Re: quicklists confuse meminfo

[Ingo Molnar <mingo@elte.hu>]

* Arjan van de Ven <arjan@infradead.org> wrote:

> > > ouch! Could you try the patch below? How large is the quicklist 
> > > cache with this applied?
> > 
> > hm, Thomas pointed it out that this wont solve all the problems as 
> > quicklists have a built-in "preserve me" throttle (which is rather 
> > stupid).
> > 
> > the right solution is to get rid of quicklists altogether (Thomas 
> > expects to have patches for that later today).
> 
> careful with this; the quicklists aren't JUST for speed they are also 
> there to make sure a page we free that is a pagetable, is not reused 
> until we have finished flushing the tlbs on all the cpus that saw it. 
> This is a really hard correctness requirement, and while I can see 
> that quicklists are probably not the best way to achieve this, we 
> can't just throw away the behavior ;(

no, that's not true anymore - and the current quicklists code doesnt do 
anything like that AFAICS. It used to be a lot more complex, but now 
it's just a thin wrapper around the page allocator.

	Ingo