From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:38925 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751593AbbJQURo (ORCPT ); Sat, 17 Oct 2015 16:17:44 -0400 Subject: Patch "NFS: Fix a write performance regression" has been added to the 4.2-stable tree To: trond.myklebust@primarydata.com, gregkh@linuxfoundation.org, jlayton@primarydata.com Cc: , From: Date: Sat, 17 Oct 2015 13:17:43 -0700 Message-ID: <14451130637197@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled NFS: Fix a write performance regression to the 4.2-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: nfs-fix-a-write-performance-regression.patch and it can be found in the queue-4.2 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From 8fa4592a14ebb3c22a21d846d1e4f65dab7d1a7c Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Thu, 1 Oct 2015 18:38:27 -0400 Subject: NFS: Fix a write performance regression From: Trond Myklebust commit 8fa4592a14ebb3c22a21d846d1e4f65dab7d1a7c upstream. If all other conditions in nfs_can_extend_write() are met, and there are no locks, then we should be able to assume close-to-open semantics and the ability to extend our write to cover the whole page. With this patch, the xfstests generic/074 test completes in 242s instead of >1400s on my test rig. Fixes: bd61e0a9c852 ("locks: convert posix locks to file_lock_context") Cc: Jeff Layton Signed-off-by: Trond Myklebust Signed-off-by: Greg Kroah-Hartman --- fs/nfs/write.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/fs/nfs/write.c +++ b/fs/nfs/write.c @@ -1223,7 +1223,7 @@ static int nfs_can_extend_write(struct f return 1; if (!flctx || (list_empty_careful(&flctx->flc_flock) && list_empty_careful(&flctx->flc_posix))) - return 0; + return 1; /* Check to see if there are whole file write locks */ ret = 0; Patches currently in stable-queue which might be from trond.myklebust@primarydata.com are queue-4.2/nfs-fix-pg_test-page-count-calculation.patch queue-4.2/nfs-do-cleanup-before-resetting-pageio-read-write-to-mds.patch queue-4.2/nfs-fix-a-write-performance-regression.patch queue-4.2/nfsv4-recovery-of-recalled-read-delegations-is-broken.patch queue-4.2/nfs-fix-v4.2-seek-on-files-over-2-gigs.patch