Collect only optimizable function samples....

src/compiler.cc

 // 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 98 matching lines @@
   }
 #else
   return FLAG_always_full_compiler;
 #endif
 }
 
 
 static void FinishOptimization(Handle<JSFunction> function, int64_t start) {
   int opt_count = function->shared()->opt_count();
   function->shared()->set_opt_count(opt_count + 1);
-  if (!FLAG_trace_opt) return;
+  double ms = static_cast<double>(OS::Ticks() - start) / 1000;
+  if (FLAG_trace_opt) {
+    PrintF("[optimizing: ");
+    function->PrintName();
+    PrintF(" / %" V8PRIxPTR, reinterpret_cast<intptr_t>(*function));
+    PrintF(" - took %0.3f ms]\n", ms);
+  }
+  if (FLAG_trace_opt_stats) {
+    static double compilation_time = 0.0;
+    static int compiled_functions = 0;
+    static int code_size = 0;
 
-  double ms = static_cast<double>(OS::Ticks() - start) / 1000;
-  PrintF("[optimizing: ");
-  function->PrintName();
-  PrintF(" / %" V8PRIxPTR, reinterpret_cast<intptr_t>(*function));
-  PrintF(" - took %0.3f ms]\n", ms);
+    compilation_time += ms;
+    compiled_functions++;
+    code_size += function->shared()->SourceSize();
+    PrintF("Compiled: %d functions with %d byte source size in %fms.\n",
+           compiled_functions,
+           code_size,
+           compilation_time);
+  }
 }
 
 
 static void AbortAndDisable(CompilationInfo* info) {
   // Disable optimization for the shared function info and mark the
   // code as non-optimizable. The marker on the shared function info
   // is there because we flush non-optimized code thereby loosing the
   // non-optimizable information for the code. When the code is
   // regenerated and set on the shared function info it is marked as
   // non-optimizable if optimization is disabled for the shared
@@ skipping 619 matching lines @@
                               *code,
                               *name));
       OPROFILE(CreateNativeCodeRegion(*name,
                                       code->instruction_start(),
                                       code->instruction_size()));
     }
   }
 }
 
 } }  // namespace v8::internal