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NFSD: Report count of calls to nfsd_file_acquire() 

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>
This commit is contained in:
Chuck Lever 2022-07-08 14:23:59 -04:00
parent 0fd244c115
commit 29d4bdbbb9
1 changed files with 9 additions and 2 deletions
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11
fs/nfsd/filecache.c
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@ -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;
@ -955,6 +956,8 @@ wait_for_construction:
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);
@ -1047,8 +1050,9 @@ 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
@ -1065,13 +1069,16 @@ 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;
}