8151808: Factor G1 heap sizing code out of the G1CollectorPolicy
authormgerdin
Fri, 11 Mar 2016 11:22:56 +0100
changeset 37144 b7ae74d4d5d8
parent 37143 345ad6728be3
child 37148 042294ceef52
8151808: Factor G1 heap sizing code out of the G1CollectorPolicy Reviewed-by: tbenson, jwilhelm
hotspot/src/share/vm/gc/g1/g1Analytics.hpp
hotspot/src/share/vm/gc/g1/g1CollectedHeap.cpp
hotspot/src/share/vm/gc/g1/g1CollectedHeap.hpp
hotspot/src/share/vm/gc/g1/g1CollectorPolicy.cpp
hotspot/src/share/vm/gc/g1/g1CollectorPolicy.hpp
hotspot/src/share/vm/gc/g1/g1HeapSizingPolicy.cpp
hotspot/src/share/vm/gc/g1/g1HeapSizingPolicy.hpp
hotspot/src/share/vm/gc/g1/g1HeapSizingPolicy_ext.cpp
--- a/hotspot/src/share/vm/gc/g1/g1Analytics.hpp	Fri Mar 11 11:22:56 2016 +0100
+++ b/hotspot/src/share/vm/gc/g1/g1Analytics.hpp	Fri Mar 11 11:22:56 2016 +0100
@@ -88,6 +88,10 @@
     return _last_pause_time_ratio;
   }
 
+  uint number_of_recorded_pause_times() const {
+    return NumPrevPausesForHeuristics;
+  }
+
   void append_prev_collection_pause_end_ms(double ms) {
     _prev_collection_pause_end_ms += ms;
   }
--- a/hotspot/src/share/vm/gc/g1/g1CollectedHeap.cpp	Fri Mar 11 11:22:56 2016 +0100
+++ b/hotspot/src/share/vm/gc/g1/g1CollectedHeap.cpp	Fri Mar 11 11:22:56 2016 +0100
@@ -39,6 +39,7 @@
 #include "gc/g1/g1CollectorState.hpp"
 #include "gc/g1/g1EvacStats.inline.hpp"
 #include "gc/g1/g1GCPhaseTimes.hpp"
+#include "gc/g1/g1HeapSizingPolicy.hpp"
 #include "gc/g1/g1HeapTransition.hpp"
 #include "gc/g1/g1HeapVerifier.hpp"
 #include "gc/g1/g1MarkSweep.hpp"
@@ -1783,6 +1784,9 @@
   _verifier = new G1HeapVerifier(this);
 
   _allocator = G1Allocator::create_allocator(this);
+
+  _heap_sizing_policy = G1HeapSizingPolicy::create(this, _g1_policy->analytics());
+
   _humongous_object_threshold_in_words = humongous_threshold_for(HeapRegion::GrainWords);
 
   // Override the default _filler_array_max_size so that no humongous filler
@@ -3408,7 +3412,7 @@
         _allocator->init_mutator_alloc_region();
 
         {
-          size_t expand_bytes = g1_policy()->expansion_amount();
+          size_t expand_bytes = _heap_sizing_policy->expansion_amount();
           if (expand_bytes > 0) {
             size_t bytes_before = capacity();
             // No need for an ergo logging here,
--- a/hotspot/src/share/vm/gc/g1/g1CollectedHeap.hpp	Fri Mar 11 11:22:56 2016 +0100
+++ b/hotspot/src/share/vm/gc/g1/g1CollectedHeap.hpp	Fri Mar 11 11:22:56 2016 +0100
@@ -83,6 +83,7 @@
 class G1Allocator;
 class G1ArchiveAllocator;
 class G1HeapVerifier;
+class G1HeapSizingPolicy;
 
 typedef OverflowTaskQueue<StarTask, mtGC>         RefToScanQueue;
 typedef GenericTaskQueueSet<RefToScanQueue, mtGC> RefToScanQueueSet;
@@ -360,6 +361,7 @@
 
   // The current policy object for the collector.
   G1CollectorPolicy* _g1_policy;
+  G1HeapSizingPolicy* _heap_sizing_policy;
 
   G1CollectionSet _collection_set;
 
--- a/hotspot/src/share/vm/gc/g1/g1CollectorPolicy.cpp	Fri Mar 11 11:22:56 2016 +0100
+++ b/hotspot/src/share/vm/gc/g1/g1CollectorPolicy.cpp	Fri Mar 11 11:22:56 2016 +0100
@@ -49,7 +49,6 @@
   _rs_lengths_prediction(0),
   _max_survivor_regions(0),
   _survivors_age_table(true),
-  _gc_overhead_perc(0.0),
 
   _bytes_allocated_in_old_since_last_gc(0),
   _ihop_control(NULL),
@@ -76,8 +75,6 @@
   HeapRegion::setup_heap_region_size(InitialHeapSize, MaxHeapSize);
   HeapRegionRemSet::setup_remset_size();
 
-  clear_ratio_check_data();
-
   _phase_times = new G1GCPhaseTimes(ParallelGCThreads);
 
   // Below, we might need to calculate the pause time target based on
@@ -123,10 +120,6 @@
 
   _tenuring_threshold = MaxTenuringThreshold;
 
-  assert(GCTimeRatio > 0,
-         "we should have set it to a default value set_g1_gc_flags() "
-         "if a user set it to 0");
-  _gc_overhead_perc = 100.0 * (1.0 / (1.0 + GCTimeRatio));
 
   guarantee(G1ReservePercent <= 50, "Range checking should not allow values over 50.");
   _reserve_factor = (double) G1ReservePercent / 100.0;
@@ -1057,117 +1050,6 @@
   return region_elapsed_time_ms;
 }
 
-void G1CollectorPolicy::clear_ratio_check_data() {
-  _ratio_over_threshold_count = 0;
-  _ratio_over_threshold_sum = 0.0;
-  _pauses_since_start = 0;
-}
-
-size_t G1CollectorPolicy::expansion_amount() {
-  double recent_gc_overhead = _analytics->recent_avg_pause_time_ratio() * 100.0;
-  double last_gc_overhead = _analytics->last_pause_time_ratio() * 100.0;
-  double threshold = _gc_overhead_perc;
-  size_t expand_bytes = 0;
-
-  // If the heap is at less than half its maximum size, scale the threshold down,
-  // to a limit of 1. Thus the smaller the heap is, the more likely it is to expand,
-  // though the scaling code will likely keep the increase small.
-  if (_g1->capacity() <= _g1->max_capacity() / 2) {
-    threshold *= (double)_g1->capacity() / (double)(_g1->max_capacity() / 2);
-    threshold = MAX2(threshold, 1.0);
-  }
-
-  // If the last GC time ratio is over the threshold, increment the count of
-  // times it has been exceeded, and add this ratio to the sum of exceeded
-  // ratios.
-  if (last_gc_overhead > threshold) {
-    _ratio_over_threshold_count++;
-    _ratio_over_threshold_sum += last_gc_overhead;
-  }
-
-  // Check if we've had enough GC time ratio checks that were over the
-  // threshold to trigger an expansion. We'll also expand if we've
-  // reached the end of the history buffer and the average of all entries
-  // is still over the threshold. This indicates a smaller number of GCs were
-  // long enough to make the average exceed the threshold.
-  bool filled_history_buffer = _pauses_since_start == NumPrevPausesForHeuristics;
-  if ((_ratio_over_threshold_count == MinOverThresholdForGrowth) ||
-      (filled_history_buffer && (recent_gc_overhead > threshold))) {
-    size_t min_expand_bytes = HeapRegion::GrainBytes;
-    size_t reserved_bytes = _g1->max_capacity();
-    size_t committed_bytes = _g1->capacity();
-    size_t uncommitted_bytes = reserved_bytes - committed_bytes;
-    size_t expand_bytes_via_pct =
-      uncommitted_bytes * G1ExpandByPercentOfAvailable / 100;
-    double scale_factor = 1.0;
-
-    // If the current size is less than 1/4 of the Initial heap size, expand
-    // by half of the delta between the current and Initial sizes. IE, grow
-    // back quickly.
-    //
-    // Otherwise, take the current size, or G1ExpandByPercentOfAvailable % of
-    // the available expansion space, whichever is smaller, as the base
-    // expansion size. Then possibly scale this size according to how much the
-    // threshold has (on average) been exceeded by. If the delta is small
-    // (less than the StartScaleDownAt value), scale the size down linearly, but
-    // not by less than MinScaleDownFactor. If the delta is large (greater than
-    // the StartScaleUpAt value), scale up, but adding no more than MaxScaleUpFactor
-    // times the base size. The scaling will be linear in the range from
-    // StartScaleUpAt to (StartScaleUpAt + ScaleUpRange). In other words,
-    // ScaleUpRange sets the rate of scaling up.
-    if (committed_bytes < InitialHeapSize / 4) {
-      expand_bytes = (InitialHeapSize - committed_bytes) / 2;
-    } else {
-      double const MinScaleDownFactor = 0.2;
-      double const MaxScaleUpFactor = 2;
-      double const StartScaleDownAt = _gc_overhead_perc;
-      double const StartScaleUpAt = _gc_overhead_perc * 1.5;
-      double const ScaleUpRange = _gc_overhead_perc * 2.0;
-
-      double ratio_delta;
-      if (filled_history_buffer) {
-        ratio_delta = recent_gc_overhead - threshold;
-      } else {
-        ratio_delta = (_ratio_over_threshold_sum/_ratio_over_threshold_count) - threshold;
-      }
-
-      expand_bytes = MIN2(expand_bytes_via_pct, committed_bytes);
-      if (ratio_delta < StartScaleDownAt) {
-        scale_factor = ratio_delta / StartScaleDownAt;
-        scale_factor = MAX2(scale_factor, MinScaleDownFactor);
-      } else if (ratio_delta > StartScaleUpAt) {
-        scale_factor = 1 + ((ratio_delta - StartScaleUpAt) / ScaleUpRange);
-        scale_factor = MIN2(scale_factor, MaxScaleUpFactor);
-      }
-    }
-
-    log_debug(gc, ergo, heap)("Attempt heap expansion (recent GC overhead higher than threshold after GC) "
-                              "recent GC overhead: %1.2f %% threshold: %1.2f %% uncommitted: " SIZE_FORMAT "B base expansion amount and scale: " SIZE_FORMAT "B (%1.2f%%)",
-                              recent_gc_overhead, threshold, uncommitted_bytes, expand_bytes, scale_factor * 100);
-
-    expand_bytes = static_cast<size_t>(expand_bytes * scale_factor);
-
-    // Ensure the expansion size is at least the minimum growth amount
-    // and at most the remaining uncommitted byte size.
-    expand_bytes = MAX2(expand_bytes, min_expand_bytes);
-    expand_bytes = MIN2(expand_bytes, uncommitted_bytes);
-
-    clear_ratio_check_data();
-  } else {
-    // An expansion was not triggered. If we've started counting, increment
-    // the number of checks we've made in the current window.  If we've
-    // reached the end of the window without resizing, clear the counters to
-    // start again the next time we see a ratio above the threshold.
-    if (_ratio_over_threshold_count > 0) {
-      _pauses_since_start++;
-      if (_pauses_since_start > NumPrevPausesForHeuristics) {
-        clear_ratio_check_data();
-      }
-    }
-  }
-
-  return expand_bytes;
-}
 
 void G1CollectorPolicy::print_yg_surv_rate_info() const {
 #ifndef PRODUCT
--- a/hotspot/src/share/vm/gc/g1/g1CollectorPolicy.hpp	Fri Mar 11 11:22:56 2016 +0100
+++ b/hotspot/src/share/vm/gc/g1/g1CollectorPolicy.hpp	Fri Mar 11 11:22:56 2016 +0100
@@ -59,7 +59,6 @@
 
   G1Predictions _predictor;
   G1Analytics* _analytics;
-
   G1MMUTracker* _mmu_tracker;
 
   void initialize_alignments();
@@ -67,11 +66,6 @@
 
   double _full_collection_start_sec;
 
-  // Ratio check data for determining if heap growth is necessary.
-  uint _ratio_over_threshold_count;
-  double _ratio_over_threshold_sum;
-  uint _pauses_since_start;
-
   uint _young_list_target_length;
   uint _young_list_fixed_length;
 
@@ -82,18 +76,9 @@
   SurvRateGroup* _short_lived_surv_rate_group;
   SurvRateGroup* _survivor_surv_rate_group;
 
-  double _gc_overhead_perc;
-
   double _reserve_factor;
   uint   _reserve_regions;
 
-  enum PredictionConstants {
-    NumPrevPausesForHeuristics = 10,
-    // MinOverThresholdForGrowth must be less than NumPrevPausesForHeuristics,
-    // representing the minimum number of pause time ratios that exceed
-    // GCTimeRatio before a heap expansion will be triggered.
-    MinOverThresholdForGrowth = 4
-  };
   G1YoungGenSizer* _young_gen_sizer;
 
   uint _free_regions_at_end_of_collection;
@@ -391,13 +376,6 @@
   // the initial-mark work and start a marking cycle.
   void decide_on_conc_mark_initiation();
 
-  // If an expansion would be appropriate, because recent GC overhead had
-  // exceeded the desired limit, return an amount to expand by.
-  virtual size_t expansion_amount();
-
-  // Clear ratio tracking data used by expansion_amount().
-  void clear_ratio_check_data();
-
   // Print stats on young survival ratio
   void print_yg_surv_rate_info() const;
 
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/gc/g1/g1HeapSizingPolicy.cpp	Fri Mar 11 11:22:56 2016 +0100
@@ -0,0 +1,157 @@
+/*
+ * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "gc/g1/g1CollectedHeap.hpp"
+#include "gc/g1/g1HeapSizingPolicy.hpp"
+#include "gc/g1/g1Analytics.hpp"
+#include "logging/log.hpp"
+#include "runtime/globals.hpp"
+#include "utilities/debug.hpp"
+#include "utilities/globalDefinitions.hpp"
+
+G1HeapSizingPolicy::G1HeapSizingPolicy(const G1CollectedHeap* g1, const G1Analytics* analytics) :
+      _g1(g1),
+      _analytics(analytics),
+      _num_prev_pauses_for_heuristics(analytics->number_of_recorded_pause_times()) {
+    assert(MinOverThresholdForGrowth < _num_prev_pauses_for_heuristics, "Threshold must be less than %u", _num_prev_pauses_for_heuristics);
+    clear_ratio_check_data();
+  }
+
+void G1HeapSizingPolicy::clear_ratio_check_data() {
+  _ratio_over_threshold_count = 0;
+  _ratio_over_threshold_sum = 0.0;
+  _pauses_since_start = 0;
+}
+
+size_t G1HeapSizingPolicy::expansion_amount() {
+  double recent_gc_overhead = _analytics->recent_avg_pause_time_ratio() * 100.0;
+  double last_gc_overhead = _analytics->last_pause_time_ratio() * 100.0;
+  assert(GCTimeRatio > 0,
+         "we should have set it to a default value set_g1_gc_flags() "
+         "if a user set it to 0");
+  const double gc_overhead_perc = 100.0 * (1.0 / (1.0 + GCTimeRatio));
+
+  double threshold = gc_overhead_perc;
+  size_t expand_bytes = 0;
+
+  // If the heap is at less than half its maximum size, scale the threshold down,
+  // to a limit of 1. Thus the smaller the heap is, the more likely it is to expand,
+  // though the scaling code will likely keep the increase small.
+  if (_g1->capacity() <= _g1->max_capacity() / 2) {
+    threshold *= (double)_g1->capacity() / (double)(_g1->max_capacity() / 2);
+    threshold = MAX2(threshold, 1.0);
+  }
+
+  // If the last GC time ratio is over the threshold, increment the count of
+  // times it has been exceeded, and add this ratio to the sum of exceeded
+  // ratios.
+  if (last_gc_overhead > threshold) {
+    _ratio_over_threshold_count++;
+    _ratio_over_threshold_sum += last_gc_overhead;
+  }
+
+  // Check if we've had enough GC time ratio checks that were over the
+  // threshold to trigger an expansion. We'll also expand if we've
+  // reached the end of the history buffer and the average of all entries
+  // is still over the threshold. This indicates a smaller number of GCs were
+  // long enough to make the average exceed the threshold.
+  bool filled_history_buffer = _pauses_since_start == _num_prev_pauses_for_heuristics;
+  if ((_ratio_over_threshold_count == MinOverThresholdForGrowth) ||
+      (filled_history_buffer && (recent_gc_overhead > threshold))) {
+    size_t min_expand_bytes = HeapRegion::GrainBytes;
+    size_t reserved_bytes = _g1->max_capacity();
+    size_t committed_bytes = _g1->capacity();
+    size_t uncommitted_bytes = reserved_bytes - committed_bytes;
+    size_t expand_bytes_via_pct =
+      uncommitted_bytes * G1ExpandByPercentOfAvailable / 100;
+    double scale_factor = 1.0;
+
+    // If the current size is less than 1/4 of the Initial heap size, expand
+    // by half of the delta between the current and Initial sizes. IE, grow
+    // back quickly.
+    //
+    // Otherwise, take the current size, or G1ExpandByPercentOfAvailable % of
+    // the available expansion space, whichever is smaller, as the base
+    // expansion size. Then possibly scale this size according to how much the
+    // threshold has (on average) been exceeded by. If the delta is small
+    // (less than the StartScaleDownAt value), scale the size down linearly, but
+    // not by less than MinScaleDownFactor. If the delta is large (greater than
+    // the StartScaleUpAt value), scale up, but adding no more than MaxScaleUpFactor
+    // times the base size. The scaling will be linear in the range from
+    // StartScaleUpAt to (StartScaleUpAt + ScaleUpRange). In other words,
+    // ScaleUpRange sets the rate of scaling up.
+    if (committed_bytes < InitialHeapSize / 4) {
+      expand_bytes = (InitialHeapSize - committed_bytes) / 2;
+    } else {
+      double const MinScaleDownFactor = 0.2;
+      double const MaxScaleUpFactor = 2;
+      double const StartScaleDownAt = gc_overhead_perc;
+      double const StartScaleUpAt = gc_overhead_perc * 1.5;
+      double const ScaleUpRange = gc_overhead_perc * 2.0;
+
+      double ratio_delta;
+      if (filled_history_buffer) {
+        ratio_delta = recent_gc_overhead - threshold;
+      } else {
+        ratio_delta = (_ratio_over_threshold_sum/_ratio_over_threshold_count) - threshold;
+      }
+
+      expand_bytes = MIN2(expand_bytes_via_pct, committed_bytes);
+      if (ratio_delta < StartScaleDownAt) {
+        scale_factor = ratio_delta / StartScaleDownAt;
+        scale_factor = MAX2(scale_factor, MinScaleDownFactor);
+      } else if (ratio_delta > StartScaleUpAt) {
+        scale_factor = 1 + ((ratio_delta - StartScaleUpAt) / ScaleUpRange);
+        scale_factor = MIN2(scale_factor, MaxScaleUpFactor);
+      }
+    }
+
+    log_debug(gc, ergo, heap)("Attempt heap expansion (recent GC overhead higher than threshold after GC) "
+                              "recent GC overhead: %1.2f %% threshold: %1.2f %% uncommitted: " SIZE_FORMAT "B base expansion amount and scale: " SIZE_FORMAT "B (%1.2f%%)",
+                              recent_gc_overhead, threshold, uncommitted_bytes, expand_bytes, scale_factor * 100);
+
+    expand_bytes = static_cast<size_t>(expand_bytes * scale_factor);
+
+    // Ensure the expansion size is at least the minimum growth amount
+    // and at most the remaining uncommitted byte size.
+    expand_bytes = MAX2(expand_bytes, min_expand_bytes);
+    expand_bytes = MIN2(expand_bytes, uncommitted_bytes);
+
+    clear_ratio_check_data();
+  } else {
+    // An expansion was not triggered. If we've started counting, increment
+    // the number of checks we've made in the current window.  If we've
+    // reached the end of the window without resizing, clear the counters to
+    // start again the next time we see a ratio above the threshold.
+    if (_ratio_over_threshold_count > 0) {
+      _pauses_since_start++;
+      if (_pauses_since_start > _num_prev_pauses_for_heuristics) {
+        clear_ratio_check_data();
+      }
+    }
+  }
+
+  return expand_bytes;
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/gc/g1/g1HeapSizingPolicy.hpp	Fri Mar 11 11:22:56 2016 +0100
@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef SHARE_VM_GC_G1_G1HEAPSIZINGPOLICY_HPP
+#define SHARE_VM_GC_G1_G1HEAPSIZINGPOLICY_HPP
+
+#include "memory/allocation.hpp"
+
+class G1Analytics;
+class G1CollectedHeap;
+
+class G1HeapSizingPolicy: public CHeapObj<mtGC> {
+  // MinOverThresholdForGrowth must be less than the number of recorded
+  // pause times in G1Analytics, representing the minimum number of pause
+  // time ratios that exceed GCTimeRatio before a heap expansion will be triggered.
+  const static uint MinOverThresholdForGrowth = 4;
+
+  const G1CollectedHeap* _g1;
+  const G1Analytics* _analytics;
+
+  const uint _num_prev_pauses_for_heuristics;
+  // Ratio check data for determining if heap growth is necessary.
+  uint _ratio_over_threshold_count;
+  double _ratio_over_threshold_sum;
+  uint _pauses_since_start;
+
+
+protected:
+  G1HeapSizingPolicy(const G1CollectedHeap* g1, const G1Analytics* analytics);
+public:
+
+  // If an expansion would be appropriate, because recent GC overhead had
+  // exceeded the desired limit, return an amount to expand by.
+  virtual size_t expansion_amount();
+
+  // Clear ratio tracking data used by expansion_amount().
+  void clear_ratio_check_data();
+
+  static G1HeapSizingPolicy* create(const G1CollectedHeap* g1, const G1Analytics* analytics);
+};
+
+#endif // SRC_SHARE_VM_GC_G1_G1HEAPSIZINGPOLICY_HPP
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/gc/g1/g1HeapSizingPolicy_ext.cpp	Fri Mar 11 11:22:56 2016 +0100
@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "gc/g1/g1HeapSizingPolicy.hpp"
+
+G1HeapSizingPolicy* G1HeapSizingPolicy::create(const G1CollectedHeap* g1, const G1Analytics* analytics) {
+  return new G1HeapSizingPolicy(g1, analytics);
+}