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    perf tools: Add optional support for libpfm4 · 70943490
    Stephane Eranian authored
    This patch links perf with the libpfm4 library if it is available and
    LIBPFM4 is 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 ....
    
    One needs to explicitely ask for its inclusion by using the LIBPFM4 make
    command line option, ie its opt-in rather than opt-out of feature
    detection and build support.
    
    Signed-off-by: default avatarStephane Eranian <eranian@google.com>
    Reviewed-by: default avatarIan Rogers <irogers@google.com>
    Cc: Adrian Hunter <adrian.hunter@intel.com>
    Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
    Cc: Alexei Starovoitov <ast@kernel.org>
    Cc: Alexey Budankov <alexey.budankov@linux.intel.com>
    Cc: Andi Kleen <ak@linux.intel.com>
    Cc: Andrii Nakryiko <andriin@fb.com>
    Cc: Daniel Borkmann <daniel@iogearbox.net>
    Cc: Florian Fainelli <f.fainelli@gmail.com>
    Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    Cc: Igor Lubashev <ilubashe@akamai.com>
    Cc: Jin Yao <yao.jin@linux.intel.com>
    Cc: Jiri Olsa <jolsa@redhat.com>
    Cc: Jiwei Sun <jiwei.sun@windriver.com>
    Cc: John Garry <john.garry@huawei.com>
    Cc: Kan Liang <kan.liang@linux.intel.com>
    Cc: Leo Yan <leo.yan@linaro.org>
    Cc: Mark Rutland <mark.rutland@arm.com>
    Cc: Martin KaFai Lau <kafai@fb.com>
    Cc: Namhyung Kim <namhyung@kernel.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Yonghong Song <yhs@fb.com>
    Cc: bpf@vger.kernel.org
    Cc: netdev@vger.kernel.org
    Cc: yuzhoujian <yuzhoujian@didichuxing.com>
    Link: http://lore.kernel.org/lkml/20200505182943.218248-2-irogers@google.com
    
    
    Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    70943490