linux-kernel - Re: [PATCH] prevent kswapd from freeing excessive amounts of lowmem

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Date:	Thu, 6 Sep 2007 15:34:26 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Rik van Riel <riel@...hat.com>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	safari-kernel@...ari.iki.fi
Subject: Re: [PATCH] prevent kswapd from freeing excessive amounts of lowmem

> On Thu, 06 Sep 2007 12:38:13 -0400 Rik van Riel <riel@...hat.com> wrote:
> Andrew Morton wrote:
> 

(What happened to the other stuff I said?)

> > I guess for a very small upper zone and a very large lower zone this could
> > still put the scan balancing out of whack, fixable by a smarter version of
> > "8*zone->pages_high" but it doesn't seem very likely that this will affect
> > things much.
> > 
> > Why doesn't direct reclaim need similar treatment?
> 
> Because we only go into the direct reclaim path once
> every zone is at or below zone->pages_low, and the
> direct reclaim path will exit once we have freed more
> than swap_cluster_max pages.
> 

hm.  Now I need to remember why direct-reclaim does that :(
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