LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Christoph Lameter <clameter@sgi.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: 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>
Subject: Re: quicklists confuse meminfo
Date: Mon, 10 Mar 2008 08:54:48 -0700 (PDT)	[thread overview]
Message-ID: <Pine.LNX.4.64.0803100851560.23575@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <20080309114640.85c9c3eb.akpm@linux-foundation.org>

On Sun, 9 Mar 2008, Andrew Morton wrote:

> - They are pretty marginal from a performance POV (iirc)

Pretty significant in our experience.

>   Making __GFP_ZERO smarter/more efficient would be a preferable way of
>   addressing any performance problems we have in there.

Looking at the page allocator "fastpath": The basic reaons that this was 
such a good optimization was that the page allocator is expensive to call. 
The hotpath gets more and more clogged with logic. Fixing the page 
allocator to be more efficient may be the right approach here. That could 
also include having a list of zeroed pages.

Zeroed pages however will not address the issue of having initialized pgd 
(which seems to be what i386 needs).


  parent reply	other threads:[~2008-03-10 15:55 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-03-09 10:19 quicklists confuse meminfo 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 [this message]
2008-03-10 16:43             ` Andi Kleen
2008-03-10 17:19               ` Hugh Dickins
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

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=Pine.LNX.4.64.0803100851560.23575@schroedinger.engr.sgi.com \
    --to=clameter@sgi.com \
    --cc=akpm@linux-foundation.org \
    --cc=bart.vanassche@gmail.com \
    --cc=kosaki.motohiro@jp.fujitsu.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mingo@elte.hu \
    --cc=tglx@linutronix.de \
    --cc=torvalds@linux-foundation.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).