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NFSD: Trace filecache opens

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[ Upstream commit 0122e882119ddbd9efa6edfeeac3f5c704a7aeea ]

Instrument calls to nfsd_open_verified() to get a sense of the
filecache hit rate.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Chuck Lever 2022-03-27 16:42:20 -04:00 • committed by Ksawlii
parent 09e30c0ad5
commit 47ef8b0821
2 changed files with 31 additions and 2 deletions
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5
fs/nfsd/filecache.c
View file

@ -996,10 +996,11 @@ open_file:
nf->nf_mark = nfsd_file_mark_find_or_create(nf); nf->nf_mark = nfsd_file_mark_find_or_create(nf);
if (nf->nf_mark) { if (nf->nf_mark) {
if (open) if (open) {
status = nfsd_open_verified(rqstp, fhp, may_flags, status = nfsd_open_verified(rqstp, fhp, may_flags,
&nf->nf_file); &nf->nf_file);
else trace_nfsd_file_open(nf, status);
} else
status = nfs_ok; status = nfs_ok;
} else } else
status = nfserr_jukebox; status = nfserr_jukebox;

28
fs/nfsd/trace.h
View file

@ -795,6 +795,34 @@ TRACE_EVENT(nfsd_file_acquire,
__entry->nf_file, __entry->status) __entry->nf_file, __entry->status)
); );
TRACE_EVENT(nfsd_file_open,
TP_PROTO(struct nfsd_file *nf, __be32 status),
TP_ARGS(nf, status),
TP_STRUCT__entry(
__field(unsigned int, nf_hashval)
__field(void *, nf_inode) /* cannot be dereferenced */
__field(int, nf_ref)
__field(unsigned long, nf_flags)
__field(unsigned long, nf_may)
__field(void *, nf_file) /* cannot be dereferenced */
),
TP_fast_assign(
__entry->nf_hashval = nf->nf_hashval;
__entry->nf_inode = nf->nf_inode;
__entry->nf_ref = refcount_read(&nf->nf_ref);
__entry->nf_flags = nf->nf_flags;
__entry->nf_may = nf->nf_may;
__entry->nf_file = nf->nf_file;
),
TP_printk("hash=0x%x inode=%p ref=%d flags=%s may=%s file=%p",
__entry->nf_hashval,
__entry->nf_inode,
__entry->nf_ref,
show_nf_flags(__entry->nf_flags),
show_nfsd_may_flags(__entry->nf_may),
__entry->nf_file)
)
DECLARE_EVENT_CLASS(nfsd_file_search_class, DECLARE_EVENT_CLASS(nfsd_file_search_class,
TP_PROTO(struct inode *inode, unsigned int hash, int found), TP_PROTO(struct inode *inode, unsigned int hash, int found),
TP_ARGS(inode, hash, found), TP_ARGS(inode, hash, found),