linux-kernel - Re: [RFC] para virt interface of perf to support kvm guest os statistics collection in guest os

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Message-ID: <4C0F5804.9080406@redhat.com>
Date:	Wed, 09 Jun 2010 11:59:48 +0300
From:	Avi Kivity <avi@...hat.com>
To:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
CC:	LKML <linux-kernel@...r.kernel.org>, kvm@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>,
	Fr??d??ric Weisbecker <fweisbec@...il.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	Lin Ming <ming.m.lin@...el.com>,
	Sheng Yang <sheng@...ux.intel.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	oerg Roedel <joro@...tes.org>,
	Jes Sorensen <Jes.Sorensen@...hat.com>,
	Gleb Natapov <gleb@...hat.com>,
	Zachary Amsden <zamsden@...hat.com>, zhiteng.huang@...el.com,
	tim.c.chen@...el.com
Subject: Re: [RFC] para virt interface of perf to support kvm guest os statistics
 collection in guest os

On 06/09/2010 06:30 AM, Zhang, Yanmin wrote:
> From: Zhang, Yanmin<yanmin_zhang@...ux.intel.com>
>
> Based on Ingo's idea, I implement a para virt interface for perf to support
> statistics collection in guest os. That means we could run tool perf in guest
> os directly.
>
> Great thanks to Peter Zijlstra. He is really the architect and gave me architecture
> design suggestions. I also want to thank Yangsheng and LinMing for their generous
> help.
>
> The design is:
>
> 1) Add a kvm_pmu whose callbacks mostly just calls hypercall to vmexit to host kernel;
> 2) Create a host perf_event per guest perf_event;
> 3) Host kernel syncs perf_event count/overflows data changes to guest perf_event
> when processing perf_event overflows after NMI arrives. Host kernel inject NMI to guest
> kernel if a guest event overflows.
> 4) Guest kernel goes through all enabled event on current cpu and output data when they
> overflows.
> 5) No change in user space.
>    

Other issues:

- save/restore support for live migration
- some way to limit the number of open handles (comes automatically with 
the table approach I suggested earlier)

-- 
error compiling committee.c: too many arguments to function

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