--- a/src/hotspot/share/gc/cms/parNewGeneration.hpp Fri Nov 08 14:54:17 2019 +0000
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,420 +0,0 @@
-/*
- * Copyright (c) 2001, 2019, 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_GC_CMS_PARNEWGENERATION_HPP
-#define SHARE_GC_CMS_PARNEWGENERATION_HPP
-
-#include "gc/cms/parOopClosures.hpp"
-#include "gc/serial/defNewGeneration.hpp"
-#include "gc/shared/copyFailedInfo.hpp"
-#include "gc/shared/gcTrace.hpp"
-#include "gc/shared/oopStorageParState.hpp"
-#include "gc/shared/plab.hpp"
-#include "gc/shared/preservedMarks.hpp"
-#include "gc/shared/taskqueue.hpp"
-#include "memory/padded.hpp"
-
-class ChunkArray;
-class CMSHeap;
-class ParScanWithoutBarrierClosure;
-class ParScanWithBarrierClosure;
-class ParRootScanWithoutBarrierClosure;
-class ParRootScanWithBarrierTwoGensClosure;
-class ParEvacuateFollowersClosure;
-class StrongRootsScope;
-
-// It would be better if these types could be kept local to the .cpp file,
-// but they must be here to allow ParScanClosure::do_oop_work to be defined
-// in genOopClosures.inline.hpp.
-
-typedef Padded<OopTaskQueue> ObjToScanQueue;
-typedef GenericTaskQueueSet<ObjToScanQueue, mtGC> ObjToScanQueueSet;
-
-class ParKeepAliveClosure: public DefNewGeneration::KeepAliveClosure {
- private:
- ParScanWeakRefClosure* _par_cl;
- protected:
- template <class T> void do_oop_work(T* p);
- public:
- ParKeepAliveClosure(ParScanWeakRefClosure* cl);
- virtual void do_oop(oop* p);
- virtual void do_oop(narrowOop* p);
-};
-
-// The state needed by thread performing parallel young-gen collection.
-class ParScanThreadState {
- friend class ParScanThreadStateSet;
- private:
- ObjToScanQueue *_work_queue;
- Stack<oop, mtGC>* const _overflow_stack;
- PreservedMarks* const _preserved_marks;
-
- PLAB _to_space_alloc_buffer;
-
- ParScanWithoutBarrierClosure _to_space_closure; // scan_without_gc_barrier
- ParScanWithBarrierClosure _old_gen_closure; // scan_with_gc_barrier
- ParRootScanWithoutBarrierClosure _to_space_root_closure; // scan_root_without_gc_barrier
- // Will be passed to process_roots to set its generation.
- ParRootScanWithBarrierTwoGensClosure _older_gen_closure;
- // This closure will always be bound to the old gen; it will be used
- // in evacuate_followers.
- ParRootScanWithBarrierTwoGensClosure _old_gen_root_closure; // scan_old_root_with_gc_barrier
- ParEvacuateFollowersClosure _evacuate_followers;
- DefNewGeneration::IsAliveClosure _is_alive_closure;
- ParScanWeakRefClosure _scan_weak_ref_closure;
- ParKeepAliveClosure _keep_alive_closure;
-
- Space* _to_space;
- Space* to_space() { return _to_space; }
-
- ParNewGeneration* _young_gen;
- ParNewGeneration* young_gen() const { return _young_gen; }
-
- Generation* _old_gen;
- Generation* old_gen() { return _old_gen; }
-
- HeapWord *_young_old_boundary;
-
- int _thread_num;
- AgeTable _ageTable;
-
- bool _to_space_full;
-
-#if TASKQUEUE_STATS
- size_t _term_attempts;
- size_t _overflow_refills;
- size_t _overflow_refill_objs;
-#endif // TASKQUEUE_STATS
-
- // Stats for promotion failure
- PromotionFailedInfo _promotion_failed_info;
-
- // Timing numbers.
- double _start;
- double _start_strong_roots;
- double _strong_roots_time;
- double _start_term;
- double _term_time;
-
- // Helper for trim_queues. Scans subset of an array and makes
- // remainder available for work stealing.
- void scan_partial_array_and_push_remainder(oop obj);
-
- // In support of CMS' parallel rescan of survivor space.
- ChunkArray* _survivor_chunk_array;
- ChunkArray* survivor_chunk_array() { return _survivor_chunk_array; }
-
- void record_survivor_plab(HeapWord* plab_start, size_t plab_word_size);
-
- ParScanThreadState(Space* to_space_, ParNewGeneration* gen_,
- Generation* old_gen_, int thread_num_,
- ObjToScanQueueSet* work_queue_set_,
- Stack<oop, mtGC>* overflow_stacks_,
- PreservedMarks* preserved_marks_,
- size_t desired_plab_sz_,
- TaskTerminator& term_);
-
- public:
- AgeTable* age_table() {return &_ageTable;}
-
- ObjToScanQueue* work_queue() { return _work_queue; }
-
- PreservedMarks* preserved_marks() const { return _preserved_marks; }
-
- PLAB* to_space_alloc_buffer() {
- return &_to_space_alloc_buffer;
- }
-
- ParEvacuateFollowersClosure& evacuate_followers_closure() { return _evacuate_followers; }
- DefNewGeneration::IsAliveClosure& is_alive_closure() { return _is_alive_closure; }
- ParScanWeakRefClosure& scan_weak_ref_closure() { return _scan_weak_ref_closure; }
- ParKeepAliveClosure& keep_alive_closure() { return _keep_alive_closure; }
- ParScanClosure& older_gen_closure() { return _older_gen_closure; }
- ParRootScanWithoutBarrierClosure& to_space_root_closure() { return _to_space_root_closure; };
-
- // Decrease queue size below "max_size".
- void trim_queues(int max_size);
-
- // Private overflow stack usage
- Stack<oop, mtGC>* overflow_stack() { return _overflow_stack; }
- bool take_from_overflow_stack();
- void push_on_overflow_stack(oop p);
-
- // Is new_obj a candidate for scan_partial_array_and_push_remainder method.
- inline bool should_be_partially_scanned(oop new_obj, oop old_obj) const;
-
- int thread_num() { return _thread_num; }
-
- // Allocate a to-space block of size "sz", or else return NULL.
- HeapWord* alloc_in_to_space_slow(size_t word_sz);
-
- inline HeapWord* alloc_in_to_space(size_t word_sz);
-
- HeapWord* young_old_boundary() { return _young_old_boundary; }
-
- void set_young_old_boundary(HeapWord *boundary) {
- _young_old_boundary = boundary;
- }
-
- // Undo the most recent allocation ("obj", of "word_sz").
- void undo_alloc_in_to_space(HeapWord* obj, size_t word_sz);
-
- // Promotion failure stats
- void register_promotion_failure(size_t sz) {
- _promotion_failed_info.register_copy_failure(sz);
- }
- PromotionFailedInfo& promotion_failed_info() {
- return _promotion_failed_info;
- }
- bool promotion_failed() {
- return _promotion_failed_info.has_failed();
- }
- void print_promotion_failure_size();
-
-#if TASKQUEUE_STATS
- TaskQueueStats & taskqueue_stats() const { return _work_queue->stats; }
-
- size_t term_attempts() const { return _term_attempts; }
- size_t overflow_refills() const { return _overflow_refills; }
- size_t overflow_refill_objs() const { return _overflow_refill_objs; }
-
- void note_term_attempt() { ++_term_attempts; }
- void note_overflow_refill(size_t objs) {
- ++_overflow_refills; _overflow_refill_objs += objs;
- }
-
- void reset_stats();
-#endif // TASKQUEUE_STATS
-
- void start_strong_roots() {
- _start_strong_roots = os::elapsedTime();
- }
- void end_strong_roots() {
- _strong_roots_time += (os::elapsedTime() - _start_strong_roots);
- }
- double strong_roots_time() const { return _strong_roots_time; }
- void start_term_time() {
- TASKQUEUE_STATS_ONLY(note_term_attempt());
- _start_term = os::elapsedTime();
- }
- void end_term_time() {
- _term_time += (os::elapsedTime() - _start_term);
- }
- double term_time() const { return _term_time; }
-
- double elapsed_time() const {
- return os::elapsedTime() - _start;
- }
-};
-
-class ParNewGenTask: public AbstractGangTask {
- private:
- ParNewGeneration* _young_gen;
- Generation* _old_gen;
- HeapWord* _young_old_boundary;
- class ParScanThreadStateSet* _state_set;
- StrongRootsScope* _strong_roots_scope;
-
-public:
- ParNewGenTask(ParNewGeneration* young_gen,
- Generation* old_gen,
- HeapWord* young_old_boundary,
- ParScanThreadStateSet* state_set,
- StrongRootsScope* strong_roots_scope);
-
- HeapWord* young_old_boundary() { return _young_old_boundary; }
-
- void work(uint worker_id);
-};
-
-class KeepAliveClosure: public DefNewGeneration::KeepAliveClosure {
- protected:
- template <class T> void do_oop_work(T* p);
- public:
- KeepAliveClosure(ScanWeakRefClosure* cl);
- virtual void do_oop(oop* p);
- virtual void do_oop(narrowOop* p);
-};
-
-template <typename OopClosureType1, typename OopClosureType2>
-class EvacuateFollowersClosureGeneral: public VoidClosure {
- private:
- CMSHeap* _heap;
- OopClosureType1* _scan_cur_or_nonheap;
- OopClosureType2* _scan_older;
- public:
- EvacuateFollowersClosureGeneral(CMSHeap* heap,
- OopClosureType1* cur,
- OopClosureType2* older);
- virtual void do_void();
-};
-
-// Closure for scanning ParNewGeneration.
-// Same as ScanClosure, except does parallel GC barrier.
-class ScanClosureWithParBarrier: public OopsInClassLoaderDataOrGenClosure {
- private:
- ParNewGeneration* _g;
- HeapWord* _boundary;
- bool _gc_barrier;
-
- template <class T> void do_oop_work(T* p);
-
- public:
- ScanClosureWithParBarrier(ParNewGeneration* g, bool gc_barrier);
- virtual void do_oop(oop* p);
- virtual void do_oop(narrowOop* p);
-};
-
-// Implements AbstractRefProcTaskExecutor for ParNew.
-class ParNewRefProcTaskExecutor: public AbstractRefProcTaskExecutor {
- private:
- ParNewGeneration& _young_gen;
- Generation& _old_gen;
- ParScanThreadStateSet& _state_set;
- public:
- ParNewRefProcTaskExecutor(ParNewGeneration& young_gen,
- Generation& old_gen,
- ParScanThreadStateSet& state_set)
- : _young_gen(young_gen), _old_gen(old_gen), _state_set(state_set)
- { }
-
- // Executes a task using worker threads.
- virtual void execute(ProcessTask& task, uint ergo_workers);
- // Switch to single threaded mode.
- virtual void set_single_threaded_mode();
-};
-
-
-// A Generation that does parallel young-gen collection.
-
-class ParNewGeneration: public DefNewGeneration {
- friend class ParNewGenTask;
- friend class ParNewRefProcTask;
- friend class ParNewRefProcTaskExecutor;
- friend class ParScanThreadStateSet;
- friend class ParEvacuateFollowersClosure;
-
- private:
- // The per-worker-thread work queues
- ObjToScanQueueSet* _task_queues;
-
- // Per-worker-thread local overflow stacks
- Stack<oop, mtGC>* _overflow_stacks;
-
- // Desired size of survivor space plab's
- PLABStats _plab_stats;
-
- // A list of from-space images of to-be-scanned objects, threaded through
- // klass-pointers (klass information already copied to the forwarded
- // image.) Manipulated with CAS.
- oopDesc* volatile _overflow_list;
- NOT_PRODUCT(ssize_t _num_par_pushes;)
-
- // This closure is used by the reference processor to filter out
- // references to live referent.
- DefNewGeneration::IsAliveClosure _is_alive_closure;
-
- // GC tracer that should be used during collection.
- ParNewTracer _gc_tracer;
-
- static oop real_forwardee_slow(oop obj);
- static void waste_some_time();
-
- void handle_promotion_failed(CMSHeap* gch, ParScanThreadStateSet& thread_state_set);
-
- protected:
-
- void restore_preserved_marks();
-
- public:
- ParNewGeneration(ReservedSpace rs,
- size_t initial_byte_size,
- size_t min_byte_size,
- size_t max_byte_size);
-
- ~ParNewGeneration() {
- for (uint i = 0; i < ParallelGCThreads; i++)
- delete _task_queues->queue(i);
-
- delete _task_queues;
- }
-
- virtual void ref_processor_init();
- virtual Generation::Name kind() { return Generation::ParNew; }
- virtual const char* name() const;
- virtual const char* short_name() const { return "ParNew"; }
-
- // override
- virtual bool refs_discovery_is_mt() const {
- return ParallelGCThreads > 1;
- }
-
- // Make the collection virtual.
- virtual void collect(bool full,
- bool clear_all_soft_refs,
- size_t size,
- bool is_tlab);
-
- // This needs to be visible to the closure function.
- // "obj" is the object to be copied, "m" is a recent value of its mark
- // that must not contain a forwarding pointer (though one might be
- // inserted in "obj"s mark word by a parallel thread).
- oop copy_to_survivor_space(ParScanThreadState* par_scan_state,
- oop obj, size_t obj_sz, markWord m);
-
- // in support of testing overflow code
- NOT_PRODUCT(int _overflow_counter;)
- NOT_PRODUCT(bool should_simulate_overflow();)
-
- // Accessor for overflow list
- oop overflow_list() { return _overflow_list; }
-
- // Push the given (from-space) object on the global overflow list.
- void push_on_overflow_list(oop from_space_obj, ParScanThreadState* par_scan_state);
-
- // If the global overflow list is non-empty, move some tasks from it
- // onto "work_q" (which need not be empty). No more than 1/4 of the
- // available space on "work_q" is used.
- bool take_from_overflow_list(ParScanThreadState* par_scan_state);
- bool take_from_overflow_list_work(ParScanThreadState* par_scan_state);
-
- // The task queues to be used by parallel GC threads.
- ObjToScanQueueSet* task_queues() {
- return _task_queues;
- }
-
- PLABStats* plab_stats() {
- return &_plab_stats;
- }
-
- size_t desired_plab_sz();
-
- const ParNewTracer* gc_tracer() const {
- return &_gc_tracer;
- }
-
- static oop real_forwardee(oop obj);
-};
-
-#endif // SHARE_GC_CMS_PARNEWGENERATION_HPP