5.15-stable review patch. If anyone has any objections, please let me know.
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From: Chuck Lever chuck.lever@oracle.com
[ Upstream commit 29d4bdbbb910f33d6058d2c51278f00f656df325 ]
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.
Reviewed-by: Jeff Layton jlayton@kernel.org Signed-off-by: Chuck Lever chuck.lever@oracle.com --- 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 377d8211200ff..5a09b76ae25a8 100644 --- a/fs/nfsd/filecache.c +++ b/fs/nfsd/filecache.c @@ -42,6 +42,7 @@ 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; @@ -954,6 +955,8 @@ nfsd_do_file_acquire(struct svc_rqst *rqstp, struct svc_fh *fhp, status = nfserrno(nfsd_open_break_lease(file_inode(nf->nf_file), may_flags)); out: if (status == nfs_ok) { + if (open) + this_cpu_inc(nfsd_file_acquisitions); *pnf = nf; } else { nfsd_file_put(nf); @@ -1046,8 +1049,9 @@ 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 @@ -1064,13 +1068,16 @@ 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; }