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authorRik van Riel <riel@redhat.com>2014-10-09 17:27:47 -0400
committerIngo Molnar <mingo@kernel.org>2014-10-28 10:47:52 +0100
commit9de05d48711cd5314920ed05f873d84eaf66ccf1 (patch)
treebd03884dd93b59f151b78c674f444354fb46a918 /include/trace
parent54009416ac3b5f219c0df68559ce534287ae97b1 (diff)
sched/numa: Check all nodes when placing a pseudo-interleaved group
In pseudo-interleaved numa_groups, all tasks try to relocate to the group's preferred_nid. When a group is spread across multiple NUMA nodes, this can lead to tasks swapping their location with other tasks inside the same group, instead of swapping location with tasks from other NUMA groups. This can keep NUMA groups from converging. Examining all nodes, when dealing with a task in a pseudo-interleaved NUMA group, avoids this problem. Note that only CPUs in nodes that improve the task or group score are examined, so the loop isn't too bad. Tested-by: Vinod Chegu <chegu_vinod@hp.com> Signed-off-by: Rik van Riel <riel@redhat.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: "Vinod Chegu" <chegu_vinod@hp.com> Cc: mgorman@suse.de Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: http://lkml.kernel.org/r/20141009172747.0d97c38c@annuminas.surriel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
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