On Tue, Oct 01, 2013 at 06:47:10PM +0200, Frederic Weisbecker wrote: > Yeah thinking more about it, the preempt disable was probably not > necessary. Now that's trading 2 atomics + 1 Lock/Unlock with 2 Lock/Unlock.
It trades the current 2 atomics for 2 LOCK/UNLOCK. And on x86_64 that's 2 atomics. So all we get is some extra branches; which we must hope for don't actually mess things up too bad. Ohh.. wait a sec.. we also call local_clock() which includes another atomic :/ Bugger.. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
