Re: [PATCH V4 7/7] perf mem: Clean up perf_pmus__num_mem_pmus()

[Ian Rogers]

On Tue, Jan 23, 2024 at 10:51 AM <kan.liang@xxxxxxxxxxxxxxx> wrote:
>
> From: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
>
> The number of mem PMUs can be calculated by searching the
> perf_pmus__scan_mem().
>
> Remove the ARCH specific perf_pmus__num_mem_pmus()
>
> Tested-by: Leo Yan <leo.yan@xxxxxxxxxx>
> Signed-off-by: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>

Reviewed-by: Ian Rogers <irogers@xxxxxxxxxx>

Thanks,
Ian

> ---
>  tools/perf/arch/x86/util/pmu.c | 10 ----------
>  tools/perf/builtin-c2c.c       |  2 +-
>  tools/perf/builtin-mem.c       |  2 +-
>  tools/perf/util/mem-events.c   | 14 ++++++++++++++
>  tools/perf/util/mem-events.h   |  1 +
>  tools/perf/util/pmus.c         |  6 ------
>  tools/perf/util/pmus.h         |  1 -
>  7 files changed, 17 insertions(+), 19 deletions(-)
>
> diff --git a/tools/perf/arch/x86/util/pmu.c b/tools/perf/arch/x86/util/pmu.c
> index 0f49ff13cfe2..c3d89d6ba1bf 100644
> --- a/tools/perf/arch/x86/util/pmu.c
> +++ b/tools/perf/arch/x86/util/pmu.c
> @@ -42,13 +42,3 @@ void perf_pmu__arch_init(struct perf_pmu *pmu __maybe_unused)
>                         pmu->mem_events = perf_mem_events_intel;
>         }
>  }
> -
> -int perf_pmus__num_mem_pmus(void)
> -{
> -       /* AMD uses IBS OP pmu and not a core PMU for perf mem/c2c */
> -       if (x86__is_amd_cpu())
> -               return 1;
> -
> -       /* Intel uses core pmus for perf mem/c2c */
> -       return perf_pmus__num_core_pmus();
> -}
> diff --git a/tools/perf/builtin-c2c.c b/tools/perf/builtin-c2c.c
> index 3bcb903b6b38..16b40f5d43db 100644
> --- a/tools/perf/builtin-c2c.c
> +++ b/tools/perf/builtin-c2c.c
> @@ -3278,7 +3278,7 @@ static int perf_c2c__record(int argc, const char **argv)
>                              PARSE_OPT_KEEP_UNKNOWN);
>
>         /* Max number of arguments multiplied by number of PMUs that can support them. */
> -       rec_argc = argc + 11 * perf_pmus__num_mem_pmus();
> +       rec_argc = argc + 11 * (perf_pmu__mem_events_num_mem_pmus(pmu) + 1);
>
>         rec_argv = calloc(rec_argc + 1, sizeof(char *));
>         if (!rec_argv)
> diff --git a/tools/perf/builtin-mem.c b/tools/perf/builtin-mem.c
> index 1d92e309c97c..5b851e64e4a1 100644
> --- a/tools/perf/builtin-mem.c
> +++ b/tools/perf/builtin-mem.c
> @@ -106,7 +106,7 @@ static int __cmd_record(int argc, const char **argv, struct perf_mem *mem)
>                              PARSE_OPT_KEEP_UNKNOWN);
>
>         /* Max number of arguments multiplied by number of PMUs that can support them. */
> -       rec_argc = argc + 9 * perf_pmus__num_mem_pmus();
> +       rec_argc = argc + 9 * (perf_pmu__mem_events_num_mem_pmus(pmu) + 1);
>
>         if (mem->cpu_list)
>                 rec_argc += 2;
> diff --git a/tools/perf/util/mem-events.c b/tools/perf/util/mem-events.c
> index a20611b4fb1b..637cbd4a7bfb 100644
> --- a/tools/perf/util/mem-events.c
> +++ b/tools/perf/util/mem-events.c
> @@ -62,6 +62,20 @@ struct perf_pmu *perf_mem_events_find_pmu(void)
>         return perf_pmus__scan_mem(NULL);
>  }
>
> +/**
> + * perf_pmu__mem_events_num_mem_pmus - Get the number of mem PMUs since the given pmu
> + * @pmu: Start pmu. If it's NULL, search the entire PMU list.
> + */
> +int perf_pmu__mem_events_num_mem_pmus(struct perf_pmu *pmu)
> +{
> +       int num = 0;
> +
> +       while ((pmu = perf_pmus__scan_mem(pmu)) != NULL)
> +               num++;
> +
> +       return num;
> +}
> +
>  static const char *perf_pmu__mem_events_name(int i, struct perf_pmu *pmu)
>  {
>         struct perf_mem_event *e;
> diff --git a/tools/perf/util/mem-events.h b/tools/perf/util/mem-events.h
> index c97cd3caa766..15d5f0320d27 100644
> --- a/tools/perf/util/mem-events.h
> +++ b/tools/perf/util/mem-events.h
> @@ -43,6 +43,7 @@ int perf_pmu__mem_events_init(struct perf_pmu *pmu);
>
>  struct perf_mem_event *perf_pmu__mem_events_ptr(struct perf_pmu *pmu, int i);
>  struct perf_pmu *perf_mem_events_find_pmu(void);
> +int perf_pmu__mem_events_num_mem_pmus(struct perf_pmu *pmu);
>  bool is_mem_loads_aux_event(struct evsel *leader);
>
>  void perf_pmu__mem_events_list(struct perf_pmu *pmu);
> diff --git a/tools/perf/util/pmus.c b/tools/perf/util/pmus.c
> index ce4931461741..16505071d362 100644
> --- a/tools/perf/util/pmus.c
> +++ b/tools/perf/util/pmus.c
> @@ -345,12 +345,6 @@ const struct perf_pmu *perf_pmus__pmu_for_pmu_filter(const char *str)
>         return NULL;
>  }
>
> -int __weak perf_pmus__num_mem_pmus(void)
> -{
> -       /* All core PMUs are for mem events. */
> -       return perf_pmus__num_core_pmus();
> -}
> -
>  /** Struct for ordering events as output in perf list. */
>  struct sevent {
>         /** PMU for event. */
> diff --git a/tools/perf/util/pmus.h b/tools/perf/util/pmus.h
> index 4c67153ac257..94d2a08d894b 100644
> --- a/tools/perf/util/pmus.h
> +++ b/tools/perf/util/pmus.h
> @@ -17,7 +17,6 @@ struct perf_pmu *perf_pmus__scan_core(struct perf_pmu *pmu);
>
>  const struct perf_pmu *perf_pmus__pmu_for_pmu_filter(const char *str);
>
> -int perf_pmus__num_mem_pmus(void);
>  void perf_pmus__print_pmu_events(const struct print_callbacks *print_cb, void *print_state);
>  bool perf_pmus__have_event(const char *pname, const char *name);
>  int perf_pmus__num_core_pmus(void);
> --
> 2.35.1
>