1 // Copyright 2013 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "base/android/sys_utils.h"
6
7 #include <memory>
8
9 #include "base/android/build_info.h"
10 #include "base/process/process_metrics.h"
11 #include "base/sys_info.h"
12 #include "base/trace_event/trace_event.h"
13 #include "jni/SysUtils_jni.h"
14
15 namespace base {
16 namespace android {
17
IsLowEndDeviceFromJni()18 bool SysUtils::IsLowEndDeviceFromJni() {
19 JNIEnv* env = AttachCurrentThread();
20 return Java_SysUtils_isLowEndDevice(env);
21 }
22
IsCurrentlyLowMemory()23 bool SysUtils::IsCurrentlyLowMemory() {
24 JNIEnv* env = AttachCurrentThread();
25 return Java_SysUtils_isCurrentlyLowMemory(env);
26 }
27
28 // Logs the number of minor / major page faults to tracing (and also the time to
29 // collect) the metrics. Does nothing if tracing is not enabled.
JNI_SysUtils_LogPageFaultCountToTracing(JNIEnv * env,const base::android::JavaParamRef<jclass> & jcaller)30 static void JNI_SysUtils_LogPageFaultCountToTracing(
31 JNIEnv* env,
32 const base::android::JavaParamRef<jclass>& jcaller) {
33 // This is racy, but we are OK losing data, and collecting it is potentially
34 // expensive (reading and parsing a file).
35 bool enabled;
36 TRACE_EVENT_CATEGORY_GROUP_ENABLED("startup", &enabled);
37 if (!enabled)
38 return;
39 TRACE_EVENT_BEGIN2("memory", "CollectPageFaultCount", "minor", 0, "major", 0);
40 std::unique_ptr<base::ProcessMetrics> process_metrics(
41 base::ProcessMetrics::CreateProcessMetrics(
42 base::GetCurrentProcessHandle()));
43 base::PageFaultCounts counts;
44 process_metrics->GetPageFaultCounts(&counts);
45 TRACE_EVENT_END2("memory", "CollectPageFaults", "minor", counts.minor,
46 "major", counts.major);
47 }
48
49 } // namespace android
50
51 } // namespace base
52