Re: [PATCH] Remove Powerpc OProfile events the kernel will reject

Hi Carl, Will,

After applying the new patch, I confirmed all of the events accepted by my
POWER8 were enabled and all of the events rejected were disabled.  Thanks!


Rei Odaira

2015-12-16 10:25 GMT-06:00 William Cohen <[email protected]>:

> On 12/16/2015 11:12 AM, Carl E. Love wrote:
> > On Tue, 2015-12-15 at 17:33 -0500, William Cohen wrote:
> >> On 12/14/2015 05:18 PM, Carl E. Love wrote:
> >>> Will, Rei:
> >>>
> >>> As I suspected in the last email, there is a second issue that has to
> do
> >>> with what version of the libpfm library OProfile is using.  Initially a
> >>> subset of the OProfile events for Power 8 were added to libpfm4.5.
> >>> Later the complete set of events was added to libpfm4.6.  So, My first
> >>> attempt at removing the events that perf was rejecting inadvertently
> >>> included events that were in libpfm 4.6 but not libpfm 4.5.  My version
> >>> of oprofile was used a patched version of libpfm 4.4 that effectively
> >>> made it libpfm 4.5.  I redid the patch an verified that when Oprofile
> is
> >>> built with libpfm 4.6 there are no rejected events.  I added a comment
> >>> in the event file as a heads up to this effect.
> >>>
> >>> Please take a look at the patch and see if it works OK for you.  Sorry
> >>> for the delay in getting this out.
> >>>
> >>>            Carl Love
> >
> >> Hi Carl,
> >>
> >> Thanks for the updated patch.  You mentioned patched versions of
> libpfm.  Is this the libpfm in rhel7.  If it is the libpfm in rhel7, are
> there updates that need to be made to the version?
> >>
> >> What environment being used to test?  Any testing on fedora 23 which
> has libpfm-4.6?
> >
> > Will:
> >
> > My system is Ubuntu 14.04.  If you go look
> > in /usr/lib/powerpc64le-linux-gnu/libpfm.so -> libpfm.so.4.4.0 it says
> > 4.4.  I know from working with them that the pulled patches from
> > upstream for the release.  When I tried running a script with all of the
> > events in oprofile, only the events in the 4.5 release succeeded.
> > Unfortunately, I am not up on specifically what packages all of the
> > releases used an how many of the patches were back ported.
> >
> > Unfortunately, I do not have a system with Fedora 23 to test with.  The
> > only testing I could do with libpfm 4.6 was on my Unbuntu 14.04 system
> > where I installed libpfm4.6 then built and installed OProfile using
> > libpfm4.6.  The new version of OProfile was put in /usr/local/bin.  This
> > allowed me to test against the distro installed OProfile and my libpfm
> > 4.6 version on the same machine.
> >
> > It would be nice if we could get some testing on a distro that has 4.6
> > as part of the release.  I expect that my team will probably updating
> > the lab machines early next year and I can then double check then.
> >
> >         Carl Love
> >
>
>
> Thanks for the information, Carl.  RHEL7 had libpfm-4.4 with patch, so
> that was the reason for the question.    There have also been some people
> running fedora 22 on power8 (
> https://bugzilla.redhat.com/show_bug.cgi?id=1290998) which has the
> libpfm-4.4.  They are moving to testing on fedora23 which has libpfm-4.6
>
> There is some information about fedora on ppc64 as secondary architecture
> at https://fedoraproject.org/wiki/Architectures/PowerPC
> Also a page on the f22 ppc64 release at
> https://fedoraproject.org/wiki/PowerPC/F22/Installation
>
> -Will
>

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