On Mon, 13 Mar 2000, Ingo Molnar wrote:
>of course there is some overhead here, but it's not at all as slow as you
>imagine. It's these two additional (nonlocked) instructions on x86:
>
> decl %0
> jz 1f
>.section offline.preempt
> call do_reschedule
So you if you do:
sys_xxx {
spin_lock()
spin_unlock()
}
then the spin_unlock for sure jumps always far away out of line and you'll
see that change in the bench numbers.
Andrea
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