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

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Message-ID: <20140312155754.GG27965@twins.programming.kicks-ass.net>
Date:	Wed, 12 Mar 2014 16:57:54 +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 06:07:30AM -0400, Steven Rostedt wrote:
> On Wed, 12 Mar 2014 15:26:16 +1100
> Dave Chinner <david@...morbit.com> wrote:
> 
> 
> > I did apply them manually - but the patchset is based on the
> > tip/master, plus some patches from a previous patch set that aren't
> > in tip/locking to be able to apply this patchset cleanly in the
> > first place. So there's no "start froma known working kernel" case
> > that applies here :/
> 
> Peter,
> 
> Which kernel should we start testing your code against?

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.

I did run my userspace on both the WSM-EP as well as the Interlagos box,
topping out at 24 and 32 contending cpus resp.

No weird lockups :/
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