Re: [PATCH v4 3/3] qspinlock, x86: Add x86 specific optimization for 2 contending tasks

[Waiman Long]

On 02/21/2014 12:26 PM, Peter Zijlstra wrote:
> On Fri, Feb 21, 2014 at 12:09:57PM -0500, Waiman Long wrote:
> > On 02/21/2014 12:08 PM, Waiman Long wrote:
> > > On 02/21/2014 07:12 AM, Peter Zijlstra wrote:
> > > > Why is this x86 only code?
> > > The code is making use of the fact that byte write is atomic which is true
> > > in x86 and probably in a few other architectures. I could pull these codes
> > > into the generic qspinlock.c file and set a flag in the asm header file to
> > > activate it if it is what you want.
> > >
> > > -Longman
> > BTW, I also assume that 8-bit and 16-bit cmpxchg() and xchg() are available.
> Right, screw Alpha :-) Just pull it into the generic code; its far too
> much code to replicate per arch.

OK, I will do that in the next version.

-Longman
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