Make sure that idle scavenges are just performed when enough objects are allocated in new space.

src/heap/gc-idle-time-handler.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/heap/gc-idle-time-handler.h"
 #include "src/heap/gc-tracer.h"
 #include "src/utils.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 113 matching lines @@
 
   // We do not know the allocation throughput before the first Scavenge.
   // TODO(hpayer): Estimate allocation throughput before the first Scavenge.
   if (new_space_allocation_throughput_in_bytes_per_ms == 0) {
     new_space_allocation_limit =
         static_cast<size_t>(new_space_size * kConservativeTimeRatio);
   } else {
     // We have to trigger scavenge before we reach the end of new space.
     size_t adjust_limit = new_space_allocation_throughput_in_bytes_per_ms *
                           kTimeUntilNextIdleEvent;
-    if (adjust_limit > new_space_allocation_limit)
+    if (adjust_limit > new_space_allocation_limit) {
       new_space_allocation_limit = 0;
-    else
+    } else {
       new_space_allocation_limit -= adjust_limit;
+    }
+  }
+
+  // The allocated new space limit to trigger a Scavange has to be at least

[Erik Corry, 2015/05/15 13:03:16]

Scavange -> scavenge  <-- note vowel change

[Hannes Payer (out of office), 2015/05/15 15:12:49]

Done. Fixed them all.

+  // kMinimumNewSpaceSizeToPerformScavenge.
+  if (new_space_allocation_limit < kMinimumNewSpaceSizeToPerformScavenge) {
+    new_space_allocation_limit = kMinimumNewSpaceSizeToPerformScavenge;
   }
 
   if (scavenge_speed_in_bytes_per_ms == 0) {
     scavenge_speed_in_bytes_per_ms = kInitialConservativeScavengeSpeed;
   }
 
   if (new_space_allocation_limit <= used_new_space_size) {
     if (used_new_space_size / scavenge_speed_in_bytes_per_ms <=
         idle_time_in_ms) {
       return true;
@@ skipping 228 matching lines @@
       }
       if (mutator_gcs > idle_mark_compacts_) {
         return kReduceLatency;
       }
       break;
   }
   return mode_;
 }
 }
 }