Re: [PATCH] mm: disallow direct reclaim page writeback

[Christoph Hellwig]

On Sun, Apr 18, 2010 at 12:31:09PM -0400, Andrew Morton wrote:
> Yeah, but it's all bandaids.  The first thing we should do is work out
> why writeout-off-the-LRU increased so much and fix that.
> 
> Handing writeout off to separate threads might be used to solve the
> stack consumption problem but we shouldn't use it to "solve" the
> excess-writeout-from-page-reclaim problem.

I think both of them are really serious issue.  Exposing the whole
stack and lock problems with direct reclaim are a bit of a positive
side-effect os the writeout tuning messup.  Without it the problems
would still be just as harmfull, just happenening even less often and
thus getting even less attention.

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