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 */
21atomic_t fscache_n_op_pend;
22atomic_t fscache_n_op_run;
23atomic_t fscache_n_op_enqueue;
24atomic_t fscache_n_op_requeue;
25atomic_t fscache_n_op_deferred_release;
26atomic_t fscache_n_op_initialised;
27atomic_t fscache_n_op_release;
28atomic_t fscache_n_op_gc;
29atomic_t fscache_n_op_cancelled;
30atomic_t fscache_n_op_rejected;
31
32atomic_t fscache_n_attr_changed;
33atomic_t fscache_n_attr_changed_ok;
34atomic_t fscache_n_attr_changed_nobufs;
35atomic_t fscache_n_attr_changed_nomem;
36atomic_t fscache_n_attr_changed_calls;
37
38atomic_t fscache_n_allocs;
39atomic_t fscache_n_allocs_ok;
40atomic_t fscache_n_allocs_wait;
41atomic_t fscache_n_allocs_nobufs;
42atomic_t fscache_n_allocs_intr;
43atomic_t fscache_n_allocs_object_dead;
44atomic_t fscache_n_alloc_ops;
45atomic_t fscache_n_alloc_op_waits;
46
47atomic_t fscache_n_retrievals;
48atomic_t fscache_n_retrievals_ok;
49atomic_t fscache_n_retrievals_wait;
50atomic_t fscache_n_retrievals_nodata;
51atomic_t fscache_n_retrievals_nobufs;
52atomic_t fscache_n_retrievals_intr;
53atomic_t fscache_n_retrievals_nomem;
54atomic_t fscache_n_retrievals_object_dead;
55atomic_t fscache_n_retrieval_ops;
56atomic_t fscache_n_retrieval_op_waits;
57
58atomic_t fscache_n_stores;
59atomic_t fscache_n_stores_ok;
60atomic_t fscache_n_stores_again;
61atomic_t fscache_n_stores_nobufs;
62atomic_t fscache_n_stores_oom;
63atomic_t fscache_n_store_ops;
64atomic_t fscache_n_store_calls;
65atomic_t fscache_n_store_pages;
66atomic_t fscache_n_store_radix_deletes;
67atomic_t fscache_n_store_pages_over_limit;
68
69atomic_t fscache_n_store_vmscan_not_storing;
70atomic_t fscache_n_store_vmscan_gone;
71atomic_t fscache_n_store_vmscan_busy;
72atomic_t fscache_n_store_vmscan_cancelled;
73atomic_t fscache_n_store_vmscan_wait;
74
75atomic_t fscache_n_marks;
76atomic_t fscache_n_uncaches;
77
78atomic_t fscache_n_acquires;
79atomic_t fscache_n_acquires_null;
80atomic_t fscache_n_acquires_no_cache;
81atomic_t fscache_n_acquires_ok;
82atomic_t fscache_n_acquires_nobufs;
83atomic_t fscache_n_acquires_oom;
84
85atomic_t fscache_n_invalidates;
86atomic_t fscache_n_invalidates_run;
87
88atomic_t fscache_n_updates;
89atomic_t fscache_n_updates_null;
90atomic_t fscache_n_updates_run;
91
92atomic_t fscache_n_relinquishes;
93atomic_t fscache_n_relinquishes_null;
94atomic_t fscache_n_relinquishes_waitcrt;
95atomic_t fscache_n_relinquishes_retire;
96
97atomic_t fscache_n_cookie_index;
98atomic_t fscache_n_cookie_data;
99atomic_t fscache_n_cookie_special;
100
101atomic_t fscache_n_object_alloc;
102atomic_t fscache_n_object_no_alloc;
103atomic_t fscache_n_object_lookups;
104atomic_t fscache_n_object_lookups_negative;
105atomic_t fscache_n_object_lookups_positive;
106atomic_t fscache_n_object_lookups_timed_out;
107atomic_t fscache_n_object_created;
108atomic_t fscache_n_object_avail;
109atomic_t fscache_n_object_dead;
110
111atomic_t fscache_n_checkaux_none;
112atomic_t fscache_n_checkaux_okay;
113atomic_t fscache_n_checkaux_update;
114atomic_t fscache_n_checkaux_obsolete;
115
116atomic_t fscache_n_cop_alloc_object;
117atomic_t fscache_n_cop_lookup_object;
118atomic_t fscache_n_cop_lookup_complete;
119atomic_t fscache_n_cop_grab_object;
120atomic_t fscache_n_cop_invalidate_object;
121atomic_t fscache_n_cop_update_object;
122atomic_t fscache_n_cop_drop_object;
123atomic_t fscache_n_cop_put_object;
124atomic_t fscache_n_cop_sync_cache;
125atomic_t fscache_n_cop_attr_changed;
126atomic_t fscache_n_cop_read_or_alloc_page;
127atomic_t fscache_n_cop_read_or_alloc_pages;
128atomic_t fscache_n_cop_allocate_page;
129atomic_t fscache_n_cop_allocate_pages;
130atomic_t fscache_n_cop_write_page;
131atomic_t fscache_n_cop_uncache_page;
132atomic_t fscache_n_cop_dissociate_pages;
133
134atomic_t fscache_n_cache_no_space_reject;
135atomic_t fscache_n_cache_stale_objects;
136atomic_t fscache_n_cache_retired_objects;
137atomic_t fscache_n_cache_culled_objects;
138
139/*
140 * display the general statistics
141 */
142static 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 */
292static int fscache_stats_open(struct inode *inode, struct file *file)
293{
294	return single_open(file, fscache_stats_show, NULL);
295}
296
297const 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