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