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From: Marcelo Tosatti <mtosatti@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: Frederic Weisbecker <fweisbec@gmail.com>,
	Chris Friesen <chris.friesen@windriver.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Peter Zijlstra <peterz@infradead.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Jim Somerville <Jim.Somerville@windriver.com>,
	Christoph Lameter <cl@linux.com>,
	Frederic Weisbecker <frederic@kernel.org>,
	Marcelo Tosatti <mtosatti@redhat.com>
Subject: [patch 2/4] isolation: set HK_FLAG_SCHED on nohz_full CPUs
Date: Wed, 01 Apr 2020 09:10:20 -0300	[thread overview]
Message-ID: <20200401121342.930480720@redhat.com> (raw)
In-Reply-To: <20200401121018.104226700@redhat.com>

Avoid idle load balancing on nohz_full CPUs.

This avoids assigning tasks to such CPUs, when they enter idle.

Suggested-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

Index: linux-2.6/kernel/sched/isolation.c
===================================================================
--- linux-2.6.orig/kernel/sched/isolation.c
+++ linux-2.6/kernel/sched/isolation.c
@@ -140,7 +140,8 @@ static int __init housekeeping_nohz_full
 {
 	unsigned int flags;
 
-	flags = HK_FLAG_TICK | HK_FLAG_WQ | HK_FLAG_TIMER | HK_FLAG_RCU | HK_FLAG_MISC;
+	flags = HK_FLAG_TICK | HK_FLAG_WQ | HK_FLAG_TIMER | HK_FLAG_RCU |
+		HK_FLAG_MISC | HK_FLAG_SCHED;
 
 	return housekeeping_setup(str, flags);
 }



  parent reply	other threads:[~2020-04-01 12:15 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-01 12:10 [patch 0/4] affine kernel threads to nohz_full= cpumask (v4) Marcelo Tosatti
2020-04-01 12:10 ` [patch 1/4] kthread: switch to cpu_possible_mask Marcelo Tosatti
2020-04-01 12:10 ` Marcelo Tosatti [this message]
2020-04-01 12:10 ` [patch 3/4] isolcpus: affine kernel threads to housekeeping cpus Marcelo Tosatti
2020-04-01 22:32   ` Randy Dunlap
2020-04-03 10:37   ` [patch 3/4 v2] " Marcelo Tosatti
2020-04-01 12:10 ` [patch 4/4] isolcpus: undeprecate on documentation Marcelo Tosatti
2020-04-20 16:02 ` [patch 0/4] affine kernel threads to nohz_full= cpumask (v4) Frederic Weisbecker

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