From: Corey Ashford <cjashfor@linux.vnet.ibm.com>
To: William Cohen <wcohen@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>,
linux-kernel@vger.kernel.org,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
"David S. Miller" <davem@davemloft.net>,
Robert Richter <robert.richter@amd.com>,
Eric Dumazet <dada1@cosmosbay.com>,
Stephane Eranian <eranian@googlemail.com>,
Paul Mackerras <paulus@samba.org>, Peter Anvin <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>,
Andrew Morton <akpm@linux-foundation.org>,
perfctr-devel@lists.sourceforge.net,
Arjan van de Ven <arjan@infradead.org>
Subject: Re: [Perfctr-devel] [patch] Performance Counters for Linux, v4
Date: Wed, 17 Dec 2008 12:53:55 -0800 [thread overview]
Message-ID: <494966E3.2020506@linux.vnet.ibm.com> (raw)
In-Reply-To: <49492210.1070007@redhat.com>
William Cohen wrote:
> Ingo Molnar wrote:
>> We are pleased to announce the v4 release of our performance counters
>> subsystem implementation. The kernel changes can be picked up from:
>>
>> git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git
>> perfcounters/core
>>
>> (also in the master branch. There's also a kernel patch attached
>> below.)
>
> Machines that support virtualization are becoming very common. How is
> this performance monitoring support going to work with virtualization
> (e.g. KVM)? Having the performance counters only work on physical
> machines would be pretty limiting.
On Power machines, the PMU counter registers are virtualized by the
hypervisor, at the request of the OS, on a per-cpu/per-partition basis.
So this issue is handled transparently on Power anyway.
- Corey
Corey Ashford
Software Engineer
IBM Linux Technology Center, Linux Toolchain
Beaverton, OR
503-578-3507
cjashfor@us.ibm.com
prev parent reply other threads:[~2008-12-17 20:54 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-14 21:28 [patch] Performance Counters for Linux, v4 Ingo Molnar
2008-12-15 11:59 ` Paul Mackerras
2008-12-15 12:11 ` Paul Mackerras
2008-12-16 14:22 ` Peter Zijlstra
2008-12-16 23:06 ` Paul Mackerras
2008-12-16 23:51 ` Ingo Molnar
2008-12-17 1:55 ` Andi Kleen
2009-01-16 18:01 ` Corey Ashford
2009-01-16 22:14 ` Maynard Johnson
2009-01-16 23:11 ` Ingo Molnar
2009-01-17 1:26 ` Paul Mackerras
2009-01-17 9:53 ` Andi Kleen
2008-12-17 2:23 ` [Perfctr-devel] " Dan Terpstra
2008-12-17 7:34 ` stephane eranian
2008-12-15 17:44 ` Vince Weaver
2008-12-15 21:07 ` Vince Weaver
2008-12-15 22:13 ` Paul Mackerras
2008-12-15 21:42 ` Paul Mackerras
2008-12-15 22:03 ` stephane eranian
2008-12-16 14:42 ` Peter Zijlstra
2008-12-16 16:55 ` Vince Weaver
2008-12-16 21:52 ` Paul Mackerras
2008-12-16 12:22 ` Pavel Machek
2008-12-16 12:50 ` Ingo Molnar
2008-12-16 12:57 ` Pavel Machek
2008-12-16 13:03 ` Ingo Molnar
2008-12-16 13:13 ` Arjan van de Ven
2008-12-16 20:04 ` Pavel Machek
2008-12-16 14:45 ` Peter Zijlstra
2008-12-16 15:46 ` [Perfctr-devel] " Martin Cracauer
2008-12-16 17:38 ` Vince Weaver
2008-12-16 19:47 ` Corey Ashford
2008-12-16 20:55 ` Vince Weaver
2008-12-16 19:56 ` [Perfctr-devel] " William Cohen
2008-12-17 1:51 ` Andi Kleen
2008-12-17 1:56 ` Samuel Thibault
[not found] ` <d484eb1f0812162357n7a851f2fncc0abaae9bd293a4@mail.gmail.com>
2008-12-17 9:18 ` Andi Kleen
[not found] ` <d484eb1f0812170611s597e014cl5fb98d6dd81afd49@mail.gmail.com>
2008-12-17 15:06 ` Andi Kleen
2008-12-17 16:00 ` William Cohen
2008-12-17 20:53 ` Corey Ashford [this message]
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