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 */
fscache_stats_show(struct seq_file * m,void * v)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 */
fscache_stats_open(struct inode * inode,struct file * file)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 = single_release,
280 };
281