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NFSD: Streamline the rare "found" case 

Move a rarely called function call site out of the hot path.

This is an exceptionally small improvement because the compiler
inlines most of the functions that nfsd_cache_lookup() calls.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2021-09-28 11:40:59 -04:00
parent 0f29ce32fb
commit add1511c38
1 changed files with 3 additions and 4 deletions
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7
fs/nfsd/nfscache.c
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@ -448,11 +448,8 @@ int nfsd_cache_lookup(struct svc_rqst *rqstp)
b = nfsd_cache_bucket_find(rqstp->rq_xid, nn); b = nfsd_cache_bucket_find(rqstp->rq_xid, nn);
spin_lock(&b->cache_lock); spin_lock(&b->cache_lock);
found = nfsd_cache_insert(b, rp, nn); found = nfsd_cache_insert(b, rp, nn);
if (found != rp) { if (found != rp)
nfsd_reply_cache_free_locked(NULL, rp, nn);
rp = found;
goto found_entry; goto found_entry;
}
nfsd_stats_rc_misses_inc(); nfsd_stats_rc_misses_inc();
rqstp->rq_cacherep = rp; rqstp->rq_cacherep = rp;
@ -470,8 +467,10 @@ out:
found_entry: found_entry:
/* We found a matching entry which is either in progress or done. */ /* We found a matching entry which is either in progress or done. */
nfsd_reply_cache_free_locked(NULL, rp, nn);
nfsd_stats_rc_hits_inc(); nfsd_stats_rc_hits_inc();
rtn = RC_DROPIT; rtn = RC_DROPIT;
rp = found;
/* Request being processed */ /* Request being processed */
if (rp->c_state == RC_INPROG) if (rp->c_state == RC_INPROG)