Add memory pressure interrupt for memory pressure notification

src/api.cc

 // Copyright 2012 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.
 
 #include "src/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 7135 matching lines @@
   isolate->stack_guard()->ClearTerminateExecution();
   isolate->CancelTerminateExecution();
 }
 
 
 void Isolate::RequestInterrupt(InterruptCallback callback, void* data) {
   i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
   isolate->RequestInterrupt(callback, data);
 }
 
+void Isolate::RequestMemoryPressureInterrupt() {
+  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
+  isolate->RequestMemoryPressureInterrupt();
+}
 
 void Isolate::RequestGarbageCollectionForTesting(GarbageCollectionType type) {
   CHECK(i::FLAG_expose_gc);
   if (type == kMinorGarbageCollection) {
     reinterpret_cast<i::Isolate*>(this)->heap()->CollectGarbage(
         i::NEW_SPACE, "Isolate::RequestGarbageCollection",
         kGCCallbackFlagForced);
   } else {
     DCHECK_EQ(kFullGarbageCollection, type);
     reinterpret_cast<i::Isolate*>(this)->heap()->CollectAllGarbage(
@@ skipping 404 matching lines @@
 void Isolate::LowMemoryNotification() {
   i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
   {
     i::HistogramTimerScope idle_notification_scope(
         isolate->counters()->gc_low_memory_notification());
     TRACE_EVENT0("v8", "V8.GCLowMemoryNotification");
     isolate->heap()->CollectAllAvailableGarbage("low memory notification");
   }
 }
 
+void Isolate::GCNotificationBasedOnMemoryPressureInterrupt() {
+  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
+  {
+    i::HistogramTimerScope idle_notification_scope(
+        isolate->counters()->gc_low_memory_notification());
+    if (isolate->stack_guard()->NeedMemoryPressureGC()) {
+      TRACE_EVENT0("v8", "V8.GCLowMemoryNotification");
+      isolate->heap()->CollectAllAvailableGarbage("low memory notification");
+      isolate->stack_guard()->MemoryPressureGCDone();
+    }
+  }
+}
 
 int Isolate::ContextDisposedNotification(bool dependant_context) {
   i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
   return isolate->heap()->NotifyContextDisposed(dependant_context);
 }
 
 
 void Isolate::IsolateInForegroundNotification() {
   i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
   return isolate->heap()->SetOptimizeForLatency();
@@ skipping 1104 matching lines @@
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 }  // namespace internal
 }  // namespace v8