Re: [PATCH 6/8] fs,xfs: Allow kswapd to writeback pages

Christoph Hellwig
2010-07-19T14:20:55Z

On Mon, Jul 19, 2010 at 02:11:28PM +0100, Mel Gorman wrote:
> As only kswapd and memcg are writing back pages, there should be no
> danger of overflowing the stack. Allow the writing back of dirty pages
> in xfs from the VM.

As pointed out during the discussion on one of your previous post memcg
does pose a huge risk of stack overflows. In the XFS tree we've already
relaxed the check to allow writeback from kswapd, and until the memcg
situation we'll need to keep that check.