Commit-ID: f0b8a4afd6a8c500161e45065a91738b490bf5ae
Gitweb: http://git.kernel.org/tip/f0b8a4afd6a8c500161e45065a91738b490bf5ae
Author: Rik van Riel <riel@xxxxxxxxxx>
AuthorDate: Mon, 23 Jun 2014 11:41:29 -0400
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Sat, 5 Jul 2014 11:17:33 +0200
sched/numa: Use group's max nid as task's preferred nid
>From task_numa_placement, always try to consolidate the tasks
in a group on the group's top nid.
In case this task is part of a group that is interleaved over
multiple nodes, task_numa_migrate will set the task's preferred
nid to the best node it could find for the task, so this patch
will cause at most one run through task_numa_migrate.
Signed-off-by: Rik van Riel <riel@xxxxxxxxxx>
Cc: mgorman@xxxxxxx
Cc: chegu_vinod@xxxxxx
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1403538095-31256-2-git-send-email-riel@xxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
kernel/sched/fair.c | 17 +----------------
1 file changed, 1 insertion(+), 16 deletions(-)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index e3ff3d1..96b2d39 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1594,23 +1594,8 @@ static void task_numa_placement(struct task_struct *p)
if (p->numa_group) {
update_numa_active_node_mask(p->numa_group);
- /*
- * If the preferred task and group nids are different,
- * iterate over the nodes again to find the best place.
- */
- if (max_nid != max_group_nid) {
- unsigned long weight, max_weight = 0;
-
- for_each_online_node(nid) {
- weight = task_weight(p, nid) + group_weight(p, nid);
- if (weight > max_weight) {
- max_weight = weight;
- max_nid = nid;
- }
- }
- }
-
spin_unlock_irq(group_lock);
+ max_nid = max_group_nid;
}
if (max_faults) {
--
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