Abort running compiler dispatcher tasks under memory pressure

src/compiler-dispatcher/compiler-dispatcher.h

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_COMPILER_DISPATCHER_COMPILER_DISPATCHER_H_
 #define V8_COMPILER_DISPATCHER_COMPILER_DISPATCHER_H_
 
 #include <map>
 #include <memory>
 #include <unordered_set>
 #include <utility>
 
 #include "src/base/atomic-utils.h"
 #include "src/base/macros.h"
 #include "src/base/platform/condition-variable.h"
 #include "src/base/platform/mutex.h"
 #include "src/base/platform/semaphore.h"
 #include "src/globals.h"
 #include "testing/gtest/include/gtest/gtest_prod.h"
 
 namespace v8 {
 
 class Platform;
+enum class MemoryPressureLevel;
 
 namespace internal {
 
 class CancelableTaskManager;
 class CompilerDispatcherJob;
 class CompilerDispatcherTracer;
 class Isolate;
 class SharedFunctionInfo;
 
 template <typename T>
@@ skipping 42 matching lines @@
   // Blocks until the given function is compiled (and does so as fast as
   // possible). Returns true if the compile job was succesful.
   bool FinishNow(Handle<SharedFunctionInfo> function);
 
   // Aborts a given job. Blocks if requested.
   void Abort(Handle<SharedFunctionInfo> function, BlockingBehavior blocking);
 
   // Aborts all jobs. Blocks if requested.
   void AbortAll(BlockingBehavior blocking);
 
+  // Memory pressure notifications from the embedder.
+  void MemoryPressureNotification(v8::MemoryPressureLevel level,
+                                  bool is_isolate_locked);
+
  private:
   FRIEND_TEST(CompilerDispatcherTest, IdleTaskSmallIdleTime);
   FRIEND_TEST(IgnitionCompilerDispatcherTest, CompileOnBackgroundThread);
   FRIEND_TEST(IgnitionCompilerDispatcherTest, FinishNowWithBackgroundTask);
   FRIEND_TEST(IgnitionCompilerDispatcherTest,
               AsyncAbortAllPendingBackgroundTask);
   FRIEND_TEST(IgnitionCompilerDispatcherTest,
               AsyncAbortAllRunningBackgroundTask);
   FRIEND_TEST(IgnitionCompilerDispatcherTest, FinishNowDuringAbortAll);
 
@@ skipping 20 matching lines @@
   Platform* platform_;
   size_t max_stack_size_;
   std::unique_ptr<CompilerDispatcherTracer> tracer_;
 
   std::unique_ptr<CancelableTaskManager> task_manager_;
 
   // Mapping from (script id, function literal id) to job. We use a multimap,
   // as script id is not necessarily unique.
   JobMap jobs_;
 
+  base::AtomicValue<v8::MemoryPressureLevel> memory_pressure_level_;
+
   // The following members can be accessed from any thread. Methods need to hold
   // the mutex |mutex_| while accessing them.
   base::Mutex mutex_;
 
   // True if the dispatcher is in the process of aborting running tasks.
   bool abort_;
 
   bool idle_task_scheduled_;
 
   // Number of currently scheduled BackgroundTask objects.
@@ skipping 15 matching lines @@
   base::AtomicValue<bool> block_for_testing_;
   base::Semaphore semaphore_for_testing_;
 
   DISALLOW_COPY_AND_ASSIGN(CompilerDispatcher);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_DISPATCHER_COMPILER_DISPATCHER_H_