mirror of
https://github.com/openjdk/jdk.git
synced 2026-05-09 21:19:38 +00:00
114 lines
4.4 KiB
C++
114 lines
4.4 KiB
C++
/*
|
|
* Copyright (c) 2023, 2025, 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.
|
|
*
|
|
*/
|
|
|
|
#include "gc/g1/g1FullCollector.inline.hpp"
|
|
#include "gc/g1/g1FullGCResetMetadataTask.hpp"
|
|
#include "utilities/ticks.hpp"
|
|
|
|
G1FullGCResetMetadataTask::G1ResetMetadataClosure::G1ResetMetadataClosure(G1FullCollector* collector) :
|
|
_g1h(G1CollectedHeap::heap()),
|
|
_collector(collector) { }
|
|
|
|
void G1FullGCResetMetadataTask::G1ResetMetadataClosure::reset_region_metadata(G1HeapRegion* hr) {
|
|
assert(hr->is_humongous() || !hr->rem_set()->has_cset_group(),
|
|
"Non-humongous regions must not have cset group");
|
|
hr->rem_set()->clear();
|
|
hr->clear_both_card_tables();
|
|
}
|
|
|
|
bool G1FullGCResetMetadataTask::G1ResetMetadataClosure::do_heap_region(G1HeapRegion* hr) {
|
|
uint const region_idx = hr->hrm_index();
|
|
if (!_collector->is_compaction_target(region_idx)) {
|
|
assert(!hr->is_free(), "all free regions should be compaction targets");
|
|
assert(_collector->is_skip_compacting(region_idx), "must be");
|
|
if (hr->needs_scrubbing_during_full_gc()) {
|
|
scrub_skip_compacting_region(hr, hr->is_young());
|
|
}
|
|
if (_collector->is_skip_compacting(region_idx)) {
|
|
reset_skip_compacting(hr);
|
|
}
|
|
}
|
|
// Reset data structures not valid after Full GC.
|
|
reset_region_metadata(hr);
|
|
|
|
return false;
|
|
}
|
|
|
|
void G1FullGCResetMetadataTask::G1ResetMetadataClosure::scrub_skip_compacting_region(G1HeapRegion* hr, bool update_bot_for_live) {
|
|
assert(hr->needs_scrubbing_during_full_gc(), "must be");
|
|
|
|
HeapWord* limit = hr->top();
|
|
HeapWord* current_obj = hr->bottom();
|
|
G1CMBitMap* bitmap = _collector->mark_bitmap();
|
|
|
|
while (current_obj < limit) {
|
|
if (bitmap->is_marked(current_obj)) {
|
|
oop current = cast_to_oop(current_obj);
|
|
size_t size = current->size();
|
|
if (update_bot_for_live) {
|
|
hr->update_bot_for_block(current_obj, current_obj + size);
|
|
}
|
|
current_obj += size;
|
|
continue;
|
|
}
|
|
// Found dead object, which is potentially unloaded, scrub to next
|
|
// marked object.
|
|
HeapWord* scrub_start = current_obj;
|
|
HeapWord* scrub_end = bitmap->get_next_marked_addr(scrub_start, limit);
|
|
assert(scrub_start != scrub_end, "must advance");
|
|
hr->fill_range_with_dead_objects(scrub_start, scrub_end);
|
|
|
|
current_obj = scrub_end;
|
|
}
|
|
}
|
|
|
|
void G1FullGCResetMetadataTask::G1ResetMetadataClosure::reset_skip_compacting(G1HeapRegion* hr) {
|
|
#ifdef ASSERT
|
|
uint region_index = hr->hrm_index();
|
|
assert(_collector->is_skip_compacting(region_index), "Only call on is_skip_compacting regions");
|
|
|
|
if (hr->is_humongous()) {
|
|
oop obj = cast_to_oop(hr->humongous_start_region()->bottom());
|
|
assert(hr->humongous_start_region()->has_pinned_objects() ||
|
|
_collector->mark_bitmap()->is_marked(obj), "must be live");
|
|
} else {
|
|
assert(hr->has_pinned_objects() || _collector->live_words(region_index) > _collector->scope()->region_compaction_threshold(),
|
|
"should be quite full or pinned %u", region_index);
|
|
}
|
|
|
|
assert(_collector->compaction_top(hr) == nullptr,
|
|
"region %u compaction_top " PTR_FORMAT " must not be different from bottom " PTR_FORMAT,
|
|
hr->hrm_index(), p2i(_collector->compaction_top(hr)), p2i(hr->bottom()));
|
|
#endif
|
|
hr->reset_skip_compacting_after_full_gc();
|
|
}
|
|
|
|
void G1FullGCResetMetadataTask::work(uint worker_id) {
|
|
Ticks start = Ticks::now();
|
|
G1ResetMetadataClosure hc(collector());
|
|
G1CollectedHeap::heap()->heap_region_par_iterate_from_worker_offset(&hc, &_claimer, worker_id);
|
|
|
|
log_task("Reset Metadata task", worker_id, start);
|
|
}
|