linux-kernel - [RFC PATCH 12/25] perf stat: Add more functions for hardware-grouping method

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Message-Id: <20230925061824.3818631-13-weilin.wang@intel.com>
Date:   Sun, 24 Sep 2023 23:18:11 -0700
From:   weilin.wang@...el.com
To:     weilin.wang@...el.com, Ian Rogers <irogers@...gle.com>,
        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>
Cc:     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>
Subject: [RFC PATCH 12/25] perf stat: Add more functions for hardware-grouping method

From: Weilin Wang <weilin.wang@...el.com>

Add function to fill all bits of one counter bitmap. Add functions to
create new groups when no counter is available in all the existing groups.

Signed-off-by: Weilin Wang <weilin.wang@...el.com>
---
 tools/perf/util/metricgroup.c | 39 ++++++++++++++++++++++++++++++-----
 1 file changed, 34 insertions(+), 5 deletions(-)

diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
index 68d56087b..8d54e71bf 100644
--- a/tools/perf/util/metricgroup.c
+++ b/tools/perf/util/metricgroup.c
@@ -1702,6 +1702,19 @@ static int get_pmu_counter_layouts(struct list_head *pmu_info_list,
 	return ret;
 }
 
+static int fill_counter_bitmap(unsigned long *bitmap, int start, int size)
+{
+	int ret;
+	bitmap_zero(bitmap, NR_COUNTERS);
+
+	for (int pos = start; pos < start + size; pos++) {
+		ret = set_counter_bitmap(pos, bitmap);
+		if (ret)
+			return ret;
+	}
+	return 0;
+}
+
 /**
  * Find if there is a counter available for event e in current_group. If a
  * counter is available, use this counter by fill the bit in the correct counter
@@ -1750,6 +1763,21 @@ static int _insert_event(struct metricgroup__event_info *e,
 	return 0;
 }
 
+/**
+ * Insert the new_group node at the end of the group list.
+ */
+static int insert_new_group(struct list_head *head,
+			   struct metricgroup__group *new_group,
+			   size_t size,
+			   size_t fixed_size)
+{
+	INIT_LIST_HEAD(&new_group->event_head);
+	fill_counter_bitmap(new_group->gp_counters, 0, size);
+	fill_counter_bitmap(new_group->fixed_counters, 0, fixed_size);
+	list_add_tail(&new_group->nd, head);
+	return 0;
+}
+
 /**
  * Insert event e into a group capable to include it
  *
@@ -1759,7 +1787,7 @@ static int insert_event_to_group(struct metricgroup__event_info *e,
 {
 	struct metricgroup__group *g;
 	int ret;
-	//struct list_head *head;
+	struct list_head *head;
 
 	list_for_each_entry(g, &pmu_group_head->group_head, nd) {
 		ret = find_and_set_counters(e, g);
@@ -1774,13 +1802,14 @@ static int insert_event_to_group(struct metricgroup__event_info *e,
 	 */
 	{
 		struct metricgroup__group *current_group = malloc(sizeof(struct metricgroup__group));
+
 		if (!current_group)
 			return -ENOMEM;
 		pr_debug("create_new_group for [event] %s\n", e->name);
 
-		//head = &pmu_group_head->group_head;
-		//ret = create_new_group(head, current_group, pmu_group_head->size,
-		//			pmu_group_head->fixed_size);
+		head = &pmu_group_head->group_head;
+		ret = insert_new_group(head, current_group, pmu_group_head->size,
+				      pmu_group_head->fixed_size);
 		if (ret)
 			return ret;
 		ret = find_and_set_counters(e, current_group);
@@ -1817,7 +1846,7 @@ static int assign_event_grouping(struct metricgroup__event_info *e,
 
 		pmu_group_head = malloc(sizeof(struct metricgroup__pmu_group_list));
 		INIT_LIST_HEAD(&pmu_group_head->group_head);
-		pr_debug("create new group for event %s in pmu %s ", e->name, e->pmu_name);
+		pr_debug("create new group for event %s in pmu %s\n", e->name, e->pmu_name);
 		pmu_group_head->pmu_name = e->pmu_name;
 		list_for_each_entry(p, pmu_info_list, nd) {
 			if (!strcasecmp(p->name, e->pmu_name)) {
-- 
2.39.3