On Fri, Nov 02, 2007 at 08:56:46PM -0400, Chuck Ebbert wrote: > On 11/02/2007 07:01 PM, Nick Piggin wrote: > > > > In the contended multi-threaded tight loop, the xchg lock is slower than inc > > lock but still beats the fair xadd lock, but that's only because it is > > just as unfair if not more so on this hardware (runtime difference of up to > > about 10%) > > > > I meant xchg for unlock, not lock.
That is for unlock. 2x the number of atomic operations ~= 2x the cost. - 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/
