Public bug reported:
The 2.6.38-1001-linaro-omap kernel reports "unable to reserve pmu" when
attempting to access hw counters using perf:
<snip>
$ uname -a
Linux panda 2.6.38-1001-linaro-omap #2-Ubuntu SMP Mon Mar 21 21:40:07 UTC
2011 armv7l armv7l armv7l GNU/Linux
$ sudo su -c "echo -1 > /proc/sys/kernel/perf_event_paranoid" && cat
/proc/sys/kernel/perf_event_paranoid
-1
$ sudo ./perf stat -e r63 -- sleep 1
No permission to collect stats.
Consider tweaking /proc/sys/kernel/perf_event_paranoid.
$ dmesg | tail -1
[10985.304809] hw perfevents: unable to reserve pmu
$ sudo su -c "strace -e trace=perf_event_open ./perf stat -e r63 -- sleep 1"
perf_event_open(0x1ed338, 0x114c, 0xffffffff, 0xffffffff, 0) = -1 ENODEV (No
such device)
</snip>
The perf_event_open syscall returns ENODEV but the kernel config looks sane to
me:
<snip>
$ grep -i perf_ /boot/config-2.6.38-1001-linaro-omap
# CONFIG_DEBUG_PERF_USE_VMALLOC is not set
CONFIG_HAVE_PERF_EVENTS=y
CONFIG_HW_PERF_EVENTS=y
CONFIG_PERF_COUNTERS=y
CONFIG_PERF_EVENTS=y
CONFIG_PERF_USE_VMALLOC=y
</snip>
** Affects: linux-linaro-omap (Ubuntu)
Importance: Undecided
Status: New
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/744458
Title:
hw perfevents on the pandabaord
--
ubuntu-bugs mailing list
[email protected]
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
