Merge "liblog: event_tag_map benchmark" (4afb3ef9) · Commits · e / os / android_system_core

liblog/tests/liblog_benchmark.cpp

+96 −0

Original line number	Diff line number	Diff line
		@@ -20,7 +20,10 @@
		#include <sys/types.h>
		#include <unistd.h>

		#include <unordered_set>

		#include <cutils/sockets.h>
		#include <log/event_tag_map.h>
		#include <private/android_logger.h>

		#include "benchmark.h"
		@@ -689,3 +692,96 @@ static void BM_security(int iters) {
		StopBenchmarkTiming();
		}
		BENCHMARK(BM_security);

		// Keep maps around for multiple iterations
		static std::unordered_set<uint32_t> set;
		static const EventTagMap* map;

		static bool prechargeEventMap() {
		if (map) return true;

		fprintf(stderr, "Precharge: start\n");

		map = android_openEventTagMap(NULL);
		for (uint32_t tag = 1; tag < USHRT_MAX; ++tag) {
		size_t len;
		if (android_lookupEventTag_len(map, &len, tag) == NULL) continue;
		set.insert(tag);
		}

		fprintf(stderr, "Precharge: stop %zu\n", set.size());

		return true;
		}

		/*
		* Measure the time it takes for android_lookupEventTag_len
		*/
		static void BM_lookupEventTag(int iters) {

		prechargeEventMap();

		std::unordered_set<uint32_t>::const_iterator it = set.begin();

		StartBenchmarkTiming();

		for (int i = 0; i < iters; ++i) {
		size_t len;
		android_lookupEventTag_len(map, &len, (*it));
		++it;
		if (it == set.end()) it = set.begin();
		}

		StopBenchmarkTiming();
		}
		BENCHMARK(BM_lookupEventTag);

		/*
		* Measure the time it takes for android_lookupEventTag_len
		*/
		static uint32_t notTag = 1;

		static void BM_lookupEventTag_NOT(int iters) {

		prechargeEventMap();

		while (set.find(notTag) != set.end()) {
		++notTag;
		if (notTag >= USHRT_MAX) notTag = 1;
		}

		StartBenchmarkTiming();

		for (int i = 0; i < iters; ++i) {
		size_t len;
		android_lookupEventTag_len(map, &len, notTag);
		}

		StopBenchmarkTiming();

		++notTag;
		if (notTag >= USHRT_MAX) notTag = 1;
		}
		BENCHMARK(BM_lookupEventTag_NOT);

		/*
		* Measure the time it takes for android_lookupEventFormat_len
		*/
		static void BM_lookupEventFormat(int iters) {

		prechargeEventMap();

		std::unordered_set<uint32_t>::const_iterator it = set.begin();

		StartBenchmarkTiming();

		for (int i = 0; i < iters; ++i) {
		size_t len;
		android_lookupEventFormat_len(map, &len, (*it));
		++it;
		if (it == set.end()) it = set.begin();
		}

		StopBenchmarkTiming();
		}
		BENCHMARK(BM_lookupEventFormat);