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 */
16atomic_t fscache_n_volumes;
17atomic_t fscache_n_volumes_collision;
18atomic_t fscache_n_volumes_nomem;
19atomic_t fscache_n_cookies;
20atomic_t fscache_n_cookies_lru;
21atomic_t fscache_n_cookies_lru_expired;
22atomic_t fscache_n_cookies_lru_removed;
23atomic_t fscache_n_cookies_lru_dropped;
24
25atomic_t fscache_n_acquires;
26atomic_t fscache_n_acquires_ok;
27atomic_t fscache_n_acquires_oom;
28
29atomic_t fscache_n_invalidates;
30
31atomic_t fscache_n_updates;
32EXPORT_SYMBOL(fscache_n_updates);
33
34atomic_t fscache_n_relinquishes;
35atomic_t fscache_n_relinquishes_retire;
36atomic_t fscache_n_relinquishes_dropped;
37
38atomic_t fscache_n_resizes;
39atomic_t fscache_n_resizes_null;
40
41atomic_t fscache_n_read;
42EXPORT_SYMBOL(fscache_n_read);
43atomic_t fscache_n_write;
44EXPORT_SYMBOL(fscache_n_write);
45atomic_t fscache_n_no_write_space;
46EXPORT_SYMBOL(fscache_n_no_write_space);
47atomic_t fscache_n_no_create_space;
48EXPORT_SYMBOL(fscache_n_no_create_space);
49atomic_t fscache_n_culled;
50EXPORT_SYMBOL(fscache_n_culled);
51atomic_t fscache_n_dio_misfit;
52EXPORT_SYMBOL(fscache_n_dio_misfit);
53
54/*
55 * display the general statistics
56 */
57int fscache_stats_show(struct seq_file *m)
58{
59 seq_puts(m, s: "-- FS-Cache statistics --\n");
60 seq_printf(m, fmt: "Cookies: n=%d v=%d vcol=%u voom=%u\n",
61 atomic_read(v: &fscache_n_cookies),
62 atomic_read(v: &fscache_n_volumes),
63 atomic_read(v: &fscache_n_volumes_collision),
64 atomic_read(v: &fscache_n_volumes_nomem)
65 );
66
67 seq_printf(m, fmt: "Acquire: n=%u ok=%u oom=%u\n",
68 atomic_read(v: &fscache_n_acquires),
69 atomic_read(v: &fscache_n_acquires_ok),
70 atomic_read(v: &fscache_n_acquires_oom));
71
72 seq_printf(m, fmt: "LRU : n=%u exp=%u rmv=%u drp=%u at=%ld\n",
73 atomic_read(v: &fscache_n_cookies_lru),
74 atomic_read(v: &fscache_n_cookies_lru_expired),
75 atomic_read(v: &fscache_n_cookies_lru_removed),
76 atomic_read(v: &fscache_n_cookies_lru_dropped),
77 timer_pending(timer: &fscache_cookie_lru_timer) ?
78 fscache_cookie_lru_timer.expires - jiffies : 0);
79
80 seq_printf(m, fmt: "Invals : n=%u\n",
81 atomic_read(v: &fscache_n_invalidates));
82
83 seq_printf(m, fmt: "Updates: n=%u rsz=%u rsn=%u\n",
84 atomic_read(v: &fscache_n_updates),
85 atomic_read(v: &fscache_n_resizes),
86 atomic_read(v: &fscache_n_resizes_null));
87
88 seq_printf(m, fmt: "Relinqs: n=%u rtr=%u drop=%u\n",
89 atomic_read(v: &fscache_n_relinquishes),
90 atomic_read(v: &fscache_n_relinquishes_retire),
91 atomic_read(v: &fscache_n_relinquishes_dropped));
92
93 seq_printf(m, fmt: "NoSpace: nwr=%u ncr=%u cull=%u\n",
94 atomic_read(v: &fscache_n_no_write_space),
95 atomic_read(v: &fscache_n_no_create_space),
96 atomic_read(v: &fscache_n_culled));
97
98 seq_printf(m, fmt: "IO : rd=%u wr=%u mis=%u\n",
99 atomic_read(v: &fscache_n_read),
100 atomic_read(v: &fscache_n_write),
101 atomic_read(v: &fscache_n_dio_misfit));
102 return 0;
103}
104

source code of linux/fs/netfs/fscache_stats.c