From: "Chris Friesen" <cfriesen@nortel.com>
To: eranian@gmail.com
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>,
Vince Weaver <vince@deater.net>, Ingo Molnar <mingo@elte.hu>,
linux-kernel@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
Andrew Morton <akpm@linux-foundation.org>,
Eric Dumazet <dada1@cosmosbay.com>,
Robert Richter <robert.richter@amd.com>,
Arjan van de Veen <arjan@infradead.org>,
Peter Anvin <hpa@zytor.com>, Paul Mackerras <paulus@samba.org>,
"David S. Miller" <davem@davemloft.net>
Subject: Re: [patch] Performance Counters for Linux, v3
Date: Fri, 12 Dec 2008 13:45:45 -0600 [thread overview]
Message-ID: <4942BF69.4030402@nortel.com> (raw)
In-Reply-To: <7c86c4470812121001i765d663bq6db3080b633a1eef@mail.gmail.com>
stephane eranian wrote:
> What happens in the following test case:
>
> - 2-way system (cpu0, cpu1)
>
> - on cpu0, two processes P1, P2, each self-monitoring and counting event E1.
> Event E1 can only be measured on counter C1.
>
> - on cpu1, there is a cpu-wide session, monitoring event E1, thus using C1
>
> - the scheduler decides to migrate P1 onto CPU1. You now have a
> conflict on C1.
>
> How is this managed?
Prevent the load balancer from moving P1 onto cpu1?
Chris
next prev parent reply other threads:[~2008-12-12 19:46 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-11 15:52 [patch] Performance Counters for Linux, v3 Ingo Molnar
2008-12-11 18:02 ` Vince Weaver
2008-12-12 8:25 ` Peter Zijlstra
2008-12-12 8:35 ` stephane eranian
2008-12-12 8:51 ` Peter Zijlstra
2008-12-12 9:00 ` Peter Zijlstra
2008-12-12 9:07 ` Ingo Molnar
2008-12-12 8:59 ` stephane eranian
2008-12-12 9:23 ` Peter Zijlstra
2008-12-12 10:21 ` Robert Richter
2008-12-12 10:59 ` Christoph Hellwig
2008-12-12 11:35 ` Robert Richter
2008-12-12 16:45 ` Chris Friesen
2008-12-12 17:42 ` stephane eranian
2008-12-12 18:01 ` stephane eranian
2008-12-12 19:45 ` Chris Friesen [this message]
2008-12-15 14:50 ` stephane eranian
2008-12-15 22:32 ` Chris Friesen
2008-12-17 7:45 ` stephane eranian
2008-12-14 23:13 ` Ingo Molnar
2008-12-15 0:37 ` Paul Mackerras
2008-12-15 12:58 ` stephane eranian
2008-12-15 14:42 ` stephane eranian
2008-12-15 20:58 ` stephane eranian
2008-12-15 22:53 ` Paul Mackerras
2008-12-13 11:17 ` Peter Zijlstra
2008-12-13 13:48 ` Henrique de Moraes Holschuh
2008-12-13 17:44 ` stephane eranian
2008-12-14 1:02 ` Paul Mackerras
2008-12-14 22:37 ` Ingo Molnar
2008-12-15 0:50 ` Paul Mackerras
2008-12-15 13:02 ` stephane eranian
2008-12-12 17:03 ` Samuel Thibault
2008-12-12 17:11 ` Peter Zijlstra
2008-12-12 18:18 ` Vince Weaver
2008-12-11 18:35 ` Andrew Morton
2008-12-12 6:22 ` Ingo Molnar
2008-12-11 19:11 ` Tony Luck
2008-12-11 19:34 ` Ingo Molnar
2008-12-12 8:29 ` Peter Zijlstra
2008-12-12 8:54 ` Ingo Molnar
2008-12-12 13:42 ` Andi Kleen
2008-12-14 14:51 ` Performance counter API review was " Andi Kleen
2009-02-02 20:03 ` Corey Ashford
2009-02-02 20:33 ` Peter Zijlstra
2009-02-03 16:53 ` Maynard Johnson
2009-02-04 2:18 ` Paul Mackerras
2009-02-04 2:32 ` Nathan Lynch
2009-02-04 8:45 ` Peter Zijlstra
2009-02-04 10:47 ` Paul Mackerras
2009-02-04 10:51 ` Peter Zijlstra
-- strict thread matches above, loose matches on Subject: below --
2008-12-11 22:05 William Cohen
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