linux-kernel - Re: Crash while mapping memory in pagetable

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Message-ID: <461FEB46.3000702@zytor.com>
Date:	Fri, 13 Apr 2007 13:42:46 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Zachary Amsden <zach@...are.com>,
	Chris Wright <chrisw@...s-sol.org>, Andi Kleen <ak@...e.de>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Linus Torvalds <torvalds@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Crash while mapping memory in pagetable_init() (Was: Re: .config)

Jeremy Fitzhardinge wrote:
> H. Peter Anvin wrote:
>> I suggest, for clarity and to minimize bloat:
> 
> I think it would save a page, at most.  But OK.  (Also, if you're
> running !PAE, these pages will actually become part of the init_mm
> pagetable, so there's no memory wastage at all.)

Even with PSE?

However, the main reason I wanted it done that way is to avoid cargo 
cult programming; this makes it much clearer where the numbers actually 
come from.

>> #ifdef CONFIG_X86_PAE
>> # define PAGE_TABLE_SIZE    ((2048+4)*4096)
>> #else
>> # define PAGE_TABLE_SIZE    ((1024+1)*4096)
> 
> 1024 should be enough; the pgd is still swapper_pg_dir, and there are no
> pmds.

Check.

	-hpa
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