linux-kernel - Re: [QUICKLIST 0/4] Arch independent quicklists V2

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Message-Id: <20070313005334.853559ca.akpm@linux-foundation.org>
Date:	Tue, 13 Mar 2007 00:53:34 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Christoph Lameter <clameter@....com>
Cc:	linux-mm@...r.kernel.org, clameter@....com,
	linux-kernel@...r.kernel.org
Subject: Re: [QUICKLIST 0/4] Arch independent quicklists V2

> On Tue, 13 Mar 2007 00:13:25 -0700 (PDT) Christoph Lameter <clameter@....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?

(Will require some work in the page allocator)
(That work will open the path to using the idle thread to prezero pages)
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