Add memory pressure interrupt for memory pressure notification

src/execution.cc

Index: src/execution.cc
diff --git a/src/execution.cc b/src/execution.cc
index e6a569f33d967d66bdfc0065ef10c7117a3a091a..2558d8c946426b196ed1bf7c158151fdcff6079a 100644
--- a/src/execution.cc
+++ b/src/execution.cc
@@ -452,8 +452,13 @@ Object* StackGuard::HandleInterrupts() {
     isolate_->heap()->MonotonicallyIncreasingTimeInMs();
   }
 
-  if (CheckAndClearInterrupt(GC_REQUEST)) {
-    isolate_->heap()->HandleGCRequest();
+  if (CheckAndClearInterrupt(MEMORY_PRESSURE_INTERRUPT)) {
+    isolate_->heap()->CollectAllAvailableGarbage("low memory notification");
+    CheckAndClearInterrupt(GC_REQUEST);
+  } else {
+    if (CheckAndClearInterrupt(GC_REQUEST)) {
+      isolate_->heap()->HandleGCRequest();
+    }
   }
 
   if (CheckDebugBreak() || CheckDebugCommand()) {
@@ -485,5 +490,13 @@ Object* StackGuard::HandleInterrupts() {
   return isolate_->heap()->undefined_value();
 }
 
+bool StackGuard::NeedMemoryPressureGC() {
+  return CheckInterrupt(MEMORY_PRESSURE_INTERRUPT);
+}
+
+void StackGuard::MemoryPressureGCDone() {
+  CheckAndClearInterrupt(MEMORY_PRESSURE_INTERRUPT);
+}
+
 }  // namespace internal
 }  // namespace v8