From 625993dfbb085a3cde7492eda8ec1cdc1ee39a78 Mon Sep 17 00:00:00 2001
From: Elliott Hughes <enh@google.com>
Date: Tue, 15 Jul 2014 16:53:13 -0700
Subject: Use VDSO for clock_gettime(2) and gettimeofday(2).

Bug: 15387103
Change-Id: Ifc3608ea65060c1dc38120b10b6e79874f182a36
---
 benchmarks/time_benchmark.cpp | 50 ++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 49 insertions(+), 1 deletion(-)

(limited to 'benchmarks/time_benchmark.cpp')

diff --git a/benchmarks/time_benchmark.cpp b/benchmarks/time_benchmark.cpp
index 3bf8c07f6..0a146aef7 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);
-- 
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