linux-kernel - Re: quicklists confuse meminfo

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Date:	Sun, 9 Mar 2008 20:25:14 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <clameter@....com>,
	Bart Van Assche <bart.vanassche@...il.com>
Subject: Re: quicklists confuse meminfo


* Arjan van de Ven <arjan@...radead.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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