179 lines
6.3 KiB
C++
179 lines
6.3 KiB
C++
/*
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* Copyright (c) 2001, 2015, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#ifndef SHARE_VM_GC_G1_G1REMSET_HPP
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#define SHARE_VM_GC_G1_G1REMSET_HPP
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#include "gc/g1/g1RemSetSummary.hpp"
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// A G1RemSet provides ways of iterating over pointers into a selected
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// collection set.
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class G1CollectedHeap;
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class ConcurrentG1Refine;
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class G1ParPushHeapRSClosure;
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// A G1RemSet in which each heap region has a rem set that records the
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// external heap references into it. Uses a mod ref bs to track updates,
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// so that they can be used to update the individual region remsets.
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class G1RemSet: public CHeapObj<mtGC> {
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private:
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G1RemSetSummary _prev_period_summary;
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protected:
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G1CollectedHeap* _g1;
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size_t _conc_refine_cards;
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uint n_workers();
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protected:
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enum SomePrivateConstants {
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UpdateRStoMergeSync = 0,
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MergeRStoDoDirtySync = 1,
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DoDirtySync = 2,
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LastSync = 3,
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SeqTask = 0,
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NumSeqTasks = 1
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};
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CardTableModRefBS* _ct_bs;
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G1CollectorPolicy* _g1p;
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ConcurrentG1Refine* _cg1r;
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size_t* _cards_scanned;
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size_t _total_cards_scanned;
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// Used for caching the closure that is responsible for scanning
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// references into the collection set.
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G1ParPushHeapRSClosure** _cset_rs_update_cl;
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// Print the given summary info
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virtual void print_summary_info(G1RemSetSummary * summary, const char * header = NULL);
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public:
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// This is called to reset dual hash tables after the gc pause
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// is finished and the initial hash table is no longer being
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// scanned.
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void cleanupHRRS();
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G1RemSet(G1CollectedHeap* g1, CardTableModRefBS* ct_bs);
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~G1RemSet();
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// Invoke "blk->do_oop" on all pointers into the collection set
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// from objects in regions outside the collection set (having
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// invoked "blk->set_region" to set the "from" region correctly
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// beforehand.)
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//
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// Invoke code_root_cl->do_code_blob on the unmarked nmethods
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// on the strong code roots list for each region in the
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// collection set.
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//
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// The "worker_i" param is for the parallel case where the id
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// of the worker thread calling this function can be helpful in
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// partitioning the work to be done. It should be the same as
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// the "i" passed to the calling thread's work(i) function.
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// In the sequential case this param will be ignored.
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void oops_into_collection_set_do(G1ParPushHeapRSClosure* blk,
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CodeBlobClosure* code_root_cl,
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uint worker_i);
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// Prepare for and cleanup after an oops_into_collection_set_do
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// call. Must call each of these once before and after (in sequential
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// code) any threads call oops_into_collection_set_do. (This offers an
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// opportunity to sequential setup and teardown of structures needed by a
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// parallel iteration over the CS's RS.)
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void prepare_for_oops_into_collection_set_do();
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void cleanup_after_oops_into_collection_set_do();
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void scanRS(G1ParPushHeapRSClosure* oc,
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CodeBlobClosure* code_root_cl,
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uint worker_i);
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void updateRS(DirtyCardQueue* into_cset_dcq, uint worker_i);
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CardTableModRefBS* ct_bs() { return _ct_bs; }
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size_t cardsScanned() { return _total_cards_scanned; }
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// Record, if necessary, the fact that *p (where "p" is in region "from",
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// which is required to be non-NULL) has changed to a new non-NULL value.
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template <class T> void write_ref(HeapRegion* from, T* p);
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template <class T> void par_write_ref(HeapRegion* from, T* p, uint tid);
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// Requires "region_bm" and "card_bm" to be bitmaps with 1 bit per region
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// or card, respectively, such that a region or card with a corresponding
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// 0 bit contains no part of any live object. Eliminates any remembered
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// set entries that correspond to dead heap ranges. "worker_num" is the
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// parallel thread id of the current thread, and "hrclaimer" is the
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// HeapRegionClaimer that should be used.
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void scrub(BitMap* region_bm, BitMap* card_bm, uint worker_num, HeapRegionClaimer* hrclaimer);
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// Refine the card corresponding to "card_ptr".
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// If check_for_refs_into_cset is true, a true result is returned
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// if the given card contains oops that have references into the
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// current collection set.
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virtual bool refine_card(jbyte* card_ptr,
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uint worker_i,
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bool check_for_refs_into_cset);
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// Print accumulated summary info from the start of the VM.
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virtual void print_summary_info();
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// Print accumulated summary info from the last time called.
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virtual void print_periodic_summary_info(const char* header);
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// Prepare remembered set for verification.
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virtual void prepare_for_verify();
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size_t conc_refine_cards() const {
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return _conc_refine_cards;
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}
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};
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class UpdateRSOopClosure: public ExtendedOopClosure {
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HeapRegion* _from;
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G1RemSet* _rs;
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uint _worker_i;
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template <class T> void do_oop_work(T* p);
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public:
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UpdateRSOopClosure(G1RemSet* rs, uint worker_i = 0) :
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_from(NULL), _rs(rs), _worker_i(worker_i)
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{}
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void set_from(HeapRegion* from) {
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assert(from != NULL, "from region must be non-NULL");
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_from = from;
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}
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virtual void do_oop(narrowOop* p) { do_oop_work(p); }
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virtual void do_oop(oop* p) { do_oop_work(p); }
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// Override: this closure is idempotent.
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// bool idempotent() { return true; }
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bool apply_to_weak_ref_discovered_field() { return true; }
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};
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#endif // SHARE_VM_GC_G1_G1REMSET_HPP
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