linux-kernel - Re: quicklists confuse meminfo

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Message-ID: <20080310172533.GB7692@one.firstfloor.org>
Date:	Mon, 10 Mar 2008 18:25:33 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Hugh Dickins <hugh@...itas.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Christoph Lameter <clameter@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Bart Van Assche <bart.vanassche@...il.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>
Subject: Re: quicklists confuse meminfo

On Mon, Mar 10, 2008 at 05:19:32PM +0000, Hugh Dickins wrote:
> On Mon, 10 Mar 2008, Andi Kleen wrote:
> > Christoph Lameter <clameter@....com> writes:
> > > 
> > > Zeroed pages however will not address the issue of having initialized pgd 
> > > (which seems to be what i386 needs).
> > 
> > pgd is tiny on i386 PAE (4 * 16 bytes). Are you sure reinitializing that
> > is a serious issue? ...
> 
> It used to be tiny (32 aligned bytes), then 2.6.22's quicklist enlarged
> that to a whole (lowmem) page.  I think we were all too busy with other
> stuff to protest loudly enough about that bloat.

Interesting; I missed.

Hmm, that might have been for Xen or Vmware too (which like some structures
be page aligned) But I agree it is bloat in general.

-Andi
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