Add more safe points in compiler

runtime/vm/scavenger.cc

 // Copyright (c) 2011, 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/scavenger.h"
 
 #include "vm/dart.h"
 #include "vm/dart_api_state.h"
 #include "vm/isolate.h"
 #include "vm/lockers.h"
@@ skipping 763 matching lines @@
 }
 
 
 void Scavenger::Scavenge(bool invoke_api_callbacks) {
   Isolate* isolate = heap_->isolate();
   // Ensure that all threads for this isolate are at a safepoint (either stopped
   // or in native code). If two threads are racing at this point, the loser
   // will continue with its scavenge after waiting for the winner to complete.
   // TODO(koda): Consider moving SafepointThreads into allocation failure/retry
   // logic to avoid needless collections.
+
+  int64_t pre_safe_point = OS::GetCurrentMonotonicMicros();
+
   Thread* thread = Thread::Current();
   SafepointOperationScope safepoint_scope(thread);
 
   // Scavenging is not reentrant. Make sure that is the case.
   ASSERT(!scavenging_);
   scavenging_ = true;
 
   PageSpace* page_space = heap_->old_space();
   NoSafepointScope no_safepoints;
 
+  int64_t post_safe_point = OS::GetCurrentMonotonicMicros();
+  heap_->RecordTime(kSafePoint, post_safe_point - pre_safe_point);
+
   // TODO(koda): Make verification more compatible with concurrent sweep.
   if (FLAG_verify_before_gc && !FLAG_concurrent_sweep) {
     OS::PrintErr("Verifying before Scavenge...");
     heap_->Verify(kForbidMarked);
     OS::PrintErr(" done.\n");
   }
 
   // Prepare for a scavenge.
   SpaceUsage usage_before = GetCurrentUsage();
   intptr_t promo_candidate_words =
@@ skipping 95 matching lines @@
 }
 
 
 void Scavenger::FreeExternal(intptr_t size) {
   ASSERT(size >= 0);
   external_size_ -= size;
   ASSERT(external_size_ >= 0);
 }
 
 }  // namespace dart