| /* |
| * Copyright (C) 2021 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 jboolean KernelCpuBpfTracking_isSupported(JNIEnv *, jobject) { |
| return android::bpf::isTrackingUidTimesSupported() ? JNI_TRUE : JNI_FALSE; |
| } |
| |
| static jboolean KernelCpuBpfTracking_startTrackingInternal(JNIEnv *, jobject) { |
| return android::bpf::startTrackingUidTimes(); |
| } |
| |
| static jlongArray KernelCpuBpfTracking_getFreqsInternal(JNIEnv *env, jobject) { |
| auto freqs = android::bpf::getCpuFreqs(); |
| if (!freqs) return nullptr; |
| |
| std::vector<uint64_t> allFreqs; |
| for (const auto &vec : *freqs) std::copy(vec.begin(), vec.end(), std::back_inserter(allFreqs)); |
| |
| auto ar = env->NewLongArray(allFreqs.size()); |
| if (ar != nullptr) { |
| env->SetLongArrayRegion(ar, 0, allFreqs.size(), |
| reinterpret_cast<const jlong *>(allFreqs.data())); |
| } |
| return ar; |
| } |
| |
| static jintArray KernelCpuBpfTracking_getFreqsClustersInternal(JNIEnv *env, jobject) { |
| auto freqs = android::bpf::getCpuFreqs(); |
| if (!freqs) return nullptr; |
| |
| std::vector<uint32_t> freqsClusters; |
| uint32_t clusters = freqs->size(); |
| for (uint32_t c = 0; c < clusters; ++c) { |
| freqsClusters.insert(freqsClusters.end(), (*freqs)[c].size(), c); |
| } |
| |
| auto ar = env->NewIntArray(freqsClusters.size()); |
| if (ar != nullptr) { |
| env->SetIntArrayRegion(ar, 0, freqsClusters.size(), |
| reinterpret_cast<const jint *>(freqsClusters.data())); |
| } |
| return ar; |
| } |
| |
| static const JNINativeMethod methods[] = { |
| {"isSupported", "()Z", (void *)KernelCpuBpfTracking_isSupported}, |
| {"startTrackingInternal", "()Z", (void *)KernelCpuBpfTracking_startTrackingInternal}, |
| {"getFreqsInternal", "()[J", (void *)KernelCpuBpfTracking_getFreqsInternal}, |
| {"getFreqsClustersInternal", "()[I", (void *)KernelCpuBpfTracking_getFreqsClustersInternal}, |
| }; |
| |
| int register_com_android_internal_os_KernelCpuBpfTracking(JNIEnv *env) { |
| return RegisterMethodsOrDie(env, "com/android/internal/os/KernelCpuBpfTracking", methods, |
| NELEM(methods)); |
| } |
| |
| } // namespace android |