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/*
* Copyright (c) 2001, 2022, 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/shared/collectedHeap.hpp"
#include "gc/shared/gc_globals.hpp"
#include "gc/shared/plab.inline.hpp"
#include "gc/shared/threadLocalAllocBuffer.hpp"
#include "gc/shared/tlab_globals.hpp"
#include "logging/log.hpp"
#include "memory/universe.hpp"
#include "oops/oop.inline.hpp"
#include "runtime/globals_extension.hpp"
size_t PLAB::min_size() {
// Make sure that we return something that is larger than AlignmentReserve
return align_object_size(MAX2(MinTLABSize / HeapWordSize, (size_t)oopDesc::header_size())) + CollectedHeap::lab_alignment_reserve();
}
size_t PLAB::max_size() {
return ThreadLocalAllocBuffer::max_size();
}
void PLAB::startup_initialization() {
if (!FLAG_IS_DEFAULT(MinTLABSize)) {
if (FLAG_IS_DEFAULT(YoungPLABSize)) {
FLAG_SET_ERGO(YoungPLABSize, MAX2(ThreadLocalAllocBuffer::min_size(), YoungPLABSize));
}
if (FLAG_IS_DEFAULT(OldPLABSize)) {
FLAG_SET_ERGO(OldPLABSize, MAX2(ThreadLocalAllocBuffer::min_size(), OldPLABSize));
}
}
}
PLAB::PLAB(size_t desired_plab_sz_) :
_word_sz(desired_plab_sz_), _bottom(NULL), _top(NULL),
_end(NULL), _hard_end(NULL), _allocated(0), _wasted(0), _undo_wasted(0)
{
assert(min_size() > CollectedHeap::lab_alignment_reserve(),
"Minimum PLAB size " SIZE_FORMAT " must be larger than alignment reserve " SIZE_FORMAT " "
"to be able to contain objects", min_size(), CollectedHeap::lab_alignment_reserve());
}
void PLAB::flush_and_retire_stats(PLABStats* stats) {
// Retire the last allocation buffer.
size_t unused = retire_internal();
// Now flush the statistics.
stats->add_allocated(_allocated);
stats->add_wasted(_wasted);
stats->add_undo_wasted(_undo_wasted);
stats->add_unused(unused);
// Since we have flushed the stats we need to clear the _allocated and _wasted
// fields in case somebody retains an instance of this over GCs. Not doing so
// will artificially inflate the values in the statistics.
_allocated = 0;
_wasted = 0;
_undo_wasted = 0;
}
void PLAB::retire() {
_wasted += retire_internal();
}
size_t PLAB::retire_internal() {
size_t result = 0;
if (_top < _hard_end) {
Universe::heap()->fill_with_dummy_object(_top, _hard_end, true);
result += invalidate();
}
return result;
}
void PLAB::add_undo_waste(HeapWord* obj, size_t word_sz) {
Universe::heap()->fill_with_dummy_object(obj, obj + word_sz, true);
_undo_wasted += word_sz;
}
void PLAB::undo_last_allocation(HeapWord* obj, size_t word_sz) {
assert(pointer_delta(_top, _bottom) >= word_sz, "Bad undo");
assert(pointer_delta(_top, obj) == word_sz, "Bad undo");
_top = obj;
}
void PLAB::undo_allocation(HeapWord* obj, size_t word_sz) {
// Is the alloc in the current alloc buffer?
if (contains(obj)) {
assert(contains(obj + word_sz - 1),
"should contain whole object");
undo_last_allocation(obj, word_sz);
} else {
add_undo_waste(obj, word_sz);
}
}
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