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 */ 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