| // Copyright 2021 The Bazel Authors. All rights reserved. |
| // |
| // 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.google.devtools.build.lib.runtime; |
| |
| import com.google.common.collect.ImmutableList; |
| import com.google.common.eventbus.EventBus; |
| import com.google.common.eventbus.Subscribe; |
| import com.google.devtools.build.lib.analysis.BlazeDirectories; |
| import com.google.devtools.build.lib.runtime.MemoryPressure.MemoryPressureStats; |
| import com.google.devtools.build.lib.skyframe.HighWaterMarkLimiter; |
| import com.google.devtools.common.options.OptionsBase; |
| import com.google.errorprone.annotations.Keep; |
| |
| /** |
| * A {@link BlazeModule} that installs a {@link MemoryPressureListener} that reacts to memory |
| * pressure events. |
| */ |
| public final class MemoryPressureModule extends BlazeModule { |
| private RetainedHeapLimiter retainedHeapLimiter; |
| private MemoryPressureListener memoryPressureListener; |
| private HighWaterMarkLimiter highWaterMarkLimiter; |
| private EventBus eventBus; |
| |
| @Override |
| public void workspaceInit( |
| BlazeRuntime runtime, BlazeDirectories directories, WorkspaceBuilder builder) { |
| retainedHeapLimiter = RetainedHeapLimiter.create(runtime.getBugReporter()); |
| memoryPressureListener = MemoryPressureListener.create(retainedHeapLimiter); |
| } |
| |
| @Override |
| public ImmutableList<Class<? extends OptionsBase>> getCommandOptions(Command command) { |
| return ImmutableList.of(MemoryPressureOptions.class); |
| } |
| |
| @Override |
| public void beforeCommand(CommandEnvironment env) { |
| eventBus = env.getEventBus(); |
| memoryPressureListener.setEventBus(eventBus); |
| |
| MemoryPressureOptions options = env.getOptions().getOptions(MemoryPressureOptions.class); |
| highWaterMarkLimiter = |
| new HighWaterMarkLimiter(env.getSkyframeExecutor(), env.getSyscallCache(), options); |
| GcThrashingDetector.configureForCommand(options, eventBus); |
| retainedHeapLimiter.setOptions(options); |
| |
| eventBus.register(this); |
| eventBus.register(highWaterMarkLimiter); |
| } |
| |
| @Override |
| public void afterCommand() { |
| postStats(); |
| memoryPressureListener.setEventBus(null); |
| eventBus = null; |
| highWaterMarkLimiter = null; |
| } |
| |
| @Subscribe |
| @Keep |
| void onCrash(@SuppressWarnings("unused") CrashEvent event) { |
| postStats(); |
| } |
| |
| private void postStats() { |
| MemoryPressureStats.Builder stats = MemoryPressureStats.newBuilder(); |
| retainedHeapLimiter.addStatsAndReset(stats); |
| highWaterMarkLimiter.addStatsAndReset(stats); |
| eventBus.post(stats.build()); |
| } |
| } |