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. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
