From: Mikael Pettersson <mikpe@csd.uu.se>
To: Philippe Elie <phil.el@wanadoo.fr>
Cc: Andrew Morton <akpm@osdl.org>,
linux-kernel@vger.kernel.org, Will Cohen <wcohen@redhat.com>,
John Levon <levon@movementarian.org>
Subject: Re: [PATCH] oprofile add Pentium Mobile support
Date: Mon, 16 Feb 2004 11:23:52 +0100 [thread overview]
Message-ID: <16432.39480.817800.21083@alkaid.it.uu.se> (raw)
In-Reply-To: <20040212224152.GE316@zaniah>
Philippe Elie writes:
> From: Will Cohen <wcohen@redhat.com>
>
> Add oprofile support for Pentium Mobile (P6 core). Pentium Mobile needs
> to unmask LVPTC vector, since it doesn't hurt other P6 core based cpus
> we do it unconditionally for all these.
[Patch talking about the Pentium-M.]
I can find no support in Intel's documentation (IA32 Volume 3,
25366813.pdf) that Pentium-M:s need to unmask LVTPC.
How certain are you of this? Is this an undocumented hardware
quirk? If it is documented, please indicate where.
It's my theory that P4 added the auto-masking to help PEBS
buffer overflow situations, but since P-M doesn't have PEBS,
they shouldn't have had to change this on P-M as well.
OTOH, it's certainly possible they changed it by accident.
One way of testing this would be to run a P-M with
nmi_watchdog=2. If the NMI counter keeps ticking, then
LVTPC does not need unmasking.
/Mikael
next prev parent reply other threads:[~2004-02-16 10:25 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-02-12 22:41 Philippe Elie
2004-02-16 10:23 ` Mikael Pettersson [this message]
2004-02-16 13:55 ` Will Cohen
2004-02-16 14:20 ` Mikael Pettersson
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