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

[Andrew Morton]

> On Thu, 06 Sep 2007 12:38:13 -0400 Rik van Riel <riel@xxxxxxxxxx> 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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