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authorRik van Riel <riel@redhat.com>2014-06-04 16:33:15 -0400
committerIngo Molnar <mingo@kernel.org>2014-06-18 18:29:58 +0200
commitbb97fc31647539f1f102eed646a95e200160a150 (patch)
tree69a009dd0824b95572aab9c622357c032ea3c1cc /kernel/sched
parenta43455a1d572daf7b730fe12eb747d1e17411365 (diff)
downloadlinux-bb97fc31647539f1f102eed646a95e200160a150.tar.bz2
sched/numa: Always try to migrate to preferred node at task_numa_placement() time
It is possible that at task_numa_placement() time, the task's numa_preferred_nid does not change, but the task is not actually running on the preferred node at the time. In that case, we still want to attempt migration to the preferred node. Signed-off-by: Rik van Riel <riel@redhat.com> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Cc: mgorman@suse.de Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: http://lkml.kernel.org/r/20140604163315.1dbc7b56@cuia.bos.redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched')
-rw-r--r--kernel/sched/fair.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 8fbb0116bb5a..3fa3e1839c86 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1613,11 +1613,13 @@ static void task_numa_placement(struct task_struct *p)
spin_unlock_irq(group_lock);
}
- /* Preferred node as the node with the most faults */
- if (max_faults && max_nid != p->numa_preferred_nid) {
- /* Update the preferred nid and migrate task if possible */
- sched_setnuma(p, max_nid);
- numa_migrate_preferred(p);
+ if (max_faults) {
+ /* Set the new preferred node */
+ if (max_nid != p->numa_preferred_nid)
+ sched_setnuma(p, max_nid);
+
+ if (task_node(p) != p->numa_preferred_nid)
+ numa_migrate_preferred(p);
}
}