Messages in this thread | | | Date | Sat, 5 Jan 2013 02:05:01 +0100 | From | "Steinar H. Gunderson" <> | Subject | Re: PEBS (in perf) stopped working from 3.6 -> 3.7 |
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On Fri, Jan 04, 2013 at 05:16:27PM -0700, David Ahern wrote: > Known problem. Pick one of: update perf to 3.7, add H to the command > (-e cycles:ppH) or apply this patch: > https://lkml.org/lkml/2012/12/28/384
I spoke too soon. This works for cycles, but not for branch-misses:
pannekake:~> sudo perf record -e branch-misses:ppH -a
Error: sys_perf_event_open() syscall returned with 95 (Operation not supported) for event branch-misses:ppH. /bin/dmesg may provide additional information.
No hardware sampling interrupt available. No APIC? If so then you can boot the kernel with the "lapic" boot parameter to force-enable it.
Why would the two be different?
/* Steinar */ -- Homepage: http://www.sesse.net/
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