On Fri, Apr 08, 2005 at 07:33:58AM +0400, Evgeniy Polyakov wrote:
> On Fri, 2005-04-08 at 12:59 +1000, Herbert Xu wrote:
> > Evgeniy Polyakov <[email protected]> wrote:
> > >
> > > atomic_dec_and_test() is more expensive than 2 barriers + atomic_dec(),
> > > but in case of connector I think the price is not so high.
> >
> > Can you list the platforms on which this is true?
>
> sparc64, some mips [at least in UP].
Are you sure? The implementations of atomic_sub and atomic_sub_return
(which correspond to atomic_dec and atomic_dec_and_test) seem to be
comparable in cost on those two architectures.
Perhaps Dave can clarify for us about sparc64?
Cheers,
--
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Email: Herbert Xu ~{PmV>HI~} <[email protected]>
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