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 atomic_t fscache_n_dio_misfit;
52 EXPORT_SYMBOL(fscache_n_dio_misfit);
53
54 /*
55 * display the general statistics
56 */
57 int fscache_stats_show(struct seq_file *m)
58 {
59 seq_puts(m, "-- FS-Cache statistics --\n");
60 seq_printf(m, "Cookies: n=%d v=%d vcol=%u voom=%u\n",
61 atomic_read(&fscache_n_cookies),
62 atomic_read(&fscache_n_volumes),
63 atomic_read(&fscache_n_volumes_collision),
64 atomic_read(&fscache_n_volumes_nomem)
65 );
66
67 seq_printf(m, "Acquire: n=%u ok=%u oom=%u\n",
68 atomic_read(&fscache_n_acquires),
69 atomic_read(&fscache_n_acquires_ok),
70 atomic_read(&fscache_n_acquires_oom));
71
72 seq_printf(m, "LRU : n=%u exp=%u rmv=%u drp=%u at=%ld\n",
73 atomic_read(&fscache_n_cookies_lru),
74 atomic_read(&fscache_n_cookies_lru_expired),
75 atomic_read(&fscache_n_cookies_lru_removed),
76 atomic_read(&fscache_n_cookies_lru_dropped),
77 timer_pending(&fscache_cookie_lru_timer) ?
78 fscache_cookie_lru_timer.expires - jiffies : 0);
79
80 seq_printf(m, "Invals : n=%u\n",
81 atomic_read(&fscache_n_invalidates));
82
83 seq_printf(m, "Updates: n=%u rsz=%u rsn=%u\n",
84 atomic_read(&fscache_n_updates),
85 atomic_read(&fscache_n_resizes),
86 atomic_read(&fscache_n_resizes_null));
87
88 seq_printf(m, "Relinqs: n=%u rtr=%u drop=%u\n",
89 atomic_read(&fscache_n_relinquishes),
90 atomic_read(&fscache_n_relinquishes_retire),
91 atomic_read(&fscache_n_relinquishes_dropped));
92
93 seq_printf(m, "NoSpace: nwr=%u ncr=%u cull=%u\n",
94 atomic_read(&fscache_n_no_write_space),
95 atomic_read(&fscache_n_no_create_space),
96 atomic_read(&fscache_n_culled));
97
98 seq_printf(m, "IO : rd=%u wr=%u mis=%u\n",
99 atomic_read(&fscache_n_read),
100 atomic_read(&fscache_n_write),
101 atomic_read(&fscache_n_dio_misfit));
102 return 0;
103 }
104
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