linux-kernel - Re: [PATCH RT 4/6] rt/locking: Reenable migration accross schedule

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Message-ID: <5715D919.2030500@linutronix.de>
Date:	Tue, 19 Apr 2016 09:07:05 +0200
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Mike Galbraith <umgwanakikbuti@...il.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org,
	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH RT 4/6] rt/locking: Reenable migration accross schedule

On 04/18/2016 07:55 PM, Mike Galbraith wrote:
> 
> I'll have to feed it to DL980, hotplug and jitter test it.  It seemed
> to think that pinning post acquisition was a bad idea jitter wise, but
> I was bending things up while juggling multiple boxen, so..

pinning pre acquisition could get you in a situation where you get the
lock and you are stuck on CPU A where is also a task running right now
with a higher priority while CPU B and CPU C are idle.

> 
> 	-Mike
> 
Sebastian