Use VDSO for clock_gettime(2) and gettimeofday(2).
Bug: 15387103
(cherry picked from commit 625993dfbb085a3cde7492eda8ec1cdc1ee39a78)
Change-Id: I0e156d7049ba1495902259071a96936592e74025
diff --git a/benchmarks/time_benchmark.cpp b/benchmarks/time_benchmark.cpp
index 3bf8c07..0a146ae 100644
--- a/benchmarks/time_benchmark.cpp
+++ b/benchmarks/time_benchmark.cpp
@@ -16,6 +16,7 @@
#include "benchmark.h"
+#include <sys/syscall.h>
#include <time.h>
#if defined(__BIONIC__)
@@ -41,7 +42,7 @@
static void BM_time_clock_gettime(int iters) {
StartBenchmarkTiming();
- struct timespec t;
+ timespec t;
for (int i = 0; i < iters; ++i) {
clock_gettime(CLOCK_MONOTONIC, &t);
}
@@ -49,3 +50,50 @@
StopBenchmarkTiming();
}
BENCHMARK(BM_time_clock_gettime);
+
+static void BM_time_clock_gettime_syscall(int iters) {
+ StartBenchmarkTiming();
+
+ timespec t;
+ for (int i = 0; i < iters; ++i) {
+ syscall(__NR_clock_gettime, CLOCK_MONOTONIC, &t);
+ }
+
+ StopBenchmarkTiming();
+}
+BENCHMARK(BM_time_clock_gettime_syscall);
+
+static void BM_time_gettimeofday(int iters) {
+ StartBenchmarkTiming();
+
+ timeval tv;
+ for (int i = 0; i < iters; ++i) {
+ gettimeofday(&tv, NULL);
+ }
+
+ StopBenchmarkTiming();
+}
+BENCHMARK(BM_time_gettimeofday);
+
+static void BM_time_gettimeofday_syscall(int iters) {
+ StartBenchmarkTiming();
+
+ timeval tv;
+ for (int i = 0; i < iters; ++i) {
+ syscall(__NR_gettimeofday, &tv, NULL);
+ }
+
+ StopBenchmarkTiming();
+}
+BENCHMARK(BM_time_gettimeofday_syscall);
+
+static void BM_time_time(int iters) {
+ StartBenchmarkTiming();
+
+ for (int i = 0; i < iters; ++i) {
+ time(NULL);
+ }
+
+ StopBenchmarkTiming();
+}
+BENCHMARK(BM_time_time);