This is a note to let you know that I've just added the patch titled
NFS: Add a cond_resched() to nfs_commit_release_pages()
to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: nfs-add-a-cond_resched-to-nfs_commit_release_pages.patch and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From 7f1bda447c9bd48b415acedba6b830f61591601f Mon Sep 17 00:00:00 2001
From: Trond Myklebust trond.myklebust@primarydata.com Date: Mon, 18 Dec 2017 14:39:13 -0500 Subject: NFS: Add a cond_resched() to nfs_commit_release_pages()
From: Trond Myklebust trond.myklebust@primarydata.com
commit 7f1bda447c9bd48b415acedba6b830f61591601f upstream.
The commit list can get very large, and so we need a cond_resched() in nfs_commit_release_pages() in order to ensure we don't hog the CPU for excessive periods of time.
Reported-by: Mike Galbraith efault@gmx.de Signed-off-by: Trond Myklebust trond.myklebust@primarydata.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- fs/nfs/write.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/fs/nfs/write.c +++ b/fs/nfs/write.c @@ -1806,6 +1806,8 @@ static void nfs_commit_release_pages(str set_bit(NFS_CONTEXT_RESEND_WRITES, &req->wb_context->flags); next: nfs_unlock_and_release_request(req); + /* Latency breaker */ + cond_resched(); } nfss = NFS_SERVER(data->inode); if (atomic_long_read(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH)
Patches currently in stable-queue which might be from trond.myklebust@primarydata.com are
queue-4.9/nfs-pnfs-fix-nfs_direct_req-ref-leak-when-i-o-falls-back-to-the-mds.patch queue-4.9/nfs-add-a-cond_resched-to-nfs_commit_release_pages.patch queue-4.9/nfs-commit-direct-writes-even-if-they-fail-partially.patch queue-4.9/nfs-fix-a-race-between-mmap-and-o_direct.patch