110 lines
3.6 KiB
Java
110 lines
3.6 KiB
Java
/*
|
|
* Copyright (C) 2023 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 com.android.internal.util.ProcFileReader;
|
|
|
|
import java.io.FileInputStream;
|
|
import java.io.IOException;
|
|
import java.util.function.BiConsumer;
|
|
import java.util.function.Consumer;
|
|
import java.util.function.Predicate;
|
|
|
|
/**
|
|
* Reads and parses {@code binder_logs/stats} file in the {@code binderfs} filesystem.
|
|
* Reuse procFileReader as the contents are generated by Linux kernel in the same way.
|
|
*
|
|
* A typical example of binderfs stats log
|
|
*
|
|
* binder stats:
|
|
* BC_TRANSACTION: 378004
|
|
* BC_REPLY: 268352
|
|
* BC_FREE_BUFFER: 665854
|
|
* ...
|
|
* proc 12645
|
|
* context binder
|
|
* threads: 12
|
|
* requested threads: 0+5/15
|
|
* ready threads 0
|
|
* free async space 520192
|
|
* ...
|
|
*/
|
|
@android.ravenwood.annotation.RavenwoodKeepWholeClass
|
|
public class BinderfsStatsReader {
|
|
private final String mPath;
|
|
|
|
public BinderfsStatsReader() {
|
|
mPath = "/dev/binderfs/binder_logs/stats";
|
|
}
|
|
|
|
public BinderfsStatsReader(String path) {
|
|
mPath = path;
|
|
}
|
|
|
|
/**
|
|
* Read binderfs stats and call the consumer(pid, free) function for each valid process
|
|
*
|
|
* @param predicate Test if the pid is valid.
|
|
* @param biConsumer Callback function for each valid pid and its free async space
|
|
* @param consumer The error function to deal with exceptions
|
|
*/
|
|
public void handleFreeAsyncSpace(Predicate<Integer> predicate,
|
|
BiConsumer<Integer, Integer> biConsumer, Consumer<Exception> consumer) {
|
|
try (ProcFileReader mReader = new ProcFileReader(new FileInputStream(mPath))) {
|
|
while (mReader.hasMoreData()) {
|
|
// find the next process
|
|
if (!mReader.nextString().equals("proc")) {
|
|
mReader.finishLine();
|
|
continue;
|
|
}
|
|
|
|
// read pid
|
|
int pid = mReader.nextInt();
|
|
mReader.finishLine();
|
|
|
|
// check if we have interest in this process
|
|
if (!predicate.test(pid)) {
|
|
continue;
|
|
}
|
|
|
|
// read free async space
|
|
mReader.finishLine(); // context binder
|
|
mReader.finishLine(); // threads:
|
|
mReader.finishLine(); // requested threads:
|
|
mReader.finishLine(); // ready threads
|
|
if (!mReader.nextString().equals("free")) {
|
|
mReader.finishLine();
|
|
continue;
|
|
}
|
|
if (!mReader.nextString().equals("async")) {
|
|
mReader.finishLine();
|
|
continue;
|
|
}
|
|
if (!mReader.nextString().equals("space")) {
|
|
mReader.finishLine();
|
|
continue;
|
|
}
|
|
int free = mReader.nextInt();
|
|
mReader.finishLine();
|
|
biConsumer.accept(pid, free);
|
|
}
|
|
} catch (IOException | NumberFormatException e) {
|
|
consumer.accept(e);
|
|
}
|
|
}
|
|
}
|