Hello, Michal.

On Wed, Nov 14, 2012 at 09:51:29AM +0100, Michal Hocko wrote:
> >     reclaim(root);
> >     for_each_descendent_pre()
> >             reclaim(descendant);
> 
> We cannot do for_each_descendent_pre here because we do not iterate
> through the whole hierarchy all the time. Check shrink_zone.

I'm a bit confused.  Why would that make any difference?  Shouldn't it
be just able to test the condition and continue?

Thanks.

-- 
tejun
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