Add Metrics for heap high water marks

runtime/vm/pages.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/pages.h"
 
 #include "platform/assert.h"
 #include "vm/compiler_stats.h"
 #include "vm/gc_marker.h"
 #include "vm/gc_sweeper.h"
@@ skipping 151 matching lines @@
       tasks_(0),
 #if defined(DEBUG)
       iterating_thread_(NULL),
 #endif
       page_space_controller_(heap,
                              FLAG_old_gen_growth_space_ratio,
                              FLAG_old_gen_growth_rate,
                              FLAG_old_gen_growth_time_ratio),
       gc_time_micros_(0),
       collections_(0) {
+  // We aren't holding the lock but no one can reference us yet.
+  UpdateMaxCapacityLocked();
 }
 
 
 PageSpace::~PageSpace() {
   {
     MonitorLocker ml(tasks_lock());
     while (tasks() > 0) {
       ml.Wait();
     }
   }
@@ skipping 343 matching lines @@
 
 void PageSpace::AbandonBumpAllocation() {
   if (bump_top_ < bump_end_) {
     freelist_[HeapPage::kData].Free(bump_top_, bump_end_ - bump_top_);
     bump_top_ = 0;
     bump_end_ = 0;
   }
 }
 
 
+void PageSpace::UpdateMaxCapacityLocked() {
+  ASSERT(heap_ != NULL);
+  ASSERT(heap_->isolate() != NULL);
+  Isolate* isolate = heap_->isolate();
+  isolate->GetHeapOldCapacityMaxMetric()->SetValue(
+      static_cast<int64_t>(usage_.capacity_in_words) * kWordSize);
+}
+
+
 bool PageSpace::Contains(uword addr) const {
   for (ExclusivePageIterator it(this); !it.Done(); it.Advance()) {
     if (it.page()->Contains(addr)) {
       return true;
     }
   }
   return false;
 }
 
 
@@ skipping 634 matching lines @@
     return 0;
   } else {
     ASSERT(total_time >= gc_time);
     int result = static_cast<int>((static_cast<double>(gc_time) /
                                    static_cast<double>(total_time)) * 100);
     return result;
   }
 }
 
 }  // namespace dart