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authorMel Gorman <mgorman@suse.de>2013-10-07 11:29:01 +0100
committerIngo Molnar <mingo@kernel.org>2013-10-09 12:40:27 +0200
commit7a0f308337d11fd5caa9f845c6d08cc5d6067988 (patch)
tree91203c3f68fcc5d6a63dc7403fe43b1cc0fc3955 /kernel/sched/features.h
parent3a7053b3224f4a8b0e8184166190076593621617 (diff)
sched/numa: Resist moving tasks towards nodes with fewer hinting faults
Just as "sched: Favour moving tasks towards the preferred node" favours moving tasks towards nodes with a higher number of recorded NUMA hinting faults, this patch resists moving tasks towards nodes with lower faults. Signed-off-by: Mel Gorman <mgorman@suse.de> Reviewed-by: Rik van Riel <riel@redhat.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/1381141781-10992-24-git-send-email-mgorman@suse.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched/features.h')
-rw-r--r--kernel/sched/features.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/kernel/sched/features.h b/kernel/sched/features.h
index d9278ce2c4b4..5716929a2e3a 100644
--- a/kernel/sched/features.h
+++ b/kernel/sched/features.h
@@ -74,4 +74,12 @@ SCHED_FEAT(NUMA, false)
* balancing.
*/
SCHED_FEAT(NUMA_FAVOUR_HIGHER, true)
+
+/*
+ * NUMA_RESIST_LOWER will resist moving tasks towards nodes where a
+ * lower number of hinting faults have been recorded. As this has
+ * the potential to prevent a task ever migrating to a new node
+ * due to CPU overload it is disabled by default.
+ */
+SCHED_FEAT(NUMA_RESIST_LOWER, false)
#endif