[PATCH 02/17] xfs: skip writeback from reclaim context

[Christoph Hellwig]

On Wed, Jun 02, 2010 at 02:39:57PM +1000, Dave Chinner wrote:
> Also worth thinking about is if should be checked in
> xfs_vm_releasepage() as well to avoid the same stack issues if it
> triggers allocation...

I agree this is a potential problem as well.

I did some QA runs with this thrown in, and it causes massive OOM killer
wreckage in xfstests.  I've also cross-checked btrfs and ext4 and
neither one skips ->releasepage from reclaim context.