4b3c528140
Refactor into G1RedirtyCardsQueue[Set] and G1DirtyCardQueueSet Reviewed-by: tschatzl, sangheki
117 lines
4.4 KiB
C++
117 lines
4.4 KiB
C++
/*
|
|
* Copyright (c) 2013, 2019, 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/g1CardTableEntryClosure.hpp"
|
|
#include "gc/g1/g1CollectedHeap.inline.hpp"
|
|
#include "gc/g1/g1DirtyCardQueue.hpp"
|
|
#include "gc/g1/g1HotCardCache.hpp"
|
|
#include "runtime/atomic.hpp"
|
|
|
|
G1HotCardCache::G1HotCardCache(G1CollectedHeap *g1h):
|
|
_g1h(g1h), _use_cache(false), _card_counts(g1h),
|
|
_hot_cache(NULL), _hot_cache_size(0), _hot_cache_par_chunk_size(0),
|
|
_hot_cache_idx(0), _hot_cache_par_claimed_idx(0)
|
|
{}
|
|
|
|
void G1HotCardCache::initialize(G1RegionToSpaceMapper* card_counts_storage) {
|
|
if (default_use_cache()) {
|
|
_use_cache = true;
|
|
|
|
_hot_cache_size = (size_t)1 << G1ConcRSLogCacheSize;
|
|
_hot_cache = ArrayAllocator<CardValue*>::allocate(_hot_cache_size, mtGC);
|
|
|
|
reset_hot_cache_internal();
|
|
|
|
// For refining the cards in the hot cache in parallel
|
|
_hot_cache_par_chunk_size = ClaimChunkSize;
|
|
_hot_cache_par_claimed_idx = 0;
|
|
|
|
_card_counts.initialize(card_counts_storage);
|
|
}
|
|
}
|
|
|
|
G1HotCardCache::~G1HotCardCache() {
|
|
if (default_use_cache()) {
|
|
assert(_hot_cache != NULL, "Logic");
|
|
ArrayAllocator<CardValue*>::free(_hot_cache, _hot_cache_size);
|
|
_hot_cache = NULL;
|
|
}
|
|
}
|
|
|
|
CardTable::CardValue* G1HotCardCache::insert(CardValue* card_ptr) {
|
|
uint count = _card_counts.add_card_count(card_ptr);
|
|
if (!_card_counts.is_hot(count)) {
|
|
// The card is not hot so do not store it in the cache;
|
|
// return it for immediate refining.
|
|
return card_ptr;
|
|
}
|
|
// Otherwise, the card is hot.
|
|
size_t index = Atomic::add(1u, &_hot_cache_idx) - 1;
|
|
size_t masked_index = index & (_hot_cache_size - 1);
|
|
CardValue* current_ptr = _hot_cache[masked_index];
|
|
|
|
// Try to store the new card pointer into the cache. Compare-and-swap to guard
|
|
// against the unlikely event of a race resulting in another card pointer to
|
|
// have already been written to the cache. In this case we will return
|
|
// card_ptr in favor of the other option, which would be starting over. This
|
|
// should be OK since card_ptr will likely be the older card already when/if
|
|
// this ever happens.
|
|
CardValue* previous_ptr = Atomic::cmpxchg(card_ptr,
|
|
&_hot_cache[masked_index],
|
|
current_ptr);
|
|
return (previous_ptr == current_ptr) ? previous_ptr : card_ptr;
|
|
}
|
|
|
|
void G1HotCardCache::drain(G1CardTableEntryClosure* cl, uint worker_i) {
|
|
assert(default_use_cache(), "Drain only necessary if we use the hot card cache.");
|
|
|
|
assert(_hot_cache != NULL, "Logic");
|
|
assert(!use_cache(), "cache should be disabled");
|
|
|
|
while (_hot_cache_par_claimed_idx < _hot_cache_size) {
|
|
size_t end_idx = Atomic::add(_hot_cache_par_chunk_size,
|
|
&_hot_cache_par_claimed_idx);
|
|
size_t start_idx = end_idx - _hot_cache_par_chunk_size;
|
|
// The current worker has successfully claimed the chunk [start_idx..end_idx)
|
|
end_idx = MIN2(end_idx, _hot_cache_size);
|
|
for (size_t i = start_idx; i < end_idx; i++) {
|
|
CardValue* card_ptr = _hot_cache[i];
|
|
if (card_ptr != NULL) {
|
|
bool result = cl->do_card_ptr(card_ptr, worker_i);
|
|
assert(result, "Closure should always return true");
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
// The existing entries in the hot card cache, which were just refined
|
|
// above, are discarded prior to re-enabling the cache near the end of the GC.
|
|
}
|
|
|
|
void G1HotCardCache::reset_card_counts(HeapRegion* hr) {
|
|
_card_counts.clear_region(hr);
|
|
}
|