linux-kernel - Re: [rfc patch 2/2] rt/locking/hotplug: Fix rt_spin_lock_slowlock() migrate

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Message-ID: <57068F78.2070607@linutronix.de>
Date:	Thu, 7 Apr 2016 18:48:56 +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: [rfc patch 2/2] rt/locking/hotplug: Fix rt_spin_lock_slowlock()
 migrate_disable() bug

On 04/07/2016 06:37 AM, Mike Galbraith wrote:
> On Wed, 2016-04-06 at 14:00 +0200, Mike Galbraith wrote:
>> It'll take a hotplug beating seemingly as well as any non-rt kernel,
>> but big box NAKed it due to jitter, which can mean 1.0 things.. duh.
> 
> FWIW, the below turned big box NAK into ACK.  Stressing hotplug over
> night, iteration completion time went from about 2 1/2 hours with
> bandaids on the two identified rt sore spots, to an hour and 10 minutes
> as well for some reason, but whatever..

Just to be clear. I need #1, #2 from this thread and this below to make
it work?

> 	-Mike
> 

Sebastian