truffle: src/share/vm/memory/sharedHeap.hpp annotate

annotate src/share/vm/memory/sharedHeap.hpp @ 20278:2c6ef90f030a

8049421: G1 Class Unloading after completing a concurrent mark cycle Reviewed-by: tschatzl, ehelin, brutisso, coleenp, roland, iveresov Contributed-by: stefan.karlsson@oracle.com, mikael.gerdin@oracle.com

author	stefank
date	Mon, 07 Jul 2014 10:12:40 +0200
parents	30c99d8e0f02
children	7848fc12602b

rev	line source
0 a61af66fc99e Initial load duke parents: diff changeset	1 /*
17467 55fb97c4c58d 8029233: Update copyright year to match last edit in jdk8 hotspot repository for 2013 mikael parents: 11096 diff changeset	2 * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
0 a61af66fc99e Initial load duke parents: diff changeset	3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
a61af66fc99e Initial load duke parents: diff changeset	4 *
a61af66fc99e Initial load duke parents: diff changeset	5 * This code is free software; you can redistribute it and/or modify it
a61af66fc99e Initial load duke parents: diff changeset	6 * under the terms of the GNU General Public License version 2 only, as
a61af66fc99e Initial load duke parents: diff changeset	7 * published by the Free Software Foundation.
a61af66fc99e Initial load duke parents: diff changeset	8 *
a61af66fc99e Initial load duke parents: diff changeset	9 * This code is distributed in the hope that it will be useful, but WITHOUT
a61af66fc99e Initial load duke parents: diff changeset	10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
a61af66fc99e Initial load duke parents: diff changeset	11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
a61af66fc99e Initial load duke parents: diff changeset	12 * version 2 for more details (a copy is included in the LICENSE file that
a61af66fc99e Initial load duke parents: diff changeset	13 * accompanied this code).
a61af66fc99e Initial load duke parents: diff changeset	14 *
a61af66fc99e Initial load duke parents: diff changeset	15 * You should have received a copy of the GNU General Public License version
a61af66fc99e Initial load duke parents: diff changeset	16 * 2 along with this work; if not, write to the Free Software Foundation,
a61af66fc99e Initial load duke parents: diff changeset	17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
a61af66fc99e Initial load duke parents: diff changeset	18 *
1552 c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories trims parents: 1088 diff changeset	19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories trims parents: 1088 diff changeset	20 * or visit www.oracle.com if you need additional information or have any
c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories trims parents: 1088 diff changeset	21 * questions.
0 a61af66fc99e Initial load duke parents: diff changeset	22 *
a61af66fc99e Initial load duke parents: diff changeset	23 */
a61af66fc99e Initial load duke parents: diff changeset	24
1972 f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1833 diff changeset	25 #ifndef SHARE_VM_MEMORY_SHAREDHEAP_HPP
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1833 diff changeset	26 #define SHARE_VM_MEMORY_SHAREDHEAP_HPP
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1833 diff changeset	27
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1833 diff changeset	28 #include "gc_interface/collectedHeap.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1833 diff changeset	29 #include "memory/generation.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1833 diff changeset	30
0 a61af66fc99e Initial load duke parents: diff changeset	31 // A "SharedHeap" is an implementation of a java heap for HotSpot. This
a61af66fc99e Initial load duke parents: diff changeset	32 // is an abstract class: there may be many different kinds of heaps. This
a61af66fc99e Initial load duke parents: diff changeset	33 // class defines the functions that a heap must implement, and contains
a61af66fc99e Initial load duke parents: diff changeset	34 // infrastructure common to all heaps.
a61af66fc99e Initial load duke parents: diff changeset	35
a61af66fc99e Initial load duke parents: diff changeset	36 class Generation;
a61af66fc99e Initial load duke parents: diff changeset	37 class BarrierSet;
a61af66fc99e Initial load duke parents: diff changeset	38 class GenRemSet;
a61af66fc99e Initial load duke parents: diff changeset	39 class Space;
a61af66fc99e Initial load duke parents: diff changeset	40 class SpaceClosure;
a61af66fc99e Initial load duke parents: diff changeset	41 class OopClosure;
a61af66fc99e Initial load duke parents: diff changeset	42 class OopsInGenClosure;
a61af66fc99e Initial load duke parents: diff changeset	43 class ObjectClosure;
a61af66fc99e Initial load duke parents: diff changeset	44 class SubTasksDone;
a61af66fc99e Initial load duke parents: diff changeset	45 class WorkGang;
1833 8b10f48633dc 6984287: Regularize how GC parallel workers are specified. jmasa parents: 1552 diff changeset	46 class FlexibleWorkGang;
0 a61af66fc99e Initial load duke parents: diff changeset	47 class CollectorPolicy;
6725 da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 4728 diff changeset	48 class KlassClosure;
0 a61af66fc99e Initial load duke parents: diff changeset	49
4095 bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	50 // Note on use of FlexibleWorkGang's for GC.
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	51 // There are three places where task completion is determined.
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	52 // In
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	53 // 1) ParallelTaskTerminator::offer_termination() where _n_threads
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	54 // must be set to the correct value so that count of workers that
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	55 // have offered termination will exactly match the number
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	56 // working on the task. Tasks such as those derived from GCTask
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	57 // use ParallelTaskTerminator's. Tasks that want load balancing
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	58 // by work stealing use this method to gauge completion.
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	59 // 2) SubTasksDone has a variable _n_threads that is used in
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	60 // all_tasks_completed() to determine completion. all_tasks_complete()
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	61 // counts the number of tasks that have been done and then reset
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	62 // the SubTasksDone so that it can be used again. When the number of
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	63 // tasks is set to the number of GC workers, then _n_threads must
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	64 // be set to the number of active GC workers. G1CollectedHeap,
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	65 // HRInto_G1RemSet, GenCollectedHeap and SharedHeap have SubTasksDone.
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	66 // This seems too many.
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	67 // 3) SequentialSubTasksDone has an _n_threads that is used in
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	68 // a way similar to SubTasksDone and has the same dependency on the
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	69 // number of active GC workers. CompactibleFreeListSpace and Space
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	70 // have SequentialSubTasksDone's.
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	71 // Example of using SubTasksDone and SequentialSubTasksDone
20278 2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	72 // G1CollectedHeap::g1_process_roots()
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	73 // to SharedHeap::process_roots() and uses
4095 bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	74 // SubTasksDone* _process_strong_tasks to claim tasks.
20278 2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	75 // process_roots() calls
6725 da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 4728 diff changeset	76 // rem_set()->younger_refs_iterate()
4095 bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	77 // to scan the card table and which eventually calls down into
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	78 // CardTableModRefBS::par_non_clean_card_iterate_work(). This method
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	79 // uses SequentialSubTasksDone* _pst to claim tasks.
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	80 // Both SubTasksDone and SequentialSubTasksDone call their method
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	81 // all_tasks_completed() to count the number of GC workers that have
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	82 // finished their work. That logic is "when all the workers are
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	83 // finished the tasks are finished".
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	84 //
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	85 // The pattern that appears in the code is to set _n_threads
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	86 // to a value > 1 before a task that you would like executed in parallel
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	87 // and then to set it to 0 after that task has completed. A value of
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	88 // 0 is a "special" value in set_n_threads() which translates to
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	89 // setting _n_threads to 1.
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	90 //
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	91 // Some code uses _n_terminiation to decide if work should be done in
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	92 // parallel. The notorious possibly_parallel_oops_do() in threads.cpp
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	93 // is an example of such code. Look for variable "is_par" for other
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	94 // examples.
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	95 //
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	96 // The active_workers is not reset to 0 after a parallel phase. It's
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	97 // value may be used in later phases and in one instance at least
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	98 // (the parallel remark) it has to be used (the parallel remark depends
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	99 // on the partitioning done in the previous parallel scavenge).
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	100
0 a61af66fc99e Initial load duke parents: diff changeset	101 class SharedHeap : public CollectedHeap {
a61af66fc99e Initial load duke parents: diff changeset	102 friend class VMStructs;
a61af66fc99e Initial load duke parents: diff changeset	103
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 0 diff changeset	104 friend class VM_GC_Operation;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 0 diff changeset	105 friend class VM_CGC_Operation;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 0 diff changeset	106
0 a61af66fc99e Initial load duke parents: diff changeset	107 private:
a61af66fc99e Initial load duke parents: diff changeset	108 // For claiming strong_roots tasks.
a61af66fc99e Initial load duke parents: diff changeset	109 SubTasksDone* _process_strong_tasks;
a61af66fc99e Initial load duke parents: diff changeset	110
a61af66fc99e Initial load duke parents: diff changeset	111 protected:
a61af66fc99e Initial load duke parents: diff changeset	112 // There should be only a single instance of "SharedHeap" in a program.
a61af66fc99e Initial load duke parents: diff changeset	113 // This is enforced with the protected constructor below, which will also
a61af66fc99e Initial load duke parents: diff changeset	114 // set the static pointer "_sh" to that instance.
a61af66fc99e Initial load duke parents: diff changeset	115 static SharedHeap* _sh;
a61af66fc99e Initial load duke parents: diff changeset	116
a61af66fc99e Initial load duke parents: diff changeset	117 // and the Gen Remembered Set, at least one good enough to scan the perm
a61af66fc99e Initial load duke parents: diff changeset	118 // gen.
a61af66fc99e Initial load duke parents: diff changeset	119 GenRemSet* _rem_set;
a61af66fc99e Initial load duke parents: diff changeset	120
a61af66fc99e Initial load duke parents: diff changeset	121 // A gc policy, controls global gc resource issues
a61af66fc99e Initial load duke parents: diff changeset	122 CollectorPolicy *_collector_policy;
a61af66fc99e Initial load duke parents: diff changeset	123
a61af66fc99e Initial load duke parents: diff changeset	124 // See the discussion below, in the specification of the reader function
a61af66fc99e Initial load duke parents: diff changeset	125 // for this variable.
a61af66fc99e Initial load duke parents: diff changeset	126 int _strong_roots_parity;
a61af66fc99e Initial load duke parents: diff changeset	127
a61af66fc99e Initial load duke parents: diff changeset	128 // If we're doing parallel GC, use this gang of threads.
1833 8b10f48633dc 6984287: Regularize how GC parallel workers are specified. jmasa parents: 1552 diff changeset	129 FlexibleWorkGang* _workers;
0 a61af66fc99e Initial load duke parents: diff changeset	130
a61af66fc99e Initial load duke parents: diff changeset	131 // Full initialization is done in a concrete subtype's "initialize"
a61af66fc99e Initial load duke parents: diff changeset	132 // function.
a61af66fc99e Initial load duke parents: diff changeset	133 SharedHeap(CollectorPolicy* policy_);
a61af66fc99e Initial load duke parents: diff changeset	134
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 0 diff changeset	135 // Returns true if the calling thread holds the heap lock,
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 0 diff changeset	136 // or the calling thread is a par gc thread and the heap_lock is held
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 0 diff changeset	137 // by the vm thread doing a gc operation.
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 0 diff changeset	138 bool heap_lock_held_for_gc();
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 0 diff changeset	139 // True if the heap_lock is held by the a non-gc thread invoking a gc
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 0 diff changeset	140 // operation.
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 0 diff changeset	141 bool _thread_holds_heap_lock_for_gc;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 0 diff changeset	142
0 a61af66fc99e Initial load duke parents: diff changeset	143 public:
a61af66fc99e Initial load duke parents: diff changeset	144 static SharedHeap* heap() { return _sh; }
a61af66fc99e Initial load duke parents: diff changeset	145
a61af66fc99e Initial load duke parents: diff changeset	146 void set_barrier_set(BarrierSet* bs);
4095 bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	147 SubTasksDone* process_strong_tasks() { return _process_strong_tasks; }
0 a61af66fc99e Initial load duke parents: diff changeset	148
a61af66fc99e Initial load duke parents: diff changeset	149 // Does operations required after initialization has been done.
a61af66fc99e Initial load duke parents: diff changeset	150 virtual void post_initialize();
a61af66fc99e Initial load duke parents: diff changeset	151
a61af66fc99e Initial load duke parents: diff changeset	152 // Initialization of ("weak") reference processing support
a61af66fc99e Initial load duke parents: diff changeset	153 virtual void ref_processing_init();
a61af66fc99e Initial load duke parents: diff changeset	154
a61af66fc99e Initial load duke parents: diff changeset	155 // This function returns the "GenRemSet" object that allows us to scan
6725 da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 4728 diff changeset	156 // generations in a fully generational heap.
0 a61af66fc99e Initial load duke parents: diff changeset	157 GenRemSet* rem_set() { return _rem_set; }
a61af66fc99e Initial load duke parents: diff changeset	158
a61af66fc99e Initial load duke parents: diff changeset	159 // Iteration functions.
6725 da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 4728 diff changeset	160 void oop_iterate(ExtendedOopClosure* cl) = 0;
0 a61af66fc99e Initial load duke parents: diff changeset	161
a61af66fc99e Initial load duke parents: diff changeset	162 // Iterate over all spaces in use in the heap, in an undefined order.
a61af66fc99e Initial load duke parents: diff changeset	163 virtual void space_iterate(SpaceClosure* cl) = 0;
a61af66fc99e Initial load duke parents: diff changeset	164
a61af66fc99e Initial load duke parents: diff changeset	165 // A SharedHeap will contain some number of spaces. This finds the
a61af66fc99e Initial load duke parents: diff changeset	166 // space whose reserved area contains the given address, or else returns
a61af66fc99e Initial load duke parents: diff changeset	167 // NULL.
a61af66fc99e Initial load duke parents: diff changeset	168 virtual Space* space_containing(const void* addr) const = 0;
a61af66fc99e Initial load duke parents: diff changeset	169
a61af66fc99e Initial load duke parents: diff changeset	170 bool no_gc_in_progress() { return !is_gc_active(); }
a61af66fc99e Initial load duke parents: diff changeset	171
a61af66fc99e Initial load duke parents: diff changeset	172 // Some collectors will perform "process_strong_roots" in parallel.
a61af66fc99e Initial load duke parents: diff changeset	173 // Such a call will involve claiming some fine-grained tasks, such as
a61af66fc99e Initial load duke parents: diff changeset	174 // scanning of threads. To make this process simpler, we provide the
a61af66fc99e Initial load duke parents: diff changeset	175 // "strong_roots_parity()" method. Collectors that start parallel tasks
a61af66fc99e Initial load duke parents: diff changeset	176 // whose threads invoke "process_strong_roots" must
a61af66fc99e Initial load duke parents: diff changeset	177 // call "change_strong_roots_parity" in sequential code starting such a
a61af66fc99e Initial load duke parents: diff changeset	178 // task. (This also means that a parallel thread may only call
a61af66fc99e Initial load duke parents: diff changeset	179 // process_strong_roots once.)
a61af66fc99e Initial load duke parents: diff changeset	180 //
20278 2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	181 // For calls to process_roots by sequential code, the parity is
0 a61af66fc99e Initial load duke parents: diff changeset	182 // updated automatically.
a61af66fc99e Initial load duke parents: diff changeset	183 //
a61af66fc99e Initial load duke parents: diff changeset	184 // The idea is that objects representing fine-grained tasks, such as
a61af66fc99e Initial load duke parents: diff changeset	185 // threads, will contain a "parity" field. A task will is claimed in the
20278 2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	186 // current "process_roots" call only if its parity field is the
0 a61af66fc99e Initial load duke parents: diff changeset	187 // same as the "strong_roots_parity"; task claiming is accomplished by
a61af66fc99e Initial load duke parents: diff changeset	188 // updating the parity field to the strong_roots_parity with a CAS.
a61af66fc99e Initial load duke parents: diff changeset	189 //
a61af66fc99e Initial load duke parents: diff changeset	190 // If the client meats this spec, then strong_roots_parity() will have
a61af66fc99e Initial load duke parents: diff changeset	191 // the following properties:
a61af66fc99e Initial load duke parents: diff changeset	192 // a) to return a different value than was returned before the last
a61af66fc99e Initial load duke parents: diff changeset	193 // call to change_strong_roots_parity, and
a61af66fc99e Initial load duke parents: diff changeset	194 // c) to never return a distinguished value (zero) with which such
a61af66fc99e Initial load duke parents: diff changeset	195 // task-claiming variables may be initialized, to indicate "never
a61af66fc99e Initial load duke parents: diff changeset	196 // claimed".
989 148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	197 public:
0 a61af66fc99e Initial load duke parents: diff changeset	198 int strong_roots_parity() { return _strong_roots_parity; }
a61af66fc99e Initial load duke parents: diff changeset	199
20278 2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	200 // Call these in sequential code around process_roots.
989 148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	201 // strong_roots_prologue calls change_strong_roots_parity, if
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	202 // parallel tasks are enabled.
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	203 class StrongRootsScope : public MarkingCodeBlobClosure::MarkScope {
20278 2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	204 // Used to implement the Thread work barrier.
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	205 static Monitor* _lock;
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	206
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	207 SharedHeap* _sh;
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	208 volatile jint _n_workers_done_with_threads;
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	209
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	210 public:
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	211 StrongRootsScope(SharedHeap* heap, bool activate = true);
989 148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	212 ~StrongRootsScope();
20278 2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	213
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	214 // Mark that this thread is done with the Threads work.
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	215 void mark_worker_done_with_threads(uint n_workers);
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	216 // Wait until all n_workers are done with the Threads work.
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	217 void wait_until_all_workers_done_with_threads(uint n_workers);
989 148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	218 };
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	219 friend class StrongRootsScope;
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	220
20278 2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	221 // The current active StrongRootScope
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	222 StrongRootsScope* _strong_roots_scope;
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	223
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	224 StrongRootsScope* active_strong_roots_scope() const;
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	225
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	226 private:
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	227 void register_strong_roots_scope(StrongRootsScope* scope);
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	228 void unregister_strong_roots_scope(StrongRootsScope* scope);
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	229 void change_strong_roots_parity();
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	230
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	231 public:
0 a61af66fc99e Initial load duke parents: diff changeset	232 enum ScanningOption {
20278 2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	233 SO_None = 0x0,
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	234 SO_AllCodeCache = 0x8,
20254 9fec19bb0659 8032379: Remove the is_scavenging flag to process_strong_roots mgerdin parents: 17467 diff changeset	235 SO_ScavengeCodeCache = 0x10
0 a61af66fc99e Initial load duke parents: diff changeset	236 };
a61af66fc99e Initial load duke parents: diff changeset	237
1833 8b10f48633dc 6984287: Regularize how GC parallel workers are specified. jmasa parents: 1552 diff changeset	238 FlexibleWorkGang* workers() const { return _workers; }
0 a61af66fc99e Initial load duke parents: diff changeset	239
a61af66fc99e Initial load duke parents: diff changeset	240 // Invoke the "do_oop" method the closure "roots" on all root locations.
6725 da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 4728 diff changeset	241 // The "so" argument determines which roots the closure is applied to:
0 a61af66fc99e Initial load duke parents: diff changeset	242 // "SO_None" does none;
20254 9fec19bb0659 8032379: Remove the is_scavenging flag to process_strong_roots mgerdin parents: 17467 diff changeset	243 // "SO_AllCodeCache" applies the closure to all elements of the CodeCache.
9fec19bb0659 8032379: Remove the is_scavenging flag to process_strong_roots mgerdin parents: 17467 diff changeset	244 // "SO_ScavengeCodeCache" applies the closure to elements on the scavenge root list in the CodeCache.
20278 2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	245 void process_roots(bool activate_scope,
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	246 ScanningOption so,
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	247 OopClosure* strong_roots,
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	248 OopClosure* weak_roots,
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	249 CLDClosure* strong_cld_closure,
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	250 CLDClosure* weak_cld_closure,
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	251 CodeBlobClosure* code_roots);
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	252 void process_all_roots(bool activate_scope,
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	253 ScanningOption so,
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	254 OopClosure* roots,
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	255 CLDClosure* cld_closure,
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	256 CodeBlobClosure* code_roots);
989 148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	257 void process_strong_roots(bool activate_scope,
0 a61af66fc99e Initial load duke parents: diff changeset	258 ScanningOption so,
a61af66fc99e Initial load duke parents: diff changeset	259 OopClosure* roots,
20278 2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	260 CLDClosure* cld_closure,
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	261 CodeBlobClosure* code_roots);
2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	262
0 a61af66fc99e Initial load duke parents: diff changeset	263
20258 64ac9c55d666 8034764: Use process_strong_roots to adjust the StringTable stefank parents: 20257 diff changeset	264 // Apply "root_closure" to the JNI weak roots..
20257 7426d8d76305 8034761: Remove the do_code_roots parameter from process_strong_roots stefank parents: 20254 diff changeset	265 void process_weak_roots(OopClosure* root_closure);
0 a61af66fc99e Initial load duke parents: diff changeset	266
a61af66fc99e Initial load duke parents: diff changeset	267 // The functions below are helper functions that a subclass of
a61af66fc99e Initial load duke parents: diff changeset	268 // "SharedHeap" can use in the implementation of its virtual
a61af66fc99e Initial load duke parents: diff changeset	269 // functions.
a61af66fc99e Initial load duke parents: diff changeset	270
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 0 diff changeset	271 public:
0 a61af66fc99e Initial load duke parents: diff changeset	272
a61af66fc99e Initial load duke parents: diff changeset	273 // Do anything common to GC's.
a61af66fc99e Initial load duke parents: diff changeset	274 virtual void gc_prologue(bool full) = 0;
a61af66fc99e Initial load duke parents: diff changeset	275 virtual void gc_epilogue(bool full) = 0;
a61af66fc99e Initial load duke parents: diff changeset	276
4095 bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	277 // Sets the number of parallel threads that will be doing tasks
20278 2c6ef90f030a 8049421: G1 Class Unloading after completing a concurrent mark cycle stefank parents: 20264 diff changeset	278 // (such as process roots) subsequently.
4728 441e946dc1af 7121618: Change type of number of GC workers to unsigned int. jmasa parents: 4095 diff changeset	279 virtual void set_par_threads(uint t);
4095 bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	280
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	281 int n_termination();
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	282 void set_n_termination(int t);
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	283
0 a61af66fc99e Initial load duke parents: diff changeset	284 //
a61af66fc99e Initial load duke parents: diff changeset	285 // New methods from CollectedHeap
a61af66fc99e Initial load duke parents: diff changeset	286 //
a61af66fc99e Initial load duke parents: diff changeset	287
a61af66fc99e Initial load duke parents: diff changeset	288 // Some utilities.
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 0 diff changeset	289 void print_size_transition(outputStream* out,
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 0 diff changeset	290 size_t bytes_before,
0 a61af66fc99e Initial load duke parents: diff changeset	291 size_t bytes_after,
a61af66fc99e Initial load duke parents: diff changeset	292 size_t capacity);
a61af66fc99e Initial load duke parents: diff changeset	293 };
1972 f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1833 diff changeset	294
20257 7426d8d76305 8034761: Remove the do_code_roots parameter from process_strong_roots stefank parents: 20254 diff changeset	295 inline SharedHeap::ScanningOption operator\|(SharedHeap::ScanningOption so0, SharedHeap::ScanningOption so1) {
7426d8d76305 8034761: Remove the do_code_roots parameter from process_strong_roots stefank parents: 20254 diff changeset	296 return static_cast<SharedHeap::ScanningOption>(static_cast<int>(so0) \| static_cast<int>(so1));
7426d8d76305 8034761: Remove the do_code_roots parameter from process_strong_roots stefank parents: 20254 diff changeset	297 }
7426d8d76305 8034761: Remove the do_code_roots parameter from process_strong_roots stefank parents: 20254 diff changeset	298
1972 f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1833 diff changeset	299 #endif // SHARE_VM_MEMORY_SHAREDHEAP_HPP

Mercurial > hg > truffle

annotate src/share/vm/memory/sharedHeap.hpp @ 20278:2c6ef90f030a