linux-kernel - Re: [RFC][PATCH 0/7] locking: qspinlock

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Date:	Wed, 12 Mar 2014 17:23:28 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Dave Chinner <david@...morbit.com>,
	Waiman Long <waiman.long@...com>, arnd@...db.de,
	linux-arch@...r.kernel.org, x86@...nel.org,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	walken@...gle.com, andi@...stfloor.org, riel@...hat.com,
	paulmck@...ux.vnet.ibm.com, torvalds@...ux-foundation.org,
	oleg@...hat.com
Subject: Re: [RFC][PATCH 0/7] locking: qspinlock

On Wed, Mar 12, 2014 at 12:19:33PM -0400, Steven Rostedt wrote:
> On Wed, 12 Mar 2014 16:57:54 +0100
> Peter Zijlstra <peterz@...radead.org> wrote:
> 
> 
> > I build and booted these patches against tip/master as of this morning.
> > It build ~50 defconfig kernels on my WSM-EP.
> > 
> > I've not managed to reproduce the hang as reported by Dave, but then I
> > doubt building kernels has anywhere near the lock contention he
> > generated.
> > 
> 
> Have you tried hackbench? That usually gives rq spinlocks a bit of
> contention.

Ha!, bang it goes. I suppose my userspace contention is too nice or
something for not triggering this.

Lemme try and put it together again :-)
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