| /* |
| * Copyright (c) 2015, 2016, 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. |
| * |
| */ |
| |
| #ifndef SHARE_VM_GC_G1_G1COLLECTORSTATE_HPP |
| #define SHARE_VM_GC_G1_G1COLLECTORSTATE_HPP |
| |
| #include "gc/g1/g1YCTypes.hpp" |
| #include "memory/allocation.hpp" |
| #include "utilities/globalDefinitions.hpp" |
| |
| // Various state variables that indicate |
| // the phase of the G1 collection. |
| class G1CollectorState VALUE_OBJ_CLASS_SPEC { |
| // Indicates whether we are in "full young" or "mixed" GC mode. |
| bool _gcs_are_young; |
| // Was the last GC "young"? |
| bool _last_gc_was_young; |
| // Is this the "last young GC" before we start doing mixed GCs? |
| // Set after a concurrent mark has completed. |
| bool _last_young_gc; |
| |
| // If initiate_conc_mark_if_possible() is set at the beginning of a |
| // pause, it is a suggestion that the pause should start a marking |
| // cycle by doing the initial-mark work. However, it is possible |
| // that the concurrent marking thread is still finishing up the |
| // previous marking cycle (e.g., clearing the next marking |
| // bitmap). If that is the case we cannot start a new cycle and |
| // we'll have to wait for the concurrent marking thread to finish |
| // what it is doing. In this case we will postpone the marking cycle |
| // initiation decision for the next pause. When we eventually decide |
| // to start a cycle, we will set _during_initial_mark_pause which |
| // will stay true until the end of the initial-mark pause and it's |
| // the condition that indicates that a pause is doing the |
| // initial-mark work. |
| volatile bool _during_initial_mark_pause; |
| |
| // At the end of a pause we check the heap occupancy and we decide |
| // whether we will start a marking cycle during the next pause. If |
| // we decide that we want to do that, we will set this parameter to |
| // true. So, this parameter will stay true between the end of a |
| // pause and the beginning of a subsequent pause (not necessarily |
| // the next one, see the comments on the next field) when we decide |
| // that we will indeed start a marking cycle and do the initial-mark |
| // work. |
| volatile bool _initiate_conc_mark_if_possible; |
| |
| // NOTE: if some of these are synonyms for others, |
| // the redundant fields should be eliminated. XXX |
| bool _during_marking; |
| bool _mark_in_progress; |
| bool _in_marking_window; |
| bool _in_marking_window_im; |
| |
| bool _full_collection; |
| |
| public: |
| G1CollectorState() : |
| _gcs_are_young(true), |
| _last_gc_was_young(false), |
| _last_young_gc(false), |
| |
| _during_initial_mark_pause(false), |
| _initiate_conc_mark_if_possible(false), |
| |
| _during_marking(false), |
| _mark_in_progress(false), |
| _in_marking_window(false), |
| _in_marking_window_im(false), |
| _full_collection(false) {} |
| |
| // Setters |
| void set_gcs_are_young(bool v) { _gcs_are_young = v; } |
| void set_last_gc_was_young(bool v) { _last_gc_was_young = v; } |
| void set_last_young_gc(bool v) { _last_young_gc = v; } |
| void set_during_initial_mark_pause(bool v) { _during_initial_mark_pause = v; } |
| void set_initiate_conc_mark_if_possible(bool v) { _initiate_conc_mark_if_possible = v; } |
| void set_during_marking(bool v) { _during_marking = v; } |
| void set_mark_in_progress(bool v) { _mark_in_progress = v; } |
| void set_in_marking_window(bool v) { _in_marking_window = v; } |
| void set_in_marking_window_im(bool v) { _in_marking_window_im = v; } |
| void set_full_collection(bool v) { _full_collection = v; } |
| |
| // Getters |
| bool gcs_are_young() const { return _gcs_are_young; } |
| bool last_gc_was_young() const { return _last_gc_was_young; } |
| bool last_young_gc() const { return _last_young_gc; } |
| bool during_initial_mark_pause() const { return _during_initial_mark_pause; } |
| bool initiate_conc_mark_if_possible() const { return _initiate_conc_mark_if_possible; } |
| bool during_marking() const { return _during_marking; } |
| bool mark_in_progress() const { return _mark_in_progress; } |
| bool in_marking_window() const { return _in_marking_window; } |
| bool in_marking_window_im() const { return _in_marking_window_im; } |
| bool full_collection() const { return _full_collection; } |
| |
| // Composite booleans (clients worry about flickering) |
| bool during_concurrent_mark() const { |
| return (_in_marking_window && !_in_marking_window_im); |
| } |
| |
| G1YCType yc_type() const { |
| if (during_initial_mark_pause()) { |
| return InitialMark; |
| } else if (mark_in_progress()) { |
| return DuringMark; |
| } else if (gcs_are_young()) { |
| return Normal; |
| } else { |
| return Mixed; |
| } |
| } |
| }; |
| |
| #endif // SHARE_VM_GC_G1_G1COLLECTORSTATE_HPP |