Re: [PATCH v4 02/48] perf stat: Add aggr creators that are passed a cpu.

[Arnaldo Carvalho de Melo <acme@kernel.org>]

Em Tue, Jan 11, 2022 at 11:36:02AM -0800, Ian Rogers escreveu:
> On Tue, Jan 11, 2022 at 11:33 AM Arnaldo Carvalho de Melo
> <acme@kernel.org> wrote:
> >
> > Em Tue, Jan 04, 2022 at 10:13:05PM -0800, Ian Rogers escreveu:
> > > The cpu_map and index can get confused. Add variants of the cpu_map__get
> > > routines that are passed a cpu. Make the existing cpu_map__get routines
> > > use the new functions with a view to remove them when no longer used.
> > >
> > > Reviewed-by: James Clark <james.clark@arm.com>
> > > Signed-off-by: Ian Rogers <irogers@google.com>
> > > ---
> > >  tools/perf/util/cpumap.c | 79 +++++++++++++++++++++++-----------------
> > >  tools/perf/util/cpumap.h |  6 ++-
> > >  2 files changed, 51 insertions(+), 34 deletions(-)
> > >
> > > diff --git a/tools/perf/util/cpumap.c b/tools/perf/util/cpumap.c
> > > index 87d3eca9b872..49fba2c53822 100644
> > > --- a/tools/perf/util/cpumap.c
> > > +++ b/tools/perf/util/cpumap.c
> > > @@ -128,21 +128,23 @@ int cpu_map__get_socket_id(int cpu)
> > >       return ret ?: value;
> > >  }
> > >
> > > -struct aggr_cpu_id cpu_map__get_socket(struct perf_cpu_map *map, int idx,
> > > -                                     void *data __maybe_unused)
> > > +struct aggr_cpu_id cpu_map__get_socket_aggr_by_cpu(int cpu, void *data __maybe_unused)
> > >  {
> > > -     int cpu;
> > >       struct aggr_cpu_id id = cpu_map__empty_aggr_cpu_id();
> > >
> > > -     if (idx > map->nr)
> > > -             return id;
> > > -
> > > -     cpu = map->map[idx];
> > > -
> > >       id.socket = cpu_map__get_socket_id(cpu);
> > >       return id;
> > >  }
> > >
> > > +struct aggr_cpu_id cpu_map__get_socket(struct perf_cpu_map *map, int idx,
> > > +                                    void *data)
> > > +{
> > > +     if (idx < 0 || idx > map->nr)
> > > +             return cpu_map__empty_aggr_cpu_id();
> > > +
> > > +     return cpu_map__get_socket_aggr_by_cpu(map->map[idx], data);
> > > +}
> > > +
> >
> >
> > This 'idx < 0' wasn't in the original code nor is described in the
> > comment log message, please avoid doing this, this may be harmless or
> > even a good hardening, but either way would be interesting to have it in
> > a separate patch. This eases review as in the end this code is just a
> > refactoring, moving things around but in the end should be equivalent code.
> >
> > There are a few more, please consider this and if you agree, to speed
> > things up I can make the changes here, if I think this won't fallout in
> > changes to subsequent patches touching this area.
> >
> > - Arnaldo
> 
> Fwiw, there's the same issue in cpu_map__get_die that's also in
> cpu_map__get_core, but weirdly not copied into cpu_map__get_node. As
> these functions are removed later I think doing nothing is best here.

Sure.
 
> Thanks,
> Ian
> 
> > >  static int cmp_aggr_cpu_id(const void *a_pointer, const void *b_pointer)
> > >  {
> > >       struct aggr_cpu_id *a = (struct aggr_cpu_id *)a_pointer;
> > > @@ -200,15 +202,10 @@ int cpu_map__get_die_id(int cpu)
> > >       return ret ?: value;
> > >  }
> > >
> > > -struct aggr_cpu_id cpu_map__get_die(struct perf_cpu_map *map, int idx, void *data)
> > > +struct aggr_cpu_id cpu_map__get_die_aggr_by_cpu(int cpu, void *data)
> > >  {
> > > -     int cpu, die;
> > > -     struct aggr_cpu_id id = cpu_map__empty_aggr_cpu_id();
> > > -
> > > -     if (idx > map->nr)
> > > -             return id;
> > > -
> > > -     cpu = map->map[idx];
> > > +     struct aggr_cpu_id id;
> > > +     int die;
> > >
> > >       die = cpu_map__get_die_id(cpu);
> > >       /* There is no die_id on legacy system. */
> > > @@ -220,7 +217,7 @@ struct aggr_cpu_id cpu_map__get_die(struct perf_cpu_map *map, int idx, void *dat
> > >        * with the socket ID and then add die to
> > >        * make a unique ID.
> > >        */
> > > -     id = cpu_map__get_socket(map, idx, data);
> > > +     id = cpu_map__get_socket_aggr_by_cpu(cpu, data);
> > >       if (cpu_map__aggr_cpu_id_is_empty(id))
> > >               return id;
> > >
> > > @@ -228,6 +225,15 @@ struct aggr_cpu_id cpu_map__get_die(struct perf_cpu_map *map, int idx, void *dat
> > >       return id;
> > >  }
> > >
> > > +struct aggr_cpu_id cpu_map__get_die(struct perf_cpu_map *map, int idx,
> > > +                                 void *data)
> > > +{
> > > +     if (idx < 0 || idx > map->nr)
> > > +             return cpu_map__empty_aggr_cpu_id();
> >
> > Ditto
> >
> > > +
> > > +     return cpu_map__get_die_aggr_by_cpu(map->map[idx], data);
> > > +}
> > > +
> > >  int cpu_map__get_core_id(int cpu)
> > >  {
> > >       int value, ret = cpu__get_topology_int(cpu, "core_id", &value);
> > > @@ -239,20 +245,13 @@ int cpu_map__get_node_id(int cpu)
> > >       return cpu__get_node(cpu);
> > >  }
> > >
> > > -struct aggr_cpu_id cpu_map__get_core(struct perf_cpu_map *map, int idx, void *data)
> > > +struct aggr_cpu_id cpu_map__get_core_aggr_by_cpu(int cpu, void *data)
> > >  {
> > > -     int cpu;
> > > -     struct aggr_cpu_id id = cpu_map__empty_aggr_cpu_id();
> > > -
> > > -     if (idx > map->nr)
> > > -             return id;
> > > -
> > > -     cpu = map->map[idx];
> > > -
> > > -     cpu = cpu_map__get_core_id(cpu);
> > > +     struct aggr_cpu_id id;
> > > +     int core = cpu_map__get_core_id(cpu);
> > >
> > >       /* cpu_map__get_die returns a struct with socket and die set*/
> > > -     id = cpu_map__get_die(map, idx, data);
> > > +     id = cpu_map__get_die_aggr_by_cpu(cpu, data);
> > >       if (cpu_map__aggr_cpu_id_is_empty(id))
> > >               return id;
> > >
> > > @@ -260,19 +259,33 @@ struct aggr_cpu_id cpu_map__get_core(struct perf_cpu_map *map, int idx, void *da
> > >        * core_id is relative to socket and die, we need a global id.
> > >        * So we combine the result from cpu_map__get_die with the core id
> > >        */
> > > -     id.core = cpu;
> > > +     id.core = core;
> > >       return id;
> > > +
> > >  }
> > >
> > > -struct aggr_cpu_id cpu_map__get_node(struct perf_cpu_map *map, int idx, void *data __maybe_unused)
> > > +struct aggr_cpu_id cpu_map__get_core(struct perf_cpu_map *map, int idx, void *data)
> > > +{
> > > +     if (idx < 0 || idx > map->nr)
> > > +             return cpu_map__empty_aggr_cpu_id();
> >
> > Ditto
> >
> > > +
> > > +     return cpu_map__get_core_aggr_by_cpu(map->map[idx], data);
> > > +}
> > > +
> > > +struct aggr_cpu_id cpu_map__get_node_aggr_by_cpu(int cpu, void *data __maybe_unused)
> > >  {
> > >       struct aggr_cpu_id id = cpu_map__empty_aggr_cpu_id();
> > >
> > > +     id.node = cpu_map__get_node_id(cpu);
> > > +     return id;
> > > +}
> > > +
> > > +struct aggr_cpu_id cpu_map__get_node(struct perf_cpu_map *map, int idx, void *data)
> > > +{
> > >       if (idx < 0 || idx >= map->nr)
> > > -             return id;
> > > +             return cpu_map__empty_aggr_cpu_id();
> > >
> > > -     id.node = cpu_map__get_node_id(map->map[idx]);
> > > -     return id;
> > > +     return cpu_map__get_node_aggr_by_cpu(map->map[idx], data);
> > >  }
> > >
> > >  int cpu_map__build_socket_map(struct perf_cpu_map *cpus, struct cpu_aggr_map **sockp)
> > > diff --git a/tools/perf/util/cpumap.h b/tools/perf/util/cpumap.h
> > > index a27eeaf086e8..c62d67704425 100644
> > > --- a/tools/perf/util/cpumap.h
> > > +++ b/tools/perf/util/cpumap.h
> > > @@ -31,13 +31,17 @@ size_t cpu_map__snprint(struct perf_cpu_map *map, char *buf, size_t size);
> > >  size_t cpu_map__snprint_mask(struct perf_cpu_map *map, char *buf, size_t size);
> > >  size_t cpu_map__fprintf(struct perf_cpu_map *map, FILE *fp);
> > >  int cpu_map__get_socket_id(int cpu);
> > > +struct aggr_cpu_id cpu_map__get_socket_aggr_by_cpu(int cpu, void *data);
> > >  struct aggr_cpu_id cpu_map__get_socket(struct perf_cpu_map *map, int idx, void *data);
> > >  int cpu_map__get_die_id(int cpu);
> > > +struct aggr_cpu_id cpu_map__get_die_aggr_by_cpu(int cpu, void *data);
> > >  struct aggr_cpu_id cpu_map__get_die(struct perf_cpu_map *map, int idx, void *data);
> > >  int cpu_map__get_core_id(int cpu);
> > > +struct aggr_cpu_id cpu_map__get_core_aggr_by_cpu(int cpu, void *data);
> > >  struct aggr_cpu_id cpu_map__get_core(struct perf_cpu_map *map, int idx, void *data);
> > >  int cpu_map__get_node_id(int cpu);
> > > -struct aggr_cpu_id  cpu_map__get_node(struct perf_cpu_map *map, int idx, void *data);
> > > +struct aggr_cpu_id cpu_map__get_node_aggr_by_cpu(int cpu, void *data);
> > > +struct aggr_cpu_id cpu_map__get_node(struct perf_cpu_map *map, int idx, void *data);
> > >  int cpu_map__build_socket_map(struct perf_cpu_map *cpus, struct cpu_aggr_map **sockp);
> > >  int cpu_map__build_die_map(struct perf_cpu_map *cpus, struct cpu_aggr_map **diep);
> > >  int cpu_map__build_core_map(struct perf_cpu_map *cpus, struct cpu_aggr_map **corep);
> > > --
> > > 2.34.1.448.ga2b2bfdf31-goog
> >
> > --
> >
> > - Arnaldo

-- 

- Arnaldo