Commit 06ea5e03 authored Oct 07, 2013 by Rik van Riel Committed by Ingo Molnar Oct 09, 2013

sched/numa: Increment numa_migrate_seq when task runs in correct location



When a task is already running on its preferred node, increment
numa_migrate_seq to indicate that the task is settled if migration is
temporarily disabled, and memory should migrate towards it.

Signed-off-by: Rik van Riel <riel@redhat.com>
[ Only increment migrate_seq if migration temporarily disabled. ]
Signed-off-by: Mel Gorman <mgorman@suse.de>
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/1381141781-10992-35-git-send-email-mgorman@suse.de


Signed-off-by: Ingo Molnar <mingo@kernel.org>

parent 6b9a7460

kernel/sched/fair.c

+9 −1

Original line number	Diff line number	Diff line
		@@ -1016,8 +1016,16 @@ static void numa_migrate_preferred(struct task_struct *p)
		{
		/* Success if task is already running on preferred CPU */
		p->numa_migrate_retry = 0;
		if (cpu_to_node(task_cpu(p)) == p->numa_preferred_nid)
		if (cpu_to_node(task_cpu(p)) == p->numa_preferred_nid) {
		/*
		* If migration is temporarily disabled due to a task migration
		* then re-enable it now as the task is running on its
		* preferred node and memory should migrate locally
		*/
		if (!p->numa_migrate_seq)
		p->numa_migrate_seq++;
		return;
		}

		/* This task has no NUMA fault statistics yet */
		if (unlikely(p->numa_preferred_nid == -1))