Messages in this thread | | | Subject | Re: [PATCH 14/14] page-replace-kswapd-incmin.patch | From | Peter Zijlstra <> | Date | Sat, 31 Dec 2005 10:40:40 +0100 |
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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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