From: "H. Peter Anvin" <hpa@zytor.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>, Andi Kleen <ak@suse.de>,
"Eric W. Biederman" <ebiederm@xmission.com>,
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 08:28:32 -0700 [thread overview]
Message-ID: <462F73A0.40003@zytor.com> (raw)
In-Reply-To: <20070425044813.f83dde4e.akpm@linux-foundation.org>
Andrew Morton wrote:
>
> This patch causes oopses after a minute or so running LTP's
>
> ./testcases/bin/growfiles -W gf16 -b -e 1 -i 0 -L 120 -u -g 4090 -T 100 -t 408990 -l -C 10 -c 1000 -S 10 -f Lgf02_
>
> on everyone's favoutite Vaio, configured with
> http://userweb.kernel.org/~akpm/config-sony.txt
>
*BLINK*
This patch only affects the initial page tables, which should have been
thrown out *way* long ago at this point.
Yet they seem to have stuck around. This is a very bad thing on many
levels, especially since we should have switched the kernel 1:1 area
over to PSE pages a long time ago.
> BUG: unable to handle kernel paging request at virtual address c084fa8c
> printing eip:
> c0174c46
> *pde = 0042a027
> *pte = 00000000
Touching a non-PSE page which is zero, and quite consistent with being a
remnant from the original page tables.
Methinks this has smoked out a bug in the initial page table setup which
probably has been a performance roadblock for quite some time.
-hpa
next prev parent reply other threads:[~2007-04-25 15:29 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-13 21:49 [PATCH] i386: For debugging, make the initial page table setup less forgiving 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 [this message]
2007-04-25 17:50 ` Eric W. Biederman
2007-04-25 17:56 ` H. Peter Anvin
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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