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List:       oprofile-list
Subject:    Re: profile kernel in KVM virtual PC?
From:       Radim Roska <radim.roska () gmail ! com>
Date:       2009-12-21 12:19:15
Message-ID: aa3710a80912210419p3c6aba2n9f711a9903d4cdff () mail ! gmail ! com
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hello,

thanks for answer..I've tried it but without success...i tried just
for fun also virtualbox but same result - no result :).

radim

On Mon, Dec 14, 2009 at 11:30 PM, William Cohen <wcohen@nc.rr.com> wrote:
> On 12/07/2009 11:34 AM, Radim Roska wrote:
>> Hi,
>>
>> im running kernel I'm playing with in a debian which runs as Virtual PC
>> under KVM.
>>
>> I need to profile kernel in detail. I though OProfile could be simplest
>> solution. But im not getting any data.
>>
>> Is it possible to profile kernel in KVM? If not what option would you
>> recommend? :) I need something i can quickly use and get data because im
>> already behind schedule:). Other choices are probably gcov or systemtap
>> right?
>>
>> Thanks,
>>
>> --
>> Radim Roška
>
> You might be able to force oprofile to use the timer mechanism in the
> virtualized environment. Running a short script like this as root:
>
> #!/bin/sh
> #
> # Short script force timer mode
> opcontrol --deinit
> /sbin/modprobe oprofile timer=1
> opcontrol --init
>
> This script will force oprofile to use the timer fallback mechanism rather than
> attempting to use the hardware performance counters. Then you should be able
> collect time based samples using it.
>
> -Will
>
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-- 
Radim Roška

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