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authorMike Lockwood <lockwood@google.com>2013-08-28 09:44:17 -0700
committerMike Lockwood <lockwood@google.com>2013-08-28 09:44:17 -0700
commit9f6a119c8aa276432ece4fe2118bd8a3c9b1067e (patch)
tree1391656f9ad624aa99d4c7d2880d38121801a424 /tools/preload/WritePreloadedClassFile.java
parent647b6f5ed276bf93d95e5801e5e8af2802ef5fbb (diff)
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Move frameworks/base/tools/ to frameworks/tools/
Change-Id: I3ffafdab27cc4aca256c3a5806b630795b75d5c8
Diffstat (limited to 'tools/preload/WritePreloadedClassFile.java')
-rw-r--r--tools/preload/WritePreloadedClassFile.java155
1 files changed, 0 insertions, 155 deletions
diff --git a/tools/preload/WritePreloadedClassFile.java b/tools/preload/WritePreloadedClassFile.java
deleted file mode 100644
index b067bc2..0000000
--- a/tools/preload/WritePreloadedClassFile.java
+++ /dev/null
@@ -1,155 +0,0 @@
-/*
- * Copyright (C) 2008 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.
- */
-
-import java.io.BufferedWriter;
-import java.io.FileOutputStream;
-import java.io.IOException;
-import java.io.OutputStreamWriter;
-import java.io.Writer;
-import java.nio.charset.Charset;
-import java.util.Set;
-import java.util.TreeSet;
-
-/**
- * Writes /frameworks/base/preloaded-classes. Also updates
- * {@link LoadedClass#preloaded} fields and writes over compiled log file.
- */
-public class WritePreloadedClassFile {
-
- /**
- * Preload any class that take longer to load than MIN_LOAD_TIME_MICROS us.
- */
- static final int MIN_LOAD_TIME_MICROS = 1250;
-
- /**
- * Preload any class that was loaded by at least MIN_PROCESSES processes.
- */
- static final int MIN_PROCESSES = 10;
-
- public static void main(String[] args) throws IOException,
- ClassNotFoundException {
- if (args.length != 1) {
- System.err.println("Usage: WritePreloadedClassFile [compiled log]");
- System.exit(-1);
- }
- String rootFile = args[0];
- Root root = Root.fromFile(rootFile);
-
- // No classes are preloaded to start.
- for (LoadedClass loadedClass : root.loadedClasses.values()) {
- loadedClass.preloaded = false;
- }
-
- // Open preloaded-classes file for output.
- Writer out = new BufferedWriter(new OutputStreamWriter(
- new FileOutputStream(Policy.PRELOADED_CLASS_FILE),
- Charset.forName("US-ASCII")));
-
- out.write("# Classes which are preloaded by"
- + " com.android.internal.os.ZygoteInit.\n");
- out.write("# Automatically generated by frameworks/base/tools/preload/"
- + WritePreloadedClassFile.class.getSimpleName() + ".java.\n");
- out.write("# MIN_LOAD_TIME_MICROS=" + MIN_LOAD_TIME_MICROS + "\n");
- out.write("# MIN_PROCESSES=" + MIN_PROCESSES + "\n");
-
- /*
- * The set of classes to preload. We preload a class if:
- *
- * a) it's loaded in the bootclasspath (i.e., is a system class)
- * b) it takes > MIN_LOAD_TIME_MICROS us to load, and
- * c) it's loaded by more than one process, or it's loaded by an
- * application (i.e., not a long running service)
- */
- Set<LoadedClass> toPreload = new TreeSet<LoadedClass>();
-
- // Preload classes that were loaded by at least 2 processes. Hopefully,
- // the memory associated with these classes will be shared.
- for (LoadedClass loadedClass : root.loadedClasses.values()) {
- Set<String> names = loadedClass.processNames();
- if (!Policy.isPreloadable(loadedClass)) {
- continue;
- }
-
- if (names.size() >= MIN_PROCESSES ||
- (loadedClass.medianTimeMicros() > MIN_LOAD_TIME_MICROS && names.size() > 1)) {
- toPreload.add(loadedClass);
- }
- }
-
- int initialSize = toPreload.size();
- System.out.println(initialSize
- + " classses were loaded by more than one app.");
-
- // Preload eligable classes from applications (not long-running
- // services).
- for (Proc proc : root.processes.values()) {
- if (proc.fromZygote() && !Policy.isService(proc.name)) {
- for (Operation operation : proc.operations) {
- LoadedClass loadedClass = operation.loadedClass;
- if (shouldPreload(loadedClass)) {
- toPreload.add(loadedClass);
- }
- }
- }
- }
-
- System.out.println("Added " + (toPreload.size() - initialSize)
- + " more to speed up applications.");
-
- System.out.println(toPreload.size()
- + " total classes will be preloaded.");
-
- // Make classes that were implicitly loaded by the zygote explicit.
- // This adds minimal overhead but avoid confusion about classes not
- // appearing in the list.
- addAllClassesFrom("zygote", root, toPreload);
-
- for (LoadedClass loadedClass : toPreload) {
- out.write(loadedClass.name + "\n");
- }
-
- out.close();
-
- // Update data to reflect LoadedClass.preloaded changes.
- for (LoadedClass loadedClass : toPreload) {
- loadedClass.preloaded = true;
- }
- root.toFile(rootFile);
- }
-
- private static void addAllClassesFrom(String processName, Root root,
- Set<LoadedClass> toPreload) {
- for (Proc proc : root.processes.values()) {
- if (proc.name.equals(processName)) {
- for (Operation operation : proc.operations) {
- boolean preloadable
- = Policy.isPreloadable(operation.loadedClass);
- if (preloadable) {
- toPreload.add(operation.loadedClass);
- }
- }
- }
- }
- }
-
- /**
- * Returns true if the class should be preloaded.
- */
- private static boolean shouldPreload(LoadedClass clazz) {
- return Policy.isPreloadable(clazz)
- && clazz.medianTimeMicros() > MIN_LOAD_TIME_MICROS;
- }
-}