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9f08ebc343
Add a stat counter of culling events whereby the cache backend culls a file to make space (when asked by cachefilesd in this case) and display in /proc/fs/fscache/stats. Signed-off-by: David Howells <dhowells@redhat.com> Reviewed-by: Jeff Layton <jlayton@kernel.org> cc: linux-cachefs@redhat.com Link: https://lore.kernel.org/r/163819654165.215744.3797804661644212436.stgit@warthog.procyon.org.uk/ # v1 Link: https://lore.kernel.org/r/163906961387.143852.9291157239960289090.stgit@warthog.procyon.org.uk/ # v2 Link: https://lore.kernel.org/r/163967168266.1823006.14436200166581605746.stgit@warthog.procyon.org.uk/ # v3 Link: https://lore.kernel.org/r/164021567619.640689.4339228906248763197.stgit@warthog.procyon.org.uk/ # v4
102 lines
2.9 KiB
C
102 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* FS-Cache statistics
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*
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* Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*/
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#define FSCACHE_DEBUG_LEVEL CACHE
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include "internal.h"
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/*
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* operation counters
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*/
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atomic_t fscache_n_volumes;
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atomic_t fscache_n_volumes_collision;
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atomic_t fscache_n_volumes_nomem;
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atomic_t fscache_n_cookies;
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atomic_t fscache_n_cookies_lru;
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atomic_t fscache_n_cookies_lru_expired;
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atomic_t fscache_n_cookies_lru_removed;
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atomic_t fscache_n_cookies_lru_dropped;
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atomic_t fscache_n_acquires;
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atomic_t fscache_n_acquires_ok;
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atomic_t fscache_n_acquires_oom;
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atomic_t fscache_n_invalidates;
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atomic_t fscache_n_updates;
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EXPORT_SYMBOL(fscache_n_updates);
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atomic_t fscache_n_relinquishes;
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atomic_t fscache_n_relinquishes_retire;
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atomic_t fscache_n_relinquishes_dropped;
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atomic_t fscache_n_resizes;
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atomic_t fscache_n_resizes_null;
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atomic_t fscache_n_read;
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EXPORT_SYMBOL(fscache_n_read);
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atomic_t fscache_n_write;
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EXPORT_SYMBOL(fscache_n_write);
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atomic_t fscache_n_no_write_space;
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EXPORT_SYMBOL(fscache_n_no_write_space);
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atomic_t fscache_n_no_create_space;
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EXPORT_SYMBOL(fscache_n_no_create_space);
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atomic_t fscache_n_culled;
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EXPORT_SYMBOL(fscache_n_culled);
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/*
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* display the general statistics
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*/
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int fscache_stats_show(struct seq_file *m, void *v)
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{
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seq_puts(m, "FS-Cache statistics\n");
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seq_printf(m, "Cookies: n=%d v=%d vcol=%u voom=%u\n",
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atomic_read(&fscache_n_cookies),
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atomic_read(&fscache_n_volumes),
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atomic_read(&fscache_n_volumes_collision),
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atomic_read(&fscache_n_volumes_nomem)
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);
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seq_printf(m, "Acquire: n=%u ok=%u oom=%u\n",
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atomic_read(&fscache_n_acquires),
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atomic_read(&fscache_n_acquires_ok),
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atomic_read(&fscache_n_acquires_oom));
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seq_printf(m, "LRU : n=%u exp=%u rmv=%u drp=%u at=%ld\n",
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atomic_read(&fscache_n_cookies_lru),
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atomic_read(&fscache_n_cookies_lru_expired),
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atomic_read(&fscache_n_cookies_lru_removed),
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atomic_read(&fscache_n_cookies_lru_dropped),
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timer_pending(&fscache_cookie_lru_timer) ?
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fscache_cookie_lru_timer.expires - jiffies : 0);
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seq_printf(m, "Invals : n=%u\n",
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atomic_read(&fscache_n_invalidates));
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seq_printf(m, "Updates: n=%u rsz=%u rsn=%u\n",
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atomic_read(&fscache_n_updates),
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atomic_read(&fscache_n_resizes),
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atomic_read(&fscache_n_resizes_null));
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seq_printf(m, "Relinqs: n=%u rtr=%u drop=%u\n",
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atomic_read(&fscache_n_relinquishes),
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atomic_read(&fscache_n_relinquishes_retire),
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atomic_read(&fscache_n_relinquishes_dropped));
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seq_printf(m, "NoSpace: nwr=%u ncr=%u cull=%u\n",
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atomic_read(&fscache_n_no_write_space),
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atomic_read(&fscache_n_no_create_space),
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atomic_read(&fscache_n_culled));
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seq_printf(m, "IO : rd=%u wr=%u\n",
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atomic_read(&fscache_n_read),
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atomic_read(&fscache_n_write));
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netfs_stats_show(m);
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return 0;
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}
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