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From: "H. Peter Anvin" <hpa@zytor.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Jeremy Fitzhardinge <jeremy@goop.org>, Andi Kleen <ak@suse.de>,
	Zachary Amsden <zach@vmware.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] i386: For debugging, make the initial page table setup less forgiving.
Date: Wed, 25 Apr 2007 10:56:53 -0700	[thread overview]
Message-ID: <462F9665.1090602@zytor.com> (raw)
In-Reply-To: <m1irbks5qa.fsf@ebiederm.dsl.xmission.com>

Eric W. Biederman wrote:
>> This patch only affects the initial page tables, which should have been
>> thrown out *way* long ago at this point.
> 
> Yes.  I noticed this was happening a few days ago.
> I must not have mentioned it loudly enough.

You mentioned the continued use of init_mm.  This is *very* different.

What we're seeing here is that ON PSE-CAPABLE HARDWARE, we continue to
not just use the init_mm page directory, but the actual page *tables*,
which should all have been replaced with PSE large pages to begin with.

Reusing the initial page tables on non-PSE-capable hardware *sort of*
makes sense, but his hardware should not fall in that category, I don't
think?  (Unless it's one of these machines that fall over if you map the
bottom 4 MB with PSE pages?)

	-hpa

  reply	other threads:[~2007-04-25 17:57 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-04-13 21:49 H. Peter Anvin
2007-04-13 22:18 ` Zachary Amsden
2007-04-13 22:26   ` H. Peter Anvin
2007-04-13 22:40     ` Zachary Amsden
2007-04-13 22:26   ` Jeremy Fitzhardinge
2007-04-25 11:48 ` Andrew Morton
2007-04-25 15:28   ` H. Peter Anvin
2007-04-25 17:50     ` Eric W. Biederman
2007-04-25 17:56       ` H. Peter Anvin [this message]
2007-04-25 18:23         ` Eric W. Biederman
2007-04-25 18:18       ` Jeremy Fitzhardinge
2007-04-25 19:01         ` Eric W. Biederman
2007-04-25 19:19           ` Jeremy Fitzhardinge
2007-04-25 22:08           ` Jeremy Fitzhardinge
2007-04-25 22:27             ` Eric W. Biederman
2007-04-25 23:08               ` Jeremy Fitzhardinge
2007-04-25 23:45                 ` Eric W. Biederman
2007-04-26  0:14                   ` Jeremy Fitzhardinge
2007-04-27  5:02                     ` Eric W. Biederman
2007-04-26  3:27                   ` Zachary Amsden

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