From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: "Roedel, Joerg" <Joerg.Roedel@amd.com>
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>
Subject: Re: [PATCH 3/3] perf, tools: Add support for guest/host-only profiling
Date: Tue, 10 May 2011 18:09:46 +0200 [thread overview]
Message-ID: <1305043786.2914.115.camel@laptop> (raw)
In-Reply-To: <20110510154652.GF30996@amd.com>
On Tue, 2011-05-10 at 17:46 +0200, Roedel, Joerg wrote:
>
> I intended to re-use the exlude_hv bit originally, but then I looked
> into how this bit is used. On PPC it looks like this bit is set when
> Linux itself runs as a guest to exclude the hypervisor code being
> profiled. The meaning here is different (beacause Linux itself is the
> hypervisor) and I wanted to avoid different semantics for this bit
> across architectures. So I introduces seperate bits.
> The exclude_hv bit can be used when we have some kind of perf-ctr
> support for KVM guests.
Ah, I didn't mean it like that, yes HV is strictly something different
(and you understood its purpose well, its when the 'host' is a guest
itself). What I was wondering about is if we want HV to be included in
the Guest/Host exclusion mask or not.
Then again, I guess that'll change behaviour in non-obvious ways, so
better not do that.
next prev parent reply other threads:[~2011-05-10 16:06 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
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 [this message]
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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