Re: [PATCH 3/4] mm: slub: Do not take expensive steps for SLUBsspeculative high-order allocations

From: Christoph Lameter
Date: Tue May 17 2011 - 13:52:26 EST

On Tue, 17 May 2011, Mel Gorman wrote:

> > That is not what I meant. I would like more higher order allocations to
> > succeed. That does not mean that slubs allocation methods and flags passed
> > have to stay the same. You can change the slub behavior if it helps.
> >
> In this particular patch, the success rate for high order allocations
> would likely decrease in low memory conditions albeit the latency when
> calling the page allocator will be lower and the disruption to the
> system will be less (no copying or reclaim of pages). My expectation
> would be that it's cheaper for SLUB to fall back than compact memory
> or reclaim pages even if this means a slab page is smaller until more
> memory is free. However, if the "goodness" criteria is high order
> allocation success rate, the patch shouldn't be merged.

The criteria is certainly overall system performance and not a high order
allocation rate.
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