Date: Fri, 31 Jan 2014 21:08:25 +0100
From: Peter Zijlstra <peterz@infradead.org>
To: Jason Low <jason.low2@hp.com>
Cc: Ingo Molnar <mingo@redhat.com>, Paul McKenney <paulmck@linux.vnet.ibm.com>,
        Waiman Long <Waiman.Long@hp.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Rik van Riel <riel@redhat.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Davidlohr Bueso <davidlohr@hp.com>, "H. Peter Anvin" <hpa@zytor.com>,
        Andi Kleen <andi@firstfloor.org>,
        "Chandramouleeswaran, Aswin" <aswin@hp.com>,
        "Norton, Scott J" <scott.norton@hp.com>, chegu_vinod@hp.com
Subject: Re: [RFC][PATCH v2 5/5] mutex: Give spinners a chance to
 spin_on_owner if need_resched() triggered while queued
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On Fri, Jan 31, 2014 at 12:01:37PM -0800, Jason Low wrote:
> On Fri, Jan 31, 2014 at 6:09 AM, Peter Zijlstra <peterz@infradead.org> wrote:
> 
> > I've downloaded AIM7 from sf.net and I hope I'm running it with 100+
> > loads but I'm not entirely sure I got this thing right, its not really
> > making progress with or without patch :/
> 
> Ingo's program http://lkml.org/lkml/2006/1/8/50 using the V option may
> be able to generate similar mutex contention.
> 
> Currently still getting soft lockups with the updated version.

Bugger.. ok clearly I need to think harder still. I'm fairly sure this
cancelation can work though, just seems tricky to get right :-)

I'll give that proglet from Ingo a go, although that might be Monday ere
I get to it.
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