Messages in this thread | | | Date | Thu, 29 Nov 2012 19:59:53 +0100 | From | Andi Kleen <> | Subject | Re: [PATCH 22/25] Generic dynamic per cpu refcounting |
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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@google.com> 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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