Re: [PATCH] cache colour task_structs

[Andi Kleen <ak@suse.de>]

Alan Cox <alan@lxorguk.ukuu.org.uk> writes:
> 
> We need to perturb esp colour too. It might be the right way to do this
> is slab based kernel stacks, it might be that your code is cheaper than
> the cost of getting current the really hard way and we should just add
> random numbers to the initial esp of a task ?

You could do that even today (without slab task_struct) by using a 
random/coloured at fork time value for esp0.  This could just be a static
colour counter that is subtracted.

Just don't forget to teach ptrace and proc WCHAN and oops printing about it; 
they currently use hardcoded stack offsets. It'll also likely break kdb.

-Andi