author | jwilhelm |
Thu, 03 Oct 2013 21:36:29 +0200 | |
changeset 20398 | b206c580c45f |
parent 19322 | e35f9ed4f081 |
child 22234 | da823d78ad65 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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||
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#include "precompiled.hpp" |
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#include "gc_implementation/g1/g1MonitoringSupport.hpp" |
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#include "gc_implementation/g1/g1CollectedHeap.inline.hpp" |
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#include "gc_implementation/g1/g1CollectorPolicy.hpp" |
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||
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G1GenerationCounters::G1GenerationCounters(G1MonitoringSupport* g1mm, |
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const char* name, |
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int ordinal, int spaces, |
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size_t min_capacity, |
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size_t max_capacity, |
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size_t curr_capacity) |
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: GenerationCounters(name, ordinal, spaces, min_capacity, |
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max_capacity, curr_capacity), _g1mm(g1mm) { } |
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|
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// We pad the capacity three times given that the young generation |
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// contains three spaces (eden and two survivors). |
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G1YoungGenerationCounters::G1YoungGenerationCounters(G1MonitoringSupport* g1mm, |
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const char* name) |
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: G1GenerationCounters(g1mm, name, 0 /* ordinal */, 3 /* spaces */, |
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G1MonitoringSupport::pad_capacity(0, 3) /* min_capacity */, |
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G1MonitoringSupport::pad_capacity(g1mm->young_gen_max(), 3), |
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G1MonitoringSupport::pad_capacity(0, 3) /* curr_capacity */) { |
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if (UsePerfData) { |
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update_all(); |
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} |
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} |
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G1OldGenerationCounters::G1OldGenerationCounters(G1MonitoringSupport* g1mm, |
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const char* name) |
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: G1GenerationCounters(g1mm, name, 1 /* ordinal */, 1 /* spaces */, |
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G1MonitoringSupport::pad_capacity(0) /* min_capacity */, |
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G1MonitoringSupport::pad_capacity(g1mm->old_gen_max()), |
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G1MonitoringSupport::pad_capacity(0) /* curr_capacity */) { |
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if (UsePerfData) { |
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update_all(); |
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} |
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} |
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void G1YoungGenerationCounters::update_all() { |
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size_t committed = |
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G1MonitoringSupport::pad_capacity(_g1mm->young_gen_committed(), 3); |
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_current_size->set_value(committed); |
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} |
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void G1OldGenerationCounters::update_all() { |
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size_t committed = |
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G1MonitoringSupport::pad_capacity(_g1mm->old_gen_committed()); |
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_current_size->set_value(committed); |
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} |
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G1MonitoringSupport::G1MonitoringSupport(G1CollectedHeap* g1h) : |
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_g1h(g1h), |
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_incremental_collection_counters(NULL), |
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_full_collection_counters(NULL), |
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_old_collection_counters(NULL), |
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_old_space_counters(NULL), |
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_young_collection_counters(NULL), |
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_eden_counters(NULL), |
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_from_counters(NULL), |
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_to_counters(NULL), |
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_overall_reserved(0), |
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_overall_committed(0), _overall_used(0), |
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_young_region_num(0), |
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_young_gen_committed(0), |
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_eden_committed(0), _eden_used(0), |
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_survivor_committed(0), _survivor_used(0), |
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_old_committed(0), _old_used(0) { |
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_overall_reserved = g1h->max_capacity(); |
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recalculate_sizes(); |
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// Counters for GC collections |
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// |
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// name "collector.0". In a generational collector this would be the |
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// young generation collection. |
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_incremental_collection_counters = |
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new CollectorCounters("G1 incremental collections", 0); |
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// name "collector.1". In a generational collector this would be the |
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// old generation collection. |
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_full_collection_counters = |
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new CollectorCounters("G1 stop-the-world full collections", 1); |
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// timer sampling for all counters supporting sampling only update the |
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// used value. See the take_sample() method. G1 requires both used and |
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// capacity updated so sampling is not currently used. It might |
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// be sufficient to update all counters in take_sample() even though |
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// take_sample() only returns "used". When sampling was used, there |
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// were some anomolous values emitted which may have been the consequence |
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// of not updating all values simultaneously (i.e., see the calculation done |
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// in eden_space_used(), is it possbile that the values used to |
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// calculate either eden_used or survivor_used are being updated by |
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// the collector when the sample is being done?). |
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const bool sampled = false; |
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// "Generation" and "Space" counters. |
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// |
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// name "generation.1" This is logically the old generation in |
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// generational GC terms. The "1, 1" parameters are for |
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// the n-th generation (=1) with 1 space. |
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// Counters are created from minCapacity, maxCapacity, and capacity |
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_old_collection_counters = new G1OldGenerationCounters(this, "old"); |
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// name "generation.1.space.0" |
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// Counters are created from maxCapacity, capacity, initCapacity, |
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// and used. |
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_old_space_counters = new HSpaceCounters("space", 0 /* ordinal */, |
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pad_capacity(overall_reserved()) /* max_capacity */, |
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pad_capacity(old_space_committed()) /* init_capacity */, |
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_old_collection_counters); |
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// Young collection set |
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// name "generation.0". This is logically the young generation. |
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// The "0, 3" are paremeters for the n-th genertaion (=0) with 3 spaces. |
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// See _old_collection_counters for additional counters |
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_young_collection_counters = new G1YoungGenerationCounters(this, "young"); |
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// name "generation.0.space.0" |
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// See _old_space_counters for additional counters |
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_eden_counters = new HSpaceCounters("eden", 0 /* ordinal */, |
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pad_capacity(overall_reserved()) /* max_capacity */, |
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pad_capacity(eden_space_committed()) /* init_capacity */, |
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_young_collection_counters); |
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// name "generation.0.space.1" |
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// See _old_space_counters for additional counters |
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// Set the arguments to indicate that this survivor space is not used. |
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_from_counters = new HSpaceCounters("s0", 1 /* ordinal */, |
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pad_capacity(0) /* max_capacity */, |
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pad_capacity(0) /* init_capacity */, |
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_young_collection_counters); |
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// name "generation.0.space.2" |
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// See _old_space_counters for additional counters |
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_to_counters = new HSpaceCounters("s1", 2 /* ordinal */, |
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pad_capacity(overall_reserved()) /* max_capacity */, |
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pad_capacity(survivor_space_committed()) /* init_capacity */, |
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_young_collection_counters); |
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if (UsePerfData) { |
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// Given that this survivor space is not used, we update it here |
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// once to reflect that its used space is 0 so that we don't have to |
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// worry about updating it again later. |
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_from_counters->update_used(0); |
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} |
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} |
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void G1MonitoringSupport::recalculate_sizes() { |
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G1CollectedHeap* g1 = g1h(); |
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// Recalculate all the sizes from scratch. We assume that this is |
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// called at a point where no concurrent updates to the various |
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// values we read here are possible (i.e., at a STW phase at the end |
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// of a GC). |
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uint young_list_length = g1->young_list()->length(); |
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uint survivor_list_length = g1->g1_policy()->recorded_survivor_regions(); |
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assert(young_list_length >= survivor_list_length, "invariant"); |
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uint eden_list_length = young_list_length - survivor_list_length; |
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// Max length includes any potential extensions to the young gen |
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// we'll do when the GC locker is active. |
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uint young_list_max_length = g1->g1_policy()->young_list_max_length(); |
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assert(young_list_max_length >= survivor_list_length, "invariant"); |
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uint eden_list_max_length = young_list_max_length - survivor_list_length; |
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_overall_used = g1->used_unlocked(); |
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_eden_used = (size_t) eden_list_length * HeapRegion::GrainBytes; |
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_survivor_used = (size_t) survivor_list_length * HeapRegion::GrainBytes; |
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_young_region_num = young_list_length; |
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_old_used = subtract_up_to_zero(_overall_used, _eden_used + _survivor_used); |
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|
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// First calculate the committed sizes that can be calculated independently. |
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_survivor_committed = _survivor_used; |
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_old_committed = HeapRegion::align_up_to_region_byte_size(_old_used); |
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// Next, start with the overall committed size. |
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_overall_committed = g1->capacity(); |
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size_t committed = _overall_committed; |
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// Remove the committed size we have calculated so far (for the |
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// survivor and old space). |
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assert(committed >= (_survivor_committed + _old_committed), "sanity"); |
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committed -= _survivor_committed + _old_committed; |
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// Next, calculate and remove the committed size for the eden. |
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_eden_committed = (size_t) eden_list_max_length * HeapRegion::GrainBytes; |
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// Somewhat defensive: be robust in case there are inaccuracies in |
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// the calculations |
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_eden_committed = MIN2(_eden_committed, committed); |
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committed -= _eden_committed; |
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// Finally, give the rest to the old space... |
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_old_committed += committed; |
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// ..and calculate the young gen committed. |
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_young_gen_committed = _eden_committed + _survivor_committed; |
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assert(_overall_committed == |
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(_eden_committed + _survivor_committed + _old_committed), |
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"the committed sizes should add up"); |
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// Somewhat defensive: cap the eden used size to make sure it |
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// never exceeds the committed size. |
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_eden_used = MIN2(_eden_used, _eden_committed); |
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// _survivor_committed and _old_committed are calculated in terms of |
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// the corresponding _*_used value, so the next two conditions |
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// should hold. |
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assert(_survivor_used <= _survivor_committed, "post-condition"); |
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assert(_old_used <= _old_committed, "post-condition"); |
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} |
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void G1MonitoringSupport::recalculate_eden_size() { |
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G1CollectedHeap* g1 = g1h(); |
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// When a new eden region is allocated, only the eden_used size is |
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// affected (since we have recalculated everything else at the last GC). |
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uint young_region_num = g1h()->young_list()->length(); |
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if (young_region_num > _young_region_num) { |
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uint diff = young_region_num - _young_region_num; |
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_eden_used += (size_t) diff * HeapRegion::GrainBytes; |
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// Somewhat defensive: cap the eden used size to make sure it |
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// never exceeds the committed size. |
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_eden_used = MIN2(_eden_used, _eden_committed); |
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_young_region_num = young_region_num; |
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} |
249 |
} |
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void G1MonitoringSupport::update_sizes() { |
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recalculate_sizes(); |
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if (UsePerfData) { |
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eden_counters()->update_capacity(pad_capacity(eden_space_committed())); |
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eden_counters()->update_used(eden_space_used()); |
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// only the to survivor space (s1) is active, so we don't need to |
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// update the counteres for the from survivor space (s0) |
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to_counters()->update_capacity(pad_capacity(survivor_space_committed())); |
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to_counters()->update_used(survivor_space_used()); |
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old_space_counters()->update_capacity(pad_capacity(old_space_committed())); |
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old_space_counters()->update_used(old_space_used()); |
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old_collection_counters()->update_all(); |
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young_collection_counters()->update_all(); |
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MetaspaceCounters::update_performance_counters(); |
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CompressedClassSpaceCounters::update_performance_counters(); |
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} |
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} |
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void G1MonitoringSupport::update_eden_size() { |
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recalculate_eden_size(); |
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if (UsePerfData) { |
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eden_counters()->update_used(eden_space_used()); |
273 |
} |
|
274 |
} |