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Commit d4f7a5cb authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Alex Elder
Browse files

xfs: allow writeback from kswapd 



We only need disable I/O from direct or memcg reclaim.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarAlex Elder <aelder@sgi.com>
parent 651701d7

fs/xfs/linux-2.6/xfs_aops.c

+4 −5
Original line number Diff line number Diff line
@@ -1049,16 +1049,15 @@ xfs_vm_writepage( 
	/*

	 * Refuse to write the page out if we are called from reclaim context.

	 *

	 * This is primarily to avoid stack overflows when called from deep

	 * used stacks in random callers for direct reclaim, but disabling

	 * reclaim for kswap is a nice side-effect as kswapd causes rather

	 * suboptimal I/O patters, too.

	 * This avoids stack overflows when called from deeply used stacks in

	 * random callers for direct reclaim or memcg reclaim.  We explicitly

	 * allow reclaim from kswapd as the stack usage there is relatively low.

	 *

	 * This should really be done by the core VM, but until that happens

	 * filesystems like XFS, btrfs and ext4 have to take care of this

	 * by themselves.

	 */

	if (current->flags & PF_MEMALLOC)

	if ((current->flags & (PF_MEMALLOC|PF_KSWAPD)) == PF_MEMALLOC)

		goto out_fail;



	/*