ARM Cortex-A9 (SMP) is currently unsupported by OProfile

[Will Deacon]

Binary package hint: oprofile

Hello,

OProfile on ARM currently doesn't support the Cortex-A9 platform. With the 2.6.35 release of the Linux Kernel,
the OProfile backend for the Cortex-A9 will be available. The userspace patches to make use of this new feature
are available on the OProfile mailing list at:

http://marc.info/?l=oprofile-list&m=127411918506283&w=2

Since Maverick is targeting 2.6.35, Loic Minier (lool) suggested I report
this `bug' so that the userspace support can be enabled for ARM.

Thanks!

Will

[Will Deacon (will-deacon)]

Linked to from: https://blueprints.launchpad.net/ubuntu/+spec/arm-m-debugging-with-oprofile

[Launchpad Janitor (janitor)]

This bug was fixed in the package oprofile - 0.9.6-1ubuntu8

---------------
oprofile (0.9.6-1ubuntu8) maverick; urgency=low

  * New patches, ARMv7 cleanup and Cortex-A9 support, backported from
    http://article.gmane.org/gmane.linux.oprofile/8563; LP: #591862.
    - arm-factor-out-armv7-common-architectural-events
    - arm-correct-usage-of-core-technology-for-v7-and-mpcore
    - arm-add-support-for-cortex-a9-events
 -- Loic Minier <email address hidden> Thu, 17 Jun 2010 13:10:23 +0200

[Loïc Minier (lool)]

(For my own reference, thread on gmane at http://article.gmane.org/gmane.linux.oprofile/8563 which I find slightly easier to read)

Will, I see this got positive comments on the list but nobody said they would merge it and I don't see it in today's CVS. I'm not familiar with the oprofile upstream development process, but the oprofile website points at their bug tracker, so you might want to file a bug at http://sourceforge.net/tracker/?group_id=16191&atid=116191 to make sure your patches land upstream.

[Loïc Minier (lool)]

Also, would you mind testing the resulting oprofile binaries on armel when you get the chance? I had to adapt the patch adding Cortex-A9 CPU slightly, but I don't expect regressions from this particular change, just seems a good idea to test the final Ubuntu binaries.

Thanks!

[Loïc Minier (lool)]

(If you report an upstream bug, feel free to link it here, either in a comment or adding an "upstream" task to this bug with the "Also affects" button; thanks!)

[haohui (ricetons)]

Does it work on the marvick release?

I tried these packages and they required an out of dated version of binutils.

[Loïc Minier (lool)]

Will, did the userspace patches get merged upstream by any chance?

[Will Deacon (will-deacon)]

On Fri, Jul 08, 2011 at 09:50:39AM +0100, Loïc Minier wrote:
> Will, did the userspace patches get merged upstream by any chance?

Yes, although they haven't made a release for a couple of years now, so
you'll need to get the latest version via git.

One of the patches is here:

http://oprofile.git.sourceforge.net/git/gitweb.cgi?p=oprofile/oprofile;a=commit;h=57c2f7bf1dcc79e08ca5e0d1216b8b0499dfbaab

Unfortunately, they don't seem to preserve authorship in their repo :(

Will

[Loïc Minier (lool)]

Thanks for confirming!

[Kyler Zhang (zachary6626)]

I can not running oprofile normally on OMAP4460.
The PMU interrupt enable register always be changed by any process.