linux-kernel - Re: sched_setscheduler() vs idle

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Message-ID: <20150601081924.GR19282@twins.programming.kicks-ass.net>
Date:	Mon, 1 Jun 2015 10:19:24 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Mike Galbraith <umgwanakikbuti@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	ktkhai@...allels.com
Subject: Re: sched_setscheduler() vs idle_balance() race

On Sat, May 30, 2015 at 03:08:26PM +0200, Mike Galbraith wrote:

> Seems trying to make the target invisible to balancing created a new
> race: dequeue target, do stuff that may drop rq->lock while it's
> dequeued, target sneaks into schedule(), dequeues itself (#2), boom.

Aw god yes, duh.

Fun little puzzle this. Lemme go think a bit.
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