From: "H. Peter Anvin" <hpa@zytor.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] Early memory patch, +accounting
Date: Thu, 26 Feb 2004 10:02:25 -0800 [thread overview]
Message-ID: <403E34B1.3030608@zytor.com> (raw)
In-Reply-To: <m1oerlevny.fsf_-_@ebiederm.dsl.xmission.com>
Eric W. Biederman wrote:
>
> I intend to export _end into setup.S so a bootloader can
> tell what memory the kernel will attempt to use before looking at
> the e820 map, the kernel command line, and the initrd location.
> After that the kernel can properly dynamically allocate things.
>
You're confusing "may" with "will". This is the fundamental problem
with this approach.
> Exporting _end will allow two things.
> 1) On systems with a 15M-16M I/O hole the bootloader can check to see
> if a big kernel will attempt to use memory in that region.
>
> 2) On small memory systems it will let the bootloader make a good
> estimate to see if everything will fit into memory.
No, it won't, because it still has no idea whatsoever how much
dynamically allocated memory it needs during boot.
-hpa
next prev parent reply other threads:[~2004-02-26 18:02 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-02-24 5:10 Early memory patch, revised H. Peter Anvin
2004-02-25 18:26 ` Eric W. Biederman
2004-02-25 18:38 ` H. Peter Anvin
2004-02-25 18:49 ` H. Peter Anvin
2004-02-26 14:56 ` [PATCH] Early memory patch, +accounting Eric W. Biederman
2004-02-26 18:02 ` H. Peter Anvin [this message]
2004-03-01 7:06 ` Eric W. Biederman
2004-02-26 6:16 ` Early memory patch, revised Eric W. Biederman
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