From: Ingo Molnar <mingo@elte.hu>
To: Yong Wang <yong.y.wang@linux.intel.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: 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 15:23:13 +0200 [thread overview]
Message-ID: <20090609132313.GE25586@elte.hu> (raw)
In-Reply-To: <20090609074621.GA19290@ywang-moblin2.bj.intel.com>
* 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 ;-)
Ingo
next prev parent reply other threads:[~2009-06-09 13:23 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 [this message]
2009-06-09 13:32 ` Yong Wang
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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