Messages in this thread | | | Subject | Re: [PATCH 02/10] mm: system wide ALLOC_NO_WATERMARK | From | Peter Zijlstra <> | Date | Mon, 06 Aug 2007 21:31:30 +0200 |
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On Mon, 2007-08-06 at 12:11 -0700, Christoph Lameter wrote: > 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.
The only new lock is in SLUB, and I'm not aware of any regular PF_MEMALLOC paths using slab allocations, but I'll instrument the regular reclaim path to verify this.
The functionality this is aimed at is swap over network, and I doubt you'll be enabling that on these machines.
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