Merge "liblog: clock_gettime, clock_getres and time benchmarks" am: 5ee641c6cd am: 86e6da192f (244d29ba) · Commits · e / os / android_system_core

liblog/tests/liblog_benchmark.cpp

+60 −0

Original line number	Original line	Diff line number	Diff line
	@@ -19,6 +19,7 @@
	#include <poll.h>		#include <poll.h>
	#include <sys/endian.h>		#include <sys/endian.h>
	#include <sys/socket.h>		#include <sys/socket.h>
			#include <sys/syscall.h>
	#include <sys/types.h>		#include <sys/types.h>
	#include <unistd.h>		#include <unistd.h>

	@@ -107,6 +108,65 @@ static void BM_clock_overhead(benchmark::State& state) {
	}		}
	BENCHMARK(BM_clock_overhead);		BENCHMARK(BM_clock_overhead);

			static void do_clock_overhead(benchmark::State& state, clockid_t clk_id) {
			timespec t;
			while (state.KeepRunning()) {
			clock_gettime(clk_id, &t);
			}
			}

			static void BM_time_clock_gettime_REALTIME(benchmark::State& state) {
			do_clock_overhead(state, CLOCK_REALTIME);
			}
			BENCHMARK(BM_time_clock_gettime_REALTIME);

			static void BM_time_clock_gettime_MONOTONIC(benchmark::State& state) {
			do_clock_overhead(state, CLOCK_MONOTONIC);
			}
			BENCHMARK(BM_time_clock_gettime_MONOTONIC);

			static void BM_time_clock_gettime_MONOTONIC_syscall(benchmark::State& state) {
			timespec t;
			while (state.KeepRunning()) {
			syscall(__NR_clock_gettime, CLOCK_MONOTONIC, &t);
			}
			}
			BENCHMARK(BM_time_clock_gettime_MONOTONIC_syscall);

			static void BM_time_clock_gettime_MONOTONIC_RAW(benchmark::State& state) {
			do_clock_overhead(state, CLOCK_MONOTONIC_RAW);
			}
			BENCHMARK(BM_time_clock_gettime_MONOTONIC_RAW);

			static void BM_time_clock_gettime_BOOTTIME(benchmark::State& state) {
			do_clock_overhead(state, CLOCK_BOOTTIME);
			}
			BENCHMARK(BM_time_clock_gettime_BOOTTIME);

			static void BM_time_clock_getres_MONOTONIC(benchmark::State& state) {
			timespec t;
			while (state.KeepRunning()) {
			clock_getres(CLOCK_MONOTONIC, &t);
			}
			}
			BENCHMARK(BM_time_clock_getres_MONOTONIC);

			static void BM_time_clock_getres_MONOTONIC_syscall(benchmark::State& state) {
			timespec t;
			while (state.KeepRunning()) {
			syscall(__NR_clock_getres, CLOCK_MONOTONIC, &t);
			}
			}
			BENCHMARK(BM_time_clock_getres_MONOTONIC_syscall);

			static void BM_time_time(benchmark::State& state) {
			while (state.KeepRunning()) {
			time_t now;
			now = time(&now);
			}
			}
			BENCHMARK(BM_time_time);

	/*		/*
	* Measure the time it takes to submit the android logging data to pstore		* Measure the time it takes to submit the android logging data to pstore
	*/		*/