linux-kernel - [tip:sched/core] sched/numa: Simplify task_numa

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Message-ID: <tip-1c5d3eb3759013bc7ee4197aa0a9f245bdb6eb90@git.kernel.org>
Date:	Sat, 5 Jul 2014 03:45:05 -0700
From:	tip-bot for Rik van Riel <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, riel@...hat.com, hpa@...or.com,
	mingo@...nel.org, torvalds@...ux-foundation.org,
	peterz@...radead.org, tglx@...utronix.de
Subject: [tip:sched/core] sched/numa: Simplify task_numa_compare()

Commit-ID:  1c5d3eb3759013bc7ee4197aa0a9f245bdb6eb90
Gitweb:     http://git.kernel.org/tip/1c5d3eb3759013bc7ee4197aa0a9f245bdb6eb90
Author:     Rik van Riel <riel@...hat.com>
AuthorDate: Mon, 23 Jun 2014 11:46:15 -0400
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Sat, 5 Jul 2014 11:17:37 +0200

sched/numa: Simplify task_numa_compare()

When a task is part of a numa_group, the comparison should always use
the group weight, in order to make workloads converge.

Signed-off-by: Rik van Riel <riel@...hat.com>
Cc: chegu_vinod@...com
Cc: mgorman@...e.de
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/1403538378-31571-4-git-send-email-riel@redhat.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/fair.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index d6526d2..cebb312 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1154,7 +1154,7 @@ static void task_numa_compare(struct task_numa_env *env,
 	struct task_group *tg;
 	long src_load, dst_load;
 	long load;
-	long imp = (groupimp > 0) ? groupimp : taskimp;
+	long imp = env->p->numa_group ? groupimp : taskimp;
 
 	rcu_read_lock();
 	cur = ACCESS_ONCE(dst_rq->curr);
@@ -1192,11 +1192,6 @@ static void task_numa_compare(struct task_numa_env *env,
 			 * itself (not part of a group), use the task weight
 			 * instead.
 			 */
-			if (env->p->numa_group)
-				imp = groupimp;
-			else
-				imp = taskimp;
-
 			if (cur->numa_group)
 				imp += group_weight(cur, env->src_nid) -
 				       group_weight(cur, env->dst_nid);
--
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