6929e0f05a
Improve G1 worst-case latencies by making the full GC parallel. Reviewed-by: tschatzl, sangheki, ehelin
76 lines
2.7 KiB
C++
76 lines
2.7 KiB
C++
/*
|
|
* Copyright (c) 2017, 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 "precompiled.hpp"
|
|
#include "gc/g1/g1CollectedHeap.inline.hpp"
|
|
#include "gc/g1/g1ConcurrentMarkBitMap.inline.hpp"
|
|
#include "gc/g1/heapRegion.hpp"
|
|
#include "memory/virtualspace.hpp"
|
|
|
|
void G1CMBitMap::print_on_error(outputStream* st, const char* prefix) const {
|
|
_bm.print_on_error(st, prefix);
|
|
}
|
|
|
|
size_t G1CMBitMap::compute_size(size_t heap_size) {
|
|
return ReservedSpace::allocation_align_size_up(heap_size / mark_distance());
|
|
}
|
|
|
|
size_t G1CMBitMap::mark_distance() {
|
|
return MinObjAlignmentInBytes * BitsPerByte;
|
|
}
|
|
|
|
void G1CMBitMap::initialize(MemRegion heap, G1RegionToSpaceMapper* storage) {
|
|
_covered = heap;
|
|
|
|
_bm = BitMapView((BitMap::bm_word_t*) storage->reserved().start(), _covered.word_size() >> _shifter);
|
|
|
|
storage->set_mapping_changed_listener(&_listener);
|
|
}
|
|
|
|
void G1CMBitMapMappingChangedListener::on_commit(uint start_region, size_t num_regions, bool zero_filled) {
|
|
if (zero_filled) {
|
|
return;
|
|
}
|
|
// We need to clear the bitmap on commit, removing any existing information.
|
|
MemRegion mr(G1CollectedHeap::heap()->bottom_addr_for_region(start_region), num_regions * HeapRegion::GrainWords);
|
|
_bm->clear_range(mr);
|
|
}
|
|
|
|
void G1CMBitMap::clear_range(MemRegion mr) {
|
|
MemRegion intersection = mr.intersection(_covered);
|
|
assert(!intersection.is_empty(),
|
|
"Given range from " PTR_FORMAT " to " PTR_FORMAT " is completely outside the heap",
|
|
p2i(mr.start()), p2i(mr.end()));
|
|
// convert address range into offset range
|
|
_bm.at_put_range(addr_to_offset(intersection.start()),
|
|
addr_to_offset(intersection.end()), false);
|
|
}
|
|
|
|
void G1CMBitMap::clear_region(HeapRegion* region) {
|
|
if (!region->is_empty()) {
|
|
MemRegion mr(region->bottom(), region->top());
|
|
clear_range(mr);
|
|
}
|
|
}
|