Track how many pages trigger fallback strategies in GC

R=hpayer@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1029323003

Cr-Commit-Position: refs/heads/master@{#27421}

include/v8.h

@@ -5073,7 +5073,7 @@ class V8_EXPORT Isolate {
   };
 
   /**
-   * Features reported via the SetUseCounterCallback callback. Do not chang
+   * Features reported via the SetUseCounterCallback callback. Do not change
    * assigned numbers of existing items; add new features to the end of this
    * list.
    */
@@ -5081,6 +5081,9 @@ class V8_EXPORT Isolate {
     kUseAsm = 0,
     kBreakIterator = 1,
     kLegacyConst = 2,
+    kMarkDequeOverflow = 3,
+    kStoreBufferOverflow = 4,
+    kSlotsBufferOverflow = 5,
     kUseCounterFeatureCount  // This enum value must be last.
   };
 

src/heap/mark-compact.cc

@@ -2041,6 +2041,7 @@ void MarkCompactCollector::EmptyMarkingDeque() {
 // overflowed objects in the heap so the overflow flag on the markings stack
 // is cleared.
 void MarkCompactCollector::RefillMarkingDeque() {
+  isolate()->CountUsage(v8::Isolate::UseCounterFeature::kMarkDequeOverflow);
   DCHECK(marking_deque_.overflowed());
 
   DiscoverGreyObjectsInNewSpace(heap(), &marking_deque_);
@@ -4529,6 +4530,30 @@ void MarkCompactCollector::RecordRelocSlot(RelocInfo* rinfo, Object* target) {
 }
 
 
+void MarkCompactCollector::EvictEvacuationCandidate(Page* page) {
+  if (FLAG_trace_fragmentation) {
+    PrintF("Page %p is too popular. Disabling evacuation.\n",
+           reinterpret_cast<void*>(page));
+  }
+
+  isolate()->CountUsage(v8::Isolate::UseCounterFeature::kSlotsBufferOverflow);
+
+  // TODO(gc) If all evacuation candidates are too popular we
+  // should stop slots recording entirely.
+  page->ClearEvacuationCandidate();
+
+  // We were not collecting slots on this page that point
+  // to other evacuation candidates thus we have to
+  // rescan the page after evacuation to discover and update all
+  // pointers to evacuated objects.
+  if (page->owner()->identity() == OLD_DATA_SPACE) {
+    evacuation_candidates_.RemoveElement(page);
+  } else {
+    page->SetFlag(Page::RESCAN_ON_EVACUATION);
+  }
+}
+
+
 void MarkCompactCollector::RecordCodeEntrySlot(Address slot, Code* target) {
   Page* target_page = Page::FromAddress(reinterpret_cast<Address>(target));
   if (target_page->IsEvacuationCandidate() &&

src/heap/mark-compact.h

@@ -589,27 +589,6 @@ class MarkCompactCollector {
         ->IsEvacuationCandidate();
   }
 
-  INLINE(void EvictEvacuationCandidate(Page* page)) {
-    if (FLAG_trace_fragmentation) {
-      PrintF("Page %p is too popular. Disabling evacuation.\n",
-             reinterpret_cast<void*>(page));
-    }
-
-    // TODO(gc) If all evacuation candidates are too popular we
-    // should stop slots recording entirely.
-    page->ClearEvacuationCandidate();
-
-    // We were not collecting slots on this page that point
-    // to other evacuation candidates thus we have to
-    // rescan the page after evacuation to discover and update all
-    // pointers to evacuated objects.
-    if (page->owner()->identity() == OLD_DATA_SPACE) {
-      evacuation_candidates_.RemoveElement(page);
-    } else {
-      page->SetFlag(Page::RESCAN_ON_EVACUATION);
-    }
-  }
-
   void RecordRelocSlot(RelocInfo* rinfo, Object* target);
   void RecordCodeEntrySlot(Address slot, Code* target);
   void RecordCodeTargetPatch(Address pc, Code* target);
@@ -694,6 +673,7 @@ class MarkCompactCollector {
   bool WillBeDeoptimized(Code* code);
   void RemoveDeadInvalidatedCode();
   void ProcessInvalidatedCode(ObjectVisitor* visitor);
+  void EvictEvacuationCandidate(Page* page);
 
   void StartSweeperThreads();
 

src/heap/store-buffer.cc

@@ -197,6 +197,8 @@ void StoreBuffer::ExemptPopularPages(int prime_sample_step, int threshold) {
   }
   if (created_new_scan_on_scavenge_pages) {
     Filter(MemoryChunk::SCAN_ON_SCAVENGE);
+    heap_->isolate()->CountUsage(
+        v8::Isolate::UseCounterFeature::kStoreBufferOverflow);
   }
   old_buffer_is_filtered_ = true;
 }