[RFC PATCH 14/25] perf stat: Add build string function and topdown events handling in hardware-grouping

weilin.wang
2023-09-25T06:20:48Z

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.

Topdown events need special handling because they are not included in the
pmu-event JSON file. This should be a temporary solution to group topdown
events. Better solution could be using JSON files to cover these events.

Signed-off-by: Weilin Wang <weilin.wang@intel.com>
---
tools/perf/util/metricgroup.c | 106 +++++++++++++++++++++++++++++++++-
1 file changed, 103 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
index 4b1b0470d..797f831e1 100644
--- a/tools/perf/util/metricgroup.c
+++ b/tools/perf/util/metricgroup.c
@@ -1895,6 +1895,95 @@ 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.
@@ -1906,8 +1995,8 @@ 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;
@@ -1923,6 +2012,7 @@ 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;
@@ -1951,9 +2041,19 @@ static int hw_aware_build_grouping(struct expr_parse_ctx *ctx __maybe_unused,
#define RETURN_IF_NON_ZERO(x) do { if (x) return x; } while (0)
hashmap__for_each_entry(ctx->ids, cur, bkt) {
const char *id = cur->pkey;
+ const char *special_pattern = "topdown-";

pr_debug("found event %s\n", id);
-
+ if (!strncmp(id, special_pattern, strlen(special_pattern))) {
+ struct metricgroup__event_info *event;
+ event = event_info__new(id, "core", "0", true);
+ if (!event) {
+ ret = -ENOMEM;
+ goto err_out;
+ }
+ list_add(&event->nd, &event_info_list);
+ continue;
+ }
ret = get_metricgroup_events(id, etable, &event_info_list);
if (ret)
goto err_out;
--
2.39.3