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fscache: Provide read/write stat counters for the cache 

Provide read/write stat counters for the cache backend to use.

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/163819609532.215744.10821082637727410554.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/163906912598.143852.12960327989649429069.stgit@warthog.procyon.org.uk/ # v2
Link: https://lore.kernel.org/r/163967113830.1823006.3222957649202368162.stgit@warthog.procyon.org.uk/ # v3
Link: https://lore.kernel.org/r/164021517502.640689.6077928311710357342.stgit@warthog.procyon.org.uk/ # v4
This commit is contained in:
David Howells 2021-10-20 23:06:16 +01:00
parent cdf262f294
commit 8e7a867bb7
2 changed files with 19 additions and 0 deletions
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9
fs/fscache/stats.c
View File

@ -35,6 +35,11 @@ atomic_t fscache_n_relinquishes;
atomic_t fscache_n_relinquishes_retire;
atomic_t fscache_n_relinquishes_dropped;
atomic_t fscache_n_read;
EXPORT_SYMBOL(fscache_n_read);
atomic_t fscache_n_write;
EXPORT_SYMBOL(fscache_n_write);
/*
* display the general statistics
*/
@ -72,6 +77,10 @@ int fscache_stats_show(struct seq_file *m, void *v)
atomic_read(&fscache_n_relinquishes_retire),
atomic_read(&fscache_n_relinquishes_dropped));
seq_printf(m, "IO : rd=%u wr=%u\n",
atomic_read(&fscache_n_read),
atomic_read(&fscache_n_write));
netfs_stats_show(m);
return 0;
}

10
include/linux/fscache-cache.h
View File

@ -179,4 +179,14 @@ static inline void fscache_wait_for_objects(struct fscache_cache *cache)
atomic_read(&cache->object_count) == 0);
}
#ifdef CONFIG_FSCACHE_STATS
extern atomic_t fscache_n_read;
extern atomic_t fscache_n_write;
#define fscache_count_read() atomic_inc(&fscache_n_read)
#define fscache_count_write() atomic_inc(&fscache_n_write)
#else
#define fscache_count_read() do {} while(0)
#define fscache_count_write() do {} while(0)
#endif
#endif /* _LINUX_FSCACHE_CACHE_H */