fs/fscache/stats.c

   1 /* FS-Cache statistics
   2  *
   3  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11
  12 #define FSCACHE_DEBUG_LEVEL THREAD
  13 #include <linux/module.h>
  14 #include <linux/proc_fs.h>
  15 #include <linux/seq_file.h>
  16 #include "internal.h"
  17
  18 /*
  19  * operation counters
  20  */
  21 atomic_t fscache_n_op_pend;
  22 atomic_t fscache_n_op_run;
  23 atomic_t fscache_n_op_enqueue;
  24 atomic_t fscache_n_op_requeue;
  25 atomic_t fscache_n_op_deferred_release;
  26 atomic_t fscache_n_op_release;
  27 atomic_t fscache_n_op_gc;
  28
  29 atomic_t fscache_n_attr_changed;
  30 atomic_t fscache_n_attr_changed_ok;
  31 atomic_t fscache_n_attr_changed_nobufs;
  32 atomic_t fscache_n_attr_changed_nomem;
  33 atomic_t fscache_n_attr_changed_calls;
  34
  35 atomic_t fscache_n_allocs;
  36 atomic_t fscache_n_allocs_ok;
  37 atomic_t fscache_n_allocs_wait;
  38 atomic_t fscache_n_allocs_nobufs;
  39 atomic_t fscache_n_alloc_ops;
  40 atomic_t fscache_n_alloc_op_waits;
  41
  42 atomic_t fscache_n_retrievals;
  43 atomic_t fscache_n_retrievals_ok;
  44 atomic_t fscache_n_retrievals_wait;
  45 atomic_t fscache_n_retrievals_nodata;
  46 atomic_t fscache_n_retrievals_nobufs;
  47 atomic_t fscache_n_retrievals_intr;
  48 atomic_t fscache_n_retrievals_nomem;
  49 atomic_t fscache_n_retrieval_ops;
  50 atomic_t fscache_n_retrieval_op_waits;
  51
  52 atomic_t fscache_n_stores;
  53 atomic_t fscache_n_stores_ok;
  54 atomic_t fscache_n_stores_again;
  55 atomic_t fscache_n_stores_nobufs;
  56 atomic_t fscache_n_stores_oom;
  57 atomic_t fscache_n_store_ops;
  58 atomic_t fscache_n_store_calls;
  59
  60 atomic_t fscache_n_marks;
  61 atomic_t fscache_n_uncaches;
  62
  63 atomic_t fscache_n_acquires;
  64 atomic_t fscache_n_acquires_null;
  65 atomic_t fscache_n_acquires_no_cache;
  66 atomic_t fscache_n_acquires_ok;
  67 atomic_t fscache_n_acquires_nobufs;
  68 atomic_t fscache_n_acquires_oom;
  69
  70 atomic_t fscache_n_updates;
  71 atomic_t fscache_n_updates_null;
  72 atomic_t fscache_n_updates_run;
  73
  74 atomic_t fscache_n_relinquishes;
  75 atomic_t fscache_n_relinquishes_null;
  76 atomic_t fscache_n_relinquishes_waitcrt;
  77
  78 atomic_t fscache_n_cookie_index;
  79 atomic_t fscache_n_cookie_data;
  80 atomic_t fscache_n_cookie_special;
  81
  82 atomic_t fscache_n_object_alloc;
  83 atomic_t fscache_n_object_no_alloc;
  84 atomic_t fscache_n_object_lookups;
  85 atomic_t fscache_n_object_lookups_negative;
  86 atomic_t fscache_n_object_lookups_positive;
  87 atomic_t fscache_n_object_created;
  88 atomic_t fscache_n_object_avail;
  89 atomic_t fscache_n_object_dead;
  90
  91 atomic_t fscache_n_checkaux_none;
  92 atomic_t fscache_n_checkaux_okay;
  93 atomic_t fscache_n_checkaux_update;
  94 atomic_t fscache_n_checkaux_obsolete;
  95
  96 /*
  97  * display the general statistics
  98  */
  99 static int fscache_stats_show(struct seq_file *m, void *v)
 100 {
 101         seq_puts(m, "FS-Cache statistics\n");
 102
 103         seq_printf(m, "Cookies: idx=%u dat=%u spc=%u\n",
 104                    atomic_read(&fscache_n_cookie_index),
 105                    atomic_read(&fscache_n_cookie_data),
 106                    atomic_read(&fscache_n_cookie_special));
 107
 108         seq_printf(m, "Objects: alc=%u nal=%u avl=%u ded=%u\n",
 109                    atomic_read(&fscache_n_object_alloc),
 110                    atomic_read(&fscache_n_object_no_alloc),
 111                    atomic_read(&fscache_n_object_avail),
 112                    atomic_read(&fscache_n_object_dead));
 113         seq_printf(m, "ChkAux : non=%u ok=%u upd=%u obs=%u\n",
 114                    atomic_read(&fscache_n_checkaux_none),
 115                    atomic_read(&fscache_n_checkaux_okay),
 116                    atomic_read(&fscache_n_checkaux_update),
 117                    atomic_read(&fscache_n_checkaux_obsolete));
 118
 119         seq_printf(m, "Pages  : mrk=%u unc=%u\n",
 120                    atomic_read(&fscache_n_marks),
 121                    atomic_read(&fscache_n_uncaches));
 122
 123         seq_printf(m, "Acquire: n=%u nul=%u noc=%u ok=%u nbf=%u"
 124                    " oom=%u\n",
 125                    atomic_read(&fscache_n_acquires),
 126                    atomic_read(&fscache_n_acquires_null),
 127                    atomic_read(&fscache_n_acquires_no_cache),
 128                    atomic_read(&fscache_n_acquires_ok),
 129                    atomic_read(&fscache_n_acquires_nobufs),
 130                    atomic_read(&fscache_n_acquires_oom));
 131
 132         seq_printf(m, "Lookups: n=%u neg=%u pos=%u crt=%u\n",
 133                    atomic_read(&fscache_n_object_lookups),
 134                    atomic_read(&fscache_n_object_lookups_negative),
 135                    atomic_read(&fscache_n_object_lookups_positive),
 136                    atomic_read(&fscache_n_object_created));
 137
 138         seq_printf(m, "Updates: n=%u nul=%u run=%u\n",
 139                    atomic_read(&fscache_n_updates),
 140                    atomic_read(&fscache_n_updates_null),
 141                    atomic_read(&fscache_n_updates_run));
 142
 143         seq_printf(m, "Relinqs: n=%u nul=%u wcr=%u\n",
 144                    atomic_read(&fscache_n_relinquishes),
 145                    atomic_read(&fscache_n_relinquishes_null),
 146                    atomic_read(&fscache_n_relinquishes_waitcrt));
 147
 148         seq_printf(m, "AttrChg: n=%u ok=%u nbf=%u oom=%u run=%u\n",
 149                    atomic_read(&fscache_n_attr_changed),
 150                    atomic_read(&fscache_n_attr_changed_ok),
 151                    atomic_read(&fscache_n_attr_changed_nobufs),
 152                    atomic_read(&fscache_n_attr_changed_nomem),
 153                    atomic_read(&fscache_n_attr_changed_calls));
 154
 155         seq_printf(m, "Allocs : n=%u ok=%u wt=%u nbf=%u\n",
 156                    atomic_read(&fscache_n_allocs),
 157                    atomic_read(&fscache_n_allocs_ok),
 158                    atomic_read(&fscache_n_allocs_wait),
 159                    atomic_read(&fscache_n_allocs_nobufs));
 160         seq_printf(m, "Allocs : ops=%u owt=%u\n",
 161                    atomic_read(&fscache_n_alloc_ops),
 162                    atomic_read(&fscache_n_alloc_op_waits));
 163
 164         seq_printf(m, "Retrvls: n=%u ok=%u wt=%u nod=%u nbf=%u"
 165                    " int=%u oom=%u\n",
 166                    atomic_read(&fscache_n_retrievals),
 167                    atomic_read(&fscache_n_retrievals_ok),
 168                    atomic_read(&fscache_n_retrievals_wait),
 169                    atomic_read(&fscache_n_retrievals_nodata),
 170                    atomic_read(&fscache_n_retrievals_nobufs),
 171                    atomic_read(&fscache_n_retrievals_intr),
 172                    atomic_read(&fscache_n_retrievals_nomem));
 173         seq_printf(m, "Retrvls: ops=%u owt=%u\n",
 174                    atomic_read(&fscache_n_retrieval_ops),
 175                    atomic_read(&fscache_n_retrieval_op_waits));
 176
 177         seq_printf(m, "Stores : n=%u ok=%u agn=%u nbf=%u oom=%u\n",
 178                    atomic_read(&fscache_n_stores),
 179                    atomic_read(&fscache_n_stores_ok),
 180                    atomic_read(&fscache_n_stores_again),
 181                    atomic_read(&fscache_n_stores_nobufs),
 182                    atomic_read(&fscache_n_stores_oom));
 183         seq_printf(m, "Stores : ops=%u run=%u\n",
 184                    atomic_read(&fscache_n_store_ops),
 185                    atomic_read(&fscache_n_store_calls));
 186
 187         seq_printf(m, "Ops    : pend=%u run=%u enq=%u\n",
 188                    atomic_read(&fscache_n_op_pend),
 189                    atomic_read(&fscache_n_op_run),
 190                    atomic_read(&fscache_n_op_enqueue));
 191         seq_printf(m, "Ops    : dfr=%u rel=%u gc=%u\n",
 192                    atomic_read(&fscache_n_op_deferred_release),
 193                    atomic_read(&fscache_n_op_release),
 194                    atomic_read(&fscache_n_op_gc));
 195         return 0;
 196 }
 197
 198 /*
 199  * open "/proc/fs/fscache/stats" allowing provision of a statistical summary
 200  */
 201 static int fscache_stats_open(struct inode *inode, struct file *file)
 202 {
 203         return single_open(file, fscache_stats_show, NULL);
 204 }
 205
 206 const struct file_operations fscache_stats_fops = {
 207         .owner          = THIS_MODULE,
 208         .open           = fscache_stats_open,
 209         .read           = seq_read,
 210         .llseek         = seq_lseek,
 211         .release        = seq_release,
 212 };