linux-kernel - [RFC 2/3] sched: set number of iterations to h_nr

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Message-Id: <1483371588-17140-2-git-send-email-urezki@gmail.com>
Date:   Mon,  2 Jan 2017 16:39:47 +0100
From:   Uladzislau Rezki <urezki@...il.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Uladzislau 2 Rezki <uladzislau2.rezki@...ymobile.com>
Subject: [RFC 2/3] sched: set number of iterations to h_nr_running

From: Uladzislau 2 Rezki <uladzislau2.rezki@...ymobile.com>

It is possible that busiest run queue has multiple RT tasks,
whereas no CFS tasks, that is why it is reasonable to use
h_nr_running instead, because a load balance only applies
for CFS related tasks.

Signed-off-by: Uladzislau 2 Rezki <uladzislau2.rezki@...ymobile.com>
---
 kernel/sched/fair.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index c5d9351..9ebcab1 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -7752,7 +7752,7 @@ static int load_balance(int this_cpu, struct rq *this_rq,
 		 * Set loop_max when rq's lock is taken to prevent a race.
 		 */
 		env.loop_max = min(sysctl_sched_nr_migrate,
-						busiest->nr_running);
+						busiest->cfs.h_nr_running);
 
 		/*
 		 * cur_ld_moved - load moved in current iteration
-- 
2.1.4