linux/mm/percpu-stats.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * mm/percpu-debug.c
 *
 * Copyright (C) 2017		Facebook Inc.
 * Copyright (C) 2017		Dennis Zhou <[email protected]>
 *
 * Prints statistics about the percpu allocator and backing chunks.
 */
#include <linux/debugfs.h>
#include <linux/list.h>
#include <linux/percpu.h>
#include <linux/seq_file.h>
#include <linux/sort.h>
#include <linux/vmalloc.h>

#include "percpu-internal.h"

#define P(X, Y) …

struct percpu_stats pcpu_stats;
struct pcpu_alloc_info pcpu_stats_ai;

static int cmpint(const void *a, const void *b)
{ … }

/*
 * Iterates over all chunks to find the max nr_alloc entries.
 */
static int find_max_nr_alloc(void)
{ … }

/*
 * Prints out chunk state. Fragmentation is considered between
 * the beginning of the chunk to the last allocation.
 *
 * All statistics are in bytes unless stated otherwise.
 */
static void chunk_map_stats(struct seq_file *m, struct pcpu_chunk *chunk,
			    int *buffer)
{ … }

static int percpu_stats_show(struct seq_file *m, void *v)
{ … }
DEFINE_SHOW_ATTRIBUTE(…);

static int __init init_percpu_stats_debugfs(void)
{ … }

late_initcall(init_percpu_stats_debugfs);