1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* FS-Cache statistics
3 *
4 * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
8 #define FSCACHE_DEBUG_LEVEL CACHE
9 #include <linux/proc_fs.h>
10 #include <linux/seq_file.h>
11 #include "internal.h"
12
13 /*
14 * operation counters
15 */
16 atomic_t fscache_n_volumes;
17 atomic_t fscache_n_volumes_collision;
18 atomic_t fscache_n_volumes_nomem;
19 atomic_t fscache_n_cookies;
20 atomic_t fscache_n_cookies_lru;
21 atomic_t fscache_n_cookies_lru_expired;
22 atomic_t fscache_n_cookies_lru_removed;
23 atomic_t fscache_n_cookies_lru_dropped;
24
25 atomic_t fscache_n_acquires;
26 atomic_t fscache_n_acquires_ok;
27 atomic_t fscache_n_acquires_oom;
28
29 atomic_t fscache_n_invalidates;
30
31 atomic_t fscache_n_updates;
32 EXPORT_SYMBOL(fscache_n_updates);
33
34 atomic_t fscache_n_relinquishes;
35 atomic_t fscache_n_relinquishes_retire;
36 atomic_t fscache_n_relinquishes_dropped;
37
38 atomic_t fscache_n_resizes;
39 atomic_t fscache_n_resizes_null;
40
41 atomic_t fscache_n_read;
42 EXPORT_SYMBOL(fscache_n_read);
43 atomic_t fscache_n_write;
44 EXPORT_SYMBOL(fscache_n_write);
45 atomic_t fscache_n_no_write_space;
46 EXPORT_SYMBOL(fscache_n_no_write_space);
47 atomic_t fscache_n_no_create_space;
48 EXPORT_SYMBOL(fscache_n_no_create_space);
49 atomic_t fscache_n_culled;
50 EXPORT_SYMBOL(fscache_n_culled);
51
52 /*
53 * display the general statistics
54 */
fscache_stats_show(struct seq_file * m,void * v)55 int fscache_stats_show(struct seq_file *m, void *v)
56 {
57 seq_puts(m, "FS-Cache statistics\n");
58 seq_printf(m, "Cookies: n=%d v=%d vcol=%u voom=%u\n",
59 atomic_read(&fscache_n_cookies),
60 atomic_read(&fscache_n_volumes),
61 atomic_read(&fscache_n_volumes_collision),
62 atomic_read(&fscache_n_volumes_nomem)
63 );
64
65 seq_printf(m, "Acquire: n=%u ok=%u oom=%u\n",
66 atomic_read(&fscache_n_acquires),
67 atomic_read(&fscache_n_acquires_ok),
68 atomic_read(&fscache_n_acquires_oom));
69
70 seq_printf(m, "LRU : n=%u exp=%u rmv=%u drp=%u at=%ld\n",
71 atomic_read(&fscache_n_cookies_lru),
72 atomic_read(&fscache_n_cookies_lru_expired),
73 atomic_read(&fscache_n_cookies_lru_removed),
74 atomic_read(&fscache_n_cookies_lru_dropped),
75 timer_pending(&fscache_cookie_lru_timer) ?
76 fscache_cookie_lru_timer.expires - jiffies : 0);
77
78 seq_printf(m, "Invals : n=%u\n",
79 atomic_read(&fscache_n_invalidates));
80
81 seq_printf(m, "Updates: n=%u rsz=%u rsn=%u\n",
82 atomic_read(&fscache_n_updates),
83 atomic_read(&fscache_n_resizes),
84 atomic_read(&fscache_n_resizes_null));
85
86 seq_printf(m, "Relinqs: n=%u rtr=%u drop=%u\n",
87 atomic_read(&fscache_n_relinquishes),
88 atomic_read(&fscache_n_relinquishes_retire),
89 atomic_read(&fscache_n_relinquishes_dropped));
90
91 seq_printf(m, "NoSpace: nwr=%u ncr=%u cull=%u\n",
92 atomic_read(&fscache_n_no_write_space),
93 atomic_read(&fscache_n_no_create_space),
94 atomic_read(&fscache_n_culled));
95
96 seq_printf(m, "IO : rd=%u wr=%u\n",
97 atomic_read(&fscache_n_read),
98 atomic_read(&fscache_n_write));
99
100 netfs_stats_show(m);
101 return 0;
102 }
103