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Introduce top-down action caching in Bazel. The top-down cache may be…
… provided by a Bazel module. The cache works by first computing a _transitive_ cache key for the action, known as a sketch. It composes the action keys for all dependent actions and all transitive source file digest hashes. This feature is not currently wired up for use - consider it extremely experimental at this point. RELNOTES: None PiperOrigin-RevId: 260973078
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21 changes: 21 additions & 0 deletions
21
src/main/java/com/google/devtools/build/lib/actionsketch/BUILD
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,21 @@ | ||
| package( | ||
| default_visibility = ["//src:__subpackages__"], | ||
| ) | ||
|
|
||
| filegroup( | ||
| name = "srcs", | ||
| srcs = glob(["**"]), | ||
| ) | ||
|
|
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| java_library( | ||
| name = "action_sketch", | ||
| srcs = glob(["*.java"]), | ||
| deps = [ | ||
| "//src/main/java/com/google/devtools/build/lib/actions", | ||
| "//src/main/java/com/google/devtools/build/skyframe:skyframe-objects", | ||
| "//third_party:auto_value", | ||
| "//third_party:guava", | ||
| "//third_party:jsr305", | ||
| "//third_party/protobuf:protobuf_java", | ||
| ], | ||
| ) |
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142 changes: 142 additions & 0 deletions
142
src/main/java/com/google/devtools/build/lib/skyframe/ActionSketchFunction.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,142 @@ | ||
| // Copyright 2019 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.skyframe; | ||
|
|
||
| import com.google.common.cache.CacheBuilder; | ||
| import com.google.common.cache.CacheLoader; | ||
| import com.google.common.cache.LoadingCache; | ||
| import com.google.devtools.build.lib.actions.Action; | ||
| import com.google.devtools.build.lib.actions.ActionKeyContext; | ||
| import com.google.devtools.build.lib.actions.ActionLookupData; | ||
| import com.google.devtools.build.lib.actions.ActionLookupValue; | ||
| import com.google.devtools.build.lib.actions.Artifact; | ||
| import com.google.devtools.build.lib.actions.Artifact.DerivedArtifact; | ||
| import com.google.devtools.build.lib.actions.FileArtifactValue; | ||
| import com.google.devtools.build.lib.actionsketch.ActionSketch; | ||
| import com.google.devtools.build.lib.actionsketch.Sketches; | ||
| import com.google.devtools.build.lib.concurrent.BlazeInterners; | ||
| import com.google.devtools.build.lib.skyframe.serialization.autocodec.AutoCodec; | ||
| import com.google.devtools.build.lib.util.BigIntegerFingerprintUtils; | ||
| import com.google.devtools.build.skyframe.AbstractSkyKey; | ||
| import com.google.devtools.build.skyframe.SkyFunction; | ||
| import com.google.devtools.build.skyframe.SkyFunctionName; | ||
| import com.google.devtools.build.skyframe.SkyKey; | ||
| import com.google.devtools.build.skyframe.SkyValue; | ||
| import java.math.BigInteger; | ||
| import java.util.ArrayList; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
| import javax.annotation.Nullable; | ||
|
|
||
| /** | ||
| * {@link ActionSketchFunction} computes an {@link ActionSketch} for the given Action. This is a | ||
| * transitive hash of the dependent action keys and source file content hashes. | ||
| */ | ||
| public final class ActionSketchFunction implements SkyFunction { | ||
| private final ActionKeyContext actionKeyContext; | ||
|
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| public ActionSketchFunction(ActionKeyContext actionKeyContext) { | ||
| this.actionKeyContext = actionKeyContext; | ||
| } | ||
|
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| public static SketchKey key(ActionLookupData key) { | ||
| return SketchKey.create(key); | ||
| } | ||
|
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| @AutoCodec.VisibleForSerialization | ||
| @AutoCodec | ||
| static class SketchKey extends AbstractSkyKey<ActionLookupData> { | ||
| private static final LoadingCache<ActionLookupData, SketchKey> keyCache = | ||
| CacheBuilder.newBuilder() | ||
| .weakKeys() | ||
| .concurrencyLevel(BlazeInterners.concurrencyLevel()) | ||
| .build(CacheLoader.from(SketchKey::new)); | ||
|
|
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| private SketchKey(ActionLookupData arg) { | ||
| super(arg); | ||
| } | ||
|
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| @AutoCodec.VisibleForSerialization | ||
| @AutoCodec.Instantiator | ||
| static SketchKey create(ActionLookupData arg) { | ||
| return keyCache.getUnchecked(arg); | ||
| } | ||
|
|
||
| @Override | ||
| public SkyFunctionName functionName() { | ||
| return SkyFunctions.ACTION_SKETCH; | ||
| } | ||
| } | ||
|
|
||
| @Nullable | ||
| @Override | ||
| public String extractTag(SkyKey skyKey) { | ||
| return null; | ||
| } | ||
|
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| @Nullable | ||
| @Override | ||
| public SkyValue compute(SkyKey skyKey, Environment env) throws InterruptedException { | ||
| ActionLookupData actionLookupData = (ActionLookupData) skyKey.argument(); | ||
| ActionLookupValue actionLookupValue = | ||
| ArtifactFunction.getActionLookupValue(actionLookupData.getActionLookupKey(), env); | ||
| if (actionLookupValue == null) { | ||
| return null; | ||
| } | ||
|
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| Action action = actionLookupValue.getAction(actionLookupData.getActionIndex()); | ||
| List<Artifact> srcArtifacts = new ArrayList<>(); | ||
| List<SketchKey> depActions = new ArrayList<>(); | ||
| for (Artifact artifact : action.getInputs()) { | ||
| if (artifact.isSourceArtifact()) { | ||
| srcArtifacts.add(artifact); | ||
| } else { | ||
| depActions.add(SketchKey.create(((DerivedArtifact) artifact).getGeneratingActionKey())); | ||
| } | ||
| } | ||
|
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| Map<SkyKey, SkyValue> srcArtifactValues = env.getValues(srcArtifacts); | ||
| Map<SkyKey, SkyValue> depSketchValues = env.getValues(depActions); | ||
| if (env.valuesMissing()) { | ||
| return null; | ||
| } | ||
|
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| BigInteger transitiveActionKeyHash = Sketches.computeActionKey(action, actionKeyContext); | ||
| BigInteger transitiveSourceHash = BigInteger.ZERO; | ||
|
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| // Incorporate the direct source values. | ||
| for (SkyValue val : srcArtifactValues.values()) { | ||
| FileArtifactValue fileArtifactValue = (FileArtifactValue) val; | ||
| transitiveSourceHash = | ||
| BigIntegerFingerprintUtils.compose( | ||
| transitiveSourceHash, fileArtifactValue.getValueFingerprint()); | ||
| } | ||
|
|
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| // Incorporate the transitive action key and source values. | ||
| for (SkyValue sketchVal : depSketchValues.values()) { | ||
| ActionSketch depSketch = (ActionSketch) sketchVal; | ||
| transitiveActionKeyHash = | ||
| BigIntegerFingerprintUtils.compose( | ||
| transitiveActionKeyHash, depSketch.transitiveActionLookupHash()); | ||
| transitiveSourceHash = | ||
| BigIntegerFingerprintUtils.compose( | ||
| transitiveSourceHash, depSketch.transitiveSourceHash()); | ||
| } | ||
|
|
||
| return ActionSketch.builder() | ||
| .setTransitiveActionLookupHash(transitiveActionKeyHash) | ||
| .setTransitiveSourceHash(transitiveSourceHash) | ||
| .build(); | ||
| } | ||
| } |
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