[Counters] Add histogram timers for StreamingSource compiles.

Adds histogram timing for main-thread portions of streaming source
compilation. Also adds a histogram timer for capturing the amount of time
spent for off-thread parse / compile of streaming sources.

BUG=v8:5203

Change-Id: Ie9f16052205832a620cfbf266d3d66d3fe9d6c12
Reviewed-on: https://chromium-review.googlesource.com/797038Reviewed-by: Adam Klein <adamk@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49724}

src/compiler.cc

@@ -1631,6 +1631,8 @@ Handle<SharedFunctionInfo> Compiler::GetSharedFunctionInfoForBackgroundCompile(
     CompilationJob* outer_function_job,
     CompilationJobList* inner_function_jobs) {
   Isolate* isolate = script->GetIsolate();
+  ScriptCompileTimerScope compile_timer(
+      isolate, ScriptCompiler::kNoCacheBecauseStreamingSource);
   PostponeInterruptsScope postpone(isolate);
 
   // TODO(titzer): increment the counters in caller.
@@ -1655,6 +1657,8 @@ Handle<SharedFunctionInfo> Compiler::GetSharedFunctionInfoForBackgroundCompile(
 Handle<SharedFunctionInfo> Compiler::GetSharedFunctionInfoForStreamedScript(
     Handle<Script> script, ParseInfo* parse_info, int source_length) {
   Isolate* isolate = script->GetIsolate();
+  ScriptCompileTimerScope compile_timer(
+      isolate, ScriptCompiler::kNoCacheBecauseStreamingSource);
   // TODO(titzer): increment the counters in caller.
   isolate->counters()->total_load_size()->Increment(source_length);
   isolate->counters()->total_compile_size()->Increment(source_length);

src/compiler.h

@@ -128,11 +128,6 @@ class V8_EXPORT_PRIVATE Compiler : public AllStatic {
   static Handle<SharedFunctionInfo> GetSharedFunctionInfoForStreamedScript(
       Handle<Script> script, ParseInfo* info, int source_length);
 
-  // Create a shared function info object (the code may be lazily compiled).
-  static Handle<SharedFunctionInfo> GetSharedFunctionInfo(FunctionLiteral* node,
-                                                          Handle<Script> script,
-                                                          Isolate* isolate);
-
   // Create a shared function info object for a Script that has already been
   // compiled on a background thread.
   static Handle<SharedFunctionInfo> GetSharedFunctionInfoForBackgroundCompile(
@@ -140,6 +135,12 @@ class V8_EXPORT_PRIVATE Compiler : public AllStatic {
       CompilationJob* outer_function_job,
       CompilationJobList* inner_function_jobs);
 
+  // Create a shared function info object for the given function literal
+  // node (the code may be lazily compiled).
+  static Handle<SharedFunctionInfo> GetSharedFunctionInfo(FunctionLiteral* node,
+                                                          Handle<Script> script,
+                                                          Isolate* isolate);
+
   // ===========================================================================
   // The following family of methods provides support for OSR. Code generated
   // for entry via OSR might not be suitable for normal entry, hence will be

src/counters.h

@@ -1152,7 +1152,9 @@ class RuntimeCallTimerScope {
      V8.CompileScriptMicroSeconds.NoCache.ScriptTooSmall, 1000000,             \
      MICROSECOND)                                                              \
   HT(compile_script_no_cache_because_cache_too_cold,                           \
-     V8.CompileScriptMicroSeconds.NoCache.CacheTooCold, 1000000, MICROSECOND)
+     V8.CompileScriptMicroSeconds.NoCache.CacheTooCold, 1000000, MICROSECOND)  \
+  HT(compile_script_on_background,                                             \
+     V8.CompileScriptMicroSeconds.BackgroundThread, 1000000, MICROSECOND)
 
 #define AGGREGATABLE_HISTOGRAM_TIMER_LIST(AHT) \
   AHT(compile_lazy, V8.CompileLazyMicroSeconds)

src/parsing/background-parsing-task.cc

@@ -4,6 +4,7 @@
 
 #include "src/parsing/background-parsing-task.h"
 
+#include "src/counters.h"
 #include "src/objects-inl.h"
 #include "src/parsing/parser.h"
 #include "src/parsing/scanner-character-streams.h"
@@ -20,7 +21,10 @@ void StreamedSource::Release() {
 BackgroundParsingTask::BackgroundParsingTask(
     StreamedSource* source, ScriptCompiler::CompileOptions options,
     int stack_size, Isolate* isolate)
-    : source_(source), stack_size_(stack_size), script_data_(nullptr) {
+    : source_(source),
+      stack_size_(stack_size),
+      script_data_(nullptr),
+      timer_(isolate->counters()->compile_script_on_background()) {
   // We don't set the context to the CompilationInfo yet, because the background
   // thread cannot do anything with it anyway. We set it just before compilation
   // on the foreground thread.
@@ -67,6 +71,7 @@ BackgroundParsingTask::BackgroundParsingTask(
 }
 
 void BackgroundParsingTask::Run() {
+  TimedHistogramScope timer(timer_);
   DisallowHeapAllocation no_allocation;
   DisallowHandleAllocation no_handles;
   DisallowHandleDereference no_deref;

src/parsing/background-parsing-task.h

@@ -19,6 +19,7 @@ namespace internal {
 
 class Parser;
 class ScriptData;
+class TimedHistogram;
 
 // Internal representation of v8::ScriptCompiler::StreamedSource. Contains all
 // data which needs to be transmitted between threads for background parsing,
@@ -64,6 +65,7 @@ class BackgroundParsingTask : public ScriptCompiler::ScriptStreamingTask {
   int stack_size_;
   ScriptData* script_data_;
   AccountingAllocator* allocator_;
+  TimedHistogram* timer_;
 };
 
 }  // namespace internal