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Date: Wed, 4 Apr 2007 17:48:39 +0200
From: Andrea Arcangeli <andrea@...e.de>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Nick Piggin <npiggin@...e.de>, Hugh Dickins <hugh@...itas.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Linux Memory Management List <linux-mm@...ck.org>,
tee@....com, holt@....com,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [rfc] no ZERO_PAGE?
On Wed, Apr 04, 2007 at 08:35:30AM -0700, Linus Torvalds wrote:
> Anyway, I'm not against this, but I can see somebody actually *wanting*
> the ZERO page in some cases. I've used the fact for TLB testing, for
> example, by just doing a big malloc(), and knowing that the kernel will
> re-use the ZERO_PAGE so that I don't get any cache effects (well, at least
> not any *physical* cache effects. Virtually indexed cached will still show
> effects of it, of course, but I haven't cared).
Ok, those cases wanting the same zero page, could be fairly easily
converted to an mmap over /dev/zero (without having to run 4k large
mmap syscalls or nonlinear).
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