This is a note to let you know that I've just added the patch titled
NFSD: Report filecache LRU size
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
nfsd-report-filecache-lru-size.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit b0c456493617744d09bd35b181a77ea4055ae1b2
Author: Chuck Lever <chuck.lever@xxxxxxxxxx>
Date: Fri Jul 8 14:23:52 2022 -0400
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 <jlayton@xxxxxxxxxx>
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
diff --git a/fs/nfsd/filecache.c b/fs/nfsd/filecache.c
index 1d3d13b78be0e..377d8211200ff 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;
}
