From: Yong Wang <yong.y.wang@linux.intel.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>,
Thomas Gleixner <tglx@linutronix.de>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH -tip] perf_counter/x86: Fix incorrect default branch
Date: Tue, 9 Jun 2009 21:32:32 +0800 [thread overview]
Message-ID: <20090609133232.GA14642@ywang-moblin2.bj.intel.com> (raw)
In-Reply-To: <20090609132313.GE25586@elte.hu>
On Tue, Jun 09, 2009 at 03:23:13PM +0200, Ingo Molnar wrote:
>
> * Yong Wang <yong.y.wang@linux.intel.com> wrote:
>
> > The event selector and UMASK values of Nehalem do not apply to all
> > Intel processors.
>
> The idea was to offer _some_ sort of table on new CPUs, instead of
> nothing...
>
> Eventually Intel stops changing those model specific index values in
> future CPUs and puts them into architectural perfmon, for
> fundamental stats like L1/LLC cache statistics.
>
> In that case defaulting to the latest (known) enumeration might work
> out to be just the thing used by all future CPUs.
>
> So this is a subtle hint ;-)
>
I see what you mean. You talked about future cpus. But what about those
old ones that are not atom, core2 or nehalem? Forget about them?
Thanks
-Yong
next prev parent reply other threads:[~2009-06-09 13:49 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-09 7:46 [PATCH -tip] perf_counter/x86: Fix incorrect default branch Yong Wang
2009-06-09 13:23 ` Ingo Molnar
2009-06-09 13:32 ` Yong Wang [this message]
2009-06-09 14:25 ` Ingo Molnar
2009-06-10 5:15 ` Yong Wang
2009-06-10 10:44 ` Ingo Molnar
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