| /* |
| * Copyright (C) 2020 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "core_jni_helpers.h" |
| |
| #include <cputimeinstate.h> |
| |
| namespace android { |
| |
| static jlongArray KernelCpuTotalBpfMapReader_readInternal(JNIEnv *env, jobject) { |
| auto freqTimes = android::bpf::getTotalCpuFreqTimes(); |
| if (!freqTimes) return nullptr; |
| |
| std::vector<uint64_t> allTimes; |
| for (const auto &vec : *freqTimes) { |
| for (const auto &timeNs : vec) { |
| allTimes.push_back(timeNs / 1000000); |
| } |
| } |
| |
| auto ar = env->NewLongArray(allTimes.size()); |
| if (ar != nullptr) { |
| env->SetLongArrayRegion(ar, 0, allTimes.size(), |
| reinterpret_cast<const jlong *>(allTimes.data())); |
| } |
| return ar; |
| } |
| |
| static const JNINativeMethod methods[] = { |
| {"readInternal", "()[J", (void *)KernelCpuTotalBpfMapReader_readInternal}, |
| }; |
| |
| int register_com_android_internal_os_KernelCpuTotalBpfMapReader(JNIEnv *env) { |
| return RegisterMethodsOrDie(env, "com/android/internal/os/KernelCpuTotalBpfMapReader", methods, |
| NELEM(methods)); |
| } |
| |
| } // namespace android |