Re: PEBS (in perf) stopped working from 3.6 -> 3.7
From: David Ahern
Date: Fri Jan 04 2013 - 19:16:24 EST
On 1/4/13 4:47 PM, Steinar H. Gunderson wrote:
[Please Cc me on any replies; I'm not subscribed to lkml]
I recently upgraded from 3.6.5 to 3.7.1 to get around some MM issues that
have been bothering me. However, it appears it broke PEBS:
pannekake:/usr/src/linux-3.7.1# perf record -a -e cycles:pp
Error: sys_perf_event_open() syscall returned with 95 (Operation not supported). /bin/dmesg may provide additional information.
Fatal: No hardware sampling interrupt available. No APIC? If so then you can boot the kernel with the "lapic" boot parameter to force-enable it.
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
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