Use VDSO for clock_gettime(2) and gettimeofday(2).

Bug: 15387103
Change-Id: Ifc3608ea65060c1dc38120b10b6e79874f182a36

2 files changed, 50 insertions, 2 deletions

diff --git a/benchmarks/Android.mk b/benchmarks/Android.mk
index f9722ae..4d7ad96 100644
--- a/benchmarks/Android.mk
+++ b/benchmarks/Android.mk
@@ -54,7 +54,7 @@ LOCAL_SHARED_LIBRARIES += libstlport
 LOCAL_SRC_FILES := $(benchmark_src_files)
 include $(BUILD_EXECUTABLE)
 
-ifeq ($(HOST_OS)-$(HOST_ARCH),linux-x86)
+ifeq ($(HOST_OS)-$(HOST_ARCH),$(filter $(HOST_OS)-$(HOST_ARCH),linux-x86 linux-x86_64))
 ifeq ($(TARGET_ARCH),x86)
 LINKER = linker
 NATIVE_SUFFIX=32
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 @@ BENCHMARK(BM_time_localtime_tz);
 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 @@ static void BM_time_clock_gettime(int iters) {
   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);