Count the number of successful acquisitions that did not create a
file (ie, acquisitions that do not result in a compulsory cache
miss). This count can be compared directly with the reported hit
count to compute a hit ratio.
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
fs/nfsd/filecache.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/fs/nfsd/filecache.c b/fs/nfsd/filecache.c
index a0234d194ec1..3359df6c7ac0 100644
--- a/fs/nfsd/filecache.c
+++ b/fs/nfsd/filecache.c
@@ -43,6 +43,7 @@ struct nfsd_fcache_bucket {
};
static DEFINE_PER_CPU(unsigned long, nfsd_file_cache_hits);
+static DEFINE_PER_CPU(unsigned long, nfsd_file_acquisitions);
struct nfsd_fcache_disposal {
struct work_struct work;
@@ -975,6 +976,8 @@ nfsd_do_file_acquire(struct svc_rqst *rqstp, struct svc_fh *fhp,
}
out:
if (status == nfs_ok) {
+ if (open)
+ this_cpu_inc(nfsd_file_acquisitions);
*pnf = nf;
} else {
nfsd_file_put(nf);
@@ -1067,8 +1070,9 @@ 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 int i, count = 0, longest = 0;
- unsigned long lru = 0, hits = 0;
+ unsigned long lru = 0;
/*
* No need for spinlocks here since we're not terribly interested in
@@ -1085,13 +1089,16 @@ static int nfsd_file_cache_stats_show(struct seq_file *m, void *v)
}
mutex_unlock(&nfsd_mutex);
- for_each_possible_cpu(i)
+ for_each_possible_cpu(i) {
hits += per_cpu(nfsd_file_cache_hits, i);
+ acquisitions += per_cpu(nfsd_file_acquisitions, i);
+ }
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);
+ seq_printf(m, "acquisitions: %lu\n", acquisitions);
return 0;
}
