From: Peter Zijlstra <peterz@infradead.org>
To: Huang Ying <ying.huang@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH -mm 1/2] irq_work, Use llist in irq_work
Date: Fri, 02 Sep 2011 15:26:12 +0200 [thread overview]
Message-ID: <1314969972.1301.15.camel@twins> (raw)
In-Reply-To: <4E602EC8.9010306@intel.com>
On Fri, 2011-09-02 at 09:18 +0800, Huang Ying wrote:
> On 09/01/2011 06:00 PM, Peter Zijlstra wrote:
> > On Thu, 2011-09-01 at 16:44 +0800, Huang Ying wrote:
> >
> >> Because llist is in library, it may be used in highly contended case and
> >> light/un-contended loads. So maybe code as above is best choice for llist.
> >
> > Well the thing is, if you're heavily contended you should probably be
> > doing something else..
>
> So which solution is preferable?
>
> 1) no cpu_relax
> 2) cpu_relax after first cmpxchg
>
> Personally, I prefer 2). It should have acceptable overhead in
> ligh/un-contended loads. Do you agree.
I guess so, we can always poke at it again when someone finds something
to measure.
next prev parent reply other threads:[~2011-09-02 13:26 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-30 5:16 [PATCH -mm 0/2] Use llist in irq_work and xlist Huang Ying
2011-08-30 5:16 ` [PATCH -mm 1/2] irq_work, Use llist in irq_work Huang Ying
2011-08-31 10:10 ` Peter Zijlstra
2011-09-01 1:46 ` Huang Ying
2011-09-01 3:20 ` Huang Ying
2011-09-01 7:58 ` Peter Zijlstra
2011-09-01 8:56 ` Huang Ying
2011-09-01 9:57 ` Peter Zijlstra
2011-09-02 1:14 ` Huang Ying
2011-09-03 17:35 ` Mathieu Desnoyers
2011-09-01 12:51 ` Mathieu Desnoyers
2011-09-01 13:00 ` Mathieu Desnoyers
2011-09-02 1:08 ` Huang Ying
2011-09-03 16:33 ` Mathieu Desnoyers
2011-09-01 7:57 ` Peter Zijlstra
2011-09-01 8:44 ` Huang Ying
2011-09-01 10:00 ` Peter Zijlstra
2011-09-02 1:18 ` Huang Ying
2011-09-02 13:26 ` Peter Zijlstra [this message]
2011-08-30 5:16 ` [PATCH -mm 2/2] net, rds, Replace xlist in net/rds/xlist.h with llist Huang Ying
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