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From: Hugh Dickins <hugh@veritas.com>
To: Andi Kleen <andi@firstfloor.org>
Cc: Christoph Lameter <clameter@sgi.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Ingo Molnar <mingo@elte.hu>,
	KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	LKML <linux-kernel@vger.kernel.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Bart Van Assche <bart.vanassche@gmail.com>,
	Jeremy Fitzhardinge <jeremy@goop.org>
Subject: Re: quicklists confuse meminfo
Date: Mon, 10 Mar 2008 17:19:32 +0000 (GMT)	[thread overview]
Message-ID: <Pine.LNX.4.64.0803101707070.3398@blonde.site> (raw)
In-Reply-To: <87myp68r88.fsf@basil.nowhere.org>

On Mon, 10 Mar 2008, Andi Kleen wrote:
> Christoph Lameter <clameter@sgi.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.

If the quicklists are going, it'd be good for PAE to go back to a
kmem_cache of 32-byte entries as in 2.6.21 - I think Ingo's patch is
still using a whole page there.

Or have sl?b alignment changes, or virtualization issues (locking
per underlying struct page?), made a kmem_cache awkward there now?

Hugh

  reply	other threads:[~2008-03-10 17:21 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-03-09 10:19 Thomas Gleixner
2008-03-09 10:26 ` Bart Van Assche
2008-03-09 10:29 ` Andi Kleen
2008-03-09 10:42 ` KOSAKI Motohiro
2008-03-09 12:00   ` Thomas Gleixner
2008-03-09 11:14 ` Ingo Molnar
2008-03-09 11:56   ` Thomas Gleixner
2008-03-09 12:01     ` Ingo Molnar
2008-03-09 12:49       ` Andi Kleen
2008-03-10 15:51         ` Christoph Lameter
2008-03-09 12:03   ` Johannes Weiner
2008-03-09 12:03   ` KOSAKI Motohiro
2008-03-09 12:09     ` Ingo Molnar
2008-03-09 12:34       ` Ingo Molnar
2008-03-09 12:51         ` KOSAKI Motohiro
2008-03-09 13:20         ` Thomas Gleixner
2008-03-09 18:46         ` Andrew Morton
2008-03-09 20:21           ` Andi Kleen
2008-03-10 15:54           ` Christoph Lameter
2008-03-10 16:43             ` Andi Kleen
2008-03-10 17:19               ` Hugh Dickins [this message]
2008-03-10 17:25                 ` Andi Kleen
2008-03-10 17:31                 ` Jeremy Fitzhardinge
2008-03-10 17:53                   ` Andi Kleen
2008-03-10 18:35                     ` Jeremy Fitzhardinge
2008-03-10 19:06                       ` Andi Kleen
2008-03-10 20:54                       ` H. Peter Anvin
2008-03-10 21:26                         ` Jeremy Fitzhardinge
2008-03-11  4:07             ` Nick Piggin
2008-03-21 12:52               ` Bart Van Assche
2008-03-21 14:45                 ` Ingo Molnar
2008-03-26  7:45                   ` Bart Van Assche
2008-03-26  7:53                     ` Andrew Morton
2008-03-26  8:13                     ` Ingo Molnar
2008-03-26 10:37                       ` Bart Van Assche
2008-03-26 16:34                         ` Christoph Lameter
2008-03-27  9:48                           ` Bart Van Assche
2008-03-09 19:11         ` Arjan van de Ven
2008-03-09 19:25           ` Ingo Molnar
2008-03-09 19:27             ` Ingo Molnar
2008-03-09 19:31               ` Ingo Molnar
2008-03-10 15:57               ` Christoph Lameter
2008-03-10 15:55             ` Christoph Lameter
2008-03-09 12:47       ` KOSAKI Motohiro

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