linux-kernel - Re: [PATCH v2 3/6] KVM-GST: KVM Steal time accounting

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Date:	Mon, 31 Jan 2011 00:45:32 +0800
From:	lidong chen <chen.lidong.kernel@...il.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	Glauber Costa <glommer@...hat.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, aliguori@...ibm.com,
	Rik van Riel <riel@...hat.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v2 3/6] KVM-GST: KVM Steal time accounting

I think we can use performance counter.
use unhalted core cycles event, in the nmi callback funcation, count
which process is running .
if the vm exit is caused by nmi,discard it.
the system time of qemu process is the time steal by kvm.



2011/1/30 Avi Kivity <avi@...hat.com>:
> On 01/28/2011 09:52 PM, Glauber Costa wrote:
>>
>> This patch accounts steal time time in kernel/sched.
>> I kept it from last proposal, because I still see advantages
>> in it: Doing it here will give us easier access from scheduler
>> variables such as the cpu rq. The next patch shows an example of
>> usage for it.
>>
>> Since functions like account_idle_time() can be called from
>> multiple places, not only account_process_tick(), steal time
>> grabbing is repeated in each account function separatedely.
>>
>
> I accept that steal time is worthwhile, but do you have some way to
> demonstrate that the implementation actually works and is beneficial?
>
> Perhaps run two cpu-bound compute processes on one vcpu, overcommit that
> vcpu, and see what happens to the processing rate with and without steal
> time accounting.  I'd expect a fairer response with steal time accounting.
>
> --
> error compiling committee.c: too many arguments to function
>
> --
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