Remove eager sweeping for lazy swept spaces. Try to find in SlowAllocateRaw a bounded number of tim…

src/spaces.cc

Index: src/spaces.cc
diff --git a/src/spaces.cc b/src/spaces.cc
index 0ac23d279db6d5c13e3d9b0b67206cdd7f983ce0..cacd9691501c10428a7a2b97d3a810cfd683789a 100644
--- a/src/spaces.cc
+++ b/src/spaces.cc
@@ -2391,10 +2391,13 @@ void PagedSpace::EvictEvacuationCandidatesFromFreeLists() {
 HeapObject* PagedSpace::SlowAllocateRaw(int size_in_bytes) {
   // Allocation in this space has failed.
 
-  // If there are unswept pages advance lazy sweeper then sweep one page before
-  // allocating a new page.
-  if (first_unswept_page_->is_valid()) {
-    AdvanceSweeper(size_in_bytes);
+  // If there are unswept pages advance lazy sweeper a bounded number of times
+  // until we find a size_in_bytes contiguous piece of memory
+  const int kMaxSweepingTries = 5;
+  bool sweeping_complete = false;
+
+  for (int i = 0; i < kMaxSweepingTries && !sweeping_complete; i++) {
+    sweeping_complete = AdvanceSweeper(size_in_bytes);
 
     // Retry the free list allocation.
     HeapObject* object = free_list_.Allocate(size_in_bytes);