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

[Andi Kleen]

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?
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@xxxxxxxxxxxxxxx -- Speaking for myself only
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