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/*
* 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.
*/
package com.android.internal.os;
import android.annotation.Nullable;
import android.os.Process;
/**
* Reads CPU usage statistics about a selected process identified by its cmdline.
*
* Handles finding the pid for the process and delegates CPU usage reading from the eBPF map to
* KernelSingleProcessCpuThreadReader. Exactly one long-lived instance of the process is expected.
* Otherwise, no statistics are returned.
*
* See also SystemServerCpuThreadReader.
*/
public final class SelectedProcessCpuThreadReader {
private final String[] mCmdline;
private int mPid;
private KernelSingleProcessCpuThreadReader mKernelCpuThreadReader;
public SelectedProcessCpuThreadReader(String cmdline) {
mCmdline = new String[] { cmdline };
}
/** Returns CPU times, per thread group, since tracking started. */
@Nullable
public KernelSingleProcessCpuThreadReader.ProcessCpuUsage readAbsolute() {
int[] pids = Process.getPidsForCommands(mCmdline);
if (pids == null || pids.length != 1) {
return null;
}
int pid = pids[0];
if (mPid == pid) {
return mKernelCpuThreadReader.getProcessCpuUsage();
}
mPid = pid;
mKernelCpuThreadReader = KernelSingleProcessCpuThreadReader.create(mPid);
mKernelCpuThreadReader.startTrackingThreadCpuTimes();
return null;
}
}
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