From: "Roedel, Joerg" <Joerg.Roedel@amd.com>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>, Ingo Molnar <mingo@elte.hu>,
Arnaldo Carvalho de Melo <acme@ghostprotocols.net>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
benh <benh@kernel.crashing.org>,
Anton Blanchard <anton@samba.org>, davem <davem@davemloft.net>
Subject: Re: [PATCH 2/3] perf, x86: Use GO/HO bits in perf-ctr
Date: Tue, 10 May 2011 17:04:12 +0200 [thread overview]
Message-ID: <20110510150412.GB30996@amd.com> (raw)
In-Reply-To: <1305038900.2914.97.camel@laptop>
On Tue, May 10, 2011 at 10:48:20AM -0400, Peter Zijlstra wrote:
> On Tue, 2011-05-10 at 16:35 +0200, Joerg Roedel wrote:
> > The AMD perf-counters support counting in guest or host-mode
> > only. Make use of that feature when user-space specified
> > guest/host-mode only counting.
>
> Subject mentions x86, does Intel have anything similar so you can make
> it work for them too?
Intel does not support guest or host-only counting in the hardware (at
least according to my documentation). If wanted it could be approximated by
enabling/disabling the counters in the guest-entry path.
So subject should better say "perf, amd", right?
> Also, might be nice to ask the power and sparc64 people if their archs
> can also differentiate between guest and host thingies.
Right, I don't know if their hardware has similar features. I'll try to
find this out.
Joerg
next prev parent reply other threads:[~2011-05-10 15:05 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-10 14:35 [RFC][PATCH 0/3] perf support for amd guest/host-only bits Joerg Roedel
2011-05-10 14:35 ` [PATCH 1/3] perf, core: Introduce attrs to count in either host or guest mode Joerg Roedel
2011-05-10 14:45 ` Peter Zijlstra
2011-05-10 14:59 ` Roedel, Joerg
2011-05-10 15:18 ` Peter Zijlstra
2011-05-10 15:38 ` Roedel, Joerg
2011-05-10 16:07 ` Peter Zijlstra
2011-05-10 16:25 ` Roedel, Joerg
2011-05-11 11:44 ` Avi Kivity
2011-05-11 11:45 ` Avi Kivity
2011-05-11 13:49 ` Peter Zijlstra
2011-05-11 13:52 ` Avi Kivity
2011-05-11 14:02 ` Ingo Molnar
2011-05-10 14:35 ` [PATCH 2/3] perf, x86: Use GO/HO bits in perf-ctr Joerg Roedel
2011-05-10 14:48 ` Peter Zijlstra
2011-05-10 15:04 ` Roedel, Joerg [this message]
2011-05-11 12:58 ` Avi Kivity
2011-05-12 9:21 ` Joerg Roedel
2011-05-10 14:35 ` [PATCH 3/3] perf, tools: Add support for guest/host-only profiling Joerg Roedel
2011-05-10 14:50 ` Peter Zijlstra
2011-05-10 15:08 ` Roedel, Joerg
2011-05-10 15:25 ` Peter Zijlstra
2011-05-10 15:46 ` Roedel, Joerg
2011-05-10 16:09 ` Peter Zijlstra
2011-05-10 15:21 ` [RFC][PATCH 0/3] perf support for amd guest/host-only bits Ingo Molnar
2011-05-10 15:50 ` Roedel, Joerg
2011-05-10 20:41 ` Ingo Molnar
2011-05-11 8:57 ` Joerg Roedel
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