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_initialised;
27 atomic_t fscache_n_op_release;
28 atomic_t fscache_n_op_gc;
29 atomic_t fscache_n_op_cancelled;
30 atomic_t fscache_n_op_rejected;
31
32 atomic_t fscache_n_attr_changed;
33 atomic_t fscache_n_attr_changed_ok;
34 atomic_t fscache_n_attr_changed_nobufs;
35 atomic_t fscache_n_attr_changed_nomem;
36 atomic_t fscache_n_attr_changed_calls;
37
38 atomic_t fscache_n_allocs;
39 atomic_t fscache_n_allocs_ok;
40 atomic_t fscache_n_allocs_wait;
41 atomic_t fscache_n_allocs_nobufs;
42 atomic_t fscache_n_allocs_intr;
43 atomic_t fscache_n_allocs_object_dead;
44 atomic_t fscache_n_alloc_ops;
45 atomic_t fscache_n_alloc_op_waits;
46
47 atomic_t fscache_n_retrievals;
48 atomic_t fscache_n_retrievals_ok;
49 atomic_t fscache_n_retrievals_wait;
50 atomic_t fscache_n_retrievals_nodata;
51 atomic_t fscache_n_retrievals_nobufs;
52 atomic_t fscache_n_retrievals_intr;
53 atomic_t fscache_n_retrievals_nomem;
54 atomic_t fscache_n_retrievals_object_dead;
55 atomic_t fscache_n_retrieval_ops;
56 atomic_t fscache_n_retrieval_op_waits;
57
58 atomic_t fscache_n_stores;
59 atomic_t fscache_n_stores_ok;
60 atomic_t fscache_n_stores_again;
61 atomic_t fscache_n_stores_nobufs;
62 atomic_t fscache_n_stores_oom;
63 atomic_t fscache_n_store_ops;
64 atomic_t fscache_n_store_calls;
65 atomic_t fscache_n_store_pages;
66 atomic_t fscache_n_store_radix_deletes;
67 atomic_t fscache_n_store_pages_over_limit;
68
69 atomic_t fscache_n_store_vmscan_not_storing;
70 atomic_t fscache_n_store_vmscan_gone;
71 atomic_t fscache_n_store_vmscan_busy;
72 atomic_t fscache_n_store_vmscan_cancelled;
73 atomic_t fscache_n_store_vmscan_wait;
74
75 atomic_t fscache_n_marks;
76 atomic_t fscache_n_uncaches;
77
78 atomic_t fscache_n_acquires;
79 atomic_t fscache_n_acquires_null;
80 atomic_t fscache_n_acquires_no_cache;
81 atomic_t fscache_n_acquires_ok;
82 atomic_t fscache_n_acquires_nobufs;
83 atomic_t fscache_n_acquires_oom;
84
85 atomic_t fscache_n_invalidates;
86 atomic_t fscache_n_invalidates_run;
87
88 atomic_t fscache_n_updates;
89 atomic_t fscache_n_updates_null;
90 atomic_t fscache_n_updates_run;
91
92 atomic_t fscache_n_relinquishes;
93 atomic_t fscache_n_relinquishes_null;
94 atomic_t fscache_n_relinquishes_waitcrt;
95 atomic_t fscache_n_relinquishes_retire;
96
97 atomic_t fscache_n_cookie_index;
98 atomic_t fscache_n_cookie_data;
99 atomic_t fscache_n_cookie_special;
100
101 atomic_t fscache_n_object_alloc;
102 atomic_t fscache_n_object_no_alloc;
103 atomic_t fscache_n_object_lookups;
104 atomic_t fscache_n_object_lookups_negative;
105 atomic_t fscache_n_object_lookups_positive;
106 atomic_t fscache_n_object_lookups_timed_out;
107 atomic_t fscache_n_object_created;
108 atomic_t fscache_n_object_avail;
109 atomic_t fscache_n_object_dead;
110
111 atomic_t fscache_n_checkaux_none;
112 atomic_t fscache_n_checkaux_okay;
113 atomic_t fscache_n_checkaux_update;
114 atomic_t fscache_n_checkaux_obsolete;
115
116 atomic_t fscache_n_cop_alloc_object;
117 atomic_t fscache_n_cop_lookup_object;
118 atomic_t fscache_n_cop_lookup_complete;
119 atomic_t fscache_n_cop_grab_object;
120 atomic_t fscache_n_cop_invalidate_object;
121 atomic_t fscache_n_cop_update_object;
122 atomic_t fscache_n_cop_drop_object;
123 atomic_t fscache_n_cop_put_object;
124 atomic_t fscache_n_cop_sync_cache;
125 atomic_t fscache_n_cop_attr_changed;
126 atomic_t fscache_n_cop_read_or_alloc_page;
127 atomic_t fscache_n_cop_read_or_alloc_pages;
128 atomic_t fscache_n_cop_allocate_page;
129 atomic_t fscache_n_cop_allocate_pages;
130 atomic_t fscache_n_cop_write_page;
131 atomic_t fscache_n_cop_uncache_page;
132 atomic_t fscache_n_cop_dissociate_pages;
133
134 atomic_t fscache_n_cache_no_space_reject;
135 atomic_t fscache_n_cache_stale_objects;
136 atomic_t fscache_n_cache_retired_objects;
137 atomic_t fscache_n_cache_culled_objects;
138
139 /*
140 * display the general statistics
141 */
fscache_stats_show(struct seq_file * m,void * v)142 static int fscache_stats_show(struct seq_file *m, void *v)
143 {
144 seq_puts(m, "FS-Cache statistics\n");
145
146 seq_printf(m, "Cookies: idx=%u dat=%u spc=%u\n",
147 atomic_read(&fscache_n_cookie_index),
148 atomic_read(&fscache_n_cookie_data),
149 atomic_read(&fscache_n_cookie_special));
150
151 seq_printf(m, "Objects: alc=%u nal=%u avl=%u ded=%u\n",
152 atomic_read(&fscache_n_object_alloc),
153 atomic_read(&fscache_n_object_no_alloc),
154 atomic_read(&fscache_n_object_avail),
155 atomic_read(&fscache_n_object_dead));
156 seq_printf(m, "ChkAux : non=%u ok=%u upd=%u obs=%u\n",
157 atomic_read(&fscache_n_checkaux_none),
158 atomic_read(&fscache_n_checkaux_okay),
159 atomic_read(&fscache_n_checkaux_update),
160 atomic_read(&fscache_n_checkaux_obsolete));
161
162 seq_printf(m, "Pages : mrk=%u unc=%u\n",
163 atomic_read(&fscache_n_marks),
164 atomic_read(&fscache_n_uncaches));
165
166 seq_printf(m, "Acquire: n=%u nul=%u noc=%u ok=%u nbf=%u"
167 " oom=%u\n",
168 atomic_read(&fscache_n_acquires),
169 atomic_read(&fscache_n_acquires_null),
170 atomic_read(&fscache_n_acquires_no_cache),
171 atomic_read(&fscache_n_acquires_ok),
172 atomic_read(&fscache_n_acquires_nobufs),
173 atomic_read(&fscache_n_acquires_oom));
174
175 seq_printf(m, "Lookups: n=%u neg=%u pos=%u crt=%u tmo=%u\n",
176 atomic_read(&fscache_n_object_lookups),
177 atomic_read(&fscache_n_object_lookups_negative),
178 atomic_read(&fscache_n_object_lookups_positive),
179 atomic_read(&fscache_n_object_created),
180 atomic_read(&fscache_n_object_lookups_timed_out));
181
182 seq_printf(m, "Invals : n=%u run=%u\n",
183 atomic_read(&fscache_n_invalidates),
184 atomic_read(&fscache_n_invalidates_run));
185
186 seq_printf(m, "Updates: n=%u nul=%u run=%u\n",
187 atomic_read(&fscache_n_updates),
188 atomic_read(&fscache_n_updates_null),
189 atomic_read(&fscache_n_updates_run));
190
191 seq_printf(m, "Relinqs: n=%u nul=%u wcr=%u rtr=%u\n",
192 atomic_read(&fscache_n_relinquishes),
193 atomic_read(&fscache_n_relinquishes_null),
194 atomic_read(&fscache_n_relinquishes_waitcrt),
195 atomic_read(&fscache_n_relinquishes_retire));
196
197 seq_printf(m, "AttrChg: n=%u ok=%u nbf=%u oom=%u run=%u\n",
198 atomic_read(&fscache_n_attr_changed),
199 atomic_read(&fscache_n_attr_changed_ok),
200 atomic_read(&fscache_n_attr_changed_nobufs),
201 atomic_read(&fscache_n_attr_changed_nomem),
202 atomic_read(&fscache_n_attr_changed_calls));
203
204 seq_printf(m, "Allocs : n=%u ok=%u wt=%u nbf=%u int=%u\n",
205 atomic_read(&fscache_n_allocs),
206 atomic_read(&fscache_n_allocs_ok),
207 atomic_read(&fscache_n_allocs_wait),
208 atomic_read(&fscache_n_allocs_nobufs),
209 atomic_read(&fscache_n_allocs_intr));
210 seq_printf(m, "Allocs : ops=%u owt=%u abt=%u\n",
211 atomic_read(&fscache_n_alloc_ops),
212 atomic_read(&fscache_n_alloc_op_waits),
213 atomic_read(&fscache_n_allocs_object_dead));
214
215 seq_printf(m, "Retrvls: n=%u ok=%u wt=%u nod=%u nbf=%u"
216 " int=%u oom=%u\n",
217 atomic_read(&fscache_n_retrievals),
218 atomic_read(&fscache_n_retrievals_ok),
219 atomic_read(&fscache_n_retrievals_wait),
220 atomic_read(&fscache_n_retrievals_nodata),
221 atomic_read(&fscache_n_retrievals_nobufs),
222 atomic_read(&fscache_n_retrievals_intr),
223 atomic_read(&fscache_n_retrievals_nomem));
224 seq_printf(m, "Retrvls: ops=%u owt=%u abt=%u\n",
225 atomic_read(&fscache_n_retrieval_ops),
226 atomic_read(&fscache_n_retrieval_op_waits),
227 atomic_read(&fscache_n_retrievals_object_dead));
228
229 seq_printf(m, "Stores : n=%u ok=%u agn=%u nbf=%u oom=%u\n",
230 atomic_read(&fscache_n_stores),
231 atomic_read(&fscache_n_stores_ok),
232 atomic_read(&fscache_n_stores_again),
233 atomic_read(&fscache_n_stores_nobufs),
234 atomic_read(&fscache_n_stores_oom));
235 seq_printf(m, "Stores : ops=%u run=%u pgs=%u rxd=%u olm=%u\n",
236 atomic_read(&fscache_n_store_ops),
237 atomic_read(&fscache_n_store_calls),
238 atomic_read(&fscache_n_store_pages),
239 atomic_read(&fscache_n_store_radix_deletes),
240 atomic_read(&fscache_n_store_pages_over_limit));
241
242 seq_printf(m, "VmScan : nos=%u gon=%u bsy=%u can=%u wt=%u\n",
243 atomic_read(&fscache_n_store_vmscan_not_storing),
244 atomic_read(&fscache_n_store_vmscan_gone),
245 atomic_read(&fscache_n_store_vmscan_busy),
246 atomic_read(&fscache_n_store_vmscan_cancelled),
247 atomic_read(&fscache_n_store_vmscan_wait));
248
249 seq_printf(m, "Ops : pend=%u run=%u enq=%u can=%u rej=%u\n",
250 atomic_read(&fscache_n_op_pend),
251 atomic_read(&fscache_n_op_run),
252 atomic_read(&fscache_n_op_enqueue),
253 atomic_read(&fscache_n_op_cancelled),
254 atomic_read(&fscache_n_op_rejected));
255 seq_printf(m, "Ops : ini=%u dfr=%u rel=%u gc=%u\n",
256 atomic_read(&fscache_n_op_initialised),
257 atomic_read(&fscache_n_op_deferred_release),
258 atomic_read(&fscache_n_op_release),
259 atomic_read(&fscache_n_op_gc));
260
261 seq_printf(m, "CacheOp: alo=%d luo=%d luc=%d gro=%d\n",
262 atomic_read(&fscache_n_cop_alloc_object),
263 atomic_read(&fscache_n_cop_lookup_object),
264 atomic_read(&fscache_n_cop_lookup_complete),
265 atomic_read(&fscache_n_cop_grab_object));
266 seq_printf(m, "CacheOp: inv=%d upo=%d dro=%d pto=%d atc=%d syn=%d\n",
267 atomic_read(&fscache_n_cop_invalidate_object),
268 atomic_read(&fscache_n_cop_update_object),
269 atomic_read(&fscache_n_cop_drop_object),
270 atomic_read(&fscache_n_cop_put_object),
271 atomic_read(&fscache_n_cop_attr_changed),
272 atomic_read(&fscache_n_cop_sync_cache));
273 seq_printf(m, "CacheOp: rap=%d ras=%d alp=%d als=%d wrp=%d ucp=%d dsp=%d\n",
274 atomic_read(&fscache_n_cop_read_or_alloc_page),
275 atomic_read(&fscache_n_cop_read_or_alloc_pages),
276 atomic_read(&fscache_n_cop_allocate_page),
277 atomic_read(&fscache_n_cop_allocate_pages),
278 atomic_read(&fscache_n_cop_write_page),
279 atomic_read(&fscache_n_cop_uncache_page),
280 atomic_read(&fscache_n_cop_dissociate_pages));
281 seq_printf(m, "CacheEv: nsp=%d stl=%d rtr=%d cul=%d\n",
282 atomic_read(&fscache_n_cache_no_space_reject),
283 atomic_read(&fscache_n_cache_stale_objects),
284 atomic_read(&fscache_n_cache_retired_objects),
285 atomic_read(&fscache_n_cache_culled_objects));
286 return 0;
287 }
288
289 /*
290 * open "/proc/fs/fscache/stats" allowing provision of a statistical summary
291 */
fscache_stats_open(struct inode * inode,struct file * file)292 static int fscache_stats_open(struct inode *inode, struct file *file)
293 {
294 return single_open(file, fscache_stats_show, NULL);
295 }
296
297 const struct file_operations fscache_stats_fops = {
298 .owner = THIS_MODULE,
299 .open = fscache_stats_open,
300 .read = seq_read,
301 .llseek = seq_lseek,
302 .release = single_release,
303 };
304