From: William Lee Irwin III <wli@holomorphy.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Nick Piggin <npiggin@suse.de>,
Christoph Lameter <clameter@sgi.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux Memory Management List <linux-mm@kvack.org>,
linux-arch@vger.kernel.org
Subject: Re: [rfc] increase struct page size?!
Date: Sun, 20 May 2007 00:26:05 -0700 [thread overview]
Message-ID: <20070520072605.GE19966@holomorphy.com> (raw)
In-Reply-To: <20070519150934.bdabc9b5.akpm@linux-foundation.org>
On Sat, 19 May 2007 11:15:01 -0700 William Lee Irwin III <wli@holomorphy.com> wrote:
>> Much the same holds for the atomic_t's; 32 + PAGE_SHIFT is
>> 44 bits or more, about as much as is possible, and one reference per
>> page per page is not even feasible. Full-length atomic_t's are just
>> not necessary.
On Sat, May 19, 2007 at 03:09:34PM -0700, Andrew Morton wrote:
> You can overflow a page's refcount by mapping it 4G times. That requires
> 32GB of pagetable memory. It's quite feasible with remap_file_pages().
Oh dear, worst-case app behavior. I'm just wrong.
-- wli
WARNING: multiple messages have this Message-ID (diff)
From: William Lee Irwin III <wli@holomorphy.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Nick Piggin <npiggin@suse.de>,
Christoph Lameter <clameter@sgi.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux Memory Management List <linux-mm@kvack.org>,
linux-arch@vger.kernel.org
Subject: Re: [rfc] increase struct page size?!
Date: Sun, 20 May 2007 00:26:05 -0700 [thread overview]
Message-ID: <20070520072605.GE19966@holomorphy.com> (raw)
In-Reply-To: <20070519150934.bdabc9b5.akpm@linux-foundation.org>
On Sat, 19 May 2007 11:15:01 -0700 William Lee Irwin III <wli@holomorphy.com> wrote:
>> Much the same holds for the atomic_t's; 32 + PAGE_SHIFT is
>> 44 bits or more, about as much as is possible, and one reference per
>> page per page is not even feasible. Full-length atomic_t's are just
>> not necessary.
On Sat, May 19, 2007 at 03:09:34PM -0700, Andrew Morton wrote:
> You can overflow a page's refcount by mapping it 4G times. That requires
> 32GB of pagetable memory. It's quite feasible with remap_file_pages().
Oh dear, worst-case app behavior. I'm just wrong.
-- wli
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next prev parent reply other threads:[~2007-05-20 7:26 UTC|newest]
Thread overview: 110+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-18 4:08 [rfc] increase struct page size?! Nick Piggin
2007-05-18 4:08 ` Nick Piggin
2007-05-18 4:47 ` David Miller
2007-05-18 4:47 ` David Miller, Nick Piggin
2007-05-18 5:12 ` Nick Piggin
2007-05-18 5:12 ` Nick Piggin
2007-05-18 5:22 ` David Miller
2007-05-18 5:22 ` David Miller, Nick Piggin
2007-05-18 5:31 ` Nick Piggin
2007-05-18 5:31 ` Nick Piggin
2007-05-18 18:15 ` Christoph Lameter
2007-05-18 18:15 ` Christoph Lameter
2007-05-18 7:19 ` Andrew Morton
2007-05-18 7:19 ` Andrew Morton
2007-05-18 7:32 ` Nick Piggin
2007-05-18 7:32 ` Nick Piggin
2007-05-18 7:43 ` Andrew Morton
2007-05-18 7:43 ` Andrew Morton
2007-05-18 7:59 ` Nick Piggin
2007-05-18 7:59 ` Nick Piggin
2007-05-18 9:42 ` David Howells
2007-05-18 9:42 ` David Howells
2007-05-19 1:30 ` Nick Piggin
2007-05-19 1:30 ` Nick Piggin
2007-05-19 1:30 ` Nick Piggin
2007-05-18 12:06 ` Andi Kleen
2007-05-18 12:06 ` Andi Kleen
2007-05-18 15:42 ` Hugh Dickins
2007-05-18 15:42 ` Hugh Dickins
2007-05-19 1:22 ` Nick Piggin
2007-05-19 1:22 ` Nick Piggin
2007-05-19 17:53 ` William Lee Irwin III
2007-05-19 17:53 ` William Lee Irwin III
2007-05-20 22:50 ` Matthew Wilcox
2007-05-20 22:50 ` Matthew Wilcox
2007-05-18 18:14 ` Christoph Lameter
2007-05-18 18:14 ` Christoph Lameter
2007-05-18 20:37 ` Luck, Tony
2007-05-18 20:37 ` Luck, Tony
2007-05-18 20:37 ` Luck, Tony
2007-05-21 6:28 ` KAMEZAWA Hiroyuki
2007-05-21 6:28 ` KAMEZAWA Hiroyuki
2007-05-19 1:25 ` Nick Piggin
2007-05-19 1:25 ` Nick Piggin
2007-05-19 2:03 ` [rfc] increase struct page size?! (now sparsemem vmemmap) Christoph Lameter
2007-05-19 2:03 ` Christoph Lameter
2007-05-19 15:43 ` Andy Whitcroft
2007-05-19 15:43 ` Andy Whitcroft
2007-05-19 18:15 ` [rfc] increase struct page size?! William Lee Irwin III
2007-05-19 18:15 ` William Lee Irwin III
2007-05-19 18:25 ` Christoph Lameter
2007-05-19 18:25 ` Christoph Lameter
2007-05-20 4:10 ` Eric Dumazet
2007-05-20 4:10 ` Eric Dumazet
2007-05-20 12:56 ` Andi Kleen
2007-05-20 12:56 ` Andi Kleen
2007-05-21 17:08 ` Christoph Lameter
2007-05-21 17:08 ` Christoph Lameter
2007-05-22 0:30 ` KAMEZAWA Hiroyuki
2007-05-22 0:30 ` KAMEZAWA Hiroyuki
2007-05-22 0:38 ` Christoph Lameter
2007-05-22 0:38 ` Christoph Lameter
2007-05-22 0:58 ` KAMEZAWA Hiroyuki
2007-05-22 0:58 ` KAMEZAWA Hiroyuki
2007-05-22 9:44 ` Geert Uytterhoeven
2007-05-22 9:44 ` Geert Uytterhoeven
2007-05-19 22:09 ` Andrew Morton
2007-05-19 22:09 ` Andrew Morton
2007-05-20 7:26 ` William Lee Irwin III [this message]
2007-05-20 7:26 ` William Lee Irwin III
2007-05-21 9:12 ` Helge Hafting
2007-05-21 9:12 ` Helge Hafting
2007-05-21 9:45 ` Nick Piggin
2007-05-21 9:45 ` Nick Piggin
2007-05-20 5:22 ` Nick Piggin
2007-05-20 5:22 ` Nick Piggin
2007-05-20 8:46 ` William Lee Irwin III
2007-05-20 8:46 ` William Lee Irwin III
2007-05-20 9:25 ` Nick Piggin
2007-05-20 9:25 ` Nick Piggin
2007-05-21 8:08 ` William Lee Irwin III
2007-05-21 8:08 ` William Lee Irwin III
2007-05-21 9:27 ` Nick Piggin
2007-05-21 9:27 ` Nick Piggin
2007-05-21 11:26 ` William Lee Irwin III
2007-05-21 11:26 ` William Lee Irwin III
2007-05-22 0:52 ` Nick Piggin
2007-05-22 0:52 ` Nick Piggin
2007-05-21 22:43 ` Matt Mackall
2007-05-21 22:43 ` Matt Mackall
2007-05-22 1:08 ` Nick Piggin
2007-05-22 1:08 ` Nick Piggin
2007-05-22 1:13 ` Christoph Lameter
2007-05-22 1:13 ` Christoph Lameter
2007-05-22 1:39 ` William Lee Irwin III
2007-05-22 1:39 ` William Lee Irwin III
2007-05-22 1:57 ` Nick Piggin
2007-05-22 1:57 ` Nick Piggin
2007-05-22 5:04 ` William Lee Irwin III
2007-05-22 5:04 ` William Lee Irwin III
2007-05-22 6:24 ` Nick Piggin
2007-05-22 6:24 ` Nick Piggin
2007-05-22 10:59 ` William Lee Irwin III
2007-05-22 10:59 ` William Lee Irwin III
2007-05-21 9:31 ` Eric Dumazet
2007-05-21 9:31 ` Eric Dumazet
2007-05-21 17:06 ` Christoph Lameter
2007-05-21 17:06 ` Christoph Lameter
2007-05-20 17:13 ` Andrea Arcangeli
2007-05-20 17:13 ` Andrea Arcangeli
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