linux-kernel - Re: [PATCH V3 2/2] perf top: Uniform the event name for the hybrid machine

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Date:   Wed, 13 Dec 2023 13:57:29 -0800
From:   Namhyung Kim <namhyung@...nel.org>
To:     kan.liang@...ux.intel.com
Cc:     acme@...nel.org, irogers@...gle.com, mark.rutland@....com,
        maz@...nel.org, marcan@...can.st, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org
Subject: Re: [PATCH V3 2/2] perf top: Uniform the event name for the hybrid machine

On Wed, Dec 13, 2023 at 1:36 PM <kan.liang@...ux.intel.com> wrote:
>
> From: Kan Liang <kan.liang@...ux.intel.com>
>
> It's hard to distinguish the default cycles events among hybrid PMUs.
> For example,
>
>  $perf top
> Available samples
> 385 cycles:P
> 903 cycles:P
>
> The other tool, e.g., perf record, uniforms the event name and adds the
> hybrid PMU name before opening the event. So the events can be easily
> distinguished. Apply the same methodology for the perf top as well.
>
> The record__uniquify_name() will be invoked by both record and top.
> Move it to util/record.c

Maybe better to rename it to evlist__uniquify_name() and move it
to util/evlist.c.

Thanks,
Namhyung

>
> With the patch
>  $perf top
> Available samples
> 148 cpu_atom/cycles:P/
> 1K cpu_core/cycles:P/
>
> Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
> ---
>
> New patch to address the display concern
> https://lore.kernel.org/lkml/e9383607-1e43-4c1a-9512-29f27784d035@linux.intel.com/
>
>  tools/perf/builtin-record.c | 28 +---------------------------
>  tools/perf/builtin-top.c    |  1 +
>  tools/perf/util/record.c    | 25 +++++++++++++++++++++++++
>  tools/perf/util/record.h    |  2 ++
>  4 files changed, 29 insertions(+), 27 deletions(-)
>
> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> index dcf288a4fb9a..a096422a4a14 100644
> --- a/tools/perf/builtin-record.c
> +++ b/tools/perf/builtin-record.c
> @@ -2216,32 +2216,6 @@ static void hit_auxtrace_snapshot_trigger(struct record *rec)
>         }
>  }
>
> -static void record__uniquify_name(struct record *rec)
> -{
> -       struct evsel *pos;
> -       struct evlist *evlist = rec->evlist;
> -       char *new_name;
> -       int ret;
> -
> -       if (perf_pmus__num_core_pmus() == 1)
> -               return;
> -
> -       evlist__for_each_entry(evlist, pos) {
> -               if (!evsel__is_hybrid(pos))
> -                       continue;
> -
> -               if (strchr(pos->name, '/'))
> -                       continue;
> -
> -               ret = asprintf(&new_name, "%s/%s/",
> -                              pos->pmu_name, pos->name);
> -               if (ret) {
> -                       free(pos->name);
> -                       pos->name = new_name;
> -               }
> -       }
> -}
> -
>  static int record__terminate_thread(struct record_thread *thread_data)
>  {
>         int err;
> @@ -2475,7 +2449,7 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
>         if (data->is_pipe && rec->evlist->core.nr_entries == 1)
>                 rec->opts.sample_id = true;
>
> -       record__uniquify_name(rec);
> +       record__uniquify_name(rec->evlist);
>
>         /* Debug message used by test scripts */
>         pr_debug3("perf record opening and mmapping events\n");
> diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
> index cce9350177e2..4e8296654280 100644
> --- a/tools/perf/builtin-top.c
> +++ b/tools/perf/builtin-top.c
> @@ -1299,6 +1299,7 @@ static int __cmd_top(struct perf_top *top)
>                 }
>         }
>
> +       record__uniquify_name(top->evlist);
>         ret = perf_top__start_counters(top);
>         if (ret)
>                 return ret;
> diff --git a/tools/perf/util/record.c b/tools/perf/util/record.c
> index 9eb5c6a08999..5b4be3c72cbc 100644
> --- a/tools/perf/util/record.c
> +++ b/tools/perf/util/record.c
> @@ -289,3 +289,28 @@ int record__parse_freq(const struct option *opt, const char *str, int unset __ma
>         opts->user_freq = freq;
>         return 0;
>  }
> +
> +void record__uniquify_name(struct evlist *evlist)
> +{
> +       struct evsel *pos;
> +       char *new_name;
> +       int ret;
> +
> +       if (perf_pmus__num_core_pmus() == 1)
> +               return;
> +
> +       evlist__for_each_entry(evlist, pos) {
> +               if (!evsel__is_hybrid(pos))
> +                       continue;
> +
> +               if (strchr(pos->name, '/'))
> +                       continue;
> +
> +               ret = asprintf(&new_name, "%s/%s/",
> +                              pos->pmu_name, pos->name);
> +               if (ret) {
> +                       free(pos->name);
> +                       pos->name = new_name;
> +               }
> +       }
> +}
> diff --git a/tools/perf/util/record.h b/tools/perf/util/record.h
> index a6566134e09e..9b520ab784bc 100644
> --- a/tools/perf/util/record.h
> +++ b/tools/perf/util/record.h
> @@ -8,6 +8,7 @@
>  #include <linux/stddef.h>
>  #include <linux/perf_event.h>
>  #include "util/target.h"
> +#include "util/evlist.h"
>
>  struct option;
>
> @@ -85,6 +86,7 @@ extern const char * const *record_usage;
>  extern struct option *record_options;
>
>  int record__parse_freq(const struct option *opt, const char *str, int unset);
> +void record__uniquify_name(struct evlist *evlist);
>
>  static inline bool record_opts__no_switch_events(const struct record_opts *opts)
>  {
> --
> 2.35.1
>