From: Andi Kleen <andi@firstfloor.org>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Andi Kleen <andi@firstfloor.org>,
eranian@gmail.com, LKML <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>,
Robert Richter <robert.richter@amd.com>,
Paul Mackerras <paulus@samba.org>,
Maynard Johnson <mpjohn@us.ibm.com>, Carl Love <cel@us.ibm.com>,
Corey J Ashford <cjashfor@us.ibm.com>,
Philip Mucci <mucci@eecs.utk.edu>,
Dan Terpstra <terpstra@eecs.utk.edu>,
perfmon2-devel <perfmon2-devel@lists.sourceforge.net>
Subject: Re: comments on Performance Counters for Linux (PCL)
Date: Fri, 29 May 2009 10:53:09 +0200 [thread overview]
Message-ID: <20090529085309.GP1065@one.firstfloor.org> (raw)
In-Reply-To: <1243585158.23657.175.camel@twins>
> You're talking about VT stuff, right?
Yes.
> Does that virtualize the PMU too?
A hypervisor can in software, but another common case is a global profiler on
the host to be able to profile all guests too. e.g. xenoprofile is able to do
that.
If you want a full system picture with virtualization that's pretty much
required.
For that you need a concept of more priviledge levels (host user, host sys,
guest user, guest sys)
> Happen to have more details? If they really run in user context their
> priv level would be the same right, otherwise they run in something
> weird, not quite user not quite kernel. Now that might be the case, but
> I'm utterly ignorant on itanic.
See Documentation/ia64/fsys.txt
-Andi
--
ak@linux.intel.com -- Speaking for myself only.
next prev parent reply other threads:[~2009-05-29 8:46 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-28 14:58 comments on Performance Counters for Linux (PCL) stephane eranian
2009-05-28 16:25 ` Peter Zijlstra
2009-05-28 16:47 ` Peter Zijlstra
2009-05-28 21:06 ` [perfmon2] " Corey Ashford
2009-05-28 21:35 ` Ingo Molnar
2009-05-28 23:24 ` Paul Mackerras
2009-05-29 7:19 ` Ingo Molnar
2009-05-29 8:21 ` Geert Uytterhoeven
2009-05-29 14:42 ` Carl Love
2009-05-30 19:16 ` Ingo Molnar
2009-05-29 10:50 ` stephane eranian
2009-05-29 10:53 ` stephane eranian
2009-05-29 6:51 ` Andi Kleen
2009-05-29 8:19 ` Peter Zijlstra
2009-05-29 8:53 ` Andi Kleen [this message]
2009-05-29 16:13 ` [perfmon2] " Luck, Tony
2009-05-29 10:43 ` stephane eranian
2009-05-29 15:02 ` Peter Zijlstra
2009-05-29 15:59 ` stephane eranian
2009-05-29 20:32 ` Peter Zijlstra
2009-05-29 20:49 ` stephane eranian
-- strict thread matches above, loose matches on Subject: below --
2009-05-28 14:53 eranian
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