Re: [PATCH v9 4/4] perf tools: add support for libpfm4

From: Jiri Olsa
Date: Thu Apr 16 2020 - 05:55:31 EST


On Wed, Apr 15, 2020 at 11:35:51PM -0700, Ian Rogers wrote:
> From: Stephane Eranian <eranian@xxxxxxxxxx>
>
> 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 ....
>
> Signed-off-by: Stephane Eranian <eranian@xxxxxxxxxx>
> Reviewed-by: Ian Rogers <irogers@xxxxxxxxxx>

# perf list
...
perf_raw pfm-events
r0000
[perf_events raw event syntax: r[0-9a-fA-F]+]

skl pfm-events
UNHALTED_CORE_CYCLES
[Count core clock cycles whenever the clock signal on the specific core is running (not halted)]
UNHALTED_REFERENCE_CYCLES

please add ':' behind the '* pfm-events' label

jirka