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_lookups_timed_out; 102 atomic_t fscache_n_object_created; 103 atomic_t fscache_n_object_avail; 104 atomic_t fscache_n_object_dead; 105 106 atomic_t fscache_n_checkaux_none; 107 atomic_t fscache_n_checkaux_okay; 108 atomic_t fscache_n_checkaux_update; 109 atomic_t fscache_n_checkaux_obsolete; 110 111 atomic_t fscache_n_cop_alloc_object; 112 atomic_t fscache_n_cop_lookup_object; 113 atomic_t fscache_n_cop_lookup_complete; 114 atomic_t fscache_n_cop_grab_object; 115 atomic_t fscache_n_cop_update_object; 116 atomic_t fscache_n_cop_drop_object; 117 atomic_t fscache_n_cop_put_object; 118 atomic_t fscache_n_cop_sync_cache; 119 atomic_t fscache_n_cop_attr_changed; 120 atomic_t fscache_n_cop_read_or_alloc_page; 121 atomic_t fscache_n_cop_read_or_alloc_pages; 122 atomic_t fscache_n_cop_allocate_page; 123 atomic_t fscache_n_cop_allocate_pages; 124 atomic_t fscache_n_cop_write_page; 125 atomic_t fscache_n_cop_uncache_page; 126 atomic_t fscache_n_cop_dissociate_pages; 127 128 /* 129 * display the general statistics 130 */ 131 static 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 */ 269 static int fscache_stats_open(struct inode *inode, struct file *file) 270 { 271 return single_open(file, fscache_stats_show, NULL); 272 } 273 274 const 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