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