Adding 'isolates' argument to LOG to get rid of multiple TLS fetches in profiling.

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 416 matching lines @@
       isolate->factory()->NewSharedFunctionInfo(
           lit->name(),
           lit->materialized_literal_count(),
           info->code(),
           SerializedScopeInfo::Create(info->scope()));
 
   ASSERT_EQ(RelocInfo::kNoPosition, lit->function_token_position());
   Compiler::SetFunctionInfo(result, lit, true, script);
 
   if (script->name()->IsString()) {
-    PROFILE(CodeCreateEvent(
+    PROFILE(isolate, CodeCreateEvent(
         info->is_eval()
             ? Logger::EVAL_TAG
             : Logger::ToNativeByScript(Logger::SCRIPT_TAG, *script),
         *info->code(),
         *result,
         String::cast(script->name())));
     GDBJIT(AddCode(Handle<String>(String::cast(script->name())),
                    script,
                    info->code()));
   } else {
-    PROFILE(CodeCreateEvent(
+    PROFILE(isolate, CodeCreateEvent(
         info->is_eval()
             ? Logger::EVAL_TAG
             : Logger::ToNativeByScript(Logger::SCRIPT_TAG, *script),
         *info->code(),
         *result,
         isolate->heap()->empty_string()));
     GDBJIT(AddCode(Handle<String>(), script, info->code()));
   }
 
   // Hint to the runtime system used when allocating space for initial
@@ skipping 340 matching lines @@
   // script name and line number. Check explicitly whether logging is
   // enabled as finding the line number is not free.
   if (info->isolate()->logger()->is_logging() || CpuProfiler::is_profiling()) {
     Handle<Script> script = info->script();
     Handle<Code> code = info->code();
     if (*code == info->isolate()->builtins()->builtin(Builtins::LazyCompile))
       return;
     if (script->name()->IsString()) {
       int line_num = GetScriptLineNumber(script, shared->start_position()) + 1;
       USE(line_num);
-      PROFILE(CodeCreateEvent(Logger::ToNativeByScript(tag, *script),
+      PROFILE(info->isolate(),
+              CodeCreateEvent(Logger::ToNativeByScript(tag, *script),
                               *code,
                               *shared,
                               String::cast(script->name()),
                               line_num));
     } else {
-      PROFILE(CodeCreateEvent(Logger::ToNativeByScript(tag, *script),
+      PROFILE(info->isolate(),
+              CodeCreateEvent(Logger::ToNativeByScript(tag, *script),
                               *code,
                               *shared,
                               shared->DebugName()));
     }
   }
 
   GDBJIT(AddCode(name,
                  Handle<Script>(info->script()),
                  Handle<Code>(info->code())));
 }
 
 } }  // namespace v8::internal