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   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 atomic_t fscache_n_op_cancelled;
  29 atomic_t fscache_n_op_rejected;
  30
  31 atomic_t fscache_n_attr_changed;
  32 atomic_t fscache_n_attr_changed_ok;
  33 atomic_t fscache_n_attr_changed_nobufs;
  34 atomic_t fscache_n_attr_changed_nomem;
  35 atomic_t fscache_n_attr_changed_calls;
  36
  37 atomic_t fscache_n_allocs;
  38 atomic_t fscache_n_allocs_ok;
  39 atomic_t fscache_n_allocs_wait;
  40 atomic_t fscache_n_allocs_nobufs;
  41 atomic_t fscache_n_allocs_intr;
  42 atomic_t fscache_n_allocs_object_dead;
  43 atomic_t fscache_n_alloc_ops;
  44 atomic_t fscache_n_alloc_op_waits;
  45
  46 atomic_t fscache_n_retrievals;
  47 atomic_t fscache_n_retrievals_ok;
  48 atomic_t fscache_n_retrievals_wait;
  49 atomic_t fscache_n_retrievals_nodata;
  50 atomic_t fscache_n_retrievals_nobufs;
  51 atomic_t fscache_n_retrievals_intr;
  52 atomic_t fscache_n_retrievals_nomem;
  53 atomic_t fscache_n_retrievals_object_dead;
  54 atomic_t fscache_n_retrieval_ops;
  55 atomic_t fscache_n_retrieval_op_waits;
  56
  57 atomic_t fscache_n_stores;
  58 atomic_t fscache_n_stores_ok;
  59 atomic_t fscache_n_stores_again;
  60 atomic_t fscache_n_stores_nobufs;
  61 atomic_t fscache_n_stores_oom;
  62 atomic_t fscache_n_store_ops;
  63 atomic_t fscache_n_store_calls;
  64 atomic_t fscache_n_store_pages;
  65 atomic_t fscache_n_store_radix_deletes;
  66 atomic_t fscache_n_store_pages_over_limit;
  67
  68 atomic_t fscache_n_store_vmscan_not_storing;
  69 atomic_t fscache_n_store_vmscan_gone;
  70 atomic_t fscache_n_store_vmscan_busy;
  71 atomic_t fscache_n_store_vmscan_cancelled;
  72
  73 atomic_t fscache_n_marks;
  74 atomic_t fscache_n_uncaches;
  75
  76 atomic_t fscache_n_acquires;
  77 atomic_t fscache_n_acquires_null;
  78 atomic_t fscache_n_acquires_no_cache;
  79 atomic_t fscache_n_acquires_ok;
  80 atomic_t fscache_n_acquires_nobufs;
  81 atomic_t fscache_n_acquires_oom;
  82
  83 atomic_t fscache_n_updates;
  84 atomic_t fscache_n_updates_null;
  85 atomic_t fscache_n_updates_run;
  86
  87 atomic_t fscache_n_relinquishes;
  88 atomic_t fscache_n_relinquishes_null;
  89 atomic_t fscache_n_relinquishes_waitcrt;
  90 atomic_t fscache_n_relinquishes_retire;
  91
  92 atomic_t fscache_n_cookie_index;
  93 atomic_t fscache_n_cookie_data;
  94 atomic_t fscache_n_cookie_special;
  95
  96 atomic_t fscache_n_object_alloc;
  97 atomic_t fscache_n_object_no_alloc;
  98 atomic_t fscache_n_object_lookups;
  99 atomic_t fscache_n_object_lookups_negative;
 100 atomic_t fscache_n_object_lookups_positive;
 101 atomic_t fscache_n_object_created;
 102 atomic_t fscache_n_object_avail;
 103 atomic_t fscache_n_object_dead;
 104
 105 atomic_t fscache_n_checkaux_none;
 106 atomic_t fscache_n_checkaux_okay;
 107 atomic_t fscache_n_checkaux_update;
 108 atomic_t fscache_n_checkaux_obsolete;
 109
 110 atomic_t fscache_n_cop_alloc_object;
 111 atomic_t fscache_n_cop_lookup_object;
 112 atomic_t fscache_n_cop_lookup_complete;
 113 atomic_t fscache_n_cop_grab_object;
 114 atomic_t fscache_n_cop_update_object;
 115 atomic_t fscache_n_cop_drop_object;
 116 atomic_t fscache_n_cop_put_object;
 117 atomic_t fscache_n_cop_sync_cache;
 118 atomic_t fscache_n_cop_attr_changed;
 119 atomic_t fscache_n_cop_read_or_alloc_page;
 120 atomic_t fscache_n_cop_read_or_alloc_pages;
 121 atomic_t fscache_n_cop_allocate_page;
 122 atomic_t fscache_n_cop_allocate_pages;
 123 atomic_t fscache_n_cop_write_page;
 124 atomic_t fscache_n_cop_uncache_page;
 125 atomic_t fscache_n_cop_dissociate_pages;
 126
 127 /*
 128  * display the general statistics
 129  */
 130 static int fscache_stats_show(struct seq_file *m, void *v)
 131 {
 132         seq_puts(m, "FS-Cache statistics\n");
 133
 134         seq_printf(m, "Cookies: idx=%u dat=%u spc=%u\n",
 135                    atomic_read(&fscache_n_cookie_index),
 136                    atomic_read(&fscache_n_cookie_data),
 137                    atomic_read(&fscache_n_cookie_special));
 138
 139         seq_printf(m, "Objects: alc=%u nal=%u avl=%u ded=%u\n",
 140                    atomic_read(&fscache_n_object_alloc),
 141                    atomic_read(&fscache_n_object_no_alloc),
 142                    atomic_read(&fscache_n_object_avail),
 143                    atomic_read(&fscache_n_object_dead));
 144         seq_printf(m, "ChkAux : non=%u ok=%u upd=%u obs=%u\n",
 145                    atomic_read(&fscache_n_checkaux_none),
 146                    atomic_read(&fscache_n_checkaux_okay),
 147                    atomic_read(&fscache_n_checkaux_update),
 148                    atomic_read(&fscache_n_checkaux_obsolete));
 149
 150         seq_printf(m, "Pages  : mrk=%u unc=%u\n",
 151                    atomic_read(&fscache_n_marks),
 152                    atomic_read(&fscache_n_uncaches));
 153
 154         seq_printf(m, "Acquire: n=%u nul=%u noc=%u ok=%u nbf=%u"
 155                    " oom=%u\n",
 156                    atomic_read(&fscache_n_acquires),
 157                    atomic_read(&fscache_n_acquires_null),
 158                    atomic_read(&fscache_n_acquires_no_cache),
 159                    atomic_read(&fscache_n_acquires_ok),
 160                    atomic_read(&fscache_n_acquires_nobufs),
 161                    atomic_read(&fscache_n_acquires_oom));
 162
 163         seq_printf(m, "Lookups: n=%u neg=%u pos=%u crt=%u\n",
 164                    atomic_read(&fscache_n_object_lookups),
 165                    atomic_read(&fscache_n_object_lookups_negative),
 166                    atomic_read(&fscache_n_object_lookups_positive),
 167                    atomic_read(&fscache_n_object_created));
 168
 169         seq_printf(m, "Updates: n=%u nul=%u run=%u\n",
 170                    atomic_read(&fscache_n_updates),
 171                    atomic_read(&fscache_n_updates_null),
 172                    atomic_read(&fscache_n_updates_run));
 173
 174         seq_printf(m, "Relinqs: n=%u nul=%u wcr=%u rtr=%u\n",
 175                    atomic_read(&fscache_n_relinquishes),
 176                    atomic_read(&fscache_n_relinquishes_null),
 177                    atomic_read(&fscache_n_relinquishes_waitcrt),
 178                    atomic_read(&fscache_n_relinquishes_retire));
 179
 180         seq_printf(m, "AttrChg: n=%u ok=%u nbf=%u oom=%u run=%u\n",
 181                    atomic_read(&fscache_n_attr_changed),
 182                    atomic_read(&fscache_n_attr_changed_ok),
 183                    atomic_read(&fscache_n_attr_changed_nobufs),
 184                    atomic_read(&fscache_n_attr_changed_nomem),
 185                    atomic_read(&fscache_n_attr_changed_calls));
 186
 187         seq_printf(m, "Allocs : n=%u ok=%u wt=%u nbf=%u int=%u\n",
 188                    atomic_read(&fscache_n_allocs),
 189                    atomic_read(&fscache_n_allocs_ok),
 190                    atomic_read(&fscache_n_allocs_wait),
 191                    atomic_read(&fscache_n_allocs_nobufs),
 192                    atomic_read(&fscache_n_allocs_intr));
 193         seq_printf(m, "Allocs : ops=%u owt=%u abt=%u\n",
 194                    atomic_read(&fscache_n_alloc_ops),
 195                    atomic_read(&fscache_n_alloc_op_waits),
 196                    atomic_read(&fscache_n_allocs_object_dead));
 197
 198         seq_printf(m, "Retrvls: n=%u ok=%u wt=%u nod=%u nbf=%u"
 199                    " int=%u oom=%u\n",
 200                    atomic_read(&fscache_n_retrievals),
 201                    atomic_read(&fscache_n_retrievals_ok),
 202                    atomic_read(&fscache_n_retrievals_wait),
 203                    atomic_read(&fscache_n_retrievals_nodata),
 204                    atomic_read(&fscache_n_retrievals_nobufs),
 205                    atomic_read(&fscache_n_retrievals_intr),
 206                    atomic_read(&fscache_n_retrievals_nomem));
 207         seq_printf(m, "Retrvls: ops=%u owt=%u abt=%u\n",
 208                    atomic_read(&fscache_n_retrieval_ops),
 209                    atomic_read(&fscache_n_retrieval_op_waits),
 210                    atomic_read(&fscache_n_retrievals_object_dead));
 211
 212         seq_printf(m, "Stores : n=%u ok=%u agn=%u nbf=%u oom=%u\n",
 213                    atomic_read(&fscache_n_stores),
 214                    atomic_read(&fscache_n_stores_ok),
 215                    atomic_read(&fscache_n_stores_again),
 216                    atomic_read(&fscache_n_stores_nobufs),
 217                    atomic_read(&fscache_n_stores_oom));
 218         seq_printf(m, "Stores : ops=%u run=%u pgs=%u rxd=%u olm=%u\n",
 219                    atomic_read(&fscache_n_store_ops),
 220                    atomic_read(&fscache_n_store_calls),
 221                    atomic_read(&fscache_n_store_pages),
 222                    atomic_read(&fscache_n_store_radix_deletes),
 223                    atomic_read(&fscache_n_store_pages_over_limit));
 224
 225         seq_printf(m, "VmScan : nos=%u gon=%u bsy=%u can=%u\n",
 226                    atomic_read(&fscache_n_store_vmscan_not_storing),
 227                    atomic_read(&fscache_n_store_vmscan_gone),
 228                    atomic_read(&fscache_n_store_vmscan_busy),
 229                    atomic_read(&fscache_n_store_vmscan_cancelled));
 230
 231         seq_printf(m, "Ops    : pend=%u run=%u enq=%u can=%u rej=%u\n",
 232                    atomic_read(&fscache_n_op_pend),
 233                    atomic_read(&fscache_n_op_run),
 234                    atomic_read(&fscache_n_op_enqueue),
 235                    atomic_read(&fscache_n_op_cancelled),
 236                    atomic_read(&fscache_n_op_rejected));
 237         seq_printf(m, "Ops    : dfr=%u rel=%u gc=%u\n",
 238                    atomic_read(&fscache_n_op_deferred_release),
 239                    atomic_read(&fscache_n_op_release),
 240                    atomic_read(&fscache_n_op_gc));
 241
 242         seq_printf(m, "CacheOp: alo=%d luo=%d luc=%d gro=%d\n",
 243                    atomic_read(&fscache_n_cop_alloc_object),
 244                    atomic_read(&fscache_n_cop_lookup_object),
 245                    atomic_read(&fscache_n_cop_lookup_complete),
 246                    atomic_read(&fscache_n_cop_grab_object));
 247         seq_printf(m, "CacheOp: upo=%d dro=%d pto=%d atc=%d syn=%d\n",
 248                    atomic_read(&fscache_n_cop_update_object),
 249                    atomic_read(&fscache_n_cop_drop_object),
 250                    atomic_read(&fscache_n_cop_put_object),
 251                    atomic_read(&fscache_n_cop_attr_changed),
 252                    atomic_read(&fscache_n_cop_sync_cache));
 253         seq_printf(m, "CacheOp: rap=%d ras=%d alp=%d als=%d wrp=%d ucp=%d dsp=%d\n",
 254                    atomic_read(&fscache_n_cop_read_or_alloc_page),
 255                    atomic_read(&fscache_n_cop_read_or_alloc_pages),
 256                    atomic_read(&fscache_n_cop_allocate_page),
 257                    atomic_read(&fscache_n_cop_allocate_pages),
 258                    atomic_read(&fscache_n_cop_write_page),
 259                    atomic_read(&fscache_n_cop_uncache_page),
 260                    atomic_read(&fscache_n_cop_dissociate_pages));
 261         return 0;
 262 }
 263
 264 /*
 265  * open "/proc/fs/fscache/stats" allowing provision of a statistical summary
 266  */
 267 static int fscache_stats_open(struct inode *inode, struct file *file)
 268 {
 269         return single_open(file, fscache_stats_show, NULL);
 270 }
 271
 272 const struct file_operations fscache_stats_fops = {
 273         .owner          = THIS_MODULE,
 274         .open           = fscache_stats_open,
 275         .read           = seq_read,
 276         .llseek         = seq_lseek,
 277         .release        = seq_release,
 278 };