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    SubjectRe: [PATCH 14/14] page-replace-kswapd-incmin.patch
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    On Fri, 2005-12-30 at 23:15 -0200, Marcelo Tosatti wrote:
    > On Fri, Dec 30, 2005 at 11:42:34PM +0100, Peter Zijlstra wrote:
    > >
    > > From: Nick Piggin <npiggin@suse.de>
    > >
    > > Explicitly teach kswapd about the incremental min logic instead of just scanning
    > > all zones under the first low zone. This should keep more even pressure applied
    > > on the zones.
    > >
    > > The new shrink_zone() logic exposes the very worst side of the current
    > > balance_pgdat() function. Without this patch reclaim is limited to ZONE_DMA.
    >
    > Can you please describe the issue with over protection of DMA zone you experienced?
    >
    > I'll see if I can reproduce it with Nick's standalone patch on top of vanilla, what
    > load was that?

    With the mdb bench the following behaviour was observed:
    (mem=128M)

    - PageCache would fill zone_normal
    - PageCache would fill zone_dma
    - reclaim starts
    - initially things look right
    - after a while zone_dma is reclaimed so fast that it frequently gets a
    full eviction (nr_resident == 0).
    - from this point onward zone_normal practiaclly sits idle and zone_dma
    goes wild with all the action.

    --
    Peter Zijlstra <a.p.zijlstra@chello.nl>

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