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Date: Wed, 24 Jan 2024 10:36:54 -0800
From: Ian Rogers <irogers@...gle.com>
To: weilin.wang@...el.com
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>, 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>,
linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
Perry Taylor <perry.taylor@...el.com>, Samantha Alt <samantha.alt@...el.com>,
Caleb Biggers <caleb.biggers@...el.com>, Mark Rutland <mark.rutland@....com>,
Yang Jihong <yangjihong1@...wei.com>
Subject: Re: [RFC PATCH v3 10/18] perf stat: Add build string function and
topdown events handling in hardware-grouping
On Tue, Dec 12, 2023 at 3:03 PM <weilin.wang@...el.com> wrote:
>
> From: Weilin Wang <weilin.wang@...el.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@...el.com>
Reviewed-by: Ian Rogers <irogers@...gle.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
>
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