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

annotate src/share/vm/memory/sharedHeap.hpp @ 6725:da91efe96a93

6964458: Reimplement class meta-data storage to use native memory Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>

author	coleenp
date	Sat, 01 Sep 2012 13:25:18 -0400
parents	441e946dc1af
children	a08c80e9e1e5

rev	line source
0 a61af66fc99e Initial load duke parents: diff changeset	1 /*
6725 da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 4728 diff changeset	2 * Copyright (c) 2000, 2012, 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
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	72 // G1CollectedHeap::g1_process_strong_roots() calls
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	73 // process_strong_roots(false, // no scoping; this is parallel code
6725 da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 4728 diff changeset	74 // is_scavenging, so,
4095 bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	75 // &buf_scan_non_heap_roots,
6725 da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 4728 diff changeset	76 // &eager_scan_code_roots);
4095 bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	77 // which delegates to SharedHeap::process_strong_roots() and uses
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	78 // SubTasksDone* _process_strong_tasks to claim tasks.
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	79 // process_strong_roots() calls
6725 da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 4728 diff changeset	80 // rem_set()->younger_refs_iterate()
4095 bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	81 // 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	82 // CardTableModRefBS::par_non_clean_card_iterate_work(). This method
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	83 // uses SequentialSubTasksDone* _pst to claim tasks.
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	84 // Both SubTasksDone and SequentialSubTasksDone call their method
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	85 // 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	86 // 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	87 // finished the tasks are finished".
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	88 //
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	89 // 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	90 // 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	91 // 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	92 // 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	93 // setting _n_threads to 1.
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	94 //
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	95 // 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	96 // 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	97 // 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	98 // examples.
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	99 //
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	100 // 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	101 // 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	102 // (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	103 // on the partitioning done in the previous parallel scavenge).
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	104
0 a61af66fc99e Initial load duke parents: diff changeset	105 class SharedHeap : public CollectedHeap {
a61af66fc99e Initial load duke parents: diff changeset	106 friend class VMStructs;
a61af66fc99e Initial load duke parents: diff changeset	107
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 0 diff changeset	108 friend class VM_GC_Operation;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 0 diff changeset	109 friend class VM_CGC_Operation;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 0 diff changeset	110
0 a61af66fc99e Initial load duke parents: diff changeset	111 private:
a61af66fc99e Initial load duke parents: diff changeset	112 // For claiming strong_roots tasks.
a61af66fc99e Initial load duke parents: diff changeset	113 SubTasksDone* _process_strong_tasks;
a61af66fc99e Initial load duke parents: diff changeset	114
a61af66fc99e Initial load duke parents: diff changeset	115 protected:
a61af66fc99e Initial load duke parents: diff changeset	116 // There should be only a single instance of "SharedHeap" in a program.
a61af66fc99e Initial load duke parents: diff changeset	117 // This is enforced with the protected constructor below, which will also
a61af66fc99e Initial load duke parents: diff changeset	118 // set the static pointer "_sh" to that instance.
a61af66fc99e Initial load duke parents: diff changeset	119 static SharedHeap* _sh;
a61af66fc99e Initial load duke parents: diff changeset	120
a61af66fc99e Initial load duke parents: diff changeset	121 // and the Gen Remembered Set, at least one good enough to scan the perm
a61af66fc99e Initial load duke parents: diff changeset	122 // gen.
a61af66fc99e Initial load duke parents: diff changeset	123 GenRemSet* _rem_set;
a61af66fc99e Initial load duke parents: diff changeset	124
a61af66fc99e Initial load duke parents: diff changeset	125 // A gc policy, controls global gc resource issues
a61af66fc99e Initial load duke parents: diff changeset	126 CollectorPolicy *_collector_policy;
a61af66fc99e Initial load duke parents: diff changeset	127
a61af66fc99e Initial load duke parents: diff changeset	128 // See the discussion below, in the specification of the reader function
a61af66fc99e Initial load duke parents: diff changeset	129 // for this variable.
a61af66fc99e Initial load duke parents: diff changeset	130 int _strong_roots_parity;
a61af66fc99e Initial load duke parents: diff changeset	131
a61af66fc99e Initial load duke parents: diff changeset	132 // 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	133 FlexibleWorkGang* _workers;
0 a61af66fc99e Initial load duke parents: diff changeset	134
a61af66fc99e Initial load duke parents: diff changeset	135 // Full initialization is done in a concrete subtype's "initialize"
a61af66fc99e Initial load duke parents: diff changeset	136 // function.
a61af66fc99e Initial load duke parents: diff changeset	137 SharedHeap(CollectorPolicy* policy_);
a61af66fc99e Initial load duke parents: diff changeset	138
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 0 diff changeset	139 // Returns true if the calling thread holds the heap lock,
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 0 diff changeset	140 // 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	141 // by the vm thread doing a gc operation.
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 0 diff changeset	142 bool heap_lock_held_for_gc();
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 0 diff changeset	143 // 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	144 // operation.
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 0 diff changeset	145 bool _thread_holds_heap_lock_for_gc;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 0 diff changeset	146
0 a61af66fc99e Initial load duke parents: diff changeset	147 public:
a61af66fc99e Initial load duke parents: diff changeset	148 static SharedHeap* heap() { return _sh; }
a61af66fc99e Initial load duke parents: diff changeset	149
a61af66fc99e Initial load duke parents: diff changeset	150 void set_barrier_set(BarrierSet* bs);
4095 bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	151 SubTasksDone* process_strong_tasks() { return _process_strong_tasks; }
0 a61af66fc99e Initial load duke parents: diff changeset	152
a61af66fc99e Initial load duke parents: diff changeset	153 // Does operations required after initialization has been done.
a61af66fc99e Initial load duke parents: diff changeset	154 virtual void post_initialize();
a61af66fc99e Initial load duke parents: diff changeset	155
a61af66fc99e Initial load duke parents: diff changeset	156 // Initialization of ("weak") reference processing support
a61af66fc99e Initial load duke parents: diff changeset	157 virtual void ref_processing_init();
a61af66fc99e Initial load duke parents: diff changeset	158
a61af66fc99e Initial load duke parents: diff changeset	159 // 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	160 // generations in a fully generational heap.
0 a61af66fc99e Initial load duke parents: diff changeset	161 GenRemSet* rem_set() { return _rem_set; }
a61af66fc99e Initial load duke parents: diff changeset	162
a61af66fc99e Initial load duke parents: diff changeset	163 // Iteration functions.
6725 da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 4728 diff changeset	164 void oop_iterate(ExtendedOopClosure* cl) = 0;
0 a61af66fc99e Initial load duke parents: diff changeset	165
a61af66fc99e Initial load duke parents: diff changeset	166 // Same as above, restricted to a memory region.
6725 da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 4728 diff changeset	167 virtual void oop_iterate(MemRegion mr, ExtendedOopClosure* cl) = 0;
0 a61af66fc99e Initial load duke parents: diff changeset	168
a61af66fc99e Initial load duke parents: diff changeset	169 // Iterate over all objects allocated since the last collection, calling
a61af66fc99e Initial load duke parents: diff changeset	170 // "cl->do_object" on each. The heap must have been initialized properly
a61af66fc99e Initial load duke parents: diff changeset	171 // to support this function, or else this call will fail.
a61af66fc99e Initial load duke parents: diff changeset	172 virtual void object_iterate_since_last_GC(ObjectClosure* cl) = 0;
a61af66fc99e Initial load duke parents: diff changeset	173
a61af66fc99e Initial load duke parents: diff changeset	174 // Iterate over all spaces in use in the heap, in an undefined order.
a61af66fc99e Initial load duke parents: diff changeset	175 virtual void space_iterate(SpaceClosure* cl) = 0;
a61af66fc99e Initial load duke parents: diff changeset	176
a61af66fc99e Initial load duke parents: diff changeset	177 // A SharedHeap will contain some number of spaces. This finds the
a61af66fc99e Initial load duke parents: diff changeset	178 // space whose reserved area contains the given address, or else returns
a61af66fc99e Initial load duke parents: diff changeset	179 // NULL.
a61af66fc99e Initial load duke parents: diff changeset	180 virtual Space* space_containing(const void* addr) const = 0;
a61af66fc99e Initial load duke parents: diff changeset	181
a61af66fc99e Initial load duke parents: diff changeset	182 bool no_gc_in_progress() { return !is_gc_active(); }
a61af66fc99e Initial load duke parents: diff changeset	183
a61af66fc99e Initial load duke parents: diff changeset	184 // Some collectors will perform "process_strong_roots" in parallel.
a61af66fc99e Initial load duke parents: diff changeset	185 // Such a call will involve claiming some fine-grained tasks, such as
a61af66fc99e Initial load duke parents: diff changeset	186 // scanning of threads. To make this process simpler, we provide the
a61af66fc99e Initial load duke parents: diff changeset	187 // "strong_roots_parity()" method. Collectors that start parallel tasks
a61af66fc99e Initial load duke parents: diff changeset	188 // whose threads invoke "process_strong_roots" must
a61af66fc99e Initial load duke parents: diff changeset	189 // call "change_strong_roots_parity" in sequential code starting such a
a61af66fc99e Initial load duke parents: diff changeset	190 // task. (This also means that a parallel thread may only call
a61af66fc99e Initial load duke parents: diff changeset	191 // process_strong_roots once.)
a61af66fc99e Initial load duke parents: diff changeset	192 //
a61af66fc99e Initial load duke parents: diff changeset	193 // For calls to process_strong_roots by sequential code, the parity is
a61af66fc99e Initial load duke parents: diff changeset	194 // updated automatically.
a61af66fc99e Initial load duke parents: diff changeset	195 //
a61af66fc99e Initial load duke parents: diff changeset	196 // The idea is that objects representing fine-grained tasks, such as
a61af66fc99e Initial load duke parents: diff changeset	197 // threads, will contain a "parity" field. A task will is claimed in the
a61af66fc99e Initial load duke parents: diff changeset	198 // current "process_strong_roots" call only if its parity field is the
a61af66fc99e Initial load duke parents: diff changeset	199 // same as the "strong_roots_parity"; task claiming is accomplished by
a61af66fc99e Initial load duke parents: diff changeset	200 // updating the parity field to the strong_roots_parity with a CAS.
a61af66fc99e Initial load duke parents: diff changeset	201 //
a61af66fc99e Initial load duke parents: diff changeset	202 // If the client meats this spec, then strong_roots_parity() will have
a61af66fc99e Initial load duke parents: diff changeset	203 // the following properties:
a61af66fc99e Initial load duke parents: diff changeset	204 // a) to return a different value than was returned before the last
a61af66fc99e Initial load duke parents: diff changeset	205 // call to change_strong_roots_parity, and
a61af66fc99e Initial load duke parents: diff changeset	206 // c) to never return a distinguished value (zero) with which such
a61af66fc99e Initial load duke parents: diff changeset	207 // task-claiming variables may be initialized, to indicate "never
a61af66fc99e Initial load duke parents: diff changeset	208 // claimed".
989 148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	209 private:
0 a61af66fc99e Initial load duke parents: diff changeset	210 void change_strong_roots_parity();
989 148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	211 public:
0 a61af66fc99e Initial load duke parents: diff changeset	212 int strong_roots_parity() { return _strong_roots_parity; }
a61af66fc99e Initial load duke parents: diff changeset	213
989 148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	214 // Call these in sequential code around process_strong_roots.
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	215 // 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	216 // parallel tasks are enabled.
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	217 class StrongRootsScope : public MarkingCodeBlobClosure::MarkScope {
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	218 public:
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	219 StrongRootsScope(SharedHeap* outer, bool activate = true);
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	220 ~StrongRootsScope();
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	221 };
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	222 friend class StrongRootsScope;
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	223
0 a61af66fc99e Initial load duke parents: diff changeset	224 enum ScanningOption {
a61af66fc99e Initial load duke parents: diff changeset	225 SO_None = 0x0,
a61af66fc99e Initial load duke parents: diff changeset	226 SO_AllClasses = 0x1,
a61af66fc99e Initial load duke parents: diff changeset	227 SO_SystemClasses = 0x2,
3293 1f4413413144 7039089: G1: changeset for 7037276 broke heap verification, and related cleanups ysr parents: 1972 diff changeset	228 SO_Strings = 0x4,
1f4413413144 7039089: G1: changeset for 7037276 broke heap verification, and related cleanups ysr parents: 1972 diff changeset	229 SO_CodeCache = 0x8
0 a61af66fc99e Initial load duke parents: diff changeset	230 };
a61af66fc99e Initial load duke parents: diff changeset	231
1833 8b10f48633dc 6984287: Regularize how GC parallel workers are specified. jmasa parents: 1552 diff changeset	232 FlexibleWorkGang* workers() const { return _workers; }
0 a61af66fc99e Initial load duke parents: diff changeset	233
a61af66fc99e Initial load duke parents: diff changeset	234 // 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	235 // The "so" argument determines which roots the closure is applied to:
0 a61af66fc99e Initial load duke parents: diff changeset	236 // "SO_None" does none;
a61af66fc99e Initial load duke parents: diff changeset	237 // "SO_AllClasses" applies the closure to all entries in the SystemDictionary;
a61af66fc99e Initial load duke parents: diff changeset	238 // "SO_SystemClasses" to all the "system" classes and loaders;
a61af66fc99e Initial load duke parents: diff changeset	239 // "SO_Strings" applies the closure to all entries in StringTable;
a61af66fc99e Initial load duke parents: diff changeset	240 // "SO_CodeCache" applies the closure to all elements of the CodeCache.
989 148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	241 void process_strong_roots(bool activate_scope,
6725 da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 4728 diff changeset	242 bool is_scavenging,
0 a61af66fc99e Initial load duke parents: diff changeset	243 ScanningOption so,
a61af66fc99e Initial load duke parents: diff changeset	244 OopClosure* roots,
989 148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	245 CodeBlobClosure* code_roots,
6725 da91efe96a93 6964458: Reimplement class meta-data storage to use native memory coleenp parents: 4728 diff changeset	246 KlassClosure* klass_closure);
0 a61af66fc99e Initial load duke parents: diff changeset	247
a61af66fc99e Initial load duke parents: diff changeset	248 // Apply "blk" to all the weak roots of the system. These include
a61af66fc99e Initial load duke parents: diff changeset	249 // JNI weak roots, the code cache, system dictionary, symbol table,
a61af66fc99e Initial load duke parents: diff changeset	250 // string table.
a61af66fc99e Initial load duke parents: diff changeset	251 void process_weak_roots(OopClosure* root_closure,
989 148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	252 CodeBlobClosure* code_roots,
0 a61af66fc99e Initial load duke parents: diff changeset	253 OopClosure* non_root_closure);
a61af66fc99e Initial load duke parents: diff changeset	254
a61af66fc99e Initial load duke parents: diff changeset	255 // The functions below are helper functions that a subclass of
a61af66fc99e Initial load duke parents: diff changeset	256 // "SharedHeap" can use in the implementation of its virtual
a61af66fc99e Initial load duke parents: diff changeset	257 // functions.
a61af66fc99e Initial load duke parents: diff changeset	258
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 0 diff changeset	259 public:
0 a61af66fc99e Initial load duke parents: diff changeset	260
a61af66fc99e Initial load duke parents: diff changeset	261 // Do anything common to GC's.
a61af66fc99e Initial load duke parents: diff changeset	262 virtual void gc_prologue(bool full) = 0;
a61af66fc99e Initial load duke parents: diff changeset	263 virtual void gc_epilogue(bool full) = 0;
a61af66fc99e Initial load duke parents: diff changeset	264
4095 bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	265 // Sets the number of parallel threads that will be doing tasks
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	266 // (such as process strong roots) subsequently.
4728 441e946dc1af 7121618: Change type of number of GC workers to unsigned int. jmasa parents: 4095 diff changeset	267 virtual void set_par_threads(uint t);
4095 bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	268
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	269 int n_termination();
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	270 void set_n_termination(int t);
bca17e38de00 6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads jmasa parents: 3293 diff changeset	271
0 a61af66fc99e Initial load duke parents: diff changeset	272 //
a61af66fc99e Initial load duke parents: diff changeset	273 // New methods from CollectedHeap
a61af66fc99e Initial load duke parents: diff changeset	274 //
a61af66fc99e Initial load duke parents: diff changeset	275
a61af66fc99e Initial load duke parents: diff changeset	276 // Some utilities.
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 0 diff changeset	277 void print_size_transition(outputStream* out,
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 0 diff changeset	278 size_t bytes_before,
0 a61af66fc99e Initial load duke parents: diff changeset	279 size_t bytes_after,
a61af66fc99e Initial load duke parents: diff changeset	280 size_t capacity);
a61af66fc99e Initial load duke parents: diff changeset	281 };
1972 f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1833 diff changeset	282
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1833 diff changeset	283 #endif // SHARE_VM_MEMORY_SHAREDHEAP_HPP

Mercurial > hg > truffle

annotate src/share/vm/memory/sharedHeap.hpp @ 6725:da91efe96a93