Re: [PATCH 02/10] mm: system wide ALLOC_NO_WATERMARK

[Daniel Phillips]

On Monday 06 August 2007 11:11, Christoph Lameter wrote:
> On Mon, 6 Aug 2007, Peter Zijlstra wrote:
> > Change ALLOC_NO_WATERMARK page allocation such that dipping into
> > the reserves becomes a system wide event.
>
> Shudder. That can just be a desaster for NUMA. Both performance wise
> and logic wise. One cpuset being low on memory should not affect
> applications in other cpusets.

Currently your system likely would have died here, so ending up with a 
reserve page temporarily on the wrong node is already an improvement. 

I agree that the reserve pool should be per-node in the end, but I do 
not think that serves the interest of simplifying the initial patch 
set.  How about a numa performance patch that adds onto the end of 
Peter's series?

Regards,

Daniel
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