Re: [PATCH -mm 1/2] irq_work, Use llist in irq_work

[Huang Ying]

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.

Best Regards,
Huang Ying
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