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authorChristoph Hellwig <hch@infradead.org>2010-09-09 16:38:10 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-09-09 18:57:25 -0700
commit8f2ae0faa3a119158c4dcfe89926d6fad5f5332c (patch)
tree720272512fd0dfd1d865d2dc64b30fed811f2d13 /include/linux
parentb73d7fcecd93dc15eaa3c45c8c587b613f6673c4 (diff)
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swap: do not send discards as barriers
The swap code already uses synchronous discards, no need to add I/O barriers. This fixes the worst of the terrible slowdown in swap allocation for hibernation, reported on 2.6.35 by Nigel Cunningham; but does not entirely eliminate that regression. [tj@kernel.org: superflous newlines removed] Signed-off-by: Christoph Hellwig <hch@lst.de> Tested-by: Nigel Cunningham <nigel@tuxonice.net> Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Hugh Dickins <hughd@google.com> Cc: Jens Axboe <jaxboe@fusionio.com> Cc: James Bottomley <James.Bottomley@hansenpartnership.com> Cc: "Martin K. Petersen" <martin.petersen@oracle.com> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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