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authorMel Gorman <mgorman@suse.de>2013-10-07 11:29:11 +0100
committerIngo Molnar <mingo@kernel.org>2013-10-09 12:40:40 +0200
commit6b9a7460b6baf6c77fc3d23d927ddfc3f3f05bf3 (patch)
treeb35642ac95837435740ee6f584ca6d169795891d /include/linux/sched.h
parent58d081b5082dd85e02ac9a1fb151d97395340a09 (diff)
sched/numa: Retry migration of tasks to CPU on a preferred node
When a preferred node is selected for a tasks there is an attempt to migrate the task to a CPU there. This may fail in which case the task will only migrate if the active load balancer takes action. This may never happen if the conditions are not right. This patch will check at NUMA hinting fault time if another attempt should be made to migrate the task. It will only make an attempt once every five seconds. 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/1381141781-10992-34-git-send-email-mgorman@suse.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux/sched.h')
-rw-r--r--include/linux/sched.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index d946195eec10..14251a8ff2ea 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1341,6 +1341,7 @@ struct task_struct {
int numa_migrate_seq;
unsigned int numa_scan_period;
unsigned int numa_scan_period_max;
+ unsigned long numa_migrate_retry;
u64 node_stamp; /* migration stamp */
struct callback_head numa_work;