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SubjectRe: quicklists confuse meminfo

* 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


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