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NFSD: Report filecache LRU size

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Surface the NFSD filecache's LRU list length to help field
troubleshooters monitor filecache issues.

Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2022-07-08 14:23:52 -04:00
parent ca3f9acb6d
commit 0fd244c115
1 changed files with 3 additions and 1 deletions
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4
fs/nfsd/filecache.c
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@ -1048,7 +1048,7 @@ nfsd_file_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
static int nfsd_file_cache_stats_show(struct seq_file *m, void *v) static int nfsd_file_cache_stats_show(struct seq_file *m, void *v)
{ {
unsigned int i, count = 0, longest = 0; unsigned int i, count = 0, longest = 0;
unsigned long hits = 0; unsigned long lru = 0, hits = 0;
/* /*
* No need for spinlocks here since we're not terribly interested in * No need for spinlocks here since we're not terribly interested in
@ -1061,6 +1061,7 @@ static int nfsd_file_cache_stats_show(struct seq_file *m, void *v)
count += nfsd_file_hashtbl[i].nfb_count; count += nfsd_file_hashtbl[i].nfb_count;
longest = max(longest, nfsd_file_hashtbl[i].nfb_count); longest = max(longest, nfsd_file_hashtbl[i].nfb_count);
} }
lru = list_lru_count(&nfsd_file_lru);
} }
mutex_unlock(&nfsd_mutex); mutex_unlock(&nfsd_mutex);
@ -1069,6 +1070,7 @@ static int nfsd_file_cache_stats_show(struct seq_file *m, void *v)
seq_printf(m, "total entries: %u\n", count); seq_printf(m, "total entries: %u\n", count);
seq_printf(m, "longest chain: %u\n", longest); seq_printf(m, "longest chain: %u\n", longest);
seq_printf(m, "lru entries: %lu\n", lru);
seq_printf(m, "cache hits: %lu\n", hits); seq_printf(m, "cache hits: %lu\n", hits);
return 0; return 0;
} }