linux-kernel - [tip:sched/core] sched/fair: Delete resched_cpu() from idle

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Message-ID: <tip-10a12983b3d437a6998b3845870e52c1c752c101@git.kernel.org>
Date:	Thu, 2 Oct 2014 22:28:07 -0700
From:	tip-bot for Kirill Tkhai <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, ktkhai@...allels.com, hpa@...or.com,
	mingo@...nel.org, peterz@...radead.org, tglx@...utronix.de,
	juri.lelli@...il.com
Subject: [tip:sched/core] sched/fair: Delete resched_cpu()
  from idle_balance()

Commit-ID:  10a12983b3d437a6998b3845870e52c1c752c101
Gitweb:     http://git.kernel.org/tip/10a12983b3d437a6998b3845870e52c1c752c101
Author:     Kirill Tkhai <ktkhai@...allels.com>
AuthorDate: Wed, 1 Oct 2014 01:04:44 +0400
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Fri, 3 Oct 2014 05:46:56 +0200

sched/fair: Delete resched_cpu() from idle_balance()

We already reschedule env.dst_cpu in attach_tasks()->check_preempt_curr()
if this is necessary.

Furthermore, a higher priority class task may be current on dest rq,
we shouldn't disturb it.

Signed-off-by: Kirill Tkhai <ktkhai@...allels.com>
Cc: Juri Lelli <juri.lelli@...il.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: http://lkml.kernel.org/r/20140930210441.5258.55054.stgit@localhost
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/fair.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index dfdcbfd..bd61cff 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6701,12 +6701,6 @@ more_balance:
 
 		local_irq_restore(flags);
 
-		/*
-		 * some other cpu did the load balance for us.
-		 */
-		if (cur_ld_moved && env.dst_cpu != smp_processor_id())
-			resched_cpu(env.dst_cpu);
-
 		if (env.flags & LBF_NEED_BREAK) {
 			env.flags &= ~LBF_NEED_BREAK;
 			goto more_balance;
--
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