Messages in this thread | | | Date | Wed, 8 Aug 2012 08:55:26 +0100 | From | Mel Gorman <> | Subject | Re: [PATCH 2/6] mm: vmscan: Scale number of pages reclaimed by reclaim/compaction based on failures |
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On Wed, Aug 08, 2012 at 10:48:24AM +0900, Minchan Kim wrote: > Hi Mel, > > Just out of curiosity. > What's the problem did you see? (ie, What's the problem do this patch solve?)
Everythign in this series is related to the problem in the leader - high order allocation success rates are lower. This patch increases the success rates when allocating under load.
> AFAIUC, it seem to solve consecutive allocation success ratio through > getting several free pageblocks all at once in a process/kswapd > reclaim context. Right?
Only pageblocks if it is order-9 on x86, it reclaims an amount that depends on an allocation size. This only happens during reclaim/compaction context when we know that a high-order allocation has recently failed. The objective is to reclaim enough order-0 pages so that compaction can succeed again.
-- Mel Gorman SUSE Labs
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