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authorChristoph Hellwig <hch@lst.de>2010-06-17 08:54:16 +0200
committerJens Axboe <jaxboe@fusionio.com>2010-08-07 18:15:44 +0200
commit41f2df62894bfcd3bf868af916b32b90aa7168dc (patch)
treeb582399975cd1cf19aa8b6e67623f252b7cada85 /net/rose/rose_out.c
parent01b6b67edabe864391163dc6405e2cb454f108db (diff)
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block: BARRIER request should imply SYNC
A barrier request should by defintion have priority in get_request and let the queue be unplugged immediately as it's blocking all forward progress due to the queue draining. Most filesystems already get this implicitly by the way how submit_bh treats the buffer_ordered flag, and gfs2 sets it explicitly. But btrfs and XFS are still forgetting to set the flag, as is blkdev_issue_flush and some places in DM/MD. For XFS on metadata heavy workloads this gives a consistent speedup in the 2-3% range. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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