author | jwilhelm |
Thu, 03 Oct 2013 21:36:29 +0200 | |
changeset 20398 | b206c580c45f |
parent 18025 | b7bcf7497f93 |
child 22551 | 9bf46d16dcc6 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2011, 2013, 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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#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1MONITORINGSUPPORT_HPP |
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#define SHARE_VM_GC_IMPLEMENTATION_G1_G1MONITORINGSUPPORT_HPP |
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#include "gc_implementation/shared/hSpaceCounters.hpp" |
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class G1CollectedHeap; |
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// Class for monitoring logical spaces in G1. It provides data for |
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// both G1's jstat counters as well as G1's memory pools. |
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// |
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// G1 splits the heap into heap regions and each heap region belongs |
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// to one of the following categories: |
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// |
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// * eden : regions that have been allocated since the last GC |
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// * survivors : regions with objects that survived the last few GCs |
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// * old : long-lived non-humongous regions |
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// * humongous : humongous regions |
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// * free : free regions |
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// |
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// The combination of eden and survivor regions form the equivalent of |
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// the young generation in the other GCs. The combination of old and |
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// humongous regions form the equivalent of the old generation in the |
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// other GCs. Free regions do not have a good equivalent in the other |
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// GCs given that they can be allocated as any of the other region types. |
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// |
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// The monitoring tools expect the heap to contain a number of |
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// generations (young, old, perm) and each generation to contain a |
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// number of spaces (young: eden, survivors, old). Given that G1 does |
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// not maintain those spaces physically (e.g., the set of |
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// non-contiguous eden regions can be considered as a "logical" |
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// space), we'll provide the illusion that those generations and |
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// spaces exist. In reality, each generation and space refers to a set |
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// of heap regions that are potentially non-contiguous. |
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// |
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// This class provides interfaces to access the min, current, and max |
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// capacity and current occupancy for each of G1's logical spaces and |
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// generations we expose to the monitoring tools. Also provided are |
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// counters for G1 concurrent collections and stop-the-world full heap |
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// collections. |
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// |
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// Below is a description of how the various sizes are calculated. |
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// |
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// * Current Capacity |
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// |
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// - heap_capacity = current heap capacity (e.g., current committed size) |
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// - young_gen_capacity = current max young gen target capacity |
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// (i.e., young gen target capacity + max allowed expansion capacity) |
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// - survivor_capacity = current survivor region capacity |
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// - eden_capacity = young_gen_capacity - survivor_capacity |
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// - old_capacity = heap_capacity - young_gen_capacity |
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// |
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// What we do in the above is to distribute the free regions among |
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// eden_capacity and old_capacity. |
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// |
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// * Occupancy |
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// |
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// - young_gen_used = current young region capacity |
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// - survivor_used = survivor_capacity |
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// - eden_used = young_gen_used - survivor_used |
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// - old_used = overall_used - young_gen_used |
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// |
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// Unfortunately, we currently only keep track of the number of |
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// currently allocated young and survivor regions + the overall used |
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// bytes in the heap, so the above can be a little inaccurate. |
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// |
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// * Min Capacity |
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// |
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// We set this to 0 for all spaces. |
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// |
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// * Max Capacity |
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// |
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// For jstat, we set the max capacity of all spaces to heap_capacity, |
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// given that we don't always have a reasonable upper bound on how big |
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// each space can grow. For the memory pools, we make the max |
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// capacity undefined with the exception of the old memory pool for |
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// which we make the max capacity same as the max heap capacity. |
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// |
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// If we had more accurate occupancy / capacity information per |
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// region set the above calculations would be greatly simplified and |
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// be made more accurate. |
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// |
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// We update all the above synchronously and we store the results in |
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// fields so that we just read said fields when needed. A subtle point |
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// is that all the above sizes need to be recalculated when the old |
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// gen changes capacity (after a GC or after a humongous allocation) |
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// but only the eden occupancy changes when a new eden region is |
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// allocated. So, in the latter case we have minimal recalcuation to |
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// do which is important as we want to keep the eden region allocation |
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// path as low-overhead as possible. |
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class G1MonitoringSupport : public CHeapObj<mtGC> { |
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friend class VMStructs; |
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G1CollectedHeap* _g1h; |
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// jstat performance counters |
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// incremental collections both young and mixed |
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CollectorCounters* _incremental_collection_counters; |
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// full stop-the-world collections |
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CollectorCounters* _full_collection_counters; |
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// young collection set counters. The _eden_counters, |
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// _from_counters, and _to_counters are associated with |
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// this "generational" counter. |
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GenerationCounters* _young_collection_counters; |
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// old collection set counters. The _old_space_counters |
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// below are associated with this "generational" counter. |
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GenerationCounters* _old_collection_counters; |
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// Counters for the capacity and used for |
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// the whole heap |
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HSpaceCounters* _old_space_counters; |
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// the young collection |
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HSpaceCounters* _eden_counters; |
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// the survivor collection (only one, _to_counters, is actively used) |
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HSpaceCounters* _from_counters; |
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HSpaceCounters* _to_counters; |
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// When it's appropriate to recalculate the various sizes (at the |
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// end of a GC, when a new eden region is allocated, etc.) we store |
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// them here so that we can easily report them when needed and not |
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// have to recalculate them every time. |
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size_t _overall_reserved; |
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size_t _overall_committed; |
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size_t _overall_used; |
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uint _young_region_num; |
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size_t _young_gen_committed; |
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size_t _eden_committed; |
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size_t _eden_used; |
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size_t _survivor_committed; |
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size_t _survivor_used; |
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size_t _old_committed; |
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size_t _old_used; |
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G1CollectedHeap* g1h() { return _g1h; } |
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// It returns x - y if x > y, 0 otherwise. |
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// As described in the comment above, some of the inputs to the |
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// calculations we have to do are obtained concurrently and hence |
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// may be inconsistent with each other. So, this provides a |
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// defensive way of performing the subtraction and avoids the value |
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// going negative (which would mean a very large result, given that |
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// the parameter are size_t). |
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static size_t subtract_up_to_zero(size_t x, size_t y) { |
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if (x > y) { |
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return x - y; |
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} else { |
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return 0; |
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} |
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} |
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// Recalculate all the sizes. |
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void recalculate_sizes(); |
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// Recalculate only what's necessary when a new eden region is allocated. |
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void recalculate_eden_size(); |
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public: |
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G1MonitoringSupport(G1CollectedHeap* g1h); |
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// Unfortunately, the jstat tool assumes that no space has 0 |
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// capacity. In our case, given that each space is logical, it's |
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// possible that no regions will be allocated to it, hence to have 0 |
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// capacity (e.g., if there are no survivor regions, the survivor |
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// space has 0 capacity). The way we deal with this is to always pad |
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// each capacity value we report to jstat by a very small amount to |
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// make sure that it's never zero. Given that we sometimes have to |
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// report a capacity of a generation that contains several spaces |
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// (e.g., young gen includes one eden, two survivor spaces), the |
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// mult parameter is provided in order to adding the appropriate |
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// padding multiple times so that the capacities add up correctly. |
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static size_t pad_capacity(size_t size_bytes, size_t mult = 1) { |
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return size_bytes + MinObjAlignmentInBytes * mult; |
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} |
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// Recalculate all the sizes from scratch and update all the jstat |
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// counters accordingly. |
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void update_sizes(); |
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// Recalculate only what's necessary when a new eden region is |
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// allocated and update any jstat counters that need to be updated. |
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void update_eden_size(); |
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CollectorCounters* incremental_collection_counters() { |
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return _incremental_collection_counters; |
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} |
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CollectorCounters* full_collection_counters() { |
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return _full_collection_counters; |
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} |
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GenerationCounters* young_collection_counters() { |
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return _young_collection_counters; |
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} |
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GenerationCounters* old_collection_counters() { |
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return _old_collection_counters; |
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} |
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HSpaceCounters* old_space_counters() { return _old_space_counters; } |
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HSpaceCounters* eden_counters() { return _eden_counters; } |
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HSpaceCounters* from_counters() { return _from_counters; } |
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HSpaceCounters* to_counters() { return _to_counters; } |
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// Monitoring support used by |
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// MemoryService |
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// jstat counters |
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// Tracing |
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size_t overall_reserved() { return _overall_reserved; } |
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size_t overall_committed() { return _overall_committed; } |
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size_t overall_used() { return _overall_used; } |
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size_t young_gen_committed() { return _young_gen_committed; } |
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size_t young_gen_max() { return overall_reserved(); } |
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size_t eden_space_committed() { return _eden_committed; } |
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size_t eden_space_used() { return _eden_used; } |
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size_t survivor_space_committed() { return _survivor_committed; } |
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size_t survivor_space_used() { return _survivor_used; } |
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size_t old_gen_committed() { return old_space_committed(); } |
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size_t old_gen_max() { return overall_reserved(); } |
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size_t old_space_committed() { return _old_committed; } |
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size_t old_space_used() { return _old_used; } |
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}; |
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class G1GenerationCounters: public GenerationCounters { |
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protected: |
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G1MonitoringSupport* _g1mm; |
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public: |
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G1GenerationCounters(G1MonitoringSupport* g1mm, |
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const char* name, int ordinal, int spaces, |
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size_t min_capacity, size_t max_capacity, |
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size_t curr_capacity); |
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}; |
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class G1YoungGenerationCounters: public G1GenerationCounters { |
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public: |
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G1YoungGenerationCounters(G1MonitoringSupport* g1mm, const char* name); |
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virtual void update_all(); |
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}; |
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class G1OldGenerationCounters: public G1GenerationCounters { |
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public: |
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G1OldGenerationCounters(G1MonitoringSupport* g1mm, const char* name); |
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virtual void update_all(); |
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}; |
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#endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1MONITORINGSUPPORT_HPP |