On Sun, 31 May 2009 07:38:26 -0700
Arjan van de Ven <arjan@infradead.org> wrote:

> > 
> > 
> > Really, get a life, go fix real bugs. Don't make our kernel slower 
> 
> the "make it slower" is an assumption on your part.
> I'm not convinced. Would like to see data!
> 


btw if the performance difference is basically a wash (as I'm
suspecting), then we SHOULD do zero-on-free, just out of general
principles. 

Ingo mentioned the kernel stack, and that's a good point, we ought
to have a way to zero the rest of the stack inside the kernel, at
which point you could do things like providing a command line option
(or sysctl?) to call that from the munmap codepath or so...
(after all there you do a tlb flush and other expensive things as well)