Reland of Added GetCpuTime to base/ to get total CPU time consumed by process for perf tests.
BUG=webrtc:7095
Review-Url: https://codereview.webrtc.org/2695743003
Cr-Commit-Position: refs/heads/master@{#16665}
Committed: https://chromium.googlesource.com/external/webrtc/+/3ff474b72ba1b34027e8391b1014c2838af445d4
patch from issue 2695743003 at patchset 440001 (http://crrev.com/2695743003#ps440001)
Review-Url: https://codereview.webrtc.org/2706823002
Cr-Commit-Position: refs/heads/master@{#16736}
diff --git a/webrtc/base/cpu_time.cc b/webrtc/base/cpu_time.cc
new file mode 100644
index 0000000..5fce366
--- /dev/null
+++ b/webrtc/base/cpu_time.cc
@@ -0,0 +1,114 @@
+/*
+ * Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
+ *
+ * Use of this source code is governed by a BSD-style license
+ * that can be found in the LICENSE file in the root of the source
+ * tree. An additional intellectual property rights grant can be found
+ * in the file PATENTS. All contributing project authors may
+ * be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "webrtc/base/cpu_time.h"
+#include "webrtc/base/logging.h"
+#include "webrtc/base/timeutils.h"
+
+#if defined(WEBRTC_LINUX)
+#include <time.h>
+#elif defined(WEBRTC_MAC)
+#include <sys/resource.h>
+#include <sys/types.h>
+#include <sys/times.h>
+#include <mach/thread_info.h>
+#include <mach/thread_act.h>
+#include <mach/mach_init.h>
+#include <unistd.h>
+#elif defined(WEBRTC_WIN)
+#include <windows.h>
+#endif
+
+#if defined(WEBRTC_WIN)
+namespace {
+// FILETIME resolution is 100 nanosecs.
+const int64_t kNanosecsPerFiletime = 100;
+} // namespace
+#endif
+
+namespace rtc {
+
+int64_t GetProcessCpuTimeNanos() {
+#if defined(WEBRTC_LINUX)
+ struct timespec ts;
+ if (clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts) == 0) {
+ return ts.tv_sec * kNumNanosecsPerSec + ts.tv_nsec;
+ } else {
+ LOG_ERR(LS_ERROR) << "clock_gettime() failed.";
+ }
+#elif defined(WEBRTC_MAC)
+ struct rusage rusage;
+ if (getrusage(RUSAGE_SELF, &rusage) == 0) {
+ return rusage.ru_utime.tv_sec * kNumNanosecsPerSec +
+ rusage.ru_utime.tv_usec * kNumNanosecsPerMicrosec;
+ } else {
+ LOG_ERR(LS_ERROR) << "getrusage() failed.";
+ }
+#elif defined(WEBRTC_WIN)
+ FILETIME createTime;
+ FILETIME exitTime;
+ FILETIME kernelTime;
+ FILETIME userTime;
+ if (GetProcessTimes(GetCurrentProcess(), &createTime, &exitTime, &kernelTime,
+ &userTime) != 0) {
+ return ((static_cast<uint64_t>(userTime.dwHighDateTime) << 32) +
+ userTime.dwLowDateTime) *
+ kNanosecsPerFiletime;
+ } else {
+ LOG_ERR(LS_ERROR) << "GetProcessTimes() failed.";
+ }
+#else
+ // Not implemented yet.
+ static_assert(
+ false, "GetProcessCpuTimeNanos() platform support not yet implemented.");
+#endif
+ return -1;
+}
+
+int64_t GetThreadCpuTimeNanos() {
+#if defined(WEBRTC_LINUX)
+ struct timespec ts;
+ if (clock_gettime(CLOCK_THREAD_CPUTIME_ID, &ts) == 0) {
+ return ts.tv_sec * kNumNanosecsPerSec + ts.tv_nsec;
+ } else {
+ LOG_ERR(LS_ERROR) << "clock_gettime() failed.";
+ }
+#elif defined(WEBRTC_MAC)
+ thread_basic_info_data_t info;
+ mach_msg_type_number_t count = THREAD_BASIC_INFO_COUNT;
+ if (thread_info(mach_thread_self(), THREAD_BASIC_INFO, (thread_info_t)&info,
+ &count) == KERN_SUCCESS) {
+ return info.user_time.seconds * kNumNanosecsPerSec +
+ info.user_time.microseconds * kNumNanosecsPerMicrosec;
+ } else {
+ LOG_ERR(LS_ERROR) << "thread_info() failed.";
+ }
+#elif defined(WEBRTC_WIN)
+ FILETIME createTime;
+ FILETIME exitTime;
+ FILETIME kernelTime;
+ FILETIME userTime;
+ if (GetThreadTimes(GetCurrentThread(), &createTime, &exitTime, &kernelTime,
+ &userTime) != 0) {
+ return ((static_cast<uint64_t>(userTime.dwHighDateTime) << 32) +
+ userTime.dwLowDateTime) *
+ kNanosecsPerFiletime;
+ } else {
+ LOG_ERR(LS_ERROR) << "GetThreadTimes() failed.";
+ }
+#else
+ // Not implemented yet.
+ static_assert(
+ false, "GetProcessCpuTimeNanos() platform support not yet implemented.");
+#endif
+ return -1;
+}
+
+} // namespace rtc