linux-imx

/*

 * mm/percpu-debug.c

 *

 * Copyright (C) 2017       Facebook Inc.

 * Copyright (C) 2017       Dennis Zhou <dennisz@fb.com>

 *

 * This file is released under the GPLv2.

 *

 * 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) \

    seq_printf(m, "  %-20s: %12lld\n", X, (long long int)Y)

​

struct percpu_stats pcpu_stats;

struct pcpu_alloc_info pcpu_stats_ai;

​

static int cmpint(const void *a, const void *b)

{

    return *(int *)a - *(int *)b;

}

​

/*

 * Iterates over all chunks to find the max nr_alloc entries.

 */

static int find_max_nr_alloc(void)

{

    struct pcpu_chunk *chunk;

    int slot, max_nr_alloc;

​

    max_nr_alloc = 0;

    for (slot = 0; slot < pcpu_nr_slots; slot++)

        list_for_each_entry(chunk, &pcpu_slot[slot], list)

            max_nr_alloc = max(max_nr_alloc, chunk->nr_alloc);

​

    return max_nr_alloc;

}

​

/*

 * 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)

{

    int i, last_alloc, as_len, start, end;

    int *alloc_sizes, *p;

    /* statistics */

    int sum_frag = 0, max_frag = 0;

    int cur_min_alloc = 0, cur_med_alloc = 0, cur_max_alloc = 0;

​

    alloc_sizes = buffer;

​