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, "-- 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}