Report store buffer overflows to v8 counters.

src/store-buffer.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 103 matching lines @@
   delete[] hash_set_1_;
   delete[] hash_set_2_;
   old_start_ = old_top_ = old_limit_ = old_reserved_limit_ = NULL;
   start_ = limit_ = NULL;
   heap_->public_set_store_buffer_top(start_);
 }
 
 
 void StoreBuffer::StoreBufferOverflow(Isolate* isolate) {
   isolate->heap()->store_buffer()->Compact();
+  isolate->counters()->store_buffer_overflows()->Increment();
 }
 
 
 void StoreBuffer::Uniq() {
   // Remove adjacent duplicates and cells that do not point at new space.
   Address previous = NULL;
   Address* write = old_start_;
   ASSERT(may_move_store_buffer_entries_);
   for (Address* read = old_start_; read < old_top_; read++) {
     Address current = *read;
@@ skipping 552 matching lines @@
     }
     old_buffer_is_sorted_ = false;
     old_buffer_is_filtered_ = false;
     *old_top_++ = reinterpret_cast<Address>(int_addr << kPointerSizeLog2);
     ASSERT(old_top_ <= old_limit_);
   }
   heap_->isolate()->counters()->store_buffer_compactions()->Increment();
 }
 
 } }  // namespace v8::internal