g1RemSet.cpp revision 3863
7c8051ef91610c696bc9fa2e61ad1b153fbe7ce0Klaus Luettich * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved.
7c8051ef91610c696bc9fa2e61ad1b153fbe7ce0Klaus Luettich * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
956dc203c5fce297dd8ba3ba77703df3d87c8597Christian Maeder * This code is free software; you can redistribute it and/or modify it
98890889ffb2e8f6f722b00e265a211f13b5a861Corneliu-Claudiu Prodescu * under the terms of the GNU General Public License version 2 only, as
7c8051ef91610c696bc9fa2e61ad1b153fbe7ce0Klaus Luettich * published by the Free Software Foundation.
7c8051ef91610c696bc9fa2e61ad1b153fbe7ce0Klaus Luettich * This code is distributed in the hope that it will be useful, but WITHOUT
7c8051ef91610c696bc9fa2e61ad1b153fbe7ce0Klaus Luettich * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
7c8051ef91610c696bc9fa2e61ad1b153fbe7ce0Klaus Luettich * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
99634745e86bb1c79da4e2b376e580f65ee67082Klaus Luettich * version 2 for more details (a copy is included in the LICENSE file that
7c8051ef91610c696bc9fa2e61ad1b153fbe7ce0Klaus Luettich * accompanied this code).
7c8051ef91610c696bc9fa2e61ad1b153fbe7ce0Klaus Luettich * You should have received a copy of the GNU General Public License version
7c8051ef91610c696bc9fa2e61ad1b153fbe7ce0Klaus Luettich * 2 along with this work; if not, write to the Free Software Foundation,
7c8051ef91610c696bc9fa2e61ad1b153fbe7ce0Klaus Luettich * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
8a6eb5a17ea17b650b29099036549b66eec4884aChristian Maeder * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
abee46762c1663b85c6f18d934cd11df83828f6eChristian Maeder * or visit www.oracle.com if you need additional information or have any
80c2d23821d095b55d9a547f48fc3fcdc27df405Christian Maeder#include "gc_implementation/g1/bufferingOopClosure.hpp"
5607bbe40d1b360797381a83a6eae6773ee7cd2cChristian Maeder#include "gc_implementation/g1/concurrentG1Refine.hpp"
5607bbe40d1b360797381a83a6eae6773ee7cd2cChristian Maeder#include "gc_implementation/g1/concurrentG1RefineThread.hpp"
7c8051ef91610c696bc9fa2e61ad1b153fbe7ce0Klaus Luettich#include "gc_implementation/g1/g1BlockOffsetTable.inline.hpp"
5607bbe40d1b360797381a83a6eae6773ee7cd2cChristian Maeder#include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
5607bbe40d1b360797381a83a6eae6773ee7cd2cChristian Maeder#include "gc_implementation/g1/g1CollectorPolicy.hpp"
5275f013db52ff487795b71ee4dcc9268f62e574Christian Maeder#include "gc_implementation/g1/g1OopClosures.inline.hpp"
5607bbe40d1b360797381a83a6eae6773ee7cd2cChristian Maeder#include "gc_implementation/g1/g1RemSet.inline.hpp"
7c8051ef91610c696bc9fa2e61ad1b153fbe7ce0Klaus Luettich#include "gc_implementation/g1/heapRegionSeq.inline.hpp"
7c8051ef91610c696bc9fa2e61ad1b153fbe7ce0Klaus Luettichvoid init_ct_freq_table(size_t heap_sz_bytes) {
7c8051ef91610c696bc9fa2e61ad1b153fbe7ce0Klaus Luettich ct_freq_sz = heap_sz_bytes/CardTableModRefBS::card_size;
7c8051ef91610c696bc9fa2e61ad1b153fbe7ce0Klaus Luettich for (size_t j = 0; j < ct_freq_sz; j++) ct_freq[j] = 0;
7c8051ef91610c696bc9fa2e61ad1b153fbe7ce0Klaus Luettich assert(0 <= index && index < ct_freq_sz, "Bounds error.");
734a5ebd38032798f0ab908e2d52862c71b2c127Simon Ulbricht if (ct_freq[index] < 100) { ct_freq[index]++; }
697e63e30aa3c309a1ef1f9357745111f8dfc5a9Christian Maederstatic IntHistogram card_repeat_count(10, 10);
1842453990fed8a1bd7a5ac792d7982c1d2bfcd5Christian MaederG1RemSet::G1RemSet(G1CollectedHeap* g1, CardTableModRefBS* ct_bs)
46f27ca50ca6aa59e3c703b02ba0959e7b46ed34Christian Maeder _cards_scanned(NULL), _total_cards_scanned(0)
46f27ca50ca6aa59e3c703b02ba0959e7b46ed34Christian Maeder guarantee(n_workers() > 0, "There should be some workers");
46f27ca50ca6aa59e3c703b02ba0959e7b46ed34Christian Maeder _cset_rs_update_cl = NEW_C_HEAP_ARRAY(OopsInHeapRegionClosure*, n_workers(), mtGC);
8a6eb5a17ea17b650b29099036549b66eec4884aChristian Maeder assert(_cset_rs_update_cl[i] == NULL, "it should be");
46f27ca50ca6aa59e3c703b02ba0959e7b46ed34Christian Maeder FREE_C_HEAP_ARRAY(OopsInHeapRegionClosure*, _cset_rs_update_cl, mtGC);
46f27ca50ca6aa59e3c703b02ba0959e7b46ed34Christian Maedervoid CountNonCleanMemRegionClosure::do_MemRegion(MemRegion mr) {
46f27ca50ca6aa59e3c703b02ba0959e7b46ed34Christian Maeder _n += (int) ((mr.byte_size() / CardTableModRefBS::card_size));
46f27ca50ca6aa59e3c703b02ba0959e7b46ed34Christian Maeder if (_start_first == NULL) _start_first = mr.start();
46f27ca50ca6aa59e3c703b02ba0959e7b46ed34Christian Maederclass ScanRSClosure : public HeapRegionClosure {
abee46762c1663b85c6f18d934cd11df83828f6eChristian Maeder ScanRSClosure(OopsInHeapRegionClosure* oc, int worker_i) :
46f27ca50ca6aa59e3c703b02ba0959e7b46ed34Christian Maeder _ct_bs = (CardTableModRefBS*) (_g1h->barrier_set());
46f27ca50ca6aa59e3c703b02ba0959e7b46ed34Christian Maeder _block_size = MAX2<int>(G1RSetScanBlockSize, 1);
46f27ca50ca6aa59e3c703b02ba0959e7b46ed34Christian Maeder void set_try_claimed() { _try_claimed = true; }
8a6eb5a17ea17b650b29099036549b66eec4884aChristian Maeder void scanCard(size_t index, HeapRegion *r) {
7c8051ef91610c696bc9fa2e61ad1b153fbe7ce0Klaus Luettich // Stack allocate the DirtyCardToOopClosure instance
7c8051ef91610c696bc9fa2e61ad1b153fbe7ce0Klaus Luettich // Set the "from" region in the closure.
5607bbe40d1b360797381a83a6eae6773ee7cd2cChristian Maeder HeapWord* card_start = _bot_shared->address_for_index(index);
7c8051ef91610c696bc9fa2e61ad1b153fbe7ce0Klaus Luettich HeapWord* card_end = card_start + G1BlockOffsetSharedArray::N_words;
5607bbe40d1b360797381a83a6eae6773ee7cd2cChristian Maeder Space *sp = SharedHeap::heap()->space_containing(card_start);
5607bbe40d1b360797381a83a6eae6773ee7cd2cChristian Maeder MemRegion sm_region = sp->used_region_at_save_marks();
da955132262baab309a50fdffe228c9efe68251dCui Jian MemRegion mr = sm_region.intersection(MemRegion(card_start,card_end));
7c8051ef91610c696bc9fa2e61ad1b153fbe7ce0Klaus Luettich if (!mr.is_empty() && !_ct_bs->is_card_claimed(index)) {
7c8051ef91610c696bc9fa2e61ad1b153fbe7ce0Klaus Luettich // We make the card as "claimed" lazily (so races are possible
7c8051ef91610c696bc9fa2e61ad1b153fbe7ce0Klaus Luettich // but they're benign), which reduces the number of duplicate
7c8051ef91610c696bc9fa2e61ad1b153fbe7ce0Klaus Luettich // scans (the rsets of the regions in the cset can intersect).
7c8051ef91610c696bc9fa2e61ad1b153fbe7ce0Klaus Luettich void printCard(HeapRegion* card_region, size_t card_index,
7c8051ef91610c696bc9fa2e61ad1b153fbe7ce0Klaus Luettich gclog_or_tty->print_cr("T %d Region [" PTR_FORMAT ", " PTR_FORMAT ") "
7c8051ef91610c696bc9fa2e61ad1b153fbe7ce0Klaus Luettich "RS names card %p: "
7c8051ef91610c696bc9fa2e61ad1b153fbe7ce0Klaus Luettich card_start, card_start + G1BlockOffsetSharedArray::N_words);
5607bbe40d1b360797381a83a6eae6773ee7cd2cChristian Maeder assert(r->in_collection_set(), "should only be called on elements of CS.");
7c8051ef91610c696bc9fa2e61ad1b153fbe7ce0Klaus Luettich if (hrrs->iter_is_complete()) return false; // All done.
7c8051ef91610c696bc9fa2e61ad1b153fbe7ce0Klaus Luettich if (!_try_claimed && !hrrs->claim_iter()) return false;
5afb6772d49d8f8a4ccf8c90781322e5603be076Razvan Pascanu // If we ever free the collection set concurrently, we should also
5afb6772d49d8f8a4ccf8c90781322e5603be076Razvan Pascanu // clear the card table concurrently therefore we won't need to
46f27ca50ca6aa59e3c703b02ba0959e7b46ed34Christian Maeder // add regions of the collection set to the dirty cards region.
5607bbe40d1b360797381a83a6eae6773ee7cd2cChristian Maeder // If we didn't return above, then
5607bbe40d1b360797381a83a6eae6773ee7cd2cChristian Maeder // _try_claimed || r->claim_iter()
5607bbe40d1b360797381a83a6eae6773ee7cd2cChristian Maeder // is true: either we're supposed to work on claimed-but-not-complete
5275f013db52ff487795b71ee4dcc9268f62e574Christian Maeder // regions, or we successfully claimed the region.
c1d06b3018b34ede2b3fb6c7fe2ad28cd5ce5b68Christian Maeder HeapRegionRemSetIterator* iter = _g1h->rem_set_iterator(_worker_i);
5607bbe40d1b360797381a83a6eae6773ee7cd2cChristian Maeder // We claim cards in block so as to recude the contention. The block size is determined by
608905466a681675bd518c1f8959b21e525404c7Christian Maeder // the G1RSetScanBlockSize parameter.
608905466a681675bd518c1f8959b21e525404c7Christian Maeder size_t jump_to_card = hrrs->iter_claimed_next(_block_size);
5607bbe40d1b360797381a83a6eae6773ee7cd2cChristian Maeder for (size_t current_card = 0; iter->has_next(card_index); current_card++) {
5607bbe40d1b360797381a83a6eae6773ee7cd2cChristian Maeder if (current_card >= jump_to_card + _block_size) {
5275f013db52ff487795b71ee4dcc9268f62e574Christian Maeder jump_to_card = hrrs->iter_claimed_next(_block_size);
5275f013db52ff487795b71ee4dcc9268f62e574Christian Maeder HeapWord* card_start = _g1h->bot_shared()->address_for_index(card_index);
5607bbe40d1b360797381a83a6eae6773ee7cd2cChristian Maeder gclog_or_tty->print("Rem set iteration yielded card [" PTR_FORMAT ", " PTR_FORMAT ").\n",
5607bbe40d1b360797381a83a6eae6773ee7cd2cChristian Maeder card_start, card_start + CardTableModRefBS::card_size_in_words);
7c8051ef91610c696bc9fa2e61ad1b153fbe7ce0Klaus Luettich HeapRegion* card_region = _g1h->heap_region_containing(card_start);
7c8051ef91610c696bc9fa2e61ad1b153fbe7ce0Klaus Luettich assert(card_region != NULL, "Yielding cards not in the heap?");
46f27ca50ca6aa59e3c703b02ba0959e7b46ed34Christian Maeder if (!card_region->is_on_dirty_cards_region_list()) {
46f27ca50ca6aa59e3c703b02ba0959e7b46ed34Christian Maeder _g1h->push_dirty_cards_region(card_region);
5607bbe40d1b360797381a83a6eae6773ee7cd2cChristian Maeder // If the card is dirty, then we will scan it during updateRS.
5607bbe40d1b360797381a83a6eae6773ee7cd2cChristian Maeder return false;
46f27ca50ca6aa59e3c703b02ba0959e7b46ed34Christian Maedervoid G1RemSet::scanRS(OopsInHeapRegionClosure* oc, int worker_i) {
46f27ca50ca6aa59e3c703b02ba0959e7b46ed34Christian Maeder HeapRegion *startRegion = _g1->start_cset_region_for_worker(worker_i);
5607bbe40d1b360797381a83a6eae6773ee7cd2cChristian Maeder _g1->collection_set_iterate_from(startRegion, &scanRScl);
c1d06b3018b34ede2b3fb6c7fe2ad28cd5ce5b68Christian Maeder _g1->collection_set_iterate_from(startRegion, &scanRScl);
5607bbe40d1b360797381a83a6eae6773ee7cd2cChristian Maeder double scan_rs_time_sec = os::elapsedTime() - rs_time_start;
50a881b56a41120f05ad6100dd2a8f1dc3fb81faRazvan Pascanu assert( _cards_scanned != NULL, "invariant" );
b5eebfe4b3f040df3ca96fa18208e04e2d026b0cChristian Maeder _cards_scanned[worker_i] = scanRScl.cards_done();
46f27ca50ca6aa59e3c703b02ba0959e7b46ed34Christian Maeder _g1p->record_scan_rs_time(worker_i, scan_rs_time_sec * 1000.0);
46f27ca50ca6aa59e3c703b02ba0959e7b46ed34Christian Maeder// Closure used for updating RSets and recording references that
46f27ca50ca6aa59e3c703b02ba0959e7b46ed34Christian Maeder// point into the collection set. Only called during an
46f27ca50ca6aa59e3c703b02ba0959e7b46ed34Christian Maeder// evacuation pause.
24b1bb673d802899fed9a32b7044dab9aa6ec121Christian Maederclass RefineRecordRefsIntoCSCardTableEntryClosure: public CardTableEntryClosure {
46f27ca50ca6aa59e3c703b02ba0959e7b46ed34Christian Maeder RefineRecordRefsIntoCSCardTableEntryClosure(G1CollectedHeap* g1h,
46f27ca50ca6aa59e3c703b02ba0959e7b46ed34Christian Maeder _g1rs(g1h->g1_rem_set()), _into_cset_dcq(into_cset_dcq)
46f27ca50ca6aa59e3c703b02ba0959e7b46ed34Christian Maeder bool do_card_ptr(jbyte* card_ptr, int worker_i) {
46f27ca50ca6aa59e3c703b02ba0959e7b46ed34Christian Maeder // The only time we care about recording cards that
3381577723c93f6809779979315934ef9430187fChristian Maeder // contain references that point into the collection set
3381577723c93f6809779979315934ef9430187fChristian Maeder // is during RSet updating within an evacuation pause.
3381577723c93f6809779979315934ef9430187fChristian Maeder // In this case worker_i should be the id of a GC worker thread.
3381577723c93f6809779979315934ef9430187fChristian Maeder assert(SafepointSynchronize::is_at_safepoint(), "not during an evacuation pause");
3381577723c93f6809779979315934ef9430187fChristian Maeder assert(worker_i < (int) (ParallelGCThreads == 0 ? 1 : ParallelGCThreads), "should be a GC worker");
3381577723c93f6809779979315934ef9430187fChristian Maeder if (_g1rs->concurrentRefineOneCard(card_ptr, worker_i, true)) {
5607bbe40d1b360797381a83a6eae6773ee7cd2cChristian Maeder // 'card_ptr' contains references that point into the collection
46f27ca50ca6aa59e3c703b02ba0959e7b46ed34Christian Maeder // set. We need to record the card in the DCQS
46f27ca50ca6aa59e3c703b02ba0959e7b46ed34Christian Maeder // (G1CollectedHeap::into_cset_dirty_card_queue_set())
3381577723c93f6809779979315934ef9430187fChristian Maeder // that's used for that purpose.
3381577723c93f6809779979315934ef9430187fChristian Maeder // Enqueue the card
46f27ca50ca6aa59e3c703b02ba0959e7b46ed34Christian Maedervoid G1RemSet::updateRS(DirtyCardQueue* into_cset_dcq, int worker_i) {
3381577723c93f6809779979315934ef9430187fChristian Maeder // Apply the given closure to all remaining log entries.
3381577723c93f6809779979315934ef9430187fChristian Maeder RefineRecordRefsIntoCSCardTableEntryClosure into_cset_update_rs_cl(_g1, into_cset_dcq);
3381577723c93f6809779979315934ef9430187fChristian Maeder _g1->iterate_dirty_card_closure(&into_cset_update_rs_cl, into_cset_dcq, false, worker_i);
3381577723c93f6809779979315934ef9430187fChristian Maeder // Now there should be no dirty cards.
3381577723c93f6809779979315934ef9430187fChristian Maeder // XXX This isn't true any more: keeping cards of young regions
46f27ca50ca6aa59e3c703b02ba0959e7b46ed34Christian Maeder // marked dirty broke it. Need some reasonable fix.
46f27ca50ca6aa59e3c703b02ba0959e7b46ed34Christian Maeder guarantee(cl.n() == 0, "Card table should be clean.");
46f27ca50ca6aa59e3c703b02ba0959e7b46ed34Christian Maeder _g1p->record_update_rs_time(worker_i, (os::elapsedTime() - start) * 1000.0);
46f27ca50ca6aa59e3c703b02ba0959e7b46ed34Christian Maederclass CountRSSizeClosure: public HeapRegionClosure {
5607bbe40d1b360797381a83a6eae6773ee7cd2cChristian Maeder CountRSSizeClosure() : _n(0), _tot(0), _max(0), _max_r(NULL) {
5275f013db52ff487795b71ee4dcc9268f62e574Christian Maeder for (int i = 0; i < N; i++) _histo[i] = 0;
7c8051ef91610c696bc9fa2e61ad1b153fbe7ce0Klaus Luettich // Fit it into a histo bin.
5607bbe40d1b360797381a83a6eae6773ee7cd2cChristian Maeder return false;
50a881b56a41120f05ad6100dd2a8f1dc3fb81faRazvan Pascanu while (mx >= 0) {
5607bbe40d1b360797381a83a6eae6773ee7cd2cChristian Maeder gclog_or_tty->print_cr("Number of regions with given RS sizes:");
50a881b56a41120f05ad6100dd2a8f1dc3fb81faRazvan Pascanu gclog_or_tty->print_cr(" <= %8d %8d", 1 << MIN, _histo[0]);
b5eebfe4b3f040df3ca96fa18208e04e2d026b0cChristian Maeder gclog_or_tty->print_cr(" > %8d %8d", (1 << (MIN+mx-2))+1, _histo[mx-1]);
50a881b56a41120f05ad6100dd2a8f1dc3fb81faRazvan Pascanuvoid G1RemSet::oops_into_collection_set_do(OopsInHeapRegionClosure* oc,
80c2d23821d095b55d9a547f48fc3fcdc27df405Christian Maeder // Make this into a command-line flag...
80c2d23821d095b55d9a547f48fc3fcdc27df405Christian Maeder if (G1RSCountHisto && (ParallelGCThreads == 0 || worker_i == 0)) {
956dc203c5fce297dd8ba3ba77703df3d87c8597Christian Maeder gclog_or_tty->print_cr("Avg of %d RS counts is %f, max is %d, "
956dc203c5fce297dd8ba3ba77703df3d87c8597Christian Maeder count_cl.n(), (float)count_cl.tot()/(float)count_cl.n(),
52e3fbd71a34c294b93a44c02829991e044d163bChristian Maeder // We cache the value of 'oc' closure into the appropriate slot in the
46f27ca50ca6aa59e3c703b02ba0959e7b46ed34Christian Maeder // _cset_rs_update_cl for this worker
52e3fbd71a34c294b93a44c02829991e044d163bChristian Maeder assert(worker_i < (int)n_workers(), "sanity");
46f27ca50ca6aa59e3c703b02ba0959e7b46ed34Christian Maeder // A DirtyCardQueue that is used to hold cards containing references
46f27ca50ca6aa59e3c703b02ba0959e7b46ed34Christian Maeder // that point into the collection set. This DCQ is associated with a
46f27ca50ca6aa59e3c703b02ba0959e7b46ed34Christian Maeder // special DirtyCardQueueSet (see g1CollectedHeap.hpp). Under normal
46f27ca50ca6aa59e3c703b02ba0959e7b46ed34Christian Maeder // circumstances (i.e. the pause successfully completes), these cards
46f27ca50ca6aa59e3c703b02ba0959e7b46ed34Christian Maeder // are just discarded (there's no need to update the RSets of regions
80c2d23821d095b55d9a547f48fc3fcdc27df405Christian Maeder // that were in the collection set - after the pause these regions
52e3fbd71a34c294b93a44c02829991e044d163bChristian Maeder // are wholly 'free' of live objects. In the event of an evacuation
80c2d23821d095b55d9a547f48fc3fcdc27df405Christian Maeder // failure the cards/buffers in this queue set are:
80c2d23821d095b55d9a547f48fc3fcdc27df405Christian Maeder // * passed to the DirtyCardQueueSet that is used to manage deferred
80c2d23821d095b55d9a547f48fc3fcdc27df405Christian Maeder // RSet updates, or
46f27ca50ca6aa59e3c703b02ba0959e7b46ed34Christian Maeder // * scanned for references that point into the collection set
46f27ca50ca6aa59e3c703b02ba0959e7b46ed34Christian Maeder // and the RSet of the corresponding region in the collection set
0e426c4d12afafe40a20b33ac4e7f3504296d945Jonathan von Schroeder // is updated immediately.
0e426c4d12afafe40a20b33ac4e7f3504296d945Jonathan von Schroeder DirtyCardQueue into_cset_dcq(&_g1->into_cset_dirty_card_queue_set());
0e426c4d12afafe40a20b33ac4e7f3504296d945Jonathan von Schroeder assert((ParallelGCThreads > 0) || worker_i == 0, "invariant");
0e426c4d12afafe40a20b33ac4e7f3504296d945Jonathan von Schroeder // The two flags below were introduced temporarily to serialize
0e426c4d12afafe40a20b33ac4e7f3504296d945Jonathan von Schroeder // the updating and scanning of remembered sets. There are some
0e426c4d12afafe40a20b33ac4e7f3504296d945Jonathan von Schroeder // race conditions when these two operations are done in parallel
0e426c4d12afafe40a20b33ac4e7f3504296d945Jonathan von Schroeder // and they are causing failures. When we resolve said race
0e426c4d12afafe40a20b33ac4e7f3504296d945Jonathan von Schroeder // conditions, we'll revert back to parallel remembered set
0e426c4d12afafe40a20b33ac4e7f3504296d945Jonathan von Schroeder // updating and scanning. See CRs 6677707 and 6677708.
0e426c4d12afafe40a20b33ac4e7f3504296d945Jonathan von Schroeder if (G1UseParallelRSetUpdating || (worker_i == 0)) {
0e426c4d12afafe40a20b33ac4e7f3504296d945Jonathan von Schroeder _g1p->record_update_rs_processed_buffers(worker_i, 0.0);
cc0f4ccc7b7b78615f1ad5219025c2d2b7158720Jonathan von Schroeder _g1p->record_update_rs_time(worker_i, 0.0);
52e3fbd71a34c294b93a44c02829991e044d163bChristian Maeder if (G1UseParallelRSetScanning || (worker_i == 0)) {
0e426c4d12afafe40a20b33ac4e7f3504296d945Jonathan von Schroeder _g1p->record_scan_rs_time(worker_i, 0.0);
0e426c4d12afafe40a20b33ac4e7f3504296d945Jonathan von Schroeder // We now clear the cached values of _cset_rs_update_cl for this worker
6a3606ae183002ec26bf44fc61388c31bfc648e0Christian Maedervoid G1RemSet::prepare_for_oops_into_collection_set_do() {
6a3606ae183002ec26bf44fc61388c31bfc648e0Christian Maeder ConcurrentG1Refine* cg1r = _g1->concurrent_g1_refine();
0e426c4d12afafe40a20b33ac4e7f3504296d945Jonathan von Schroeder _g1->set_refine_cte_cl_concurrency(false);
0e426c4d12afafe40a20b33ac4e7f3504296d945Jonathan von Schroeder DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set();
4e9e2e2f42fc528b8f091f804fa9b2b680b9b792Jonathan von Schroeder if (G1CollectedHeap::use_parallel_gc_threads()) {
4e9e2e2f42fc528b8f091f804fa9b2b680b9b792Jonathan von Schroeder // Don't set the number of workers here. It will be set
4e9e2e2f42fc528b8f091f804fa9b2b680b9b792Jonathan von Schroeder // when the task is run
0e426c4d12afafe40a20b33ac4e7f3504296d945Jonathan von Schroeder // _seq_task->set_n_termination((int)n_workers());
0e426c4d12afafe40a20b33ac4e7f3504296d945Jonathan von Schroeder guarantee( _cards_scanned == NULL, "invariant" );
52e3fbd71a34c294b93a44c02829991e044d163bChristian Maeder _cards_scanned = NEW_C_HEAP_ARRAY(size_t, n_workers(), mtGC);
5607bbe40d1b360797381a83a6eae6773ee7cd2cChristian Maeder// This closure, applied to a DirtyCardQueueSet, is used to immediately
5607bbe40d1b360797381a83a6eae6773ee7cd2cChristian Maeder// update the RSets for the regions in the CSet. For each card it iterates
5275f013db52ff487795b71ee4dcc9268f62e574Christian Maeder// through the oops which coincide with that card. It scans the reference
7c8051ef91610c696bc9fa2e61ad1b153fbe7ce0Klaus Luettich// fields in each oop; when it finds an oop that points into the collection
7c8051ef91610c696bc9fa2e61ad1b153fbe7ce0Klaus Luettich// set, the RSet for the region containing the referenced object is updated.
46f27ca50ca6aa59e3c703b02ba0959e7b46ed34Christian Maederclass UpdateRSetCardTableEntryIntoCSetClosure: public CardTableEntryClosure {
5607bbe40d1b360797381a83a6eae6773ee7cd2cChristian Maeder UpdateRSetCardTableEntryIntoCSetClosure(G1CollectedHeap* g1,
5607bbe40d1b360797381a83a6eae6773ee7cd2cChristian Maeder bool do_card_ptr(jbyte* card_ptr, int worker_i) {
c1d06b3018b34ede2b3fb6c7fe2ad28cd5ce5b68Christian Maeder // Construct the region representing the card.
5607bbe40d1b360797381a83a6eae6773ee7cd2cChristian Maeder HeapWord* start = _ct_bs->addr_for(card_ptr);
076f0bae1471e0122ae67c197bcac3e6799c0a31Christian Maeder // And find the region containing it.
076f0bae1471e0122ae67c197bcac3e6799c0a31Christian Maeder HeapRegion* r = _g1->heap_region_containing(start);
076f0bae1471e0122ae67c197bcac3e6799c0a31Christian Maeder // Scan oops in the card looking for references into the collection set
65c8e8b1cf766534fa0c9aec33e538dc3894ea13Christian Maeder HeapWord* end = _ct_bs->addr_for(card_ptr + 1);
076f0bae1471e0122ae67c197bcac3e6799c0a31Christian Maeder UpdateRSetImmediate update_rs_cl(_g1->g1_rem_set());
076f0bae1471e0122ae67c197bcac3e6799c0a31Christian Maeder FilterIntoCSClosure update_rs_cset_oop_cl(NULL, _g1, &update_rs_cl);
076f0bae1471e0122ae67c197bcac3e6799c0a31Christian Maeder FilterOutOfRegionClosure filter_then_update_rs_cset_oop_cl(r, &update_rs_cset_oop_cl);
734a5ebd38032798f0ab908e2d52862c71b2c127Simon Ulbricht // We can pass false as the "filter_young" parameter here as:
65c8e8b1cf766534fa0c9aec33e538dc3894ea13Christian Maeder // * we should be in a STW pause,
076f0bae1471e0122ae67c197bcac3e6799c0a31Christian Maeder // * the DCQS to which this closure is applied is used to hold
076f0bae1471e0122ae67c197bcac3e6799c0a31Christian Maeder // references that point into the collection set from the prior
5607bbe40d1b360797381a83a6eae6773ee7cd2cChristian Maeder // RSet updating,
65c8e8b1cf766534fa0c9aec33e538dc3894ea13Christian Maeder // * the post-write barrier shouldn't be logging updates to young
65c8e8b1cf766534fa0c9aec33e538dc3894ea13Christian Maeder // regions (but there is a situation where this can happen - see
65c8e8b1cf766534fa0c9aec33e538dc3894ea13Christian Maeder // the comment in G1RemSet::concurrentRefineOneCard below -
076f0bae1471e0122ae67c197bcac3e6799c0a31Christian Maeder // that should not be applicable here), and
734a5ebd38032798f0ab908e2d52862c71b2c127Simon Ulbricht // * during actual RSet updating, the filtering of cards in young
734a5ebd38032798f0ab908e2d52862c71b2c127Simon Ulbricht // regions in HeapRegion::oops_on_card_seq_iterate_careful is
076f0bae1471e0122ae67c197bcac3e6799c0a31Christian Maeder // As a result, when this closure is applied to "refs into cset"
734a5ebd38032798f0ab908e2d52862c71b2c127Simon Ulbricht // DCQS, we shouldn't see any cards in young regions.
734a5ebd38032798f0ab908e2d52862c71b2c127Simon Ulbricht r->oops_on_card_seq_iterate_careful(scanRegion,
734a5ebd38032798f0ab908e2d52862c71b2c127Simon Ulbricht false /* filter_young */,
734a5ebd38032798f0ab908e2d52862c71b2c127Simon Ulbricht // Since this is performed in the event of an evacuation failure, we
734a5ebd38032798f0ab908e2d52862c71b2c127Simon Ulbricht // we shouldn't see a non-null stop point
734a5ebd38032798f0ab908e2d52862c71b2c127Simon Ulbricht assert(stop_point == NULL, "saw an unallocated region");
_total_cards_scanned = 0;
if (G1DeferredRSUpdate) {
int n_completed_buffers = 0;
if (!r->continuesHumongous()) {
n_workers(),
_triggered(false) { }
bool record_refs_into_cset,
int worker_i) :
bool check_for_refs_into_cset) {
if (check_for_refs_into_cset) {
worker_i);
bool filter_young = true;
card_ptr);
bool check_for_refs_into_cset) {
if (r == NULL) {
if (r->is_young()) {
if (r->in_collection_set()) {
bool defer = false;
bool oops_into_cset = false;
if (r == NULL) {
if (!defer) {
return oops_into_cset;
HRRSStatsIter() :
_occupied(0),
_total_mem_sz(0),
_max_mem_sz(0),
if (r->continuesHumongous()) return false;
_max_mem_sz_region = r;
(float)tot_processed_buffers);
(float)tot_processed_buffers);
cleanupHRRS();