc(struct pcpu_chunk *chunk, size_t size)
{
}

static inline void pcpu_stats_area_dealloc(struct pcpu_chunk *chunk)
{
}

static inline void pcpu_stats_chunk_alloc(void)
{
}

static inline void pcpu_stats_chunk_dealloc(void)
{
}

#endif /* !CONFIG_PERCPU_STATS */

#endif