From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Christoph Lameter <clameter@sgi.com>,
linux-mm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [QUICKLIST 0/4] Arch independent quicklists V2
Date: Tue, 13 Mar 2007 19:03:38 +1100 [thread overview]
Message-ID: <45F65ADA.9010501@yahoo.com.au> (raw)
In-Reply-To: <20070313005334.853559ca.akpm@linux-foundation.org>
Andrew Morton wrote:
>>On Tue, 13 Mar 2007 00:13:25 -0700 (PDT) Christoph Lameter <clameter@sgi.com> wrote:
>>Page table pages have the characteristics that they are typically zero
>>or in a known state when they are freed.
>
>
> Well if they're zero then perhaps they should be released to the page allocator
> to satisfy the next __GFP_ZERO request. If that request is for a pagetable
> page, we break even (except we get to remove special-case code). If that
> __GFP_ZERO allocation was or some application other than for a pagetable, we
> win.
>
> iow, can we just nuke 'em?
Page allocator still requires interrupts to be disabled, which this doesn't.
Considering there isn't much else that frees known zeroed pages, I wonder if
it is worthwhile.
Last time the zeroidle discussion came up was IIRC not actually real performance
gain, just cooking the 1024 CPU threaded pagefault numbers ;)
--
SUSE Labs, Novell Inc.
Send instant messages to your online friends http://au.messenger.yahoo.com
next prev parent reply other threads:[~2007-03-13 8:03 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-13 7:13 [QUICKLIST 0/4] Arch independent quicklists V2 Christoph Lameter
2007-03-13 7:13 ` [QUICKLIST 1/4] Generic quicklist implementation Christoph Lameter
2007-03-13 9:05 ` Paul Mundt
2007-03-15 20:51 ` Christoph Lameter
2007-03-13 7:13 ` [QUICKLIST 2/4] Quicklist support for i386 Christoph Lameter
2007-03-13 7:13 ` [QUICKLIST 3/4] Quicklist support for x86_64 Christoph Lameter
2007-03-13 7:13 ` [QUICKLIST 4/4] Quicklist support for sparc64 Christoph Lameter
2007-03-13 8:53 ` [QUICKLIST 0/4] Arch independent quicklists V2 Andrew Morton
2007-03-13 8:03 ` Nick Piggin [this message]
2007-03-13 11:52 ` Andrew Morton
2007-03-13 11:06 ` Nick Piggin
2007-03-13 11:06 ` Nick Piggin
2007-03-13 12:15 ` Andrew Morton
2007-03-13 12:15 ` Andrew Morton
2007-03-13 11:20 ` Christoph Lameter
2007-03-13 11:20 ` Christoph Lameter
2007-03-13 12:30 ` Andrew Morton
2007-03-13 12:30 ` Andrew Morton
2007-03-15 20:23 ` Christoph Lameter
2007-03-15 20:23 ` Christoph Lameter
2007-03-13 11:30 ` Nick Piggin
2007-03-13 11:30 ` Nick Piggin
2007-03-13 12:47 ` Andrew Morton
2007-03-13 12:47 ` Andrew Morton
2007-03-13 12:01 ` Nick Piggin
2007-03-13 12:01 ` Nick Piggin
2007-03-13 13:11 ` Andrew Morton
2007-03-13 13:11 ` Andrew Morton
2007-03-13 12:18 ` Nick Piggin
2007-03-13 12:18 ` Nick Piggin
2007-03-13 17:30 ` Jeremy Fitzhardinge
2007-03-13 17:30 ` Jeremy Fitzhardinge
2007-03-13 20:03 ` Matt Mackall
2007-03-13 20:03 ` Matt Mackall
2007-03-13 20:17 ` Jeremy Fitzhardinge
2007-03-13 20:17 ` Jeremy Fitzhardinge
2007-03-13 20:21 ` Matt Mackall
2007-03-13 20:21 ` Matt Mackall
2007-03-13 21:07 ` David Miller
2007-03-13 21:07 ` David Miller, Matt Mackall
2007-03-13 21:14 ` Matt Mackall
2007-03-13 21:14 ` Matt Mackall
2007-03-13 21:36 ` Jeremy Fitzhardinge
2007-03-13 21:36 ` Jeremy Fitzhardinge
2007-03-13 21:46 ` Peter Chubb
2007-03-13 21:46 ` Peter Chubb
2007-03-13 21:48 ` David Miller
2007-03-13 21:48 ` David Miller, Matt Mackall
2007-03-14 1:12 ` William Lee Irwin III
2007-03-14 1:12 ` William Lee Irwin III
2007-03-15 23:12 ` William Lee Irwin III
2007-03-15 23:12 ` William Lee Irwin III
2007-03-13 23:58 ` Paul Mackerras
2007-03-13 11:17 ` Christoph Lameter
2007-03-13 12:27 ` Andrew Morton
2007-03-15 20:28 ` Christoph Lameter
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