From: Rene Herman <rene.herman@keyaccess.nl>
To: Linus Torvalds <torvalds@osdl.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
Arjan van de Ven <arjan@linux.intel.com>, Andi Kleen <ak@suse.de>,
linux-kernel@vger.kernel.org, akpm@osdl.org, mingo@elte.hu
Subject: Re: Patch to reorder functions in the vmlinux to a defined order
Date: Fri, 24 Feb 2006 18:57:06 +0100 [thread overview]
Message-ID: <43FF48F2.70508@keyaccess.nl> (raw)
In-Reply-To: <Pine.LNX.4.64.0602240925170.3771@g5.osdl.org>
Linus Torvalds wrote:
> The real issue is the _physical_ address. Nothing else matters.
>
> If the TLB splitting on the fixed MTRRs is an issue, it depends entirely
> on what physical address the kernel resides in, and the virtual address is
> totally inconsequential.
>
> So playing games with virtual mapping has absolutely no upsides, and it
> definitely has downsides.
The notion was that having a fixed virtual mapping of the kernel would
allow it to be loaded anywhere physically without needing to do actual
address fixups. The bootloader could then for example at runtime decide
to load the kernel at 16MB if the machine had enough memory available,
to free up ZONE_DMA. Or not do that if running on a <= 16MB machine.
Or the kdump "host" kernel would make that decission, as it seems the
want is shared with them. Eric Biederman said that fixups aren't that
bad though...
Rene.
next prev parent reply other threads:[~2006-02-24 17:56 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-23 13:19 Patch to make the head.S-must-be-first-in-vmlinux order explicit Arjan van de Ven
2006-02-23 13:42 ` Andi Kleen
2006-02-23 13:57 ` Arjan van de Ven
2006-02-23 14:14 ` Andi Kleen
2006-02-23 14:40 ` Arjan van de Ven
2006-02-24 13:49 ` Eric W. Biederman
2006-02-24 13:53 ` Arjan van de Ven
2006-02-24 14:17 ` Eric W. Biederman
2006-02-24 14:32 ` Andi Kleen
2006-02-23 15:09 ` Patch to reorder functions in the vmlinux to a defined order Arjan van de Ven
2006-02-23 16:00 ` Andi Kleen
2006-02-23 16:02 ` Arjan van de Ven
2006-02-23 16:43 ` Arjan van de Ven
2006-02-23 16:48 ` Andi Kleen
2006-02-23 16:49 ` Arjan van de Ven
2006-02-23 17:08 ` Linus Torvalds
2006-02-23 17:20 ` Andi Kleen
2006-02-23 17:34 ` Alan Cox
2006-02-23 18:13 ` Andi Kleen
2006-02-23 17:44 ` Linus Torvalds
2006-02-23 18:14 ` Andi Kleen
2006-02-23 19:03 ` linux-os (Dick Johnson)
2006-02-23 19:32 ` Linus Torvalds
2006-02-24 12:43 ` linux-os (Dick Johnson)
2006-02-23 19:23 ` Rene Herman
2006-02-23 19:31 ` Andi Kleen
2006-02-23 19:34 ` Alan Cox
2006-02-23 19:48 ` Rene Herman
2006-02-23 19:35 ` Linus Torvalds
2006-02-23 19:44 ` Arjan van de Ven
2006-02-23 20:13 ` Rene Herman
2006-02-23 20:26 ` Dave Jones
2006-02-24 2:44 ` Fernando Luis Vazquez Cao
2006-02-24 2:47 ` Andi Kleen
2006-02-24 14:44 ` Theodore Ts'o
2006-02-23 23:19 ` Linus Torvalds
2006-02-23 23:53 ` Rene Herman
2006-02-24 14:23 ` Eric W. Biederman
2006-02-24 14:23 ` Eric W. Biederman
2006-02-24 15:30 ` Rene Herman
2006-02-24 15:55 ` Eric W. Biederman
2006-02-24 16:48 ` Andi Kleen
2006-02-24 20:38 ` Eric W. Biederman
2006-02-25 2:11 ` Folkert van Heusden
2006-02-25 8:32 ` Arjan van de Ven
2006-02-24 17:26 ` Linus Torvalds
2006-02-24 17:57 ` Rene Herman [this message]
2006-02-24 18:11 ` Linus Torvalds
2006-03-07 23:36 ` H. Peter Anvin
2006-02-24 14:11 ` Eric W. Biederman
2006-02-24 1:38 ` Martin Bligh
2006-02-23 20:07 ` Andy Whitcroft
2006-02-23 16:48 ` Linus Torvalds
2006-02-23 16:54 ` Benjamin LaHaise
2006-02-23 18:01 ` Arjan van de Ven
2006-02-23 16:57 ` linux-os (Dick Johnson)
2006-02-23 17:36 ` Zwane Mwaikambo
2006-02-23 17:59 ` Arjan van de Ven
2006-02-24 22:19 ` Tony Luck
2006-02-24 22:21 ` Arjan van de Ven
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