linux-kernel - Re: [PATCH] Enhance perf to collect KVM guest os statistics from host side

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Date:	Tue, 16 Mar 2010 18:07:11 -0500
From:	Anthony Liguori <anthony@...emonkey.ws>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Avi Kivity <avi@...hat.com>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Sheng Yang <sheng@...ux.intel.com>,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	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>, ziteng.huang@...el.com,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Frédéric Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH] Enhance perf to collect KVM guest os statistics from
 host side

On 03/16/2010 12:39 PM, Ingo Molnar wrote:
>> If we look at the use-case, it's going to be something like, a user is
>> creating virtual machines and wants to get performance information about
>> them.
>>
>> Having to run a separate tool like perf is not going to be what they would
>> expect they had to do.  Instead, they would either use their existing GUI
>> tool (like virt-manager) or they would use their management interface
>> (either QMP or libvirt).
>>
>> The complexity of interaction is due to the fact that perf shouldn't be a
>> stand alone tool.  It should be a library or something with a programmatic
>> interface that another tool can make use of.
>>      
> But ... a GUI interface/integration is of course possible too, and it's being
> worked on.
>
> perf is mainly a kernel developer tool, and kernel developers generally dont
> use GUIs to do their stuff: which is the (sole) reason why its first ~850
> commits of tools/perf/ were done without a GUI. We go where our developers
> are.
>
> In any case it's not an excuse to have no proper command-line tooling. In fact
> if you cannot get simpler, more atomic command-line tooling right then you'll
> probably doubly suck at doing a GUI as well.
>    

It's about who owns the user interface.

If qemu owns the user interface, than we can satisfy this in a very 
simple way by adding a perf monitor command.  If we have to support 
third party tools, then it significantly complicates things.

Regards,

Anthony Liguori

> 	Ingo
>    

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