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