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authorChris Mason <clm@fb.com>2015-09-18 20:35:08 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2015-09-20 04:50:19 +0300
commit590dca3a71875461e8fea3013af74386945191b2 (patch)
tree9bd3b4a9de42fb0547fce6fb1f336af3d89e86d8 /fs/f2fs
parent00ade1f553e3b947cd26228392ee47d6f0f550e1 (diff)
downloadlinux-590dca3a71875461e8fea3013af74386945191b2.tar.xz
fs-writeback: unplug before cond_resched in writeback_sb_inodes
Commit 505a666ee3fc ("writeback: plug writeback in wb_writeback() and writeback_inodes_wb()") has us holding a plug during writeback_sb_inodes, which increases the merge rate when relatively contiguous small files are written by the filesystem. It helps both on flash and spindles. For an fs_mark workload creating 4K files in parallel across 8 drives, this commit improves performance ~9% more by unplugging before calling cond_resched(). cond_resched() doesn't trigger an implicit unplug, so explicitly getting the IO down to the device before scheduling reduces latencies for anyone waiting on clean pages. It also cuts down on how often we use kblockd to unplug, which means less work bouncing from one workqueue to another. Many more details about how we got here: https://lkml.org/lkml/2015/9/11/570 Signed-off-by: Chris Mason <clm@fb.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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