Re: [Perfctr-devel] [ptools-perfapi] New release of libpfm for papi-7.0.1?

[William C. <wc...@re...>]

On 3/15/23 00:25, 'Stephane Eranian' via ptools-perfapi wrote:
> Hi Will,
> 
> 
> On Mon, Mar 13, 2023 at 7:28 PM William Cohen <wc...@re... <mailto:wc...@re...>> wrote:
> 
>     Hi,
> 
>     I was taking a look at putting the new papi-7.0.1 into Fedora rawhide, https://bugzilla.redhat.com/show_bug.cgi?id=2177906 <https://bugzilla.redhat.com/show_bug.cgi?id=2177906> .  Fedora build a separate version of libpfm rpms rather than using the libpfm source bundled with papi.  PAPI-7.0.1 is dependent on the following patch in the libpfm git repo that are not in a released version of libpfm which updates the data struct to match newer kernel.
> 
>     commit 8c606bc2f2d186c2797d9f013283c9150f594f93
>     Author: Masahiko, Yamada <yam...@fu... <mailto:yam...@fu...>>
>     Date:   Tue Sep 20 14:04:31 2022 +0900
> 
>         update perf_event.h to Linux 5.18
> 
>         The perf_events interface for directly accessing PMU registers
>         from userspace for arm64 has been formally implemented in the
>         kernel v5.18.
> 
>         Update perf_event.h header used to build perf_event based examples.
> 
>         Signed-off-by: Masahiko Yamada <yam...@fu... <mailto:yam...@fu...>>
> 
>     Would it be possible to have an updated version of libpfm releasedr?  The alternative would be to build a version of libpfm with the patch in Fedora to allow papi-7.0.1 to build, but having a libpfm with all recent patches would be cleaner.
> 
> I can make a new release but I am not sure I understand why it will solve your problem.
> Thanks.

Hi,

I made a patched version of libpfm in Fedora rawhide for papi-7.0.1 to work around the lack of a release of libpfm with commit 8c606bc2f2d186c2797d9f013283c9150f594f93 (*).  Having a release of libpfm was to make make it easier to describe the requireents for building papi-7.0.1 with an external libpfm library. 

Thanks,

-Will

* libpfm with patch https://koji.fedoraproject.org/koji/buildinfo?buildID=2169815 
  papi-7.0.1 built with that libpfm, https://koji.fedoraproject.org/koji/buildinfo?buildID=2170338
>  
> 
>     Thanks,
> 
>     -Will
> 
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