From: Rusty Russell <rusty@rustcorp.com.au>
To: William Lee Irwin III <wli@holomorphy.com>
Cc: torvalds@osdl.org, mfedyk@matchmail.com, ebiederm@xmission.com,
anton@mips.complang.tuwien.ac.at, linux-kernel@vger.kernel.org,
phillips@arcor.de
Subject: Re: Page Colouring (was: 2.6.0 Huge pages not working as expected)
Date: Tue, 30 Dec 2003 13:00:29 +1100 [thread overview]
Message-ID: <20031230130029.6183a872.rusty@rustcorp.com.au> (raw)
In-Reply-To: <20031229102319.GW22443@holomorphy.com>
On Mon, 29 Dec 2003 02:23:19 -0800
William Lee Irwin III <wli@holomorphy.com> wrote:
> The fact merely elevating PAGE_SIZE breaks numerous things makes me
> rather suspicious of claims that minimalistic patches can do likewise.
Can you give an example?
One approach is to simply present a larger page size to userspace w/
getpagesize(). This does break ELF programs which have been laid out assuming
the old page size (presumably they try to mprotect the read-only sections).
On PPC, the ELF ABI already insists on a 64k boundary between such sections,
and maybe for others you could simply round appropriately and pray, or do
fine-grained protections (ie. on real pagesize) for that one case.
Rusty.
--
there are those who do and those who hang on and you don't see too
many doers quoting their contemporaries. -- Larry McVoy
next prev parent reply other threads:[~2003-12-30 2:06 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <179fV-1iK-23@gated-at.bofh.it>
[not found] ` <179IS-1VD-13@gated-at.bofh.it>
2003-12-27 20:21 ` Anton Ertl
2003-12-27 20:56 ` Linus Torvalds
2003-12-27 23:31 ` Eric W. Biederman
2003-12-27 23:50 ` William Lee Irwin III
2003-12-28 1:09 ` David S. Miller
2003-12-28 4:53 ` Linus Torvalds
2003-12-28 16:39 ` William Lee Irwin III
2003-12-29 0:36 ` Mike Fedyk
2003-12-29 2:55 ` William Lee Irwin III
2003-12-29 4:09 ` Linus Torvalds
2003-12-29 6:52 ` William Lee Irwin III
2003-12-29 9:14 ` Linus Torvalds
2003-12-29 9:22 ` William Lee Irwin III
2003-12-29 9:33 ` Linus Torvalds
2003-12-29 10:23 ` William Lee Irwin III
2003-12-29 10:59 ` Mike Fedyk
2003-12-29 11:14 ` William Lee Irwin III
2003-12-30 2:00 ` Rusty Russell [this message]
2003-12-30 4:59 ` William Lee Irwin III
[not found] ` <20031229084304.GA31630@elte.hu>
2003-12-29 12:09 ` Ingo Molnar
2003-12-29 12:49 ` William Lee Irwin III
2003-12-29 20:02 ` Subpages (was: Page Colouring) Daniel Phillips
2003-12-29 20:15 ` Linus Torvalds
2003-12-29 21:11 ` Page Colouring (was: 2.6.0 Huge pages not working as expected) Eric W. Biederman
2003-12-29 21:35 ` Linus Torvalds
[not found] ` <17tHK-3K6-21@gated-at.bofh.it>
2003-12-28 17:17 ` Anton Ertl
[not found] <176UD-6vl-3@gated-at.bofh.it>
2003-12-26 21:48 ` Anton Ertl
2003-12-26 23:28 ` Linus Torvalds
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