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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"

 G1GenerationCounters::G1GenerationCounters(G1MonitoringSupport* g1mm,

                                            const char* name,

                                            int ordinal, int spaces,

                                            size_t min_capacity,

                                            size_t max_capacity,

                                            size_t curr_capacity)

   : GenerationCounters(name, ordinal, spaces, min_capacity,

                        max_capacity, curr_capacity), _g1mm(g1mm) { }

 // We pad the capacity three times given that the young generation

 // contains three spaces (eden and two survivors).

 G1YoungGenerationCounters::G1YoungGenerationCounters(G1MonitoringSupport* g1mm,

                                                      const char* name)

   : G1GenerationCounters(g1mm, name, 0 /* ordinal */, 3 /* spaces */,

                G1MonitoringSupport::pad_capacity(0, 3) /* min_capacity */,

                G1MonitoringSupport::pad_capacity(g1mm->young_gen_max(), 3),

                G1MonitoringSupport::pad_capacity(0, 3) /* curr_capacity */) {

   update_all();

 }

 G1OldGenerationCounters::G1OldGenerationCounters(G1MonitoringSupport* g1mm,

                                                  const char* name)

   : G1GenerationCounters(g1mm, name, 1 /* ordinal */, 1 /* spaces */,

                G1MonitoringSupport::pad_capacity(0) /* min_capacity */,

                G1MonitoringSupport::pad_capacity(g1mm->old_gen_max()),

                G1MonitoringSupport::pad_capacity(0) /* curr_capacity */) {

   update_all();

 }

 void G1YoungGenerationCounters::update_all() {

   size_t committed =

             G1MonitoringSupport::pad_capacity(_g1mm->young_gen_committed(), 3);

   _current_size->set_value(committed);

 }

 void G1OldGenerationCounters::update_all() {

   size_t committed =

             G1MonitoringSupport::pad_capacity(_g1mm->old_gen_committed());

   _current_size->set_value(committed);

 }

 G1MonitoringSupport::G1MonitoringSupport(G1CollectedHeap* g1h) :

   _g1h(g1h),

   _incremental_collection_counters(NULL),

   _full_collection_counters(NULL),

   _old_collection_counters(NULL),

   _old_space_counters(NULL),

   _young_collection_counters(NULL),

   _eden_counters(NULL),

   _from_counters(NULL),

   _to_counters(NULL),

   _overall_reserved(0),

   _overall_committed(0),    _overall_used(0),

   _young_region_num(0),

   _young_gen_committed(0),

   _eden_committed(0),       _eden_used(0),

   _survivor_committed(0),   _survivor_used(0),

   _old_committed(0),        _old_used(0) {

   _overall_reserved = g1h->max_capacity();

   recalculate_sizes();

   // 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

   _old_collection_counters = new G1OldGenerationCounters(this, "old");

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

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

   // and used.

   _old_space_counters = new HSpaceCounters("space", 0 /* ordinal */,

     pad_capacity(overall_reserved()) /* max_capacity */,

     pad_capacity(old_space_committed()) /* init_capacity */,

    _old_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  _old_collection_counters for additional counters

   _young_collection_counters = new G1YoungGenerationCounters(this, "young");

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

   // See _old_space_counters for additional counters

   _eden_counters = new HSpaceCounters("eden", 0 /* ordinal */,

     pad_capacity(overall_reserved()) /* max_capacity */,

     pad_capacity(eden_space_committed()) /* init_capacity */,

     _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 /* ordinal */,

     pad_capacity(0) /* max_capacity */,

     pad_capacity(0) /* init_capacity */,

     _young_collection_counters);

   // Given that this survivor space is not used, we update it here

   // once to reflect that its used space is 0 so that we don't have to

   // worry about updating it again later.

   _from_counters->update_used(0);

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

   // See _old_space_counters for additional counters

   _to_counters = new HSpaceCounters("s1", 2 /* ordinal */,

     pad_capacity(overall_reserved()) /* max_capacity */,

     pad_capacity(survivor_space_committed()) /* init_capacity */,

     _young_collection_counters);

 }

 void G1MonitoringSupport::recalculate_sizes() {

   G1CollectedHeap* g1 = g1h();

   // Recalculate all the sizes from scratch. We assume that this is

   // called at a point where no concurrent updates to the various

   // values we read here are possible (i.e., at a STW phase at the end

   // of a GC).

   size_t young_list_length = g1->young_list()->length();

   size_t survivor_list_length = g1->g1_policy()->recorded_survivor_regions();

   assert(young_list_length >= survivor_list_length, "invariant");

   size_t eden_list_length = young_list_length - survivor_list_length;

   // Max length includes any potential extensions to the young gen

   // we'll do when the GC locker is active.

   size_t young_list_max_length = g1->g1_policy()->young_list_max_length();

   assert(young_list_max_length >= survivor_list_length, "invariant");

   size_t eden_list_max_length = young_list_max_length - survivor_list_length;

   _overall_used = g1->used_unlocked();

   _eden_used = eden_list_length * HeapRegion::GrainBytes;

   _survivor_used = survivor_list_length * HeapRegion::GrainBytes;

   _young_region_num = young_list_length;

   _old_used = subtract_up_to_zero(_overall_used, _eden_used + _survivor_used);

   // First calculate the committed sizes that can be calculated independently.

   _survivor_committed = _survivor_used;

   _old_committed = HeapRegion::align_up_to_region_byte_size(_old_used);

   // Next, start with the overall committed size.

   _overall_committed = g1->capacity();

   size_t committed = _overall_committed;

   // Remove the committed size we have calculated so far (for the

   // survivor and old space).

   assert(committed >= (_survivor_committed + _old_committed), "sanity");

   committed -= _survivor_committed + _old_committed;

   // Next, calculate and remove the committed size for the eden.

   _eden_committed = eden_list_max_length * HeapRegion::GrainBytes;

   // Somewhat defensive: be robust in case there are inaccuracies in

   // the calculations

   _eden_committed = MIN2(_eden_committed, committed);

   committed -= _eden_committed;

   // Finally, give the rest to the old space...

   _old_committed += committed;

   // ..and calculate the young gen committed.

   _young_gen_committed = _eden_committed + _survivor_committed;

   assert(_overall_committed ==

          (_eden_committed + _survivor_committed + _old_committed),

          "the committed sizes should add up");

   // Somewhat defensive: cap the eden used size to make sure it

   // never exceeds the committed size.

   _eden_used = MIN2(_eden_used, _eden_committed);

   // _survivor_committed and _old_committed are calculated in terms of

   // the corresponding _*_used value, so the next two conditions

   // should hold.

   assert(_survivor_used <= _survivor_committed, "post-condition");

   assert(_old_used <= _old_committed, "post-condition");

 }

 void G1MonitoringSupport::recalculate_eden_size() {

   G1CollectedHeap* g1 = g1h();

   // When a new eden region is allocated, only the eden_used size is

   // affected (since we have recalculated everything else at the last GC).

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

   if (young_region_num > _young_region_num) {

     size_t diff = young_region_num - _young_region_num;

     _eden_used += diff * HeapRegion::GrainBytes;

     // Somewhat defensive: cap the eden used size to make sure it

     // never exceeds the committed size.

     _eden_used = MIN2(_eden_used, _eden_committed);

     _young_region_num = young_region_num;

   }

 }

 void G1MonitoringSupport::update_sizes() {

   recalculate_sizes();

   if (UsePerfData) {

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

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

     // only the to survivor space (s1) is active, so we don't need to

     // update the counteres for the from survivor space (s0)

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

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

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

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

     old_collection_counters()->update_all();

     young_collection_counters()->update_all();

   }

 }

 void G1MonitoringSupport::update_eden_size() {

   recalculate_eden_size();

   if (UsePerfData) {

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

   }

 }