Re: [PATCH] cpuacct: VIRT_CPU_ACCOUNTING don't prevent percpu cputime count

[KOSAKI Motohiro]

> On Tue, Apr 28, 2009 at 04:38:51PM +0900, KOSAKI Motohiro wrote:
> > > On Tue, Apr 28, 2009 at 03:53:32PM +0900, KOSAKI Motohiro wrote:
> > 
> > > BTW, did you observe any real problem with the percpu counter spinlock ?
> > 
> > No.
> > I review percpu_counter() caller recently and it seems stragen usage.
> > 
> 
> I should have phrased the question better ...
> 
> So have you found any performance degradation with any benchmarks/workloads
> on archs which define VIRT_CPU_ACCOUNTING due to percpu_counter spinlock
> being taken on every tick ? If the answer is no, don't you think we could
> wait before making the kind of change you are proposing ?

maybe, I don't understand your point.
I don't oppose you wait something :)



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