Hi Stephane,
I'm attempting to look at the ovfl_intr_replay_count entry, which should 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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