Ubuntu
linux-ti-omap4 package

  1. Bug #1018092
  2. Comment #11

Comment 11 for bug 1018092

Revision history for this message
Chris Kenna (cjkenna) wrote :

I am wondering the same thing as Joseph (joemp) in the #10 comment. On my Pandaboard, I see that my kernel is configured correctly, and hw perf events come up in dmesg, like so...

$ uname -a
Linux pandaboard01 3.2.0-1419-omap4 #26-Ubuntu SMP PREEMPT Wed Sep 12 14:32:40 UTC 2012 armv7l armv7l armv7l GNU/Linux

$ grep PERF_EVENTS /boot/config-3.2.0-1419-omap4
CONFIG_HAVE_PERF_EVENTS=y
CONFIG_HW_PERF_EVENTS=y
CONFIG_PERF_EVENTS=y

$ dmesg|grep -i perf
[ 0.072387] Initializing cgroup subsys perf_event
[ 0.164306] hw perfevents: enabled with ARMv7 Cortex-A9 PMU driver, 7 counters available

... and yet when I run a `perf stat` command I receive an error:

$ sudo perf stat -e cycles ls /
  Error: open_counter returned with 19 (No such device). /bin/dmesg may provide additional information.

  Fatal: Not all events could be opened.

There is nothing in dmesg.