src/share/vm/gc_implementation/g1/g1MonitoringSupport.cpp - platform/external/jetbrains/jdk8u_hotspot - Git at Google

 /*
  * Copyright (c) 2011, 2013, 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 */) {
   if (UsePerfData) {
     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 */) {
   if (UsePerfData) {
     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);

   //  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);

   if (UsePerfData) {
     // 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);
   }
 }

 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).

   uint young_list_length = g1->young_list()->length();
   uint survivor_list_length = g1->g1_policy()->recorded_survivor_regions();
   assert(young_list_length >= survivor_list_length, "invariant");
   uint 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.
   uint young_list_max_length = g1->g1_policy()->young_list_max_length();
   assert(young_list_max_length >= survivor_list_length, "invariant");
   uint eden_list_max_length = young_list_max_length - survivor_list_length;

   _overall_used = g1->used_unlocked();
   _eden_used = (size_t) eden_list_length * HeapRegion::GrainBytes;
   _survivor_used = (size_t) 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 = (size_t) 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).

   uint young_region_num = g1h()->young_list()->length();
   if (young_region_num > _young_region_num) {
     uint diff = young_region_num - _young_region_num;
     _eden_used += (size_t) 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();
     MetaspaceCounters::update_performance_counters();
     CompressedClassSpaceCounters::update_performance_counters();
   }
 }

 void G1MonitoringSupport::update_eden_size() {
   recalculate_eden_size();
   if (UsePerfData) {
     eden_counters()->update_used(eden_space_used());
   }
 }
	/*
	* Copyright (c) 2011, 2013, 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 */) {
	if (UsePerfData) {
	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 */) {
	if (UsePerfData) {
	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);

	// 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);

	if (UsePerfData) {
	// 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);
	}
	}

	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).

	uint young_list_length = g1->young_list()->length();
	uint survivor_list_length = g1->g1_policy()->recorded_survivor_regions();
	assert(young_list_length >= survivor_list_length, "invariant");
	uint 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.
	uint young_list_max_length = g1->g1_policy()->young_list_max_length();
	assert(young_list_max_length >= survivor_list_length, "invariant");
	uint eden_list_max_length = young_list_max_length - survivor_list_length;

	_overall_used = g1->used_unlocked();
	_eden_used = (size_t) eden_list_length * HeapRegion::GrainBytes;
	_survivor_used = (size_t) 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 = (size_t) 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).

	uint young_region_num = g1h()->young_list()->length();
	if (young_region_num > _young_region_num) {
	uint diff = young_region_num - _young_region_num;
	_eden_used += (size_t) 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();
	MetaspaceCounters::update_performance_counters();
	CompressedClassSpaceCounters::update_performance_counters();
	}
	}

	void G1MonitoringSupport::update_eden_size() {
	recalculate_eden_size();
	if (UsePerfData) {
	eden_counters()->update_used(eden_space_used());
	}
	}