From: Ingo Molnar <mingo@elte.hu>
To: eranian@gmail.com
Cc: LKML <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
Robert Richter <robert.richter@amd.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
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: I.7 - Group validity checking
Date: Mon, 22 Jun 2009 13:54:00 +0200 [thread overview]
Message-ID: <20090622115400.GH24366@elte.hu> (raw)
In-Reply-To: <7c86c4470906161042p7fefdb59y10f8ef4275793f0e@mail.gmail.com>
> 7/ Group validity checking
>
> At the user level, an application is only concerned with events
> and grouping of those events. The assignment logic is performed by
> the kernel.
>
> For a group to be scheduled, all its events must be compatible
> with each other, otherwise the group will never be scheduled. It
> is not clear to me when that sanity check will be performed if I
> create the group such that it is stopped.
The hardware implementation should verify that the group fits on the
PMU for every new group member.
Like said before, we think this and I.2/ are in conflict.
> If the group goes all the way to scheduling, it will never be
> scheduled. Counts will be zero and the users will have no idea
> why. If the group is put in error state, read will not be
> possible. But again, how will the user know why?
It should not be possible to create such a situation. Can you see it
being possible?
next prev parent reply other threads:[~2009-06-22 11:54 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-16 17:42 v2 of comments on Performance Counters for Linux (PCL) stephane eranian
2009-06-22 11:48 ` Ingo Molnar
2009-06-22 11:49 ` I.1 - System calls - ioctl Ingo Molnar
2009-06-22 12:58 ` Christoph Hellwig
2009-06-22 13:56 ` Ingo Molnar
2009-06-22 17:41 ` Arnd Bergmann
2009-07-13 10:53 ` Peter Zijlstra
2009-07-13 17:30 ` [perfmon2] " Arnd Bergmann
2009-07-13 17:34 ` Peter Zijlstra
2009-07-13 17:53 ` Arnd Bergmann
2009-07-14 13:51 ` Christoph Hellwig
2009-07-30 13:58 ` stephane eranian
2009-07-30 14:13 ` Peter Zijlstra
2009-07-30 16:17 ` stephane eranian
2009-07-30 16:40 ` Arnd Bergmann
2009-07-30 16:53 ` stephane eranian
2009-07-30 17:20 ` Arnd Bergmann
2009-08-03 14:22 ` Peter Zijlstra
2009-06-22 11:50 ` I.2 - Grouping Ingo Molnar
2009-06-22 19:45 ` stephane eranian
2009-06-22 22:04 ` Corey Ashford
2009-06-23 17:51 ` stephane eranian
2009-06-22 21:38 ` Corey Ashford
2009-06-23 5:16 ` Paul Mackerras
2009-06-23 7:36 ` stephane eranian
2009-06-23 8:26 ` Paul Mackerras
2009-06-23 8:30 ` stephane eranian
2009-06-23 16:24 ` Corey Ashford
2009-06-22 11:51 ` I.3 - Multiplexing and system-wide Ingo Molnar
2009-06-22 11:51 ` I.4 - Controlling group multiplexing Ingo Molnar
2009-06-22 11:52 ` I.5 - Mmaped count Ingo Molnar
2009-06-22 12:25 ` stephane eranian
2009-06-22 12:35 ` Peter Zijlstra
2009-06-22 12:54 ` stephane eranian
2009-06-22 14:39 ` Peter Zijlstra
2009-06-23 0:41 ` Paul Mackerras
2009-06-23 0:39 ` Paul Mackerras
2009-06-23 6:13 ` Peter Zijlstra
2009-06-23 7:40 ` stephane eranian
2009-06-23 0:33 ` Paul Mackerras
2009-06-22 11:53 ` I.6 - Group scheduling Ingo Molnar
2009-06-22 11:54 ` Ingo Molnar [this message]
2009-06-22 11:54 ` I.8 - Generalized cache events Ingo Molnar
2009-06-22 11:55 ` I.9 - Group reading Ingo Molnar
2009-06-22 11:55 ` I.10 - Event buffer minimal useful size Ingo Molnar
2009-06-22 11:56 ` I.11 - Missing definitions for generic events Ingo Molnar
2009-06-22 14:54 ` stephane eranian
2009-06-22 11:57 ` II.1 - Fixed counters on Intel Ingo Molnar
2009-06-22 14:27 ` stephane eranian
2009-06-22 11:57 ` II.2 - Event knowledge missing Ingo Molnar
2009-06-23 13:18 ` stephane eranian
2009-06-22 11:58 ` III.1 - Sampling period randomization Ingo Molnar
2009-06-22 11:58 ` IV.1 - Support for model-specific uncore PMU Ingo Molnar
2009-06-22 11:59 ` IV.2 - Features impacting all counters Ingo Molnar
2009-06-22 12:00 ` IV.3 - AMD IBS Ingo Molnar
2009-06-22 14:08 ` [perfmon2] " Rob Fowler
2009-06-22 17:58 ` Maynard Johnson
2009-06-23 6:19 ` Peter Zijlstra
2009-06-23 8:19 ` stephane eranian
2009-06-23 14:05 ` Ingo Molnar
2009-06-23 14:25 ` stephane eranian
2009-06-23 14:55 ` Ingo Molnar
2009-06-23 14:40 ` Rob Fowler
2009-06-22 19:17 ` stephane eranian
2009-06-22 12:00 ` IV.4 - Intel PEBS Ingo Molnar
2009-06-22 12:16 ` Andi Kleen
2009-06-22 12:01 ` IV.5 - Intel Last Branch Record (LBR) Ingo Molnar
2009-06-22 20:02 ` stephane eranian
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