linux-kernel - [tip:sched/core] sched/numa: Consider 'imbalance_pct' when comparing loads in numa_has

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Date:	Mon, 6 Jul 2015 08:50:47 -0700
From:	tip-bot for Srikar Dronamraju <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	riel@...hat.com, tglx@...utronix.de, srikar@...ux.vnet.ibm.com,
	mingo@...nel.org, hpa@...or.com, torvalds@...ux-foundation.org,
	peterz@...radead.org, linux-kernel@...r.kernel.org, mgorman@...e.de
Subject: [tip:sched/core] sched/numa: Consider 'imbalance_pct'
  when comparing loads in numa_has_capacity()

Commit-ID:  2d9f7144b84aac8be63e1c45cd248a5f7f67ed24
Gitweb:     http://git.kernel.org/tip/2d9f7144b84aac8be63e1c45cd248a5f7f67ed24
Author:     Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
AuthorDate: Tue, 16 Jun 2015 17:26:00 +0530
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Mon, 6 Jul 2015 15:29:55 +0200

sched/numa: Consider 'imbalance_pct' when comparing loads in numa_has_capacity()

This is consistent with all other load balancing instances where we
absorb unfairness upto env->imbalance_pct. Absorbing unfairness upto
env->imbalance_pct allows to pull and retain task to their preferred
nodes.

Signed-off-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Acked-by: Rik van Riel <riel@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Mel Gorman <mgorman@...e.de>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/1434455762-30857-3-git-send-email-srikar@linux.vnet.ibm.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/fair.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 43ee84f..a53a610 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1415,8 +1415,9 @@ static bool numa_has_capacity(struct task_numa_env *env)
 	 * --------------------- vs ---------------------
 	 * src->compute_capacity    dst->compute_capacity
 	 */
-	if (src->load * dst->compute_capacity >
-	    dst->load * src->compute_capacity)
+	if (src->load * dst->compute_capacity * env->imbalance_pct >
+
+	    dst->load * src->compute_capacity * 100)
 		return true;
 
 	return false;
--
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