On Thu, 2007-10-25 at 17:28 -0700, Christoph Lameter wrote:That's what my "cpuset-independent interleave" patch does. David doesn't like the "null node mask" interface because it doesn't work with libnuma. I plan to fix that, but I'm chasing other issues. I should get back to the mempol work after today. What I like about the cpuset independent interleave is that the "policy remap" when cpusets are changed is a NO-OP--no need to change the policy. Just as "preferred local" policy chooses the node where the allocation occurs, my cpuset independent interleave patch interleaves across the set of nodes available at the time of the allocation. The application has to specifically ask for this behavior by the null/empty nodemask or the TBD libnuma API. IMO, this is the only reasonable interleave policy for apps running in dynamic cpusets. An aside: if David et al [at google] are using cpusets on fake numa for resource management [I don't know this is the case, but saw some discussions way back that indicate it might be?], then maybe this becomes less of an issue when control groups [a.k.a. containers] and memory resource controls come to fruition? Lee -
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