On Fri, Apr 08, 2005 at 07:52:34AM +0400, Evgeniy Polyakov wrote: > On Fri, 2005-04-08 at 13:32 +1000, Herbert Xu wrote: > > 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. > > mips has additional sync.
But atomic_dec + 2 barries is going to do the sync as well, no? Cheers, -- Visit Openswan at http://www.openswan.org/ Email: Herbert Xu ~{PmV>HI~} <[EMAIL PROTECTED]> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
