Add support for compacting the write buffer.

src/v8-counters.h

 // Copyright 2010 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 10 matching lines @@
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #ifndef V8_V8_COUNTERS_H_
 #define V8_V8_COUNTERS_H_
 
+#include "allocation.h"
 #include "counters.h"
+#include "v8globals.h"
 
 namespace v8 {
 namespace internal {
 
 #define HISTOGRAM_TIMER_LIST(HT)                                      \
   /* Garbage collection timers. */                                    \
   HT(gc_compactor, V8.GCCompactor)                                    \
   HT(gc_scavenger, V8.GCScavenger)                                    \
   HT(gc_context, V8.GCContext) /* GC context cleanup time */          \
   /* Parsing timers. */                                               \
@@ skipping 56 matching lines @@
   /* Amount of source code compiled with the old codegen. */          \
   SC(total_old_codegen_source_size, V8.TotalOldCodegenSourceSize)     \
   /* Amount of source code compiled with the full codegen. */         \
   SC(total_full_codegen_source_size, V8.TotalFullCodegenSourceSize)   \
   /* Number of contexts created from scratch. */                      \
   SC(contexts_created_from_scratch, V8.ContextsCreatedFromScratch)    \
   /* Number of contexts created by partial snapshot. */               \
   SC(contexts_created_by_snapshot, V8.ContextsCreatedBySnapshot)      \
   /* Number of code objects found from pc. */                         \
   SC(pc_to_code, V8.PcToCode)                                         \
-  SC(pc_to_code_cached, V8.PcToCodeCached)
+  SC(pc_to_code_cached, V8.PcToCodeCached)                            \
+  /* The write-buffer implementation of the write barrier. */         \
+  SC(write_buffer_compactions, V8.WriteBufferCompactions)             \
+  SC(write_buffer_overflows, V8.WriteBufferOverflows)
 
 
 #define STATS_COUNTER_LIST_2(SC)                                      \
   /* Number of code stubs. */                                         \
   SC(code_stubs, V8.CodeStubs)                                        \
   /* Amount of stub code. */                                          \
   SC(total_stubs_code_size, V8.TotalStubsCodeSize)                    \
   /* Amount of (JS) compiled code. */                                 \
   SC(total_compiled_code_size, V8.TotalCompiledCodeSize)              \
   SC(gc_compactor_caused_by_request, V8.GCCompactorCausedByRequest)   \
@@ skipping 159 matching lines @@
     stats_counter_count
   };
 
   // Sliding state window counters.
   static StatsCounter state_counters[];
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_V8_COUNTERS_H_