* PEBS (in perf) stopped working from 3.6 -> 3.7
@ 2013-01-04 23:47 Steinar H. Gunderson
2013-01-05 0:16 ` David Ahern
0 siblings, 1 reply; 6+ messages in thread
From: Steinar H. Gunderson @ 2013-01-04 23:47 UTC (permalink / raw)
To: linux-kernel
[Please Cc me on any replies; I'm not subscribed to lkml]
Hi,
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.
Non-precise tracing works fine. This used to work in 3.6.5, and I used make
oldconfig (not that I can find any .config settings that would seem relevant
either). I certainly have APIC. There's nothing in dmesg about the error.
I'm using perf built from the same kernel tree (ie., 3.7.1).
This is on a dual Xeon E5520 (ie. Westmere), on a Supermicro board.
/* Steinar */
--
Chief, Tech:Server
http://www.sesse.net/
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: PEBS (in perf) stopped working from 3.6 -> 3.7
2013-01-04 23:47 PEBS (in perf) stopped working from 3.6 -> 3.7 Steinar H. Gunderson
@ 2013-01-05 0:16 ` David Ahern
2013-01-05 0:21 ` Steinar H. Gunderson
2013-01-05 1:05 ` Steinar H. Gunderson
0 siblings, 2 replies; 6+ messages in thread
From: David Ahern @ 2013-01-05 0:16 UTC (permalink / raw)
To: Steinar H. Gunderson; +Cc: linux-kernel
On 1/4/13 4:47 PM, Steinar H. Gunderson wrote:
> [Please Cc me on any replies; I'm not subscribed to lkml]
>
> Hi,
>
> 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
David
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: PEBS (in perf) stopped working from 3.6 -> 3.7
2013-01-05 0:16 ` David Ahern
@ 2013-01-05 0:21 ` Steinar H. Gunderson
2013-01-05 1:05 ` Steinar H. Gunderson
1 sibling, 0 replies; 6+ messages in thread
From: Steinar H. Gunderson @ 2013-01-05 0:21 UTC (permalink / raw)
To: David Ahern; +Cc: linux-kernel
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
Oh, thinking of it, I've actually read about this flamew^Wdiscussion :-)
Thanks!
/* Steinar */
--
Homepage: http://www.sesse.net/
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: PEBS (in perf) stopped working from 3.6 -> 3.7
2013-01-05 0:16 ` David Ahern
2013-01-05 0:21 ` Steinar H. Gunderson
@ 2013-01-05 1:05 ` Steinar H. Gunderson
2013-01-07 3:48 ` David Ahern
1 sibling, 1 reply; 6+ messages in thread
From: Steinar H. Gunderson @ 2013-01-05 1:05 UTC (permalink / raw)
To: David Ahern; +Cc: linux-kernel
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/
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: PEBS (in perf) stopped working from 3.6 -> 3.7
2013-01-05 1:05 ` Steinar H. Gunderson
@ 2013-01-07 3:48 ` David Ahern
2013-01-07 14:40 ` Steinar H. Gunderson
0 siblings, 1 reply; 6+ messages in thread
From: David Ahern @ 2013-01-07 3:48 UTC (permalink / raw)
To: Steinar H. Gunderson; +Cc: linux-kernel
On 1/4/13 6:05 PM, Steinar H. Gunderson wrote:
> 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?
I will make a guess that is processor dependent. On an E5540 with
3.4.11-1.fc16.x86_64, 3.6.10-2.fc16.x86_64, and 3.8 I get the same
failure message.
But on a E5620, it works fine with 3.4 and 3.7 (no intermediate kernels
on that box).
David
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: PEBS (in perf) stopped working from 3.6 -> 3.7
2013-01-07 3:48 ` David Ahern
@ 2013-01-07 14:40 ` Steinar H. Gunderson
0 siblings, 0 replies; 6+ messages in thread
From: Steinar H. Gunderson @ 2013-01-07 14:40 UTC (permalink / raw)
To: David Ahern; +Cc: linux-kernel
On Sun, Jan 06, 2013 at 08:48:36PM -0700, David Ahern wrote:
>> Why would the two be different?
> I will make a guess that is processor dependent. On an E5540 with
> 3.4.11-1.fc16.x86_64, 3.6.10-2.fc16.x86_64, and 3.8 I get the same
> failure message.
>
> But on a E5620, it works fine with 3.4 and 3.7 (no intermediate
> kernels on that box).
That sounds a bit odd; the CPU can certainly do it with 3.6.
/* Steinar */
--
Homepage: http://www.sesse.net/
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2013-01-07 14:40 UTC | newest]
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2013-01-04 23:47 PEBS (in perf) stopped working from 3.6 -> 3.7 Steinar H. Gunderson
2013-01-05 0:16 ` David Ahern
2013-01-05 0:21 ` Steinar H. Gunderson
2013-01-05 1:05 ` Steinar H. Gunderson
2013-01-07 3:48 ` David Ahern
2013-01-07 14:40 ` Steinar H. Gunderson
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