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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20150629151402.GJ19282@twins.programming.kicks-ass.net>
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.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/