Ah, ok, thanks. The files in the Documentation subdir are still showing the old location, which helped to confuse me.
Regards.
- Corey
Corey Ashford
Software Engineer
IBM Linux Technology Center, Linux Toolchain
Beaverton, OR
503-578-3507
[EMAIL PROTECTED]
"stephane eranian" <[EMAIL PROTECTED]> wrote on 05/02/2008 11:22:25 PM:
> Corey,
>
> Since 2.6.24, perfmon statistics are not under /sys anymore. They are
> implemented via debugfs.
> You need to mount a debugfs filesystem: mount -tdebugfs none /debugfs.
> You'll have a perfmon
> subdir in there.
>
>
> On Sat, May 3, 2008 at 2:00 AM, Corey J Ashford <[EMAIL PROTECTED]> wrote:
> >
> >
> > Hi Stephane,
> >
> > I'm attempting to look at the ovfl_intr_replay_count entry, whichshould be
> > in /sys/devices/cpu/cpuXX/perfmon/ovfl_replay_count right?
> > Well, I don't see a 'perfmon' subdirectory of any
> > /sys/devices/system/cpu/cpuXX directory, and this is after successfully
> > running a number of PAPI (on perfmon2) tests.
> > Do these entries need to be enabled somehow? What am I missing?
> >
> > Thanks,
> >
> > - Corey
> >
> > Corey Ashford
> > Software Engineer
> > IBM Linux Technology Center, Linux Toolchain
> > Beaverton, OR
> > 503-578-3507
> > [EMAIL PROTECTED]
> >
> >
> > [EMAIL PROTECTED] wrote on 04/25/2008 12:55:36
> > PM:
> >
> > > Hello everyone,
> > [snip]
> >
> > > Thus, I believe they are subject the problem. It can easily be detected
> > if you
> > > look at the statistics maintained by perfmon via debugfs. Perfmon
> > maintains
> > > the number of times you had to replay in the ovfl_intr_replay_count
> > entry.
> > > If you see a value different than zero then it means you needed replay
> > > capability. To trigger this condition you can pin multiple self-
> > > sampling threads
> > > onto the same core and have monitoring run at kernel+user+force a lot of
> > > context switches.
> > [snip]
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