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_deferred_release; 25 atomic_t fscache_n_op_initialised; 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 atomic_t fscache_n_store_vmscan_wait; 73 74 atomic_t fscache_n_marks; 75 atomic_t fscache_n_uncaches; 76 77 atomic_t fscache_n_acquires; 78 atomic_t fscache_n_acquires_null; 79 atomic_t fscache_n_acquires_no_cache; 80 atomic_t fscache_n_acquires_ok; 81 atomic_t fscache_n_acquires_nobufs; 82 atomic_t fscache_n_acquires_oom; 83 84 atomic_t fscache_n_invalidates; 85 atomic_t fscache_n_invalidates_run; 86 87 atomic_t fscache_n_updates; 88 atomic_t fscache_n_updates_null; 89 atomic_t fscache_n_updates_run; 90 91 atomic_t fscache_n_relinquishes; 92 atomic_t fscache_n_relinquishes_null; 93 atomic_t fscache_n_relinquishes_waitcrt; 94 atomic_t fscache_n_relinquishes_retire; 95 96 atomic_t fscache_n_cookie_index; 97 atomic_t fscache_n_cookie_data; 98 atomic_t fscache_n_cookie_special; 99 100 atomic_t fscache_n_object_alloc; 101 atomic_t fscache_n_object_no_alloc; 102 atomic_t fscache_n_object_lookups; 103 atomic_t fscache_n_object_lookups_negative; 104 atomic_t fscache_n_object_lookups_positive; 105 atomic_t fscache_n_object_lookups_timed_out; 106 atomic_t fscache_n_object_created; 107 atomic_t fscache_n_object_avail; 108 atomic_t fscache_n_object_dead; 109 110 atomic_t fscache_n_checkaux_none; 111 atomic_t fscache_n_checkaux_okay; 112 atomic_t fscache_n_checkaux_update; 113 atomic_t fscache_n_checkaux_obsolete; 114 115 atomic_t fscache_n_cop_alloc_object; 116 atomic_t fscache_n_cop_lookup_object; 117 atomic_t fscache_n_cop_lookup_complete; 118 atomic_t fscache_n_cop_grab_object; 119 atomic_t fscache_n_cop_invalidate_object; 120 atomic_t fscache_n_cop_update_object; 121 atomic_t fscache_n_cop_drop_object; 122 atomic_t fscache_n_cop_put_object; 123 atomic_t fscache_n_cop_sync_cache; 124 atomic_t fscache_n_cop_attr_changed; 125 atomic_t fscache_n_cop_read_or_alloc_page; 126 atomic_t fscache_n_cop_read_or_alloc_pages; 127 atomic_t fscache_n_cop_allocate_page; 128 atomic_t fscache_n_cop_allocate_pages; 129 atomic_t fscache_n_cop_write_page; 130 atomic_t fscache_n_cop_uncache_page; 131 atomic_t fscache_n_cop_dissociate_pages; 132 133 atomic_t fscache_n_cache_no_space_reject; 134 atomic_t fscache_n_cache_stale_objects; 135 atomic_t fscache_n_cache_retired_objects; 136 atomic_t fscache_n_cache_culled_objects; 137 138 /* 139 * display the general statistics 140 */ 141 static int fscache_stats_show(struct seq_file *m, void *v) 142 { 143 seq_puts(m, "FS-Cache statistics\n"); 144 145 seq_printf(m, "Cookies: idx=%u dat=%u spc=%u\n", 146 atomic_read(&fscache_n_cookie_index), 147 atomic_read(&fscache_n_cookie_data), 148 atomic_read(&fscache_n_cookie_special)); 149 150 seq_printf(m, "Objects: alc=%u nal=%u avl=%u ded=%u\n", 151 atomic_read(&fscache_n_object_alloc), 152 atomic_read(&fscache_n_object_no_alloc), 153 atomic_read(&fscache_n_object_avail), 154 atomic_read(&fscache_n_object_dead)); 155 seq_printf(m, "ChkAux : non=%u ok=%u upd=%u obs=%u\n", 156 atomic_read(&fscache_n_checkaux_none), 157 atomic_read(&fscache_n_checkaux_okay), 158 atomic_read(&fscache_n_checkaux_update), 159 atomic_read(&fscache_n_checkaux_obsolete)); 160 161 seq_printf(m, "Pages : mrk=%u unc=%u\n", 162 atomic_read(&fscache_n_marks), 163 atomic_read(&fscache_n_uncaches)); 164 165 seq_printf(m, "Acquire: n=%u nul=%u noc=%u ok=%u nbf=%u" 166 " oom=%u\n", 167 atomic_read(&fscache_n_acquires), 168 atomic_read(&fscache_n_acquires_null), 169 atomic_read(&fscache_n_acquires_no_cache), 170 atomic_read(&fscache_n_acquires_ok), 171 atomic_read(&fscache_n_acquires_nobufs), 172 atomic_read(&fscache_n_acquires_oom)); 173 174 seq_printf(m, "Lookups: n=%u neg=%u pos=%u crt=%u tmo=%u\n", 175 atomic_read(&fscache_n_object_lookups), 176 atomic_read(&fscache_n_object_lookups_negative), 177 atomic_read(&fscache_n_object_lookups_positive), 178 atomic_read(&fscache_n_object_created), 179 atomic_read(&fscache_n_object_lookups_timed_out)); 180 181 seq_printf(m, "Invals : n=%u run=%u\n", 182 atomic_read(&fscache_n_invalidates), 183 atomic_read(&fscache_n_invalidates_run)); 184 185 seq_printf(m, "Updates: n=%u nul=%u run=%u\n", 186 atomic_read(&fscache_n_updates), 187 atomic_read(&fscache_n_updates_null), 188 atomic_read(&fscache_n_updates_run)); 189 190 seq_printf(m, "Relinqs: n=%u nul=%u wcr=%u rtr=%u\n", 191 atomic_read(&fscache_n_relinquishes), 192 atomic_read(&fscache_n_relinquishes_null), 193 atomic_read(&fscache_n_relinquishes_waitcrt), 194 atomic_read(&fscache_n_relinquishes_retire)); 195 196 seq_printf(m, "AttrChg: n=%u ok=%u nbf=%u oom=%u run=%u\n", 197 atomic_read(&fscache_n_attr_changed), 198 atomic_read(&fscache_n_attr_changed_ok), 199 atomic_read(&fscache_n_attr_changed_nobufs), 200 atomic_read(&fscache_n_attr_changed_nomem), 201 atomic_read(&fscache_n_attr_changed_calls)); 202 203 seq_printf(m, "Allocs : n=%u ok=%u wt=%u nbf=%u int=%u\n", 204 atomic_read(&fscache_n_allocs), 205 atomic_read(&fscache_n_allocs_ok), 206 atomic_read(&fscache_n_allocs_wait), 207 atomic_read(&fscache_n_allocs_nobufs), 208 atomic_read(&fscache_n_allocs_intr)); 209 seq_printf(m, "Allocs : ops=%u owt=%u abt=%u\n", 210 atomic_read(&fscache_n_alloc_ops), 211 atomic_read(&fscache_n_alloc_op_waits), 212 atomic_read(&fscache_n_allocs_object_dead)); 213 214 seq_printf(m, "Retrvls: n=%u ok=%u wt=%u nod=%u nbf=%u" 215 " int=%u oom=%u\n", 216 atomic_read(&fscache_n_retrievals), 217 atomic_read(&fscache_n_retrievals_ok), 218 atomic_read(&fscache_n_retrievals_wait), 219 atomic_read(&fscache_n_retrievals_nodata), 220 atomic_read(&fscache_n_retrievals_nobufs), 221 atomic_read(&fscache_n_retrievals_intr), 222 atomic_read(&fscache_n_retrievals_nomem)); 223 seq_printf(m, "Retrvls: ops=%u owt=%u abt=%u\n", 224 atomic_read(&fscache_n_retrieval_ops), 225 atomic_read(&fscache_n_retrieval_op_waits), 226 atomic_read(&fscache_n_retrievals_object_dead)); 227 228 seq_printf(m, "Stores : n=%u ok=%u agn=%u nbf=%u oom=%u\n", 229 atomic_read(&fscache_n_stores), 230 atomic_read(&fscache_n_stores_ok), 231 atomic_read(&fscache_n_stores_again), 232 atomic_read(&fscache_n_stores_nobufs), 233 atomic_read(&fscache_n_stores_oom)); 234 seq_printf(m, "Stores : ops=%u run=%u pgs=%u rxd=%u olm=%u\n", 235 atomic_read(&fscache_n_store_ops), 236 atomic_read(&fscache_n_store_calls), 237 atomic_read(&fscache_n_store_pages), 238 atomic_read(&fscache_n_store_radix_deletes), 239 atomic_read(&fscache_n_store_pages_over_limit)); 240 241 seq_printf(m, "VmScan : nos=%u gon=%u bsy=%u can=%u wt=%u\n", 242 atomic_read(&fscache_n_store_vmscan_not_storing), 243 atomic_read(&fscache_n_store_vmscan_gone), 244 atomic_read(&fscache_n_store_vmscan_busy), 245 atomic_read(&fscache_n_store_vmscan_cancelled), 246 atomic_read(&fscache_n_store_vmscan_wait)); 247 248 seq_printf(m, "Ops : pend=%u run=%u enq=%u can=%u rej=%u\n", 249 atomic_read(&fscache_n_op_pend), 250 atomic_read(&fscache_n_op_run), 251 atomic_read(&fscache_n_op_enqueue), 252 atomic_read(&fscache_n_op_cancelled), 253 atomic_read(&fscache_n_op_rejected)); 254 seq_printf(m, "Ops : ini=%u dfr=%u rel=%u gc=%u\n", 255 atomic_read(&fscache_n_op_initialised), 256 atomic_read(&fscache_n_op_deferred_release), 257 atomic_read(&fscache_n_op_release), 258 atomic_read(&fscache_n_op_gc)); 259 260 seq_printf(m, "CacheOp: alo=%d luo=%d luc=%d gro=%d\n", 261 atomic_read(&fscache_n_cop_alloc_object), 262 atomic_read(&fscache_n_cop_lookup_object), 263 atomic_read(&fscache_n_cop_lookup_complete), 264 atomic_read(&fscache_n_cop_grab_object)); 265 seq_printf(m, "CacheOp: inv=%d upo=%d dro=%d pto=%d atc=%d syn=%d\n", 266 atomic_read(&fscache_n_cop_invalidate_object), 267 atomic_read(&fscache_n_cop_update_object), 268 atomic_read(&fscache_n_cop_drop_object), 269 atomic_read(&fscache_n_cop_put_object), 270 atomic_read(&fscache_n_cop_attr_changed), 271 atomic_read(&fscache_n_cop_sync_cache)); 272 seq_printf(m, "CacheOp: rap=%d ras=%d alp=%d als=%d wrp=%d ucp=%d dsp=%d\n", 273 atomic_read(&fscache_n_cop_read_or_alloc_page), 274 atomic_read(&fscache_n_cop_read_or_alloc_pages), 275 atomic_read(&fscache_n_cop_allocate_page), 276 atomic_read(&fscache_n_cop_allocate_pages), 277 atomic_read(&fscache_n_cop_write_page), 278 atomic_read(&fscache_n_cop_uncache_page), 279 atomic_read(&fscache_n_cop_dissociate_pages)); 280 seq_printf(m, "CacheEv: nsp=%d stl=%d rtr=%d cul=%d\n", 281 atomic_read(&fscache_n_cache_no_space_reject), 282 atomic_read(&fscache_n_cache_stale_objects), 283 atomic_read(&fscache_n_cache_retired_objects), 284 atomic_read(&fscache_n_cache_culled_objects)); 285 return 0; 286 } 287 288 /* 289 * open "/proc/fs/fscache/stats" allowing provision of a statistical summary 290 */ 291 static int fscache_stats_open(struct inode *inode, struct file *file) 292 { 293 return single_open(file, fscache_stats_show, NULL); 294 } 295 296 const struct file_operations fscache_stats_fops = { 297 .open = fscache_stats_open, 298 .read = seq_read, 299 .llseek = seq_lseek, 300 .release = single_release, 301 }; 302