linux-kernel - [PATCH v4 4/9] perf evsel: Add iterator to iterate over events ordered by CPU

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Message-Id: <20191105002522.83803-5-andi@firstfloor.org>
Date:   Mon,  4 Nov 2019 16:25:17 -0800
From:   Andi Kleen <andi@...stfloor.org>
To:     acme@...nel.org
Cc:     jolsa@...nel.org, linux-kernel@...r.kernel.org,
        Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH v4 4/9] perf evsel: Add iterator to iterate over events ordered by CPU

From: Andi Kleen <ak@...ux.intel.com>

Add some common code that is needed to iterate over all events
in CPU order. Used in followon patches

Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---

v2: Add cpumap__for_each_cpu macro to factor out some common code
v3: Drop cpumap__for_each_cpu macro again, replace with evlist__for_each_cpu
Add new evlist__for_each_cpu
Don't compute cpus nir in cpu_index iterator init, just use all_cpus
---
 tools/perf/util/cpumap.h |  1 +
 tools/perf/util/evlist.c | 28 ++++++++++++++++++++++++++++
 tools/perf/util/evlist.h |  7 +++++++
 tools/perf/util/evsel.h  |  1 +
 4 files changed, 37 insertions(+)

diff --git a/tools/perf/util/cpumap.h b/tools/perf/util/cpumap.h
index 2553bef1279d..dbc1d7e949ed 100644
--- a/tools/perf/util/cpumap.h
+++ b/tools/perf/util/cpumap.h
@@ -60,4 +60,5 @@ int cpu_map__build_map(struct perf_cpu_map *cpus, struct perf_cpu_map **res,
 
 int cpu_map__cpu(struct perf_cpu_map *cpus, int idx);
 bool cpu_map__has(struct perf_cpu_map *cpus, int cpu);
+
 #endif /* __PERF_CPUMAP_H */
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index fdce590d2278..dccf96e0d01b 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -342,6 +342,34 @@ static int perf_evlist__nr_threads(struct evlist *evlist,
 		return perf_thread_map__nr(evlist->core.threads);
 }
 
+void evlist__cpu_iter_start(struct evlist *evlist)
+{
+	struct evsel *pos;
+
+	/*
+	 * Reset the per evsel cpu_index. This is needed because
+	 * each evsel's cpumap may have a different index space,
+	 * and some operations need the index to modify
+	 * the FD xyarray (e.g. open, close)
+	 */
+	evlist__for_each_entry(evlist, pos)
+		pos->cpu_index = 0;
+}
+
+bool evlist__cpu_iter_skip(struct evsel *ev, int cpu)
+{
+	if (ev->cpu_index >= ev->core.cpus->nr)
+		return true;
+	if (cpu >= 0 && ev->core.cpus->map[ev->cpu_index] != cpu)
+		return true;
+	return false;
+}
+
+void evlist__cpu_iter_next(struct evsel *ev)
+{
+	ev->cpu_index++;
+}
+
 void evlist__disable(struct evlist *evlist)
 {
 	struct evsel *pos;
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index 13051409fd22..106dd04f88aa 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -333,9 +333,16 @@ void perf_evlist__to_front(struct evlist *evlist,
 #define evlist__for_each_entry_safe(evlist, tmp, evsel) \
 	__evlist__for_each_entry_safe(&(evlist)->core.entries, tmp, evsel)
 
+#define evlist__for_each_cpu(evlist, index, cpu) \
+	perf_cpu_map__for_each_cpu (cpu, index, (evlist)->core.all_cpus)
+
 void perf_evlist__set_tracking_event(struct evlist *evlist,
 				     struct evsel *tracking_evsel);
 
+void evlist__cpu_iter_start(struct evlist *evlist);
+bool evlist__cpu_iter_skip(struct evsel *ev, int cpu);
+void evlist__cpu_iter_next(struct evsel *ev);
+
 struct evsel *
 perf_evlist__find_evsel_by_str(struct evlist *evlist, const char *str);
 
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index ddc5ee6f6592..cf90019ae744 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -95,6 +95,7 @@ struct evsel {
 	bool			collect_stat;
 	bool			weak_group;
 	bool			percore;
+	int			cpu_index;
 	const char		*pmu_name;
 	struct {
 		perf_evsel__sb_cb_t	*cb;
-- 
2.23.0