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

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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>
This commit is contained in:
Rik van Riel
2013-10-07 11:29:12 +01:00
committed by Ingo Molnar
parent 6b9a7460b6
commit 06ea5e035b
1 changed files with 9 additions and 1 deletions
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10
kernel/sched/fair.c
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@@ -1016,8 +1016,16 @@ static void numa_migrate_preferred(struct task_struct *p)
{ {
/* Success if task is already running on preferred CPU */ /* Success if task is already running on preferred CPU */
p->numa_migrate_retry = 0; 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; return;
}
/* This task has no NUMA fault statistics yet */ /* This task has no NUMA fault statistics yet */
if (unlikely(p->numa_preferred_nid == -1)) if (unlikely(p->numa_preferred_nid == -1))