netdev - [RFC PATCH 2/7] perf metricgroup: change evlist

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Message-Id: <20200507081436.49071-3-irogers@google.com>
Date:   Thu,  7 May 2020 01:14:31 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Kajol Jain <kjain@...ux.ibm.com>,
        Andi Kleen <ak@...ux.intel.com>,
        John Garry <john.garry@...wei.com>,
        Jin Yao <yao.jin@...ux.intel.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Kim Phillips <kim.phillips@....com>,
        linux-kernel@...r.kernel.org
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-perf-users@...r.kernel.org,
        Stephane Eranian <eranian@...gle.com>,
        Ian Rogers <irogers@...gle.com>
Subject: [RFC PATCH 2/7] perf metricgroup: change evlist_used to a bitmap

Use a bitmap rather than an array of bools.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/util/metricgroup.c | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
index 2f92dbc05226..dcd175c05872 100644
--- a/tools/perf/util/metricgroup.c
+++ b/tools/perf/util/metricgroup.c
@@ -95,7 +95,7 @@ struct egroup {
 static struct evsel *find_evsel_group(struct evlist *perf_evlist,
 				      struct expr_parse_ctx *pctx,
 				      struct evsel **metric_events,
-				      bool *evlist_used)
+				      unsigned long *evlist_used)
 {
 	struct evsel *ev;
 	bool leader_found;
@@ -105,7 +105,7 @@ static struct evsel *find_evsel_group(struct evlist *perf_evlist,
 	double *val_ptr;
 
 	evlist__for_each_entry (perf_evlist, ev) {
-		if (evlist_used[j++])
+		if (test_bit(j++, evlist_used))
 			continue;
 		if (hashmap__find(&pctx->ids, ev->name, (void**)&val_ptr)) {
 			if (!metric_events[i])
@@ -149,7 +149,7 @@ static struct evsel *find_evsel_group(struct evlist *perf_evlist,
 			j++;
 		}
 		ev = metric_events[i];
-		evlist_used[ev->idx] = true;
+		set_bit(ev->idx, evlist_used);
 	}
 
 	return metric_events[0];
@@ -165,13 +165,11 @@ static int metricgroup__setup_events(struct list_head *groups,
 	int ret = 0;
 	struct egroup *eg;
 	struct evsel *evsel;
-	bool *evlist_used;
+	unsigned long *evlist_used;
 
-	evlist_used = calloc(perf_evlist->core.nr_entries, sizeof(bool));
-	if (!evlist_used) {
-		ret = -ENOMEM;
-		return ret;
-	}
+	evlist_used = bitmap_alloc(perf_evlist->core.nr_entries);
+	if (!evlist_used)
+		return -ENOMEM;
 
 	list_for_each_entry (eg, groups, nd) {
 		struct evsel **metric_events;
@@ -209,7 +207,7 @@ static int metricgroup__setup_events(struct list_head *groups,
 		list_add(&expr->nd, &me->head);
 	}
 
-	free(evlist_used);
+	bitmap_free(evlist_used);
 
 	return ret;
 }
-- 
2.26.2.526.g744177e7f7-goog