linux/fs/fscache/stats.c
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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 */
  21atomic_t fscache_n_op_pend;
  22atomic_t fscache_n_op_run;
  23atomic_t fscache_n_op_enqueue;
  24atomic_t fscache_n_op_requeue;
  25atomic_t fscache_n_op_deferred_release;
  26atomic_t fscache_n_op_release;
  27atomic_t fscache_n_op_gc;
  28atomic_t fscache_n_op_cancelled;
  29atomic_t fscache_n_op_rejected;
  30
  31atomic_t fscache_n_attr_changed;
  32atomic_t fscache_n_attr_changed_ok;
  33atomic_t fscache_n_attr_changed_nobufs;
  34atomic_t fscache_n_attr_changed_nomem;
  35atomic_t fscache_n_attr_changed_calls;
  36
  37atomic_t fscache_n_allocs;
  38atomic_t fscache_n_allocs_ok;
  39atomic_t fscache_n_allocs_wait;
  40atomic_t fscache_n_allocs_nobufs;
  41atomic_t fscache_n_allocs_intr;
  42atomic_t fscache_n_allocs_object_dead;
  43atomic_t fscache_n_alloc_ops;
  44atomic_t fscache_n_alloc_op_waits;
  45
  46atomic_t fscache_n_retrievals;
  47atomic_t fscache_n_retrievals_ok;
  48atomic_t fscache_n_retrievals_wait;
  49atomic_t fscache_n_retrievals_nodata;
  50atomic_t fscache_n_retrievals_nobufs;
  51atomic_t fscache_n_retrievals_intr;
  52atomic_t fscache_n_retrievals_nomem;
  53atomic_t fscache_n_retrievals_object_dead;
  54atomic_t fscache_n_retrieval_ops;
  55atomic_t fscache_n_retrieval_op_waits;
  56
  57atomic_t fscache_n_stores;
  58atomic_t fscache_n_stores_ok;
  59atomic_t fscache_n_stores_again;
  60atomic_t fscache_n_stores_nobufs;
  61atomic_t fscache_n_stores_oom;
  62atomic_t fscache_n_store_ops;
  63atomic_t fscache_n_store_calls;
  64atomic_t fscache_n_store_pages;
  65atomic_t fscache_n_store_radix_deletes;
  66atomic_t fscache_n_store_pages_over_limit;
  67
  68atomic_t fscache_n_store_vmscan_not_storing;
  69atomic_t fscache_n_store_vmscan_gone;
  70atomic_t fscache_n_store_vmscan_busy;
  71atomic_t fscache_n_store_vmscan_cancelled;
  72
  73atomic_t fscache_n_marks;
  74atomic_t fscache_n_uncaches;
  75
  76atomic_t fscache_n_acquires;
  77atomic_t fscache_n_acquires_null;
  78atomic_t fscache_n_acquires_no_cache;
  79atomic_t fscache_n_acquires_ok;
  80atomic_t fscache_n_acquires_nobufs;
  81atomic_t fscache_n_acquires_oom;
  82
  83atomic_t fscache_n_updates;
  84atomic_t fscache_n_updates_null;
  85atomic_t fscache_n_updates_run;
  86
  87atomic_t fscache_n_relinquishes;
  88atomic_t fscache_n_relinquishes_null;
  89atomic_t fscache_n_relinquishes_waitcrt;
  90atomic_t fscache_n_relinquishes_retire;
  91
  92atomic_t fscache_n_cookie_index;
  93atomic_t fscache_n_cookie_data;
  94atomic_t fscache_n_cookie_special;
  95
  96atomic_t fscache_n_object_alloc;
  97atomic_t fscache_n_object_no_alloc;
  98atomic_t fscache_n_object_lookups;
  99atomic_t fscache_n_object_lookups_negative;
 100atomic_t fscache_n_object_lookups_positive;
 101atomic_t fscache_n_object_lookups_timed_out;
 102atomic_t fscache_n_object_created;
 103atomic_t fscache_n_object_avail;
 104atomic_t fscache_n_object_dead;
 105
 106atomic_t fscache_n_checkaux_none;
 107atomic_t fscache_n_checkaux_okay;
 108atomic_t fscache_n_checkaux_update;
 109atomic_t fscache_n_checkaux_obsolete;
 110
 111atomic_t fscache_n_cop_alloc_object;
 112atomic_t fscache_n_cop_lookup_object;
 113atomic_t fscache_n_cop_lookup_complete;
 114atomic_t fscache_n_cop_grab_object;
 115atomic_t fscache_n_cop_update_object;
 116atomic_t fscache_n_cop_drop_object;
 117atomic_t fscache_n_cop_put_object;
 118atomic_t fscache_n_cop_sync_cache;
 119atomic_t fscache_n_cop_attr_changed;
 120atomic_t fscache_n_cop_read_or_alloc_page;
 121atomic_t fscache_n_cop_read_or_alloc_pages;
 122atomic_t fscache_n_cop_allocate_page;
 123atomic_t fscache_n_cop_allocate_pages;
 124atomic_t fscache_n_cop_write_page;
 125atomic_t fscache_n_cop_uncache_page;
 126atomic_t fscache_n_cop_dissociate_pages;
 127
 128/*
 129 * display the general statistics
 130 */
 131static int fscache_stats_show(struct seq_file *m, void *v)
 132{
 133        seq_puts(m, "FS-Cache statistics\n");
 134
 135        seq_printf(m, "Cookies: idx=%u dat=%u spc=%u\n",
 136                   atomic_read(&fscache_n_cookie_index),
 137                   atomic_read(&fscache_n_cookie_data),
 138                   atomic_read(&fscache_n_cookie_special));
 139
 140        seq_printf(m, "Objects: alc=%u nal=%u avl=%u ded=%u\n",
 141                   atomic_read(&fscache_n_object_alloc),
 142                   atomic_read(&fscache_n_object_no_alloc),
 143                   atomic_read(&fscache_n_object_avail),
 144                   atomic_read(&fscache_n_object_dead));
 145        seq_printf(m, "ChkAux : non=%u ok=%u upd=%u obs=%u\n",
 146                   atomic_read(&fscache_n_checkaux_none),
 147                   atomic_read(&fscache_n_checkaux_okay),
 148                   atomic_read(&fscache_n_checkaux_update),
 149                   atomic_read(&fscache_n_checkaux_obsolete));
 150
 151        seq_printf(m, "Pages  : mrk=%u unc=%u\n",
 152                   atomic_read(&fscache_n_marks),
 153                   atomic_read(&fscache_n_uncaches));
 154
 155        seq_printf(m, "Acquire: n=%u nul=%u noc=%u ok=%u nbf=%u"
 156                   " oom=%u\n",
 157                   atomic_read(&fscache_n_acquires),
 158                   atomic_read(&fscache_n_acquires_null),
 159                   atomic_read(&fscache_n_acquires_no_cache),
 160                   atomic_read(&fscache_n_acquires_ok),
 161                   atomic_read(&fscache_n_acquires_nobufs),
 162                   atomic_read(&fscache_n_acquires_oom));
 163
 164        seq_printf(m, "Lookups: n=%u neg=%u pos=%u crt=%u tmo=%u\n",
 165                   atomic_read(&fscache_n_object_lookups),
 166                   atomic_read(&fscache_n_object_lookups_negative),
 167                   atomic_read(&fscache_n_object_lookups_positive),
 168                   atomic_read(&fscache_n_object_created),
 169                   atomic_read(&fscache_n_object_lookups_timed_out));
 170
 171        seq_printf(m, "Updates: n=%u nul=%u run=%u\n",
 172                   atomic_read(&fscache_n_updates),
 173                   atomic_read(&fscache_n_updates_null),
 174                   atomic_read(&fscache_n_updates_run));
 175
 176        seq_printf(m, "Relinqs: n=%u nul=%u wcr=%u rtr=%u\n",
 177                   atomic_read(&fscache_n_relinquishes),
 178                   atomic_read(&fscache_n_relinquishes_null),
 179                   atomic_read(&fscache_n_relinquishes_waitcrt),
 180                   atomic_read(&fscache_n_relinquishes_retire));
 181
 182        seq_printf(m, "AttrChg: n=%u ok=%u nbf=%u oom=%u run=%u\n",
 183                   atomic_read(&fscache_n_attr_changed),
 184                   atomic_read(&fscache_n_attr_changed_ok),
 185                   atomic_read(&fscache_n_attr_changed_nobufs),
 186                   atomic_read(&fscache_n_attr_changed_nomem),
 187                   atomic_read(&fscache_n_attr_changed_calls));
 188
 189        seq_printf(m, "Allocs : n=%u ok=%u wt=%u nbf=%u int=%u\n",
 190                   atomic_read(&fscache_n_allocs),
 191                   atomic_read(&fscache_n_allocs_ok),
 192                   atomic_read(&fscache_n_allocs_wait),
 193                   atomic_read(&fscache_n_allocs_nobufs),
 194                   atomic_read(&fscache_n_allocs_intr));
 195        seq_printf(m, "Allocs : ops=%u owt=%u abt=%u\n",
 196                   atomic_read(&fscache_n_alloc_ops),
 197                   atomic_read(&fscache_n_alloc_op_waits),
 198                   atomic_read(&fscache_n_allocs_object_dead));
 199
 200        seq_printf(m, "Retrvls: n=%u ok=%u wt=%u nod=%u nbf=%u"
 201                   " int=%u oom=%u\n",
 202                   atomic_read(&fscache_n_retrievals),
 203                   atomic_read(&fscache_n_retrievals_ok),
 204                   atomic_read(&fscache_n_retrievals_wait),
 205                   atomic_read(&fscache_n_retrievals_nodata),
 206                   atomic_read(&fscache_n_retrievals_nobufs),
 207                   atomic_read(&fscache_n_retrievals_intr),
 208                   atomic_read(&fscache_n_retrievals_nomem));
 209        seq_printf(m, "Retrvls: ops=%u owt=%u abt=%u\n",
 210                   atomic_read(&fscache_n_retrieval_ops),
 211                   atomic_read(&fscache_n_retrieval_op_waits),
 212                   atomic_read(&fscache_n_retrievals_object_dead));
 213
 214        seq_printf(m, "Stores : n=%u ok=%u agn=%u nbf=%u oom=%u\n",
 215                   atomic_read(&fscache_n_stores),
 216                   atomic_read(&fscache_n_stores_ok),
 217                   atomic_read(&fscache_n_stores_again),
 218                   atomic_read(&fscache_n_stores_nobufs),
 219                   atomic_read(&fscache_n_stores_oom));
 220        seq_printf(m, "Stores : ops=%u run=%u pgs=%u rxd=%u olm=%u\n",
 221                   atomic_read(&fscache_n_store_ops),
 222                   atomic_read(&fscache_n_store_calls),
 223                   atomic_read(&fscache_n_store_pages),
 224                   atomic_read(&fscache_n_store_radix_deletes),
 225                   atomic_read(&fscache_n_store_pages_over_limit));
 226
 227        seq_printf(m, "VmScan : nos=%u gon=%u bsy=%u can=%u\n",
 228                   atomic_read(&fscache_n_store_vmscan_not_storing),
 229                   atomic_read(&fscache_n_store_vmscan_gone),
 230                   atomic_read(&fscache_n_store_vmscan_busy),
 231                   atomic_read(&fscache_n_store_vmscan_cancelled));
 232
 233        seq_printf(m, "Ops    : pend=%u run=%u enq=%u can=%u rej=%u\n",
 234                   atomic_read(&fscache_n_op_pend),
 235                   atomic_read(&fscache_n_op_run),
 236                   atomic_read(&fscache_n_op_enqueue),
 237                   atomic_read(&fscache_n_op_cancelled),
 238                   atomic_read(&fscache_n_op_rejected));
 239        seq_printf(m, "Ops    : dfr=%u rel=%u gc=%u\n",
 240                   atomic_read(&fscache_n_op_deferred_release),
 241                   atomic_read(&fscache_n_op_release),
 242                   atomic_read(&fscache_n_op_gc));
 243
 244        seq_printf(m, "CacheOp: alo=%d luo=%d luc=%d gro=%d\n",
 245                   atomic_read(&fscache_n_cop_alloc_object),
 246                   atomic_read(&fscache_n_cop_lookup_object),
 247                   atomic_read(&fscache_n_cop_lookup_complete),
 248                   atomic_read(&fscache_n_cop_grab_object));
 249        seq_printf(m, "CacheOp: upo=%d dro=%d pto=%d atc=%d syn=%d\n",
 250                   atomic_read(&fscache_n_cop_update_object),
 251                   atomic_read(&fscache_n_cop_drop_object),
 252                   atomic_read(&fscache_n_cop_put_object),
 253                   atomic_read(&fscache_n_cop_attr_changed),
 254                   atomic_read(&fscache_n_cop_sync_cache));
 255        seq_printf(m, "CacheOp: rap=%d ras=%d alp=%d als=%d wrp=%d ucp=%d dsp=%d\n",
 256                   atomic_read(&fscache_n_cop_read_or_alloc_page),
 257                   atomic_read(&fscache_n_cop_read_or_alloc_pages),
 258                   atomic_read(&fscache_n_cop_allocate_page),
 259                   atomic_read(&fscache_n_cop_allocate_pages),
 260                   atomic_read(&fscache_n_cop_write_page),
 261                   atomic_read(&fscache_n_cop_uncache_page),
 262                   atomic_read(&fscache_n_cop_dissociate_pages));
 263        return 0;
 264}
 265
 266/*
 267 * open "/proc/fs/fscache/stats" allowing provision of a statistical summary
 268 */
 269static int fscache_stats_open(struct inode *inode, struct file *file)
 270{
 271        return single_open(file, fscache_stats_show, NULL);
 272}
 273
 274const struct file_operations fscache_stats_fops = {
 275        .owner          = THIS_MODULE,
 276        .open           = fscache_stats_open,
 277        .read           = seq_read,
 278        .llseek         = seq_lseek,
 279        .release        = seq_release,
 280};
 281