Re: [PATCH v4] perf tools: add support for libpfm4

Re: [PATCH v4] perf tools: add support for libpfm4

[Jiri Olsa]

On Wed, Mar 18, 2020 at 09:11:34PM -0700, Ian Rogers wrote:
> This patch links perf with the libpfm4 library if it is available and
> NO_LIBPFM4 isn't passed to the build. The libpfm4 library contains hardware
> event tables for all processors supported by perf_events. It is a helper
> library that helps convert from a symbolic event name to the event
> encoding required by the underlying kernel interface. This
> library is open-source and available from: http://perfmon2.sf.net.
> 
> With this patch, it is possible to specify full hardware events
> by name. Hardware filters are also supported. Events must be
> specified via the --pfm-events and not -e option. Both options
> are active at the same time and it is possible to mix and match:
> 
> $ perf stat --pfm-events inst_retired:any_p:c=1:i -e cycles ....
> 
> v4 is a rebase on git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git
>    branch perf/core and re-adds the tools/build/feature/test-libpfm4.c
>    missed in v3.

ugh.. I might have waited too long, but I can't apply it
anymore on Arnaldo's perf/core, sorry

jirka

Re: [PATCH v4] perf tools: add support for libpfm4

[Ian Rogers]

On Mon, Mar 23, 2020 at 3:57 AM Jiri Olsa <jolsa@redhat.com> wrote:
>
> On Wed, Mar 18, 2020 at 09:11:34PM -0700, Ian Rogers wrote:
> > This patch links perf with the libpfm4 library if it is available and
> > NO_LIBPFM4 isn't passed to the build. The libpfm4 library contains hardware
> > event tables for all processors supported by perf_events. It is a helper
> > library that helps convert from a symbolic event name to the event
> > encoding required by the underlying kernel interface. This
> > library is open-source and available from: http://perfmon2.sf.net.
> >
> > With this patch, it is possible to specify full hardware events
> > by name. Hardware filters are also supported. Events must be
> > specified via the --pfm-events and not -e option. Both options
> > are active at the same time and it is possible to mix and match:
> >
> > $ perf stat --pfm-events inst_retired:any_p:c=1:i -e cycles ....
> >
> > v4 is a rebase on git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git
> >    branch perf/core and re-adds the tools/build/feature/test-libpfm4.c
> >    missed in v3.
>
> ugh.. I might have waited too long, but I can't apply it
> anymore on Arnaldo's perf/core, sorry
>
> jirka

No worries, rebase here:
https://lkml.org/lkml/2020/3/23/1054

Thanks!
Ian