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

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Date:	Mon, 29 Jun 2015 17:14:02 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	Nicholas Mc Guire <der.herr@...r.at>, oleg@...hat.com,
	paulmck@...ux.vnet.ibm.com, mingo@...hat.com,
	linux-kernel@...r.kernel.org, dave@...olabs.net, riel@...hat.com,
	viro@...IV.linux.org.uk, torvalds@...ux-foundation.org
Subject: Re: [RFC][PATCH 05/13] percpu-rwsem: Optimize readers and reduce
 global impact

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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