Re: [PATCH 22/25] Generic dynamic per cpu refcounting

[Andi Kleen]

On Thu, Nov 29, 2012 at 10:57:20AM -0800, Kent Overstreet wrote:
> On Thu, Nov 29, 2012 at 10:45:04AM -0800, Andi Kleen wrote:
> > Kent Overstreet <koverstreet@xxxxxxxxxx> writes:
> > 
> > > This implements a refcount with similar semantics to
> > > atomic_get()/atomic_dec_and_test(), that starts out as just an atomic_t
> > > but dynamically switches to per cpu refcounting when the rate of
> > > gets/puts becomes too high.
> > 
> > This will only work if you put on the same CPU as you get, right?
> 
> Nope, no such restriction.

I don't see how you ensure you're doing the __this_cpu_dec on the same
CPU as you did the get

-Andi
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