From 91c03a61241f7e42fad58f28d4b8f02b3d52de87 Mon Sep 17 00:00:00 2001 From: Chuck Lever Date: Fri, 8 Jul 2022 14:23:52 -0400 Subject: [PATCH] NFSD: Report filecache LRU size [ Upstream commit 0fd244c115f0321fc5e34ad2291f2a572508e3f7 ] Surface the NFSD filecache's LRU list length to help field troubleshooters monitor filecache issues. Reviewed-by: Jeff Layton Signed-off-by: Chuck Lever Signed-off-by: Sasha Levin --- fs/nfsd/filecache.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/fs/nfsd/filecache.c b/fs/nfsd/filecache.c index 1d3d13b78be0..377d8211200f 100644 --- a/fs/nfsd/filecache.c +++ b/fs/nfsd/filecache.c @@ -1047,7 +1047,7 @@ nfsd_file_create(struct svc_rqst *rqstp, struct svc_fh *fhp, static int nfsd_file_cache_stats_show(struct seq_file *m, void *v) { 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 @@ -1060,6 +1060,7 @@ static int nfsd_file_cache_stats_show(struct seq_file *m, void *v) count += 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); @@ -1068,6 +1069,7 @@ static int nfsd_file_cache_stats_show(struct seq_file *m, void *v) seq_printf(m, "total entries: %u\n", count); seq_printf(m, "longest chain: %u\n", longest); + seq_printf(m, "lru entries: %lu\n", lru); seq_printf(m, "cache hits: %lu\n", hits); return 0; }