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

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Message-ID: <46E02CF5.3020301@redhat.com>
Date:	Thu, 06 Sep 2007 12:38:13 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
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

Andrew Morton wrote:

> 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.

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