| From | Andi Kleen <> | Subject | Re: [PATCH 22/25] Generic dynamic per cpu refcounting | Date | Thu, 29 Nov 2012 10:45:04 -0800 |
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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? In this case I would rather use RCU. It's clearly unusable for anything blocking (or not get_cpu) Normally RCU already handles the "ref count for short non blocking case"
Is that really true for AIO? It seems dubious.
-Andi
-- ak@linux.intel.com -- Speaking for myself only
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