On Wednesday 27 September 2006 23:38, Linus Torvalds wrote:
>
> On Wed, 27 Sep 2006, Andi Kleen wrote:
> >
> > It doesn't matter much because these days this stuff is all out of lined
> > anyways and in a single function. And the dynamic branch predictor
> > in all modern CPUs will usually cache the decision (unlocked) there.
>
> Ahh, good point. Once there's only one copy, the branch predictor will get
> it right (and the code size won't much matter)
As a postscript I (unintentionally) bended the truth on that one actually
yesterday. Sorry for that. Semaphores are still inline, unlike spinlocks.
However if the spinlocks are out of line I see no reason to keep semaphores
inline either, so perhaps it would be better to just move them. Then my
argument above would actually work :)
For some reason the unwinder also still seems to get stuck on it :/
-Andi
-
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/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
