1 files changed, 51 insertions, 0 deletions
diff --git a/base/android/sys_utils.cc b/base/android/sys_utils.cc
new file mode 100644
index 0000000000..7872b2f7d5
--- /dev/null
+++ b/base/android/sys_utils.cc
@@ -0,0 +1,51 @@
+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/android/sys_utils.h"
+
+#include <memory>
+
+#include "base/android/build_info.h"
+#include "base/process/process_metrics.h"
+#include "base/sys_info.h"
+#include "base/trace_event/trace_event.h"
+#include "jni/SysUtils_jni.h"
+
+namespace base {
+namespace android {
+
+bool SysUtils::IsLowEndDeviceFromJni() {
+  JNIEnv* env = AttachCurrentThread();
+  return Java_SysUtils_isLowEndDevice(env);
+}
+
+bool SysUtils::IsCurrentlyLowMemory() {
+  JNIEnv* env = AttachCurrentThread();
+  return Java_SysUtils_isCurrentlyLowMemory(env);
+}
+
+// Logs the number of minor / major page faults to tracing (and also the time to
+// collect) the metrics. Does nothing if tracing is not enabled.
+static void JNI_SysUtils_LogPageFaultCountToTracing(
+    JNIEnv* env,
+    const base::android::JavaParamRef<jclass>& jcaller) {
+  // This is racy, but we are OK losing data, and collecting it is potentially
+  // expensive (reading and parsing a file).
+  bool enabled;
+  TRACE_EVENT_CATEGORY_GROUP_ENABLED("startup", &enabled);
+  if (!enabled)
+    return;
+  TRACE_EVENT_BEGIN2("memory", "CollectPageFaultCount", "minor", 0, "major", 0);
+  std::unique_ptr<base::ProcessMetrics> process_metrics(
+      base::ProcessMetrics::CreateProcessMetrics(
+          base::GetCurrentProcessHandle()));
+  base::PageFaultCounts counts;
+  process_metrics->GetPageFaultCounts(&counts);
+  TRACE_EVENT_END2("memory", "CollectPageFaults", "minor", counts.minor,
+                   "major", counts.major);
+}
+
+}  // namespace android
+
+}  // namespace base