Date:   Tue, 29 Aug 2023 08:34:25 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     James Clark <james.clark@....com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        John Garry <john.g.garry@...cle.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        Jing Zhang <renyu.zj@...ux.alibaba.com>,
        Ravi Bangoria <ravi.bangoria@....com>,
        Rob Herring <robh@...nel.org>,
        Gaosheng Cui <cuigaosheng1@...wei.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 04/18] perf jevents: Group events by PMU

On Tue, Aug 29, 2023 at 8:28 AM James Clark <james.clark@....com> wrote:
>
>
>
> On 24/08/2023 05:13, Ian Rogers wrote:
> > Prior to this change a cpuid would map to a list of events where the
> > PMU would be encoded alongside the event information. This change
> > breaks apart each group of events so that there is a group per PMU. A
> > new table is added with the PMU's name and the list of events, the
> > original table now holding an array of these per PMU tables.
> >
> > These changes are to make it easier to get per PMU information about
> > events, rather than the current approach of scanning all events. The
> > perf binary size with BPF skeletons on x86 is reduced by about 1%. The
> > unidentified PMU is now always expanded to "cpu".
> >
>
> Hi Ian,
>
> I noticed that after this commit in perf-tools-next, events and
> descriptions aren't printed by perf list anymore (on Arm). Only the
> metrics and builtin kernel events are printed.
>
> I'm not sure if this is something that's related to test failure that
> Arnaldo mentioned on the cover letter, or something else.
>
> I didn't look into the root cause yet, just thought I would mention it
> first.


Hi James,

There was a glitch in this patch assuming json events with no PMU were
defaulting to CPU, something that happens a lot in the perf code. The
later patch:
https://lore.kernel.org/lkml/20230826062203.1058041-1-irogers@google.com/
is supposed to address this.

Thanks,
Ian

> Thanks
> James
>
> > Signed-off-by: Ian Rogers <irogers@...gle.com>
> > ---
> >  tools/perf/pmu-events/jevents.py | 181 +++++++++++++++++++++++--------
> >  tools/perf/tests/pmu-events.c    |  30 +++--
> >  2 files changed, 154 insertions(+), 57 deletions(-)
> >
> > diff --git a/tools/perf/pmu-events/jevents.py b/tools/perf/pmu-events/jevents.py
> > index aae5334099b1..1ad20140114c 100755
> > --- a/tools/perf/pmu-events/jevents.py
> > +++ b/tools/perf/pmu-events/jevents.py
> > @@ -42,7 +42,7 @@ _metricgroups = {}
> >  # Order specific JsonEvent attributes will be visited.
> >  _json_event_attributes = [
> >      # cmp_sevent related attributes.
> > -    'name', 'pmu', 'topic', 'desc',
> > +    'name', 'topic', 'desc',
> >      # Seems useful, put it early.
> >      'event',
> >      # Short things in alphabetical order.
> > @@ -53,7 +53,7 @@ _json_event_attributes = [
> >
> >  # Attributes that are in pmu_metric rather than pmu_event.
> >  _json_metric_attributes = [
> > -    'pmu', 'metric_name', 'metric_group', 'metric_expr', 'metric_threshold',
> > +    'metric_name', 'metric_group', 'metric_expr', 'metric_threshold',
> >      'desc', 'long_desc', 'unit', 'compat', 'metricgroup_no_group',
> >      'default_metricgroup_name', 'aggr_mode', 'event_grouping'
> >  ]
> > @@ -252,7 +252,7 @@ class JsonEvent:
> >      def unit_to_pmu(unit: str) -> Optional[str]:
> >        """Convert a JSON Unit to Linux PMU name."""
> >        if not unit:
> > -        return None
> > +        return 'cpu'
> >        # Comment brought over from jevents.c:
> >        # it's not realistic to keep adding these, we need something more scalable ...
> >        table = {
> > @@ -343,10 +343,13 @@ class JsonEvent:
> >        self.desc += extra_desc
> >      if self.long_desc and extra_desc:
> >        self.long_desc += extra_desc
> > -    if self.pmu:
> > -      if self.desc and not self.desc.endswith('. '):
> > -        self.desc += '. '
> > -      self.desc = (self.desc if self.desc else '') + ('Unit: ' + self.pmu + ' ')
> > +    if self.pmu and self.pmu != 'cpu':
> > +      if not self.desc:
> > +        self.desc = 'Unit: ' + self.pmu
> > +      else:
> > +        if not self.desc.endswith('. '):
> > +          self.desc += '. '
> > +      self.desc += 'Unit: ' + self.pmu
> >      if arch_std:
> >        if arch_std.lower() in _arch_std_events:
> >          event = _arch_std_events[arch_std.lower()].event
> > @@ -437,13 +440,13 @@ def add_events_table_entries(item: os.DirEntry, topic: str) -> None:
> >  def print_pending_events() -> None:
> >    """Optionally close events table."""
> >
> > -  def event_cmp_key(j: JsonEvent) -> Tuple[bool, str, str, str, str]:
> > +  def event_cmp_key(j: JsonEvent) -> Tuple[str, str, bool, str, str]:
> >      def fix_none(s: Optional[str]) -> str:
> >        if s is None:
> >          return ''
> >        return s
> >
> > -    return (j.desc is not None, fix_none(j.topic), fix_none(j.name), fix_none(j.pmu),
> > +    return (fix_none(j.pmu).replace(',','_'), fix_none(j.name), j.desc is not None, fix_none(j.topic),
> >              fix_none(j.metric_name))
> >
> >    global _pending_events
> > @@ -458,13 +461,36 @@ def print_pending_events() -> None:
> >      global event_tables
> >      _event_tables.append(_pending_events_tblname)
> >
> > -  _args.output_file.write(
> > -      f'static const struct compact_pmu_event {_pending_events_tblname}[] = {{\n')
> > -
> > +  first = True
> > +  last_pmu = None
> > +  pmus = set()
> >    for event in sorted(_pending_events, key=event_cmp_key):
> > +    if event.pmu != last_pmu:
> > +      if not first:
> > +        _args.output_file.write('};\n')
> > +      pmu_name = event.pmu.replace(',', '_')
> > +      _args.output_file.write(
> > +          f'static const struct compact_pmu_event {_pending_events_tblname}_{pmu_name}[] = {{\n')
> > +      first = False
> > +      last_pmu = event.pmu
> > +      pmus.add((event.pmu, pmu_name))
> > +
> >      _args.output_file.write(event.to_c_string(metric=False))
> >    _pending_events = []
> >
> > +  _args.output_file.write(f"""
> > +}};
> > +
> > +const struct pmu_table_entry {_pending_events_tblname}[] = {{
> > +""")
> > +  for (pmu, tbl_pmu) in sorted(pmus):
> > +    pmu_name = f"{pmu}\\000"
> > +    _args.output_file.write(f"""{{
> > +     .entries = {_pending_events_tblname}_{tbl_pmu},
> > +     .num_entries = ARRAY_SIZE({_pending_events_tblname}_{tbl_pmu}),
> > +     .pmu_name = {{ {_bcs.offsets[pmu_name]} /* {pmu_name} */ }},
> > +}},
> > +""")
> >    _args.output_file.write('};\n\n')
> >
> >  def print_pending_metrics() -> None:
> > @@ -490,13 +516,36 @@ def print_pending_metrics() -> None:
> >      global metric_tables
> >      _metric_tables.append(_pending_metrics_tblname)
> >
> > -  _args.output_file.write(
> > -      f'static const struct compact_pmu_event {_pending_metrics_tblname}[] = {{\n')
> > -
> > +  first = True
> > +  last_pmu = None
> > +  pmus = set()
> >    for metric in sorted(_pending_metrics, key=metric_cmp_key):
> > +    if metric.pmu != last_pmu:
> > +      if not first:
> > +        _args.output_file.write('};\n')
> > +      pmu_name = metric.pmu.replace(',', '_')
> > +      _args.output_file.write(
> > +          f'static const struct compact_pmu_event {_pending_metrics_tblname}_{pmu_name}[] = {{\n')
> > +      first = False
> > +      last_pmu = metric.pmu
> > +      pmus.add((metric.pmu, pmu_name))
> > +
> >      _args.output_file.write(metric.to_c_string(metric=True))
> >    _pending_metrics = []
> >
> > +  _args.output_file.write(f"""
> > +}};
> > +
> > +const struct pmu_table_entry {_pending_metrics_tblname}[] = {{
> > +""")
> > +  for (pmu, tbl_pmu) in sorted(pmus):
> > +    pmu_name = f"{pmu}\\000"
> > +    _args.output_file.write(f"""{{
> > +     .entries = {_pending_metrics_tblname}_{tbl_pmu},
> > +     .num_entries = ARRAY_SIZE({_pending_metrics_tblname}_{tbl_pmu}),
> > +     .pmu_name = {{ {_bcs.offsets[pmu_name]} /* {pmu_name} */ }},
> > +}},
> > +""")
> >    _args.output_file.write('};\n\n')
> >
> >  def get_topic(topic: str) -> str:
> > @@ -532,6 +581,8 @@ def preprocess_one_file(parents: Sequence[str], item: os.DirEntry) -> None:
> >
> >    topic = get_topic(item.name)
> >    for event in read_json_events(item.path, topic):
> > +    pmu_name = f"{event.pmu}\\000"
> > +    _bcs.add(pmu_name)
> >      if event.name:
> >        _bcs.add(event.build_c_string(metric=False))
> >      if event.metric_name:
> > @@ -577,14 +628,14 @@ def print_mapping_table(archs: Sequence[str]) -> None:
> >    _args.output_file.write("""
> >  /* Struct used to make the PMU event table implementation opaque to callers. */
> >  struct pmu_events_table {
> > -        const struct compact_pmu_event *entries;
> > -        size_t length;
> > +        const struct pmu_table_entry *pmus;
> > +        uint32_t num_pmus;
> >  };
> >
> >  /* Struct used to make the PMU metric table implementation opaque to callers. */
> >  struct pmu_metrics_table {
> > -        const struct compact_pmu_event *entries;
> > -        size_t length;
> > +        const struct pmu_table_entry *pmus;
> > +        uint32_t num_pmus;
> >  };
> >
> >  /*
> > @@ -614,12 +665,12 @@ const struct pmu_events_map pmu_events_map[] = {
> >  \t.arch = "testarch",
> >  \t.cpuid = "testcpu",
> >  \t.event_table = {
> > -\t\t.entries = pmu_events__test_soc_cpu,
> > -\t\t.length = ARRAY_SIZE(pmu_events__test_soc_cpu),
> > +\t\t.pmus = pmu_events__test_soc_cpu,
> > +\t\t.num_pmus = ARRAY_SIZE(pmu_events__test_soc_cpu),
> >  \t},
> >  \t.metric_table = {
> > -\t\t.entries = pmu_metrics__test_soc_cpu,
> > -\t\t.length = ARRAY_SIZE(pmu_metrics__test_soc_cpu),
> > +\t\t.pmus = pmu_metrics__test_soc_cpu,
> > +\t\t.num_pmus = ARRAY_SIZE(pmu_metrics__test_soc_cpu),
> >  \t}
> >  },
> >  """)
> > @@ -649,12 +700,12 @@ const struct pmu_events_map pmu_events_map[] = {
> >  \t.arch = "{arch}",
> >  \t.cpuid = "{cpuid}",
> >  \t.event_table = {{
> > -\t\t.entries = {event_tblname},
> > -\t\t.length = {event_size}
> > +\t\t.pmus = {event_tblname},
> > +\t\t.num_pmus = {event_size}
> >  \t}},
> >  \t.metric_table = {{
> > -\t\t.entries = {metric_tblname},
> > -\t\t.length = {metric_size}
> > +\t\t.pmus = {metric_tblname},
> > +\t\t.num_pmus = {metric_size}
> >  \t}}
> >  }},
> >  """)
> > @@ -685,15 +736,15 @@ static const struct pmu_sys_events pmu_sys_event_tables[] = {
> >    for tblname in _sys_event_tables:
> >      _args.output_file.write(f"""\t{{
> >  \t\t.event_table = {{
> > -\t\t\t.entries = {tblname},
> > -\t\t\t.length = ARRAY_SIZE({tblname})
> > +\t\t\t.pmus = {tblname},
> > +\t\t\t.num_pmus = ARRAY_SIZE({tblname})
> >  \t\t}},""")
> >      metric_tblname = _sys_event_table_to_metric_table_mapping[tblname]
> >      if metric_tblname in _sys_metric_tables:
> >        _args.output_file.write(f"""
> >  \t\t.metric_table = {{
> > -\t\t\t.entries = {metric_tblname},
> > -\t\t\t.length = ARRAY_SIZE({metric_tblname})
> > +\t\t\t.pmus = {metric_tblname},
> > +\t\t\t.num_pmus = ARRAY_SIZE({metric_tblname})
> >  \t\t}},""")
> >        printed_metric_tables.append(metric_tblname)
> >      _args.output_file.write(f"""
> > @@ -753,18 +804,56 @@ static void decompress_metric(int offset, struct pmu_metric *pm)
> >        _args.output_file.write('\twhile (*p++);')
> >    _args.output_file.write("""}
> >
> > +static int pmu_events_table__for_each_event_pmu(const struct pmu_events_table *table,
> > +                                                const struct pmu_table_entry *pmu,
> > +                                                pmu_event_iter_fn fn,
> > +                                                void *data)
> > +{
> > +        int ret;
> > +        struct pmu_event pe = {
> > +                .pmu = &big_c_string[pmu->pmu_name.offset],
> > +        };
> > +
> > +        for (uint32_t i = 0; i < pmu->num_entries; i++) {
> > +                decompress_event(pmu->entries[i].offset, &pe);
> > +                if (!pe.name)
> > +                        continue;
> > +                ret = fn(&pe, table, data);
> > +                if (ret)
> > +                        return ret;
> > +        }
> > +        return 0;
> > + }
> > +
> >  int pmu_events_table__for_each_event(const struct pmu_events_table *table,
> >                                      pmu_event_iter_fn fn,
> >                                      void *data)
> >  {
> > -        for (size_t i = 0; i < table->length; i++) {
> > -                struct pmu_event pe;
> > -                int ret;
> > +        for (size_t i = 0; i < table->num_pmus; i++) {
> > +                int ret = pmu_events_table__for_each_event_pmu(table, &table->pmus[i],
> > +                                                               fn, data);
> >
> > -                decompress_event(table->entries[i].offset, &pe);
> > -                if (!pe.name)
> > +                if (ret)
> > +                        return ret;
> > +        }
> > +        return 0;
> > +}
> > +
> > +static int pmu_metrics_table__for_each_metric_pmu(const struct pmu_metrics_table *table,
> > +                                                const struct pmu_table_entry *pmu,
> > +                                                pmu_metric_iter_fn fn,
> > +                                                void *data)
> > +{
> > +        int ret;
> > +        struct pmu_metric pm = {
> > +                .pmu = &big_c_string[pmu->pmu_name.offset],
> > +        };
> > +
> > +        for (uint32_t i = 0; i < pmu->num_entries; i++) {
> > +                decompress_metric(pmu->entries[i].offset, &pm);
> > +                if (!pm.metric_expr)
> >                          continue;
> > -                ret = fn(&pe, table, data);
> > +                ret = fn(&pm, table, data);
> >                  if (ret)
> >                          return ret;
> >          }
> > @@ -775,14 +864,10 @@ int pmu_metrics_table__for_each_metric(const struct pmu_metrics_table *table,
> >                                       pmu_metric_iter_fn fn,
> >                                       void *data)
> >  {
> > -        for (size_t i = 0; i < table->length; i++) {
> > -                struct pmu_metric pm;
> > -                int ret;
> > +        for (size_t i = 0; i < table->num_pmus; i++) {
> > +                int ret = pmu_metrics_table__for_each_metric_pmu(table, &table->pmus[i],
> > +                                                                 fn, data);
> >
> > -                decompress_metric(table->entries[i].offset, &pm);
> > -                if (!pm.metric_expr)
> > -                        continue;
> > -                ret = fn(&pm, table, data);
> >                  if (ret)
> >                          return ret;
> >          }
> > @@ -1010,7 +1095,13 @@ such as "arm/cortex-a34".''',
> >  #include <stddef.h>
> >
> >  struct compact_pmu_event {
> > -  int offset;
> > +        int offset;
> > +};
> > +
> > +struct pmu_table_entry {
> > +        const struct compact_pmu_event *entries;
> > +        uint32_t num_entries;
> > +        struct compact_pmu_event pmu_name;
> >  };
> >
> >  """)
> > diff --git a/tools/perf/tests/pmu-events.c b/tools/perf/tests/pmu-events.c
> > index 5f541eadc088..0b6efabc3d20 100644
> > --- a/tools/perf/tests/pmu-events.c
> > +++ b/tools/perf/tests/pmu-events.c
> > @@ -44,6 +44,7 @@ struct perf_pmu_test_pmu {
> >
> >  static const struct perf_pmu_test_event bp_l1_btb_correct = {
> >       .event = {
> > +             .pmu = "cpu",
> >               .name = "bp_l1_btb_correct",
> >               .event = "event=0x8a",
> >               .desc = "L1 BTB Correction",
> > @@ -55,6 +56,7 @@ static const struct perf_pmu_test_event bp_l1_btb_correct = {
> >
> >  static const struct perf_pmu_test_event bp_l2_btb_correct = {
> >       .event = {
> > +             .pmu = "cpu",
> >               .name = "bp_l2_btb_correct",
> >               .event = "event=0x8b",
> >               .desc = "L2 BTB Correction",
> > @@ -66,6 +68,7 @@ static const struct perf_pmu_test_event bp_l2_btb_correct = {
> >
> >  static const struct perf_pmu_test_event segment_reg_loads_any = {
> >       .event = {
> > +             .pmu = "cpu",
> >               .name = "segment_reg_loads.any",
> >               .event = "event=0x6,period=200000,umask=0x80",
> >               .desc = "Number of segment register loads",
> > @@ -77,6 +80,7 @@ static const struct perf_pmu_test_event segment_reg_loads_any = {
> >
> >  static const struct perf_pmu_test_event dispatch_blocked_any = {
> >       .event = {
> > +             .pmu = "cpu",
> >               .name = "dispatch_blocked.any",
> >               .event = "event=0x9,period=200000,umask=0x20",
> >               .desc = "Memory cluster signals to block micro-op dispatch for any reason",
> > @@ -88,6 +92,7 @@ static const struct perf_pmu_test_event dispatch_blocked_any = {
> >
> >  static const struct perf_pmu_test_event eist_trans = {
> >       .event = {
> > +             .pmu = "cpu",
> >               .name = "eist_trans",
> >               .event = "event=0x3a,period=200000,umask=0x0",
> >               .desc = "Number of Enhanced Intel SpeedStep(R) Technology (EIST) transitions",
> > @@ -99,6 +104,7 @@ static const struct perf_pmu_test_event eist_trans = {
> >
> >  static const struct perf_pmu_test_event l3_cache_rd = {
> >       .event = {
> > +             .pmu = "cpu",
> >               .name = "l3_cache_rd",
> >               .event = "event=0x40",
> >               .desc = "L3 cache access, read",
> > @@ -123,7 +129,7 @@ static const struct perf_pmu_test_event uncore_hisi_ddrc_flux_wcmd = {
> >       .event = {
> >               .name = "uncore_hisi_ddrc.flux_wcmd",
> >               .event = "event=0x2",
> > -             .desc = "DDRC write commands. Unit: hisi_sccl,ddrc ",
> > +             .desc = "DDRC write commands. Unit: hisi_sccl,ddrc",
> >               .topic = "uncore",
> >               .long_desc = "DDRC write commands",
> >               .pmu = "hisi_sccl,ddrc",
> > @@ -137,7 +143,7 @@ static const struct perf_pmu_test_event unc_cbo_xsnp_response_miss_eviction = {
> >       .event = {
> >               .name = "unc_cbo_xsnp_response.miss_eviction",
> >               .event = "event=0x22,umask=0x81",
> > -             .desc = "A cross-core snoop resulted from L3 Eviction which misses in some processor core. Unit: uncore_cbox ",
> > +             .desc = "A cross-core snoop resulted from L3 Eviction which misses in some processor core. Unit: uncore_cbox",
> >               .topic = "uncore",
> >               .long_desc = "A cross-core snoop resulted from L3 Eviction which misses in some processor core",
> >               .pmu = "uncore_cbox",
> > @@ -151,7 +157,7 @@ static const struct perf_pmu_test_event uncore_hyphen = {
> >       .event = {
> >               .name = "event-hyphen",
> >               .event = "event=0xe0,umask=0x00",
> > -             .desc = "UNC_CBO_HYPHEN. Unit: uncore_cbox ",
> > +             .desc = "UNC_CBO_HYPHEN. Unit: uncore_cbox",
> >               .topic = "uncore",
> >               .long_desc = "UNC_CBO_HYPHEN",
> >               .pmu = "uncore_cbox",
> > @@ -165,7 +171,7 @@ static const struct perf_pmu_test_event uncore_two_hyph = {
> >       .event = {
> >               .name = "event-two-hyph",
> >               .event = "event=0xc0,umask=0x00",
> > -             .desc = "UNC_CBO_TWO_HYPH. Unit: uncore_cbox ",
> > +             .desc = "UNC_CBO_TWO_HYPH. Unit: uncore_cbox",
> >               .topic = "uncore",
> >               .long_desc = "UNC_CBO_TWO_HYPH",
> >               .pmu = "uncore_cbox",
> > @@ -179,7 +185,7 @@ static const struct perf_pmu_test_event uncore_hisi_l3c_rd_hit_cpipe = {
> >       .event = {
> >               .name = "uncore_hisi_l3c.rd_hit_cpipe",
> >               .event = "event=0x7",
> > -             .desc = "Total read hits. Unit: hisi_sccl,l3c ",
> > +             .desc = "Total read hits. Unit: hisi_sccl,l3c",
> >               .topic = "uncore",
> >               .long_desc = "Total read hits",
> >               .pmu = "hisi_sccl,l3c",
> > @@ -193,7 +199,7 @@ static const struct perf_pmu_test_event uncore_imc_free_running_cache_miss = {
> >       .event = {
> >               .name = "uncore_imc_free_running.cache_miss",
> >               .event = "event=0x12",
> > -             .desc = "Total cache misses. Unit: uncore_imc_free_running ",
> > +             .desc = "Total cache misses. Unit: uncore_imc_free_running",
> >               .topic = "uncore",
> >               .long_desc = "Total cache misses",
> >               .pmu = "uncore_imc_free_running",
> > @@ -207,7 +213,7 @@ static const struct perf_pmu_test_event uncore_imc_cache_hits = {
> >       .event = {
> >               .name = "uncore_imc.cache_hits",
> >               .event = "event=0x34",
> > -             .desc = "Total cache hits. Unit: uncore_imc ",
> > +             .desc = "Total cache hits. Unit: uncore_imc",
> >               .topic = "uncore",
> >               .long_desc = "Total cache hits",
> >               .pmu = "uncore_imc",
> > @@ -232,13 +238,13 @@ static const struct perf_pmu_test_event sys_ddr_pmu_write_cycles = {
> >       .event = {
> >               .name = "sys_ddr_pmu.write_cycles",
> >               .event = "event=0x2b",
> > -             .desc = "ddr write-cycles event. Unit: uncore_sys_ddr_pmu ",
> > +             .desc = "ddr write-cycles event. Unit: uncore_sys_ddr_pmu",
> >               .topic = "uncore",
> >               .pmu = "uncore_sys_ddr_pmu",
> >               .compat = "v8",
> >       },
> >       .alias_str = "event=0x2b",
> > -     .alias_long_desc = "ddr write-cycles event. Unit: uncore_sys_ddr_pmu ",
> > +     .alias_long_desc = "ddr write-cycles event. Unit: uncore_sys_ddr_pmu",
> >       .matching_pmu = "uncore_sys_ddr_pmu",
> >  };
> >
> > @@ -246,13 +252,13 @@ static const struct perf_pmu_test_event sys_ccn_pmu_read_cycles = {
> >       .event = {
> >               .name = "sys_ccn_pmu.read_cycles",
> >               .event = "config=0x2c",
> > -             .desc = "ccn read-cycles event. Unit: uncore_sys_ccn_pmu ",
> > +             .desc = "ccn read-cycles event. Unit: uncore_sys_ccn_pmu",
> >               .topic = "uncore",
> >               .pmu = "uncore_sys_ccn_pmu",
> >               .compat = "0x01",
> >       },
> >       .alias_str = "config=0x2c",
> > -     .alias_long_desc = "ccn read-cycles event. Unit: uncore_sys_ccn_pmu ",
> > +     .alias_long_desc = "ccn read-cycles event. Unit: uncore_sys_ccn_pmu",
> >       .matching_pmu = "uncore_sys_ccn_pmu",
> >  };
> >
> > @@ -403,7 +409,7 @@ static int test__pmu_event_table_core_callback(const struct pmu_event *pe,
> >       struct perf_pmu_test_event const **test_event_table;
> >       bool found = false;
> >
> > -     if (pe->pmu)
> > +     if (strcmp(pe->pmu, "cpu"))
> >               test_event_table = &uncore_events[0];
> >       else
> >               test_event_table = &core_events[0];

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