linux-kernel - Re: [RESEND][PATCH 0/4] Virtual Machine Time Accounting

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Message-ID: <20070910120758.GA26835@elte.hu>
Date:	Mon, 10 Sep 2007 14:07:58 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Laurent Vivier <Laurent.Vivier@...l.net>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [RESEND][PATCH 0/4] Virtual Machine Time Accounting


* Laurent Vivier <Laurent.Vivier@...l.net> wrote:

> Ingo, please, could you have a look to these patches ?
> 
> The aim of these four patches is to introduce Virtual Machine time 
> accounting.
> 
> [PATCH 1/4] as recent CPUs introduce a third running state, after 
> "user" and "system", we need a new field, "guest", in cpustat to store 
> the time used by the CPU to run virtual CPU. Modify /proc/stat to 
> display this new field.

the concept certainly looks sane to me.

The heavy-handed use of #ifdefs uglifies the code to a large degree, but 
this is not a fundamental problem: since basically all distros have KVM 
enabled (and lguest benefits from this too), could you just make all 
this new code unconditional?

	Ingo
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