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b07bc39a23
freebsd-nq/sys/fs/nfsserver
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Rick Macklem b07bc39a23 Avoid the overhead of acquiring a lock in nfsrv_checkgetattr() when 
there are no write delegations issued.

manu@ reported on the freebsd-current@ mailing list that there was
a significant performance hit in nfsrv_checkgetattr() caused by
the acquisition/release of a state lock, even when there were no
write delegations issued.
This patch add a count of outstanding issued write delegations to the
NFSv4 server. This count allows nfsrv_checkgetattr() to return without
acquiring any lock when the count is 0, avoiding the performance hit
for the case where no write delegations are issued.

Reported by:	manu
Reviewed by:	kib
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D13327
2017-12-04 21:50:27 +00:00
..
nfs_fha_new.c sys/fs: further adoption of SPDX licensing ID tags. 2017-11-27 15:15:37 +00:00
nfs_fha_new.h sys/fs: further adoption of SPDX licensing ID tags. 2017-11-27 15:15:37 +00:00
nfs_nfsdcache.c sys: further adoption of SPDX licensing ID tags. 2017-11-20 19:43:44 +00:00
nfs_nfsdkrpc.c sys: further adoption of SPDX licensing ID tags. 2017-11-20 19:43:44 +00:00
nfs_nfsdport.c sys: further adoption of SPDX licensing ID tags. 2017-11-20 19:43:44 +00:00
nfs_nfsdserv.c sys: further adoption of SPDX licensing ID tags. 2017-11-20 19:43:44 +00:00
nfs_nfsdsocket.c sys: further adoption of SPDX licensing ID tags. 2017-11-20 19:43:44 +00:00
nfs_nfsdstate.c Avoid the overhead of acquiring a lock in nfsrv_checkgetattr() when 2017-12-04 21:50:27 +00:00
nfs_nfsdsubs.c sys: further adoption of SPDX licensing ID tags. 2017-11-20 19:43:44 +00:00