1 /*
2 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
392 workers->active_workers());
393 workers->run_task(&cl);
394 }
395
396 class G1ClearCardLiveDataTask : public AbstractGangTask {
397 BitMapView _bitmap;
398 size_t _num_chunks;
399 size_t _cur_chunk;
400 public:
401 G1ClearCardLiveDataTask(const BitMapView& bitmap, size_t num_tasks) :
402 AbstractGangTask("G1 Clear Card Live Data"),
403 _bitmap(bitmap),
404 _num_chunks(num_tasks),
405 _cur_chunk(0) {
406 }
407
408 static size_t chunk_size() { return M; }
409
410 virtual void work(uint worker_id) {
411 while (true) {
412 size_t to_process = Atomic::add(1, &_cur_chunk) - 1;
413 if (to_process >= _num_chunks) {
414 break;
415 }
416
417 BitMap::idx_t start = M * BitsPerByte * to_process;
418 BitMap::idx_t end = MIN2(start + M * BitsPerByte, _bitmap.size());
419 _bitmap.clear_range(start, end);
420 }
421 }
422 };
423
424 void G1CardLiveData::clear(WorkGang* workers) {
425 guarantee(Universe::is_fully_initialized(), "Should not call this during initialization.");
426
427 size_t const num_chunks = align_up(live_cards_bm().size_in_bytes(), G1ClearCardLiveDataTask::chunk_size()) / G1ClearCardLiveDataTask::chunk_size();
428 uint const num_workers = (uint)MIN2(num_chunks, (size_t)workers->active_workers());
429
430 G1ClearCardLiveDataTask cl(live_cards_bm(), num_chunks);
431
432 log_debug(gc, ergo)("Running %s using %u workers for " SIZE_FORMAT " work units.", cl.name(), num_workers, num_chunks);
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1 /*
2 * Copyright (c) 2016, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
392 workers->active_workers());
393 workers->run_task(&cl);
394 }
395
396 class G1ClearCardLiveDataTask : public AbstractGangTask {
397 BitMapView _bitmap;
398 size_t _num_chunks;
399 size_t _cur_chunk;
400 public:
401 G1ClearCardLiveDataTask(const BitMapView& bitmap, size_t num_tasks) :
402 AbstractGangTask("G1 Clear Card Live Data"),
403 _bitmap(bitmap),
404 _num_chunks(num_tasks),
405 _cur_chunk(0) {
406 }
407
408 static size_t chunk_size() { return M; }
409
410 virtual void work(uint worker_id) {
411 while (true) {
412 size_t to_process = Atomic::add(1u, &_cur_chunk) - 1;
413 if (to_process >= _num_chunks) {
414 break;
415 }
416
417 BitMap::idx_t start = M * BitsPerByte * to_process;
418 BitMap::idx_t end = MIN2(start + M * BitsPerByte, _bitmap.size());
419 _bitmap.clear_range(start, end);
420 }
421 }
422 };
423
424 void G1CardLiveData::clear(WorkGang* workers) {
425 guarantee(Universe::is_fully_initialized(), "Should not call this during initialization.");
426
427 size_t const num_chunks = align_up(live_cards_bm().size_in_bytes(), G1ClearCardLiveDataTask::chunk_size()) / G1ClearCardLiveDataTask::chunk_size();
428 uint const num_workers = (uint)MIN2(num_chunks, (size_t)workers->active_workers());
429
430 G1ClearCardLiveDataTask cl(live_cards_bm(), num_chunks);
431
432 log_debug(gc, ergo)("Running %s using %u workers for " SIZE_FORMAT " work units.", cl.name(), num_workers, num_chunks);
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