From: Andi Kleen <andi@firstfloor.org>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: 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>,
Andi Kleen <andi@firstfloor.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 08:51:04 +0200 [thread overview]
Message-ID: <20090529065104.GO1065@one.firstfloor.org> (raw)
In-Reply-To: <1243527919.6645.75.camel@laptop>
> > Take Itanium, it has 4 priv levels and the PMU counters can monitor at
> > any priv levels or combination thereof?
>
> x86 has more priv rings too, but linux only uses 2, kernel (ring 0) and
> user (ring 2 iirc). Does ia64 expose more than 2 priv levels in linux?
In a hardware virtualized environment x86 Linux uses at least four.
And yes ia64 also exposes more I believe, e.g. it has the fancy
"system calls that run in user context"
-Andi
next prev parent reply other threads:[~2009-05-29 6:44 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 [this message]
2009-05-29 8:19 ` Peter Zijlstra
2009-05-29 8:53 ` Andi Kleen
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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