From: Matthew Wilcox <matthew@wil.cx>
To: linux-ia64@vger.kernel.org
Subject: Re: [PATCH] - Fix get_model_name() for mixed cpu type systems
Date: Thu, 19 Oct 2006 21:21:37 +0000 [thread overview]
Message-ID: <20061019212137.GN2602@parisc-linux.org> (raw)
In-Reply-To: <20061018212559.GA2965@sgi.com>
On Thu, Oct 19, 2006 at 02:05:19PM -0700, Stephane Eranian wrote:
> I don't think this is going to work for the simple reason that perfmon supports per-thread
> monitoring. As a thread migrates from one CPU to another, its PMU state migrates with it.
> So you cannot reload a full Montecito state onto a Madison PMU. You will not crash, because
> write to unimplemented PMD are ignored but you will get false results. Even in system-wide
> tools are not prepare to cope with mixed configurations.
I suppose you could lock a thread to running only on the kind of CPU it
started running on. It's not a great solution though.
next prev parent reply other threads:[~2006-10-19 21:21 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-18 21:25 [PATCH] - Fix get_model_name() for mixed cpu type systems Jack Steiner
2006-10-18 21:44 ` Stephane Eranian
2006-10-18 21:55 ` Jack Steiner
2006-10-18 22:25 ` Stephane Eranian
2006-10-18 22:38 ` Russ Anderson
2006-10-18 22:57 ` Stephane Eranian
2006-10-19 0:03 ` Luck, Tony
2006-10-19 14:08 ` Jack Steiner
2006-10-19 20:57 ` Russ Anderson
2006-10-19 21:05 ` Stephane Eranian
2006-10-19 21:21 ` Matthew Wilcox [this message]
2006-10-19 21:22 ` Luck, Tony
2006-10-19 21:29 ` Jack Steiner
2006-10-19 21:52 ` Stephane Eranian
2006-10-19 22:11 ` Stephane Eranian
2006-10-20 1:54 ` KAMEZAWA Hiroyuki
2006-10-20 2:03 ` Jack Steiner
2007-03-12 13:07 ` FW: " Jack Steiner
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