tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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_release;
27atomic_t fscache_n_op_gc;
28
29atomic_t fscache_n_attr_changed;
30atomic_t fscache_n_attr_changed_ok;
31atomic_t fscache_n_attr_changed_nobufs;
32atomic_t fscache_n_attr_changed_nomem;
33atomic_t fscache_n_attr_changed_calls;
34
35atomic_t fscache_n_allocs;
36atomic_t fscache_n_allocs_ok;
37atomic_t fscache_n_allocs_wait;
38atomic_t fscache_n_allocs_nobufs;
39atomic_t fscache_n_alloc_ops;
40atomic_t fscache_n_alloc_op_waits;
41
42atomic_t fscache_n_retrievals;
43atomic_t fscache_n_retrievals_ok;
44atomic_t fscache_n_retrievals_wait;
45atomic_t fscache_n_retrievals_nodata;
46atomic_t fscache_n_retrievals_nobufs;
47atomic_t fscache_n_retrievals_intr;
48atomic_t fscache_n_retrievals_nomem;
49atomic_t fscache_n_retrieval_ops;
50atomic_t fscache_n_retrieval_op_waits;
51
52atomic_t fscache_n_stores;
53atomic_t fscache_n_stores_ok;
54atomic_t fscache_n_stores_again;
55atomic_t fscache_n_stores_nobufs;
56atomic_t fscache_n_stores_oom;
57atomic_t fscache_n_store_ops;
58atomic_t fscache_n_store_calls;
59
60atomic_t fscache_n_marks;
61atomic_t fscache_n_uncaches;
62
63atomic_t fscache_n_acquires;
64atomic_t fscache_n_acquires_null;
65atomic_t fscache_n_acquires_no_cache;
66atomic_t fscache_n_acquires_ok;
67atomic_t fscache_n_acquires_nobufs;
68atomic_t fscache_n_acquires_oom;
69
70atomic_t fscache_n_updates;
71atomic_t fscache_n_updates_null;
72atomic_t fscache_n_updates_run;
73
74atomic_t fscache_n_relinquishes;
75atomic_t fscache_n_relinquishes_null;
76atomic_t fscache_n_relinquishes_waitcrt;
77
78atomic_t fscache_n_cookie_index;
79atomic_t fscache_n_cookie_data;
80atomic_t fscache_n_cookie_special;
81
82atomic_t fscache_n_object_alloc;
83atomic_t fscache_n_object_no_alloc;
84atomic_t fscache_n_object_lookups;
85atomic_t fscache_n_object_lookups_negative;
86atomic_t fscache_n_object_lookups_positive;
87atomic_t fscache_n_object_created;
88atomic_t fscache_n_object_avail;
89atomic_t fscache_n_object_dead;
90
91atomic_t fscache_n_checkaux_none;
92atomic_t fscache_n_checkaux_okay;
93atomic_t fscache_n_checkaux_update;
94atomic_t fscache_n_checkaux_obsolete;
95
96/*
97 * display the general statistics
98 */
99static 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 */
201static int fscache_stats_open(struct inode *inode, struct file *file)
202{
203 return single_open(file, fscache_stats_show, NULL);
204}
205
206const 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};