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

[Christoph Lameter]

On Mon, 6 Aug 2007, Peter Zijlstra wrote:

> > > 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.
> 
> Do note that these are only PF_MEMALLOC allocations that will break the
> cpuset. And one can argue that these are not application allocation but
> system allocations.

This is global, global locking etc etc. On a large NUMA system this will 
cause significant delays. One fears that a livelock may result.

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