[heap] Start sweeper tasks after evacuation.

src/heap/spaces.cc

Index: src/heap/spaces.cc
diff --git a/src/heap/spaces.cc b/src/heap/spaces.cc
index 9d5ac8ca4a46ecc7c88d0a066277952659e9ebe3..c3c418eccadbee3926918a40a448c285aac83bae 100644
--- a/src/heap/spaces.cc
+++ b/src/heap/spaces.cc
@@ -398,8 +398,11 @@ bool MemoryAllocator::CanFreeMemoryChunk(MemoryChunk* chunk) {
   // We cannot free memory chunks in new space while the sweeper is running
   // since a sweeper thread might be stuck right before trying to lock the
   // corresponding page.
+
+  // Chunks in old generation are unmapped if they are empty.
+  DCHECK(chunk->InNewSpace() || chunk->SweepingDone());
   return !chunk->InNewSpace() || (mc == nullptr) || !FLAG_concurrent_sweeping ||
-         mc->sweeper().IsSweepingCompleted();
+         chunk->SweepingDone();

[Michael Lippautz, 2016/10/18 16:02:39]

I think (mc == nullptr) can go.

[ulan, 2016/10/18 16:07:05]

Done.

 }
 
 bool MemoryAllocator::CommitMemory(Address base, size_t size,