Patch "NFSD: Report the number of items evicted by the LRU walk" has been added to the 5.10-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    NFSD: Report the number of items evicted by the LRU walk

to the 5.10-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-the-number-of-items-evicted-by-the-lru-w.patch
and it can be found in the queue-5.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 3217fea59fae67c4e565ad08252ee80cbd295fe0
Author: Chuck Lever <chuck.lever@xxxxxxxxxx>
Date:   Fri Jul 8 14:24:38 2022 -0400

    NFSD: Report the number of items evicted by the LRU walk
    
    [ Upstream commit 94660cc19c75083af046b0f8362e3d3bc2eba21d ]
    
    Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx>
    Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/fs/nfsd/filecache.c b/fs/nfsd/filecache.c
index 1d94491e5ddad..e5bd9f06492c8 100644
--- a/fs/nfsd/filecache.c
+++ b/fs/nfsd/filecache.c
@@ -45,6 +45,7 @@ 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);
 static DEFINE_PER_CPU(unsigned long, nfsd_file_total_age);
+static DEFINE_PER_CPU(unsigned long, nfsd_file_evictions);
 
 struct nfsd_fcache_disposal {
 	struct work_struct work;
@@ -445,6 +446,7 @@ nfsd_file_lru_cb(struct list_head *item, struct list_lru_one *lru,
 		goto out_skip;
 
 	list_lru_isolate_move(lru, &nf->nf_lru, head);
+	this_cpu_inc(nfsd_file_evictions);
 	return LRU_REMOVED;
 out_skip:
 	return LRU_SKIP;
@@ -475,9 +477,11 @@ static void
 nfsd_file_gc(void)
 {
 	LIST_HEAD(dispose);
+	unsigned long ret;
 
-	list_lru_walk(&nfsd_file_lru, nfsd_file_lru_cb,
-		      &dispose, LONG_MAX);
+	ret = list_lru_walk(&nfsd_file_lru, nfsd_file_lru_cb,
+			    &dispose, LONG_MAX);
+	trace_nfsd_file_gc_removed(ret, list_lru_count(&nfsd_file_lru));
 	nfsd_file_gc_dispose_list(&dispose);
 }
 
@@ -502,6 +506,7 @@ nfsd_file_lru_scan(struct shrinker *s, struct shrink_control *sc)
 
 	ret = list_lru_shrink_walk(&nfsd_file_lru, sc,
 				   nfsd_file_lru_cb, &dispose);
+	trace_nfsd_file_shrinker_removed(ret, list_lru_count(&nfsd_file_lru));
 	nfsd_file_gc_dispose_list(&dispose);
 	return ret;
 }
@@ -1064,7 +1069,7 @@ 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, releases = 0;
+	unsigned long hits = 0, acquisitions = 0, releases = 0, evictions = 0;
 	unsigned int i, count = 0, longest = 0;
 	unsigned long lru = 0, total_age = 0;
 
@@ -1088,6 +1093,7 @@ static int nfsd_file_cache_stats_show(struct seq_file *m, void *v)
 		acquisitions += per_cpu(nfsd_file_acquisitions, i);
 		releases += per_cpu(nfsd_file_releases, i);
 		total_age += per_cpu(nfsd_file_total_age, i);
+		evictions += per_cpu(nfsd_file_evictions, i);
 	}
 
 	seq_printf(m, "total entries: %u\n", count);
@@ -1096,6 +1102,7 @@ static int nfsd_file_cache_stats_show(struct seq_file *m, void *v)
 	seq_printf(m, "cache hits:    %lu\n", hits);
 	seq_printf(m, "acquisitions:  %lu\n", acquisitions);
 	seq_printf(m, "releases:      %lu\n", releases);
+	seq_printf(m, "evictions:     %lu\n", evictions);
 	if (releases)
 		seq_printf(m, "mean age (ms): %ld\n", total_age / releases);
 	else
diff --git a/fs/nfsd/trace.h b/fs/nfsd/trace.h
index 5c2292a1892cc..b373a161e862b 100644
--- a/fs/nfsd/trace.h
+++ b/fs/nfsd/trace.h
@@ -860,6 +860,35 @@ TRACE_EVENT(nfsd_file_fsnotify_handle_event,
 			__entry->nlink, __entry->mode, __entry->mask)
 );
 
+DECLARE_EVENT_CLASS(nfsd_file_lruwalk_class,
+	TP_PROTO(
+		unsigned long removed,
+		unsigned long remaining
+	),
+	TP_ARGS(removed, remaining),
+	TP_STRUCT__entry(
+		__field(unsigned long, removed)
+		__field(unsigned long, remaining)
+	),
+	TP_fast_assign(
+		__entry->removed = removed;
+		__entry->remaining = remaining;
+	),
+	TP_printk("%lu entries removed, %lu remaining",
+		__entry->removed, __entry->remaining)
+);
+
+#define DEFINE_NFSD_FILE_LRUWALK_EVENT(name)				\
+DEFINE_EVENT(nfsd_file_lruwalk_class, name,				\
+	TP_PROTO(							\
+		unsigned long removed,					\
+		unsigned long remaining					\
+	),								\
+	TP_ARGS(removed, remaining))
+
+DEFINE_NFSD_FILE_LRUWALK_EVENT(nfsd_file_gc_removed);
+DEFINE_NFSD_FILE_LRUWALK_EVENT(nfsd_file_shrinker_removed);
+
 #include "cache.h"
 
 TRACE_DEFINE_ENUM(RC_DROPIT);