From: Trond Myklebust trond.myklebust@primarydata.com
This patch has been added to the 4.1 stable tree. If you have any objections, please let us know.
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[ Upstream commit 7f1bda447c9bd48b415acedba6b830f61591601f ]
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 Cc: stable@vger.kernel.org Signed-off-by: Trond Myklebust trond.myklebust@primarydata.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com --- fs/nfs/write.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/fs/nfs/write.c b/fs/nfs/write.c index 51af4fff890f..209b39ef69dd 100644 --- a/fs/nfs/write.c +++ b/fs/nfs/write.c @@ -1728,6 +1728,8 @@ static void nfs_commit_release_pages(struct nfs_commit_data *data) 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)