Re: [PATCH -v8][RFC] mutex: implement adaptive spinning

Linus Torvalds
2009-01-12T16:20:34Z

On Mon, 12 Jan 2009, Linus Torvalds wrote:
>
> You made it back into the locked version.

Btw, even if you probably had some reason for this, one thing to note is
that I think Chris' performance testing showed that the version using a
lock was inferior to his local btrfs hack, while the unlocked version
actually beat his hack.

Maybe I misunderstood his numbers, though. But if I followed that sub-part
of the test right, it really means that the locked version is pointless -
it will never be able to replace peoples local hacks for this same thing,
because it just doesn't give the performance people are looking for.

Since the whole (and _only_) point of this thing is to perform well,
that's a big deal.

Linus