Received-SPF: pass (google.com: domain of linux-nfs-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Subject: [PATCH v2 04/31] NFSD: Report count of freed filecache items
From:   Chuck Lever <chuck.lever@oracle.com>
To:     linux-nfs@vger.kernel.org, netdev@vger.kernel.org
Cc:     david@fromorbit.com, jlayton@redhat.com, tgraf@suug.ch
Date:   Tue, 28 Jun 2022 14:06:11 -0400
Message-ID: <165643957172.84360.1846401511560388071.stgit@manet.1015granger.net>
In-Reply-To: <165643915086.84360.2809940286726976517.stgit@manet.1015granger.net>
References: <165643915086.84360.2809940286726976517.stgit@manet.1015granger.net>
User-Agent: StGit/1.5.dev2+g9ce680a5
MIME-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: 7bit
Precedence: bulk

Surface the count of freed  nfsd_file items.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
 fs/nfsd/filecache.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/fs/nfsd/filecache.c b/fs/nfsd/filecache.c
index 3359df6c7ac0..c28e9577837d 100644
--- a/fs/nfsd/filecache.c
+++ b/fs/nfsd/filecache.c
@@ -44,6 +44,7 @@ struct nfsd_fcache_bucket {
 
 static DEFINE_PER_CPU(unsigned long, nfsd_file_cache_hits);
 static DEFINE_PER_CPU(unsigned long, nfsd_file_acquisitions);
+static DEFINE_PER_CPU(unsigned long, nfsd_file_releases);
 
 struct nfsd_fcache_disposal {
 	struct work_struct work;
@@ -202,6 +203,8 @@ nfsd_file_free(struct nfsd_file *nf)
 {
 	bool flush = false;
 
+	this_cpu_inc(nfsd_file_releases);
+
 	trace_nfsd_file_put_final(nf);
 	if (nf->nf_mark)
 		nfsd_file_mark_put(nf->nf_mark);
@@ -1070,7 +1073,7 @@ 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 long hits = 0, acquisitions = 0;
+	unsigned long hits = 0, acquisitions = 0, releases = 0;
 	unsigned int i, count = 0, longest = 0;
 	unsigned long lru = 0;
 
@@ -1092,6 +1095,7 @@ static int nfsd_file_cache_stats_show(struct seq_file *m, void *v)
 	for_each_possible_cpu(i) {
 		hits += per_cpu(nfsd_file_cache_hits, i);
 		acquisitions += per_cpu(nfsd_file_acquisitions, i);
+		releases += per_cpu(nfsd_file_releases, i);
 	}
 
 	seq_printf(m, "total entries: %u\n", count);
@@ -1099,6 +1103,7 @@ static int nfsd_file_cache_stats_show(struct seq_file *m, void *v)
 	seq_printf(m, "lru entries:   %lu\n", lru);
 	seq_printf(m, "cache hits:    %lu\n", hits);
 	seq_printf(m, "acquisitions:  %lu\n", acquisitions);
+	seq_printf(m, "releases:      %lu\n", releases);
 	return 0;
 }