Re: couldn't get kernel profiling data from OProfile

[Kirill K. <kir...@gm...>]

the same

kkuvaldin@002:~% sudo opreport -l image:'*vmlinux*'
error: no sample files found: profile specification too strict ?


It looks as if either I misunderstand some fundamental concepts of how
oprofile gathers its results or there is a subtle error in my version
of oprofile/kernel module/whatever...


Kirill

On Mon, Mar 10, 2008 at 2:44 PM, Montheu, Lionel
<Lio...@nd...> wrote:
> Can you try the following command:
>  sudo opreport -l image:*vmlinux*
>
>  -----Ursprüngliche Nachricht-----
>  Von: opr...@li... [mailto:opr...@li...] Im Auftrag von Kirill Kuvaldin
>  Gesendet: Montag, 10. März 2008 10:48
>  An: opr...@li...; lin...@vg...
>  Betreff: couldn't get kernel profiling data from OProfile
>
>
>
>  Hi,
>
>  I'm using oprofile 0.9.3 on Debian Lenny, kernel 2.6.22 SMP x86_64.
>
>  The problem I'm dealing with is that opreport couldn't provide profiling data for the kernel image.
>
>  I start the profiler as follows, specifying the vmlinux image:
>
>  kkuvaldin@002:oprofile% sudo opcontrol --vmlinux=/boot/vmlinux kkuvaldin@002:oprofile% sudo opcontrol --start Using default event: CPU_CLK_UNHALTED:100000:0:1:1 Using 2.6+ OProfile kernel interface.
>  Reading module info.
>  Using log file /var/lib/oprofile/samples/oprofiled.log
>  Daemon started.
>  Profiler running.
>
>  Then I did some workload to make sure oprofile gets enough samples:
>
>  kkuvaldin@002:oprofile% dd if=/dev/urandom of=/dev/null
>  80870+0 records in
>  80869+0 records out
>  41404928 bytes (41 MB) copied, 6.04975 seconds, 6.8 MB/s
>
>  kkuvaldin@002:oprofile% sudo opcontrol --stop Stopping profiling.
>
>  However when I tried to get some profiling data for the kernel binary, I ended up with the following:
>
>  kkuvaldin@002:oprofile% sudo opreport -l /boot/vmlinux
>  error: no sample files found: profile specification too strict ?
>  zsh: exit 1     sudo opreport -l /boot/vmlinux
>
>
>  I double checked that /boot/vmlinux is the exact image that was running on the system.
>
>
>  Any ideas why oprofile doesn't list samples for the vmlinux image?
>
>
>
>  Thanks,
>  Kirill
>
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