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

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Date:	Fri, 8 Apr 2016 16:51:15 +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 04/08/2016 04:16 PM, Mike Galbraith wrote:
>> okay. and how did you trigger this? Just Steven's script or was there
>> more to it?
> 
> I run stockfish, futextest, hackbench and tbench with it, terminating
> and restarting them at random intervals just to make sure nobody gets
> into a comfortable little rut.  Stockfish and tbench are sized as to
> not saturate the box, hackbench runs periodically (and with no args to
> turn it into a hog), futextest run.sh just does its normal thing.

Is there anything you can hand me over?

> Trying to grab an rtmutex while queued on an rtmutex... doesn't matter
> much if it's the lock that likes to deadlock us, or the one you added
> instead of making that blasted lock really really dead.

Yeah, doesn't look too good.

> 	-Mike
> 
Sebastian