Re: [PATCH 1/5] pid: Implement task references.

[Greg KH]

On Mon, Jan 30, 2006 at 06:19:35AM +0100, Eric Dumazet wrote:
> Example of improvement in kref_put() :
> 
> [PATCH] kref : Avoid an atomic operation in kref_put() when the last 
> reference is dropped. On most platforms, atomic_read() is a plan read of 
> the counter and involves no atomic at all.

No, we wat to decrement and test at the same time, to protect against
any race where someone is incrementing right when we are dropping the
last reference.

So, thanks, but I'm not going to apply this.

greg k-h
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