Re: [RFC][PATCH 05/13] percpu-rwsem: Optimize readers and reduce global impact

From	Peter Zijlstra <peterz@infradead.org>
Newsgroups	linux.kernel
Subject	Re: [RFC][PATCH 05/13] percpu-rwsem: Optimize readers and reduce global impact
Date	2015-06-29 17:20 +0200
Message-ID	<pGJ0L-6L7-29@gated-at.bofh.it> (permalink)
References	(2 earlier) <pEqOC-4be-21@gated-at.bofh.it> <pFkH7-Ob-1@gated-at.bofh.it> <pFkQN-Zx-17@gated-at.bofh.it> <pGDHI-7uP-13@gated-at.bofh.it> <pGJ0K-6L7-1@gated-at.bofh.it>
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On Mon, Jun 29, 2015 at 11:12:20AM -0400, Tejun Heo wrote:
> Hello, Peter.
> 
> On Mon, Jun 29, 2015 at 11:32:19AM +0200, Peter Zijlstra wrote:
> > Agreed, luckily we already have the infrastructure for this, something
> > like so?
> > 
> > --- a/include/linux/percpu-defs.h
> > +++ b/include/linux/percpu-defs.h
> > @@ -287,6 +287,16 @@ do {									\
> >  	preempt_enable();						\
> >  } while (0)
> >  
> > +#define per_cpu_sum(var)						\
> > +({									\
> > +	typeof(var) __sum = 0;						\
> > +	int cpu;							\
> 
> Why not __cpu?

I've no idea, __cpu is indeed more consistent, consider it changed.
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Re: [RFC][PATCH 05/13] percpu-rwsem: Optimize readers and reduce  global impact Tejun Heo <tj@kernel.org> - 2015-06-29 17:20 +0200
  Re: [RFC][PATCH 05/13] percpu-rwsem: Optimize readers and reduce  global impact Peter Zijlstra <peterz@infradead.org> - 2015-06-29 17:20 +0200

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