| /* |
| * 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. |
| */ |
| |
| package com.android.internal.os; |
| |
| import android.annotation.Nullable; |
| |
| /** Reads total CPU time bpf map. */ |
| public final class KernelCpuTotalBpfMapReader { |
| private KernelCpuTotalBpfMapReader() { |
| } |
| |
| /** Reads total CPU times (excluding sleep) per frequency in milliseconds from bpf map. */ |
| @Nullable |
| public static long[] read() { |
| if (!KernelCpuBpfTracking.startTracking()) { |
| return null; |
| } |
| return readInternal(); |
| } |
| |
| @Nullable |
| private static native long[] readInternal(); |
| } |