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 /*

  * Copyright (c) 2011, 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_implementation/g1/g1MonitoringSupport.hpp"

 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"

 #include "gc_implementation/g1/g1CollectorPolicy.hpp"

 G1MonitoringSupport::G1MonitoringSupport(G1CollectedHeap* g1h,

                                          VirtualSpace* g1_storage_addr) :

   _g1h(g1h),

   _incremental_collection_counters(NULL),

   _full_collection_counters(NULL),

   _non_young_collection_counters(NULL),

   _old_space_counters(NULL),

   _young_collection_counters(NULL),

   _eden_counters(NULL),

   _from_counters(NULL),

   _to_counters(NULL),

   _g1_storage_addr(g1_storage_addr)

 {

   // Counters for GC collections

   //

   //  name "collector.0".  In a generational collector this would be the

   // young generation collection.

   _incremental_collection_counters =

     new CollectorCounters("G1 incremental collections", 0);

   //   name "collector.1".  In a generational collector this would be the

   // old generation collection.

   _full_collection_counters =

     new CollectorCounters("G1 stop-the-world full collections", 1);

   // timer sampling for all counters supporting sampling only update the

   // used value.  See the take_sample() method.  G1 requires both used and

   // capacity updated so sampling is not currently used.  It might

   // be sufficient to update all counters in take_sample() even though

   // take_sample() only returns "used".  When sampling was used, there

   // were some anomolous values emitted which may have been the consequence

   // of not updating all values simultaneously (i.e., see the calculation done

   // in eden_space_used(), is it possbile that the values used to

   // calculate either eden_used or survivor_used are being updated by

   // the collector when the sample is being done?).

   const bool sampled = false;

   // "Generation" and "Space" counters.

   //

   //  name "generation.1" This is logically the old generation in

   // generational GC terms.  The "1, 1" parameters are for

   // the n-th generation (=1) with 1 space.

   // Counters are created from minCapacity, maxCapacity, and capacity

   _non_young_collection_counters =

     new GenerationCounters("whole heap", 1, 1, _g1_storage_addr);

   //  name  "generation.1.space.0"

   // Counters are created from maxCapacity, capacity, initCapacity,

   // and used.

   _old_space_counters = new HSpaceCounters("space", 0,

     _g1h->max_capacity(), _g1h->capacity(), _non_young_collection_counters);

   //   Young collection set

   //  name "generation.0".  This is logically the young generation.

   //  The "0, 3" are paremeters for the n-th genertaion (=0) with 3 spaces.

   // See  _non_young_collection_counters for additional counters

   _young_collection_counters = new GenerationCounters("young", 0, 3, NULL);

   // Replace "max_heap_byte_size() with maximum young gen size for

   // g1Collectedheap

   //  name "generation.0.space.0"

   // See _old_space_counters for additional counters

   _eden_counters = new HSpaceCounters("eden", 0,

     _g1h->max_capacity(), eden_space_committed(),

     _young_collection_counters);

   //  name "generation.0.space.1"

   // See _old_space_counters for additional counters

   // Set the arguments to indicate that this survivor space is not used.

   _from_counters = new HSpaceCounters("s0", 1, (long) 0, (long) 0,

     _young_collection_counters);

   //  name "generation.0.space.2"

   // See _old_space_counters for additional counters

   _to_counters = new HSpaceCounters("s1", 2,

     _g1h->max_capacity(),

     survivor_space_committed(),

     _young_collection_counters);

 }

 size_t G1MonitoringSupport::overall_committed() {

   return g1h()->capacity();

 }

 size_t G1MonitoringSupport::overall_used() {

   return g1h()->used_unlocked();

 }

 size_t G1MonitoringSupport::eden_space_committed() {

   return MAX2(eden_space_used(), (size_t) HeapRegion::GrainBytes);

 }

 size_t G1MonitoringSupport::eden_space_used() {

   size_t young_list_length = g1h()->young_list()->length();

   size_t eden_used = young_list_length * HeapRegion::GrainBytes;

   size_t survivor_used = survivor_space_used();

   eden_used = subtract_up_to_zero(eden_used, survivor_used);

   return eden_used;

 }

 size_t G1MonitoringSupport::survivor_space_committed() {

   return MAX2(survivor_space_used(),

               (size_t) HeapRegion::GrainBytes);

 }

 size_t G1MonitoringSupport::survivor_space_used() {

   size_t survivor_num = g1h()->g1_policy()->recorded_survivor_regions();

   size_t survivor_used = survivor_num * HeapRegion::GrainBytes;

   return survivor_used;

 }

 size_t G1MonitoringSupport::old_space_committed() {

   size_t committed = overall_committed();

   size_t eden_committed = eden_space_committed();

   size_t survivor_committed = survivor_space_committed();

   committed = subtract_up_to_zero(committed, eden_committed);

   committed = subtract_up_to_zero(committed, survivor_committed);

   committed = MAX2(committed, (size_t) HeapRegion::GrainBytes);

   return committed;

 }

 // See the comment near the top of g1MonitoringSupport.hpp for

 // an explanation of these calculations for "used" and "capacity".

 size_t G1MonitoringSupport::old_space_used() {

   size_t used = overall_used();

   size_t eden_used = eden_space_used();

   size_t survivor_used = survivor_space_used();

   used = subtract_up_to_zero(used, eden_used);

   used = subtract_up_to_zero(used, survivor_used);

   return used;

 }

 void G1MonitoringSupport::update_counters() {

   if (UsePerfData) {

     eden_counters()->update_capacity(eden_space_committed());

     eden_counters()->update_used(eden_space_used());

     to_counters()->update_capacity(survivor_space_committed());

     to_counters()->update_used(survivor_space_used());

     old_space_counters()->update_capacity(old_space_committed());

     old_space_counters()->update_used(old_space_used());

     non_young_collection_counters()->update_all();

   }

 }

 void G1MonitoringSupport::update_eden_counters() {

   if (UsePerfData) {

     eden_counters()->update_capacity(eden_space_committed());

     eden_counters()->update_used(eden_space_used());

   }

 }