From: Jaegeuk Kim Date: Mon, 3 Mar 2014 02:28:40 +0000 (+0900) Subject: f2fs: fix to write node pages with WRITE_SYNC X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=c81bf1c84f6924678d088d68e131ff1f4d2d9002;p=deliverable%2Flinux.git f2fs: fix to write node pages with WRITE_SYNC This patch fixes performance regression of dbench reported by Alex . This issue was revealed by Phoronix tests results: http://www.phoronix.com/scan.php?page=article&item=linux_314_ssdfs&num=2 It turns out that we need to assign WRITE_SYNC to the node writes, if fsync is triggered. The performance numbers are like below, which is measured by Alex. 1. 355MB/s ext4 2. 225MB/s f2fs : WRITE for node writes 3. 525MB/s f2fs : WRITE_SYNC for node writes Reported-And-Tested-by: Alex . Signed-off-by: Jaegeuk Kim --- diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index 00f937ec4794..a4cc1d6bdd84 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -115,7 +115,7 @@ int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync) int ret = 0; bool need_cp = false; struct writeback_control wbc = { - .sync_mode = WB_SYNC_NONE, + .sync_mode = WB_SYNC_ALL, .nr_to_write = LONG_MAX, .for_reclaim = 0, };