* Re: [PATCH v11 0/4] perf tools: add support for libpfm4
[not found] <20200416221457.46710-1-irogers@google.com>
@ 2020-04-17 9:08 ` Jiri Olsa
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From: Jiri Olsa @ 2020-04-17 9:08 UTC (permalink / raw)
To: Ian Rogers
Cc: Peter Zijlstra, Ingo Molnar, Arnaldo Carvalho de Melo,
Mark Rutland, Alexander Shishkin, Namhyung Kim,
Alexei Starovoitov, Daniel Borkmann, Martin KaFai Lau,
Yonghong Song, Andrii Nakryiko, Greg Kroah-Hartman,
Thomas Gleixner, Igor Lubashev, Alexey Budankov, Florian Fainelli,
Adrian Hunter, Andi Kleen, Jiwei Sun, yuzhouji
On Thu, Apr 16, 2020 at 03:14:53PM -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 ....
>
> v11 reformats the perf list output to be:
> List of pre-defined events (to be used in -e):
>
> branch-instructions OR branches [Hardware event]
> branch-misses [Hardware event]
> ...
>
> List of pre-defined events (to be used in --pfm-events):
>
> ix86arch:
> UNHALTED_CORE_CYCLES
> [count core clock cycles whenever the clock signal on the specific core is running (not halted)]
> INSTRUCTION_RETIRED
> [count the number of instructions at retirement. For instructions that consists of multiple mic>
> ...
> skx:
> UNHALTED_CORE_CYCLES
> [Count core clock cycles whenever the clock signal on the specific core is running (not halted)]
> ...
> BACLEARS
> [Branch re-steered]
> BACLEARS:ANY
> [Number of front-end re-steers due to BPU misprediction]
> ...
Acked-by: Jiri Olsa <jolsa@redhat.com>
thanks,
jirka
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