From: Andrea Arcangeli <andrea@suse.de>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Nick Piggin <npiggin@suse.de>, Hugh Dickins <hugh@veritas.com>,
Andrew Morton <akpm@linux-foundation.org>,
Linux Memory Management List <linux-mm@kvack.org>,
tee@sgi.com, holt@sgi.com,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [rfc] no ZERO_PAGE?
Date: Wed, 4 Apr 2007 17:48:39 +0200 [thread overview]
Message-ID: <20070404154839.GI19587@v2.random> (raw)
In-Reply-To: <Pine.LNX.4.64.0704040830500.6730@woody.linux-foundation.org>
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).
WARNING: multiple messages have this Message-ID (diff)
From: Andrea Arcangeli <andrea@suse.de>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Nick Piggin <npiggin@suse.de>, Hugh Dickins <hugh@veritas.com>,
Andrew Morton <akpm@linux-foundation.org>,
Linux Memory Management List <linux-mm@kvack.org>,
tee@sgi.com, holt@sgi.com,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [rfc] no ZERO_PAGE?
Date: Wed, 4 Apr 2007 17:48:39 +0200 [thread overview]
Message-ID: <20070404154839.GI19587@v2.random> (raw)
In-Reply-To: <Pine.LNX.4.64.0704040830500.6730@woody.linux-foundation.org>
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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next prev parent reply other threads:[~2007-04-04 15:48 UTC|newest]
Thread overview: 85+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-29 7:58 [rfc][patch 1/2] mm: dont account ZERO_PAGE Nick Piggin
2007-03-29 7:58 ` [rfc][patch 2/2] mips: reinstate move_pte Nick Piggin
2007-03-29 17:49 ` Linus Torvalds
2007-03-29 13:10 ` [rfc][patch 1/2] mm: dont account ZERO_PAGE Hugh Dickins
2007-03-30 1:46 ` Nick Piggin
2007-03-30 2:59 ` Robin Holt
2007-03-30 3:09 ` Nick Piggin
2007-03-30 9:23 ` Robin Holt
2007-03-30 2:40 ` Nick Piggin
2007-04-04 3:37 ` [rfc] no ZERO_PAGE? Nick Piggin
2007-04-04 3:37 ` Nick Piggin
2007-04-04 9:45 ` Hugh Dickins
2007-04-04 9:45 ` Hugh Dickins
2007-04-04 10:24 ` Nick Piggin
2007-04-04 10:24 ` Nick Piggin
2007-04-04 12:27 ` Andrea Arcangeli
2007-04-04 12:27 ` Andrea Arcangeli
2007-04-04 13:55 ` Dan Aloni
2007-04-04 13:55 ` Dan Aloni
2007-04-04 14:14 ` Andrea Arcangeli
2007-04-04 14:14 ` Andrea Arcangeli
2007-04-04 14:44 ` Dan Aloni
2007-04-04 14:44 ` Dan Aloni
2007-04-04 15:03 ` Hugh Dickins
2007-04-04 15:03 ` Hugh Dickins
2007-04-04 15:34 ` Andrea Arcangeli
2007-04-04 15:34 ` Andrea Arcangeli
2007-04-04 15:41 ` Hugh Dickins
2007-04-04 15:41 ` Hugh Dickins
2007-04-04 16:07 ` Andrea Arcangeli
2007-04-04 16:07 ` Andrea Arcangeli
2007-04-04 16:14 ` Linus Torvalds
2007-04-04 16:14 ` Linus Torvalds
2007-04-04 15:27 ` Andrea Arcangeli
2007-04-04 15:27 ` Andrea Arcangeli
2007-04-04 16:15 ` Dan Aloni
2007-04-04 16:15 ` Dan Aloni
2007-04-04 16:48 ` Andrea Arcangeli
2007-04-04 16:48 ` Andrea Arcangeli
2007-04-04 12:45 ` Hugh Dickins
2007-04-04 12:45 ` Hugh Dickins
2007-04-04 13:05 ` Andrea Arcangeli
2007-04-04 13:05 ` Andrea Arcangeli
2007-04-04 13:32 ` Hugh Dickins
2007-04-04 13:32 ` Hugh Dickins
2007-04-04 13:40 ` Andrea Arcangeli
2007-04-04 13:40 ` Andrea Arcangeli
2007-04-04 15:35 ` Linus Torvalds
2007-04-04 15:35 ` Linus Torvalds
2007-04-04 15:48 ` Andrea Arcangeli [this message]
2007-04-04 15:48 ` Andrea Arcangeli
2007-04-04 16:09 ` Linus Torvalds
2007-04-04 16:09 ` Linus Torvalds
2007-04-04 16:23 ` Andrea Arcangeli
2007-04-04 16:23 ` Andrea Arcangeli
2007-04-04 16:10 ` Hugh Dickins
2007-04-04 16:10 ` Hugh Dickins
2007-04-04 16:31 ` Andrea Arcangeli
2007-04-04 16:31 ` Andrea Arcangeli
2007-04-04 22:07 ` Valdis.Kletnieks
2007-04-04 16:32 ` Eric Dumazet
2007-04-04 16:32 ` Eric Dumazet
2007-04-04 17:02 ` Linus Torvalds
2007-04-04 17:02 ` Linus Torvalds
2007-04-04 19:15 ` Andrew Morton
2007-04-04 19:15 ` Andrew Morton
2007-04-04 20:11 ` David Miller
2007-04-04 20:11 ` David Miller, Linus Torvalds
2007-04-04 20:50 ` Andrew Morton
2007-04-04 20:50 ` Andrew Morton
2007-04-05 2:03 ` Nick Piggin
2007-04-05 2:03 ` Nick Piggin
2007-04-05 5:23 ` Andrea Arcangeli
2007-04-05 5:23 ` Andrea Arcangeli
2007-04-04 22:05 ` Valdis.Kletnieks
2007-04-05 0:27 ` Linus Torvalds
2007-04-05 0:27 ` Linus Torvalds
2007-04-05 1:25 ` Valdis.Kletnieks
2007-04-05 2:30 ` Nick Piggin
2007-04-05 2:30 ` Nick Piggin
2007-04-05 5:37 ` William Lee Irwin III
2007-04-05 5:37 ` William Lee Irwin III
2007-04-05 17:23 ` Valdis.Kletnieks
2007-04-05 4:47 ` Nick Piggin
2007-04-05 4:47 ` Nick Piggin
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