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| author | Christoph Hellwig <hch@infradead.org> | 2010-06-28 18:34:44 +0400 |
|---|---|---|
| committer | Alex Elder <aelder@sgi.com> | 2010-07-26 22:16:46 +0400 |
| commit | d4f7a5cbd5449a3d2097f601f588886ea7b70dc3 (patch) | |
| tree | 79df9adda1c9aa606f55df507db5b328ac58fd59 | |
| parent | 651701d71da4dc0ac607f17a638e77906f0d280e (diff) | |
| download | linux-d4f7a5cbd5449a3d2097f601f588886ea7b70dc3.tar.xz | |
xfs: allow writeback from kswapd
We only need disable I/O from direct or memcg reclaim.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>
| -rw-r--r-- | fs/xfs/linux-2.6/xfs_aops.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/fs/xfs/linux-2.6/xfs_aops.c b/fs/xfs/linux-2.6/xfs_aops.c index ed9c3db376c3..44ac7a0e2926 100644 --- a/fs/xfs/linux-2.6/xfs_aops.c +++ b/fs/xfs/linux-2.6/xfs_aops.c @@ -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; /* |