Commit c81bf1c8 authored Mar 03, 2014 by Jaegeuk Kim

f2fs: fix to write node pages with WRITE_SYNC

This patch fixes performance regression of dbench reported by
Alex <hbx7d@yandex.com>.

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 <hbx7d@yandex.com&gt;.>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>

parent 9cf3c389

fs/f2fs/file.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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,
		};

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