linux-kernel - Re: [PATCH V4 1/2] perf & kvm: Enhance perf to collect KVM guest os statistics from host side

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Date:	Sat, 17 Apr 2010 21:23:22 +0300
From:	Avi Kivity <avi@...hat.com>
To:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
CC:	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Sheng Yang <sheng@...ux.intel.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	oerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
	Jes Sorensen <Jes.Sorensen@...hat.com>,
	linux-kernel@...r.kernel.org, Zachary Amsden <zamsden@...hat.com>,
	Gleb Natapov <gleb@...hat.com>, tim.c.chen@...el.com,
	zhiteng.huang@...el.com,
	Arnaldo Carvalho de Melo <acme@...radead.org>
Subject: Re: [PATCH V4 1/2] perf & kvm: Enhance perf to collect KVM guest
 os statistics from host side

On 04/16/2010 10:34 AM, Zhang, Yanmin wrote:
> Below is the kernel patch to enable perf to collect guest os statistics.
>
> Joerg,
>
> Would you like to add support on svm? I don't know the exact point to trigger
> NMI to host with svm.
>
> See below code with vmx:
>
> +		kvm_before_handle_nmi(&vmx->vcpu);
>   		asm("int $2");
> +		kvm_after_handle_nmi(&vmx->vcpu);
>
> Signed-off-by: Zhang Yanmin<yanmin_zhang@...ux.intel.com>
>    

Can you please split it further?

Patch 1 introduces perf_register_guest_info_callbacks() and related.  
Ingo can merge this into a branch in tip.git.
Patch 2 is just the kvm bits, I'll apply that after merging the branch 
with patch 1.
Patch 3 adds the tools/perf changes.

This way perf development can continue on tip.git, and kvm development 
can continue on kvm.git, without the code bases diverging and requiring 
a merge later.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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