Xueqian Hu has uploaded this change for review. ( https://review.gerrithub.io/c/ffilz/nfs-ganesha/+/1240515?usp=email ) Change subject: SAL: split exp_state_list onto its own rwlock to cut PUTFH/OPEN contention ...................................................................... SAL: split exp_state_list onto its own rwlock to cut PUTFH/OPEN contention exp_lock guards both the read-hot perms/client check on every PUTFH (export_check_access) and the write-hot exp_state_list churn on every OPEN/CLOSE (state_add/state_del), so the two convoy on a busy export despite touching disjoint data. Give exp_state_list its own rwlock (exp_state_lock); exp_lock still protects perms/clients and the NLM lists. The two sets were already disjoint so no atomicity is lost, and exp_state_lock is a leaf lock (only state_mutex nests under it). Change-Id: I26c68ce8039f1e84d2a69560f746900212a62d1b Signed-off-by: xueqian.hu <xh140312(a)outlook.com&gt; --- M src/SAL/nfs4_state.c M src/include/export_mgr.h M src/support/export_mgr.c 3 files changed, 17 insertions(+), 13 deletions(-) git pull ssh://review.gerrithub.io:29418/ffilz/nfs-ganesha refs/changes/15/1240515/1 -- To view, visit https://review.gerrithub.io/c/ffilz/nfs-ganesha/+/1240515?usp=email To unsubscribe, or for help writing mail filters, visit https://review.gerrithub.io/settings?usp=email Gerrit-MessageType: newchange Gerrit-Project: ffilz/nfs-ganesha Gerrit-Branch: next Gerrit-Change-Id: I26c68ce8039f1e84d2a69560f746900212a62d1b Gerrit-Change-Number: 1240515 Gerrit-PatchSet: 1 Gerrit-Owner: Xueqian Hu <xh140312(a)outlook.com&gt;