Re: [RFC][PATCH 0/7] locking: qspinlock

[Peter Zijlstra]

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@xxxxxxxxxxxxx> 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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