Re: AIM7 40% regression with 2.6.26-rc1

[Linus Torvalds]

On Wed, 7 May 2008, Andrew Morton wrote:

> On Wed, 7 May 2008 10:08:18 -0700 (PDT) Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
> 
> > Which is why I'm 100% convinced it's not even worth saving the old code. 
> > It needs to use mutexes, or spinlocks. I bet it has *nothing* to do with 
> > "slow path" other than the fact that it gets to that slow path much more 
> > these days.
> 
> Stupid question: why doesn't lock_kernel() use a mutex?

Not stupid.

The only reason some code didn't get turned over to mutexes was literally 
that they didn't want the debugging because they were doing intentionally 
bad things. 

I think the BKL is one of them (the console semaphore was another, iirc). 

			Linus
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