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Message-ID: <4BA00F1F.1090907@codemonkey.ws>
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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