Re: [PATCH 4/4]percpu_counter: use atomic64 for counter

From: Tejun Heo
Date: Tue Apr 12 2011 - 15:15:44 EST


On Tue, Apr 12, 2011 at 04:04:06PM +0800, Shaohua Li wrote:
> should tunning the batch count, but if we can make percpu_counter better, why
> not?

First of all, the lock being only in slow paths, it's quite unlikely
to get ever contended. Also, because the lock duration is always
extremely short, conversion to atomic_t isn't too likely to gain
anything significant, especially in cold paths.

That said, if it's all gains, why not? I don't know. Maybe. Given
problems in the previous patches, I don't feel too enthusiastic for
this series at this point but I'm quite sleep deprived now so it might
just be me not the patch itself.


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