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SubjectRe: 2.4.>=13 VM/kswapd/shmem/Oracle issue (was Re: Google's mm problems)
On Sun, 18 Nov 2001, Andrea Arcangeli wrote:

> On Sun, Nov 18, 2001 at 07:17:02AM +0100, Mike Galbraith wrote:
> > On Sat, 17 Nov 2001, Andrea Arcangeli wrote:
> >
> > > If all your hardware is PCI nobody will make an allocation from the
> > > ZONE_DMA classzone and so kswapd will never loop on the ZONE_DMA, as
> > > instead can happen with -ac as soon as the ZONE_DMA becomes unfreeable
> > > and under the low watermark (and "unfreeable" of course also means all
> > > anon not locked memory but no swap installed in the machine).
> >
> > We don't fallback to ZONE_DMA anymore? (good)
> we still fallback on the ZONE_DMA, otherwise mem=17m wouldn't boot :)


> what we don't do is to try to balance the dma zone if nobody is asking
> memory explicitly from the dma zone [isa users].

Ah.. all clear. Thanks.


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