Re: [RFC PATCH v3 10/18] perf stat: Add build string function and topdown events handling in hardware-grouping

[Ian Rogers <irogers@google.com>]

On Tue, Dec 12, 2023 at 3:03 PM <weilin.wang@intel.com> wrote:
>
> From: Weilin Wang <weilin.wang@intel.com>
>
> Add the function to generate final grouping strings. This function is
> very similar to the existing metricgroup__build_event_string() function.
> The difference is that the input data includes a list of grouping lists.
>
> Signed-off-by: Weilin Wang <weilin.wang@intel.com>

Reviewed-by: Ian Rogers <irogers@google.com>

> ---
>  tools/perf/util/metricgroup.c | 96 +++++++++++++++++++++++++++++++++--
>  1 file changed, 93 insertions(+), 3 deletions(-)
>
> diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
> index 9d06fe4488dc..5d9ed22963be 100644
> --- a/tools/perf/util/metricgroup.c
> +++ b/tools/perf/util/metricgroup.c
> @@ -1899,6 +1899,96 @@ static int assign_event_grouping(struct metricgroup__event_info *e,
>         return ret;
>  }
>
> +static int hw_aware_metricgroup__build_event_string(struct list_head *group_strs,
> +                                          const char *modifier,
> +                                          struct list_head *groups)
> +{
> +       struct metricgroup__pmu_group_list *p;
> +       struct metricgroup__group *g;
> +       struct metricgroup__group_events *ge;
> +       bool no_group = true;
> +       int ret = 0;
> +
> +#define RETURN_IF_NON_ZERO(x) do { if (x) return x; } while (0)
> +
> +       list_for_each_entry(p, groups, nd) {
> +               list_for_each_entry(g, &p->group_head, nd) {
> +                       struct strbuf *events;
> +                       struct metricgroup__group_strs *new_group_str =
> +                               malloc(sizeof(struct metricgroup__group_strs));
> +
> +                       if (!new_group_str)
> +                               return -ENOMEM;
> +                       strbuf_init(&new_group_str->grouping_str, 0);
> +                       events = &new_group_str->grouping_str;
> +                       ret = strbuf_addch(events, '{');
> +                       RETURN_IF_NON_ZERO(ret);
> +                       no_group = true;
> +                       list_for_each_entry(ge, &g->event_head, nd) {
> +                               const char *sep, *rsep, *id = ge->event_name;
> +
> +                               pr_debug("found event %s\n", id);
> +
> +                               /* Separate events with commas and open the group if necessary. */
> +                               if (!no_group) {
> +                                       ret = strbuf_addch(events, ',');
> +                                       RETURN_IF_NON_ZERO(ret);
> +                               }
> +                               /*
> +                                * Encode the ID as an event string. Add a qualifier for
> +                                * metric_id that is the original name except with characters
> +                                * that parse-events can't parse replaced. For example,
> +                                * 'msr@tsc@' gets added as msr/tsc,metric-id=msr!3tsc!3/
> +                                */
> +                               sep = strchr(id, '@');
> +                               if (sep) {
> +                                       ret = strbuf_add(events, id, sep - id);
> +                                       RETURN_IF_NON_ZERO(ret);
> +                                       ret = strbuf_addch(events, '/');
> +                                       RETURN_IF_NON_ZERO(ret);
> +                                       rsep = strrchr(sep, '@');
> +                                       ret = strbuf_add(events, sep + 1, rsep - sep - 1);
> +                                       RETURN_IF_NON_ZERO(ret);
> +                                       ret = strbuf_addstr(events, ",metric-id=");
> +                                       RETURN_IF_NON_ZERO(ret);
> +                                       sep = rsep;
> +                               } else {
> +                                       sep = strchr(id, ':');
> +                                       if (sep) {
> +                                               ret = strbuf_add(events, id, sep - id);
> +                                               RETURN_IF_NON_ZERO(ret);
> +                                       } else {
> +                                               ret = strbuf_addstr(events, id);
> +                                               RETURN_IF_NON_ZERO(ret);
> +                                       }
> +                                       ret = strbuf_addstr(events, "/metric-id=");
> +                                       RETURN_IF_NON_ZERO(ret);
> +                               }
> +                               ret = encode_metric_id(events, id);
> +                               RETURN_IF_NON_ZERO(ret);
> +                               ret = strbuf_addstr(events, "/");
> +                               RETURN_IF_NON_ZERO(ret);
> +
> +                               if (sep) {
> +                                       ret = strbuf_addstr(events, sep + 1);
> +                                       RETURN_IF_NON_ZERO(ret);
> +                               }
> +                               if (modifier) {
> +                                       ret = strbuf_addstr(events, modifier);
> +                                       RETURN_IF_NON_ZERO(ret);
> +                               }
> +                               no_group = false;
> +                       }
> +                       ret = strbuf_addf(events, "}:W");
> +                       RETURN_IF_NON_ZERO(ret);
> +                       pr_debug("events-buf: %s\n", events->buf);
> +                       list_add_tail(&new_group_str->nd, group_strs);
> +               }
> +       }
> +       return ret;
> +#undef RETURN_IF_NON_ZERO
> +}
> +
>  /**
>   * create_grouping - Create a list of groups and place all the events of
>   * event_info_list into these groups.
> @@ -1910,8 +2000,8 @@ static int assign_event_grouping(struct metricgroup__event_info *e,
>   */
>  static int create_grouping(struct list_head *pmu_info_list,
>                           struct list_head *event_info_list,
> -                         struct list_head *groupings __maybe_unused,
> -                         const char *modifier __maybe_unused)
> +                         struct list_head *groupings,
> +                         const char *modifier)
>  {
>         int ret = 0;
>         struct metricgroup__event_info *e;
> @@ -1927,6 +2017,7 @@ static int create_grouping(struct list_head *pmu_info_list,
>                 if (ret)
>                         goto out;
>         }
> +       ret = hw_aware_metricgroup__build_event_string(groupings, modifier, &groups);
>  out:
>         metricgroup__free_group_list(&groups);
>         return ret;
> @@ -1957,7 +2048,6 @@ static int hw_aware_build_grouping(struct expr_parse_ctx *ctx __maybe_unused,
>                 const char *id = cur->pkey;
>
>                 pr_debug("found event %s\n", id);
> -

nit: unnecessary whitespace change for the patch

>                 ret = get_metricgroup_events(id, etable, &event_info_list);
>                 if (ret)
>                         goto err_out;
> --
> 2.39.3
>