From b0ac1bd2bbfd5e500432714e55a791c4d394047f Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Mon, 28 Dec 2015 13:30:42 -0500 Subject: NFS: Background flush should not be low priority Background flush is needed in order to satisfy the global page limits. Don't subvert by reducing the priority. This should also address a write starvation issue that was reported by Neil Brown. Signed-off-by: Trond Myklebust --- fs/nfs/write.c | 2 -- 1 file changed, 2 deletions(-) (limited to 'fs/nfs/write.c') diff --git a/fs/nfs/write.c b/fs/nfs/write.c index 7b9316406930..7a4fe7d82e65 100644 --- a/fs/nfs/write.c +++ b/fs/nfs/write.c @@ -247,8 +247,6 @@ static int wb_priority(struct writeback_control *wbc) return FLUSH_HIGHPRI | FLUSH_STABLE; if (wbc->sync_mode == WB_SYNC_ALL) ret = FLUSH_COND_STABLE; - if (wbc->for_kupdate || wbc->for_background) - ret |= FLUSH_LOWPRI; return ret; } -- cgit v1.2.3 From 494f74a26c14d10bb26a45218b50feb75bdedeca Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Mon, 28 Dec 2015 13:34:59 -0500 Subject: NFS: Flush reclaim writes using FLUSH_COND_STABLE If there are already writes queued up for commit, then don't flush just this page even if it is a reclaim issue. Signed-off-by: Trond Myklebust --- fs/nfs/write.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'fs/nfs/write.c') diff --git a/fs/nfs/write.c b/fs/nfs/write.c index 7a4fe7d82e65..1ea35f88eadb 100644 --- a/fs/nfs/write.c +++ b/fs/nfs/write.c @@ -244,7 +244,7 @@ static int wb_priority(struct writeback_control *wbc) { int ret = 0; if (wbc->for_reclaim) - return FLUSH_HIGHPRI | FLUSH_STABLE; + return FLUSH_HIGHPRI | FLUSH_COND_STABLE; if (wbc->sync_mode == WB_SYNC_ALL) ret = FLUSH_COND_STABLE; return ret; -- cgit v1.2.3