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swap: do not send discards as barriers

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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.

[[email protected]: superflous newlines removed]
Signed-off-by: Christoph Hellwig <[email protected]>
Tested-by: Nigel Cunningham <[email protected]>
Signed-off-by: Tejun Heo <[email protected]>
Signed-off-by: Hugh Dickins <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: James Bottomley <[email protected]>
Cc: "Martin K. Petersen" <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Christoph Hellwig 2010-09-09 16:38:10 -07:00 • committed by Linus Torvalds
commit 8f2ae0faa3
1 changed files with 3 additions and 6 deletions
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9
mm/swapfile.c
View file

@ -139,8 +139,7 @@ static int discard_swap(struct swap_info_struct *si)
nr_blocks = ((sector_t)se->nr_pages - 1) << (PAGE_SHIFT - 9);
if (nr_blocks) {
err = blkdev_issue_discard(si->bdev, start_block,
nr_blocks, GFP_KERNEL,
BLKDEV_IFL_WAIT | BLKDEV_IFL_BARRIER);
nr_blocks, GFP_KERNEL, BLKDEV_IFL_WAIT);
if (err)
return err;
cond_resched();
@ -151,8 +150,7 @@ static int discard_swap(struct swap_info_struct *si)
nr_blocks = (sector_t)se->nr_pages << (PAGE_SHIFT - 9);
err = blkdev_issue_discard(si->bdev, start_block,
nr_blocks, GFP_KERNEL,
BLKDEV_IFL_WAIT | BLKDEV_IFL_BARRIER);
nr_blocks, GFP_KERNEL, BLKDEV_IFL_WAIT);
if (err)
break;
@ -191,8 +189,7 @@ static void discard_swap_cluster(struct swap_info_struct *si,
start_block <<= PAGE_SHIFT - 9;
nr_blocks <<= PAGE_SHIFT - 9;
if (blkdev_issue_discard(si->bdev, start_block,
nr_blocks, GFP_NOIO, BLKDEV_IFL_WAIT |
BLKDEV_IFL_BARRIER))
nr_blocks, GFP_NOIO, BLKDEV_IFL_WAIT))
break;
}