Add aggregated memory histograms.

src/heap/gc-tracer.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/heap/gc-tracer.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 95 matching lines @@
   previous_ = previous_incremental_mark_compactor_event_ = current_;
 }
 
 
 void GCTracer::Start(GarbageCollector collector, const char* gc_reason,
                      const char* collector_reason) {
   start_counter_++;
   if (start_counter_ != 1) return;
 
   previous_ = current_;
-  double start_time = base::OS::TimeCurrentMillis();
+  double start_time = heap_->MonotonicallyIncreasingTimeInMs();
   if (new_space_top_after_gc_ != 0) {
     AddNewSpaceAllocationTime(
         start_time - previous_.end_time,
         reinterpret_cast<intptr_t>((heap_->new_space()->top()) -
                                    new_space_top_after_gc_));
   }
   if (current_.type == Event::INCREMENTAL_MARK_COMPACTOR)
     previous_incremental_mark_compactor_event_ = current_;
 
   if (collector == SCAVENGER) {
@@ skipping 20 matching lines @@
       cumulative_incremental_marking_bytes_;
   current_.cumulative_incremental_marking_duration =
       cumulative_incremental_marking_duration_;
   current_.cumulative_pure_incremental_marking_duration =
       cumulative_pure_incremental_marking_duration_;
   current_.longest_incremental_marking_step = longest_incremental_marking_step_;
 
   for (int i = 0; i < Scope::NUMBER_OF_SCOPES; i++) {
     current_.scopes[i] = 0;
   }
+  int committed_memory = static_cast<int>(heap_->CommittedMemory() / KB);
+  int used_memory = static_cast<int>(current_.start_object_size / KB);
+  heap_->isolate()->counters()->aggregated_memory_heap_committed()->AddSample(
+      start_time, committed_memory);
+  heap_->isolate()->counters()->aggregated_memory_heap_used()->AddSample(
+      start_time, used_memory);
 }
 
 
 void GCTracer::Stop(GarbageCollector collector) {
   start_counter_--;
   if (start_counter_ != 0) {
     if (FLAG_trace_gc) {
       PrintF("[Finished reentrant %s during %s.]\n",
              collector == SCAVENGER ? "Scavenge" : "Mark-sweep",
              current_.TypeName(false));
     }
     return;
   }
 
   DCHECK(start_counter_ >= 0);
   DCHECK((collector == SCAVENGER && current_.type == Event::SCAVENGER) ||
          (collector == MARK_COMPACTOR &&
           (current_.type == Event::MARK_COMPACTOR ||
            current_.type == Event::INCREMENTAL_MARK_COMPACTOR)));
 
-  current_.end_time = base::OS::TimeCurrentMillis();
+  current_.end_time = heap_->MonotonicallyIncreasingTimeInMs();
   current_.end_object_size = heap_->SizeOfObjects();
   current_.end_memory_size = heap_->isolate()->memory_allocator()->Size();
   current_.end_holes_size = CountTotalHolesSize(heap_);
   new_space_top_after_gc_ =
       reinterpret_cast<intptr_t>(heap_->new_space()->top());
 
+  int committed_memory = static_cast<int>(heap_->CommittedMemory() / KB);
+  int used_memory = static_cast<int>(current_.end_object_size / KB);
+  heap_->isolate()->counters()->aggregated_memory_heap_committed()->AddSample(
+      current_.end_time, committed_memory);
+  heap_->isolate()->counters()->aggregated_memory_heap_used()->AddSample(
+      current_.end_time, used_memory);
+
   if (current_.type == Event::SCAVENGER) {
     current_.incremental_marking_steps =
         current_.cumulative_incremental_marking_steps -
         previous_.cumulative_incremental_marking_steps;
     current_.incremental_marking_bytes =
         current_.cumulative_incremental_marking_bytes -
         previous_.cumulative_incremental_marking_bytes;
     current_.incremental_marking_duration =
         current_.cumulative_incremental_marking_duration -
         previous_.cumulative_incremental_marking_duration;
@@ skipping 395 matching lines @@
 
 
 bool GCTracer::SurvivalEventsRecorded() const {
   return survival_events_.size() > 0;
 }
 
 
 void GCTracer::ResetSurvivalEvents() { survival_events_.reset(); }
 }
 }  // namespace v8::internal