fs/netfs/fscache_stats.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* FS-Cache statistics
   3  *
   4  * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
   5  * Written by David Howells (dhowells@redhat.com)
   6  */
   7
   8 #define FSCACHE_DEBUG_LEVEL CACHE
   9 #include <linux/proc_fs.h>
  10 #include <linux/seq_file.h>
  11 #include "internal.h"
  12
  13 /*
  14  * operation counters
  15  */
  16 atomic_t fscache_n_volumes;
  17 atomic_t fscache_n_volumes_collision;
  18 atomic_t fscache_n_volumes_nomem;
  19 atomic_t fscache_n_cookies;
  20 atomic_t fscache_n_cookies_lru;
  21 atomic_t fscache_n_cookies_lru_expired;
  22 atomic_t fscache_n_cookies_lru_removed;
  23 atomic_t fscache_n_cookies_lru_dropped;
  24
  25 atomic_t fscache_n_acquires;
  26 atomic_t fscache_n_acquires_ok;
  27 atomic_t fscache_n_acquires_oom;
  28
  29 atomic_t fscache_n_invalidates;
  30
  31 atomic_t fscache_n_updates;
  32 EXPORT_SYMBOL(fscache_n_updates);
  33
  34 atomic_t fscache_n_relinquishes;
  35 atomic_t fscache_n_relinquishes_retire;
  36 atomic_t fscache_n_relinquishes_dropped;
  37
  38 atomic_t fscache_n_resizes;
  39 atomic_t fscache_n_resizes_null;
  40
  41 atomic_t fscache_n_read;
  42 EXPORT_SYMBOL(fscache_n_read);
  43 atomic_t fscache_n_write;
  44 EXPORT_SYMBOL(fscache_n_write);
  45 atomic_t fscache_n_no_write_space;
  46 EXPORT_SYMBOL(fscache_n_no_write_space);
  47 atomic_t fscache_n_no_create_space;
  48 EXPORT_SYMBOL(fscache_n_no_create_space);
  49 atomic_t fscache_n_culled;
  50 EXPORT_SYMBOL(fscache_n_culled);
  51 atomic_t fscache_n_dio_misfit;
  52 EXPORT_SYMBOL(fscache_n_dio_misfit);
  53
  54 /*
  55  * display the general statistics
  56  */
  57 int fscache_stats_show(struct seq_file *m)
  58 {
  59         seq_puts(m, "-- FS-Cache statistics --\n");
  60         seq_printf(m, "Cookies: n=%d v=%d vcol=%u voom=%u\n",
  61                    atomic_read(&fscache_n_cookies),
  62                    atomic_read(&fscache_n_volumes),
  63                    atomic_read(&fscache_n_volumes_collision),
  64                    atomic_read(&fscache_n_volumes_nomem)
  65                    );
  66
  67         seq_printf(m, "Acquire: n=%u ok=%u oom=%u\n",
  68                    atomic_read(&fscache_n_acquires),
  69                    atomic_read(&fscache_n_acquires_ok),
  70                    atomic_read(&fscache_n_acquires_oom));
  71
  72         seq_printf(m, "LRU    : n=%u exp=%u rmv=%u drp=%u at=%ld\n",
  73                    atomic_read(&fscache_n_cookies_lru),
  74                    atomic_read(&fscache_n_cookies_lru_expired),
  75                    atomic_read(&fscache_n_cookies_lru_removed),
  76                    atomic_read(&fscache_n_cookies_lru_dropped),
  77                    timer_pending(&fscache_cookie_lru_timer) ?
  78                    fscache_cookie_lru_timer.expires - jiffies : 0);
  79
  80         seq_printf(m, "Invals : n=%u\n",
  81                    atomic_read(&fscache_n_invalidates));
  82
  83         seq_printf(m, "Updates: n=%u rsz=%u rsn=%u\n",
  84                    atomic_read(&fscache_n_updates),
  85                    atomic_read(&fscache_n_resizes),
  86                    atomic_read(&fscache_n_resizes_null));
  87
  88         seq_printf(m, "Relinqs: n=%u rtr=%u drop=%u\n",
  89                    atomic_read(&fscache_n_relinquishes),
  90                    atomic_read(&fscache_n_relinquishes_retire),
  91                    atomic_read(&fscache_n_relinquishes_dropped));
  92
  93         seq_printf(m, "NoSpace: nwr=%u ncr=%u cull=%u\n",
  94                    atomic_read(&fscache_n_no_write_space),
  95                    atomic_read(&fscache_n_no_create_space),
  96                    atomic_read(&fscache_n_culled));
  97
  98         seq_printf(m, "IO     : rd=%u wr=%u mis=%u\n",
  99                    atomic_read(&fscache_n_read),
 100                    atomic_read(&fscache_n_write),
 101                    atomic_read(&fscache_n_dio_misfit));
 102         return 0;
 103 }