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

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Message-ID: <57068F28.8010409@linutronix.de>
Date:	Thu, 7 Apr 2016 18:47:36 +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 04/02/2016 05:12 AM, Mike Galbraith wrote:
>> By the time I improved hotplug I played with this. I had a few ideas but
>> it didn't fly in the end. Today however I ended up with this:
> 
> Yeah, but that fails the duct tape test too.  Mine is below, and is the
> extra sticky variety ;-)  With busted 0299 patch reverted and those two
> applied, my DL980 took a beating for ~36 hours before I aborted it.. ie
> hotplug road seemingly has no more -rt specific potholes.

just to be clear: The patch I attached did _not_ work for you.

> If that lock dies, we can unpin when entering lock slow path and pin
> again post acquisition with no ABBA worries as well, and not only does
> existing hotplug work heaping truckloads better, -rt can perhaps help
> spot trouble as the rewrite proceeds.
> 
> Current state is more broken than ever.. if that's possible.

And the two patches you attached here did?

> 
> 	-Mike

Sebastian