261e7583ab
Measure HCC processing time separately and remove that time from the calculation of the refinement thresholds. HCC processing time is still taken into account for general pause time predictions. Reviewed-by: tbenson, jmasa
120 lines
4.3 KiB
C++
120 lines
4.3 KiB
C++
/*
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* Copyright (c) 2013, 2015, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#include "gc/g1/dirtyCardQueue.hpp"
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#include "gc/g1/g1CollectedHeap.inline.hpp"
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#include "gc/g1/g1HotCardCache.hpp"
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#include "runtime/atomic.inline.hpp"
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G1HotCardCache::G1HotCardCache(G1CollectedHeap *g1h):
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_g1h(g1h), _hot_cache(NULL), _use_cache(false), _card_counts(g1h) {}
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void G1HotCardCache::initialize(G1RegionToSpaceMapper* card_counts_storage) {
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if (default_use_cache()) {
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_use_cache = true;
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_hot_cache_size = (size_t)1 << G1ConcRSLogCacheSize;
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_hot_cache = _hot_cache_memory.allocate(_hot_cache_size);
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reset_hot_cache_internal();
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// For refining the cards in the hot cache in parallel
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_hot_cache_par_chunk_size = ClaimChunkSize;
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_hot_cache_par_claimed_idx = 0;
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_card_counts.initialize(card_counts_storage);
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}
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}
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G1HotCardCache::~G1HotCardCache() {
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if (default_use_cache()) {
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assert(_hot_cache != NULL, "Logic");
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_hot_cache_memory.free();
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_hot_cache = NULL;
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}
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}
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jbyte* G1HotCardCache::insert(jbyte* card_ptr) {
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uint count = _card_counts.add_card_count(card_ptr);
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if (!_card_counts.is_hot(count)) {
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// The card is not hot so do not store it in the cache;
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// return it for immediate refining.
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return card_ptr;
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}
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// Otherwise, the card is hot.
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size_t index = Atomic::add(1, &_hot_cache_idx) - 1;
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size_t masked_index = index & (_hot_cache_size - 1);
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jbyte* current_ptr = _hot_cache[masked_index];
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// Try to store the new card pointer into the cache. Compare-and-swap to guard
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// against the unlikely event of a race resulting in another card pointer to
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// have already been written to the cache. In this case we will return
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// card_ptr in favor of the other option, which would be starting over. This
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// should be OK since card_ptr will likely be the older card already when/if
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// this ever happens.
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jbyte* previous_ptr = (jbyte*)Atomic::cmpxchg_ptr(card_ptr,
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&_hot_cache[masked_index],
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current_ptr);
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return (previous_ptr == current_ptr) ? previous_ptr : card_ptr;
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}
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void G1HotCardCache::drain(CardTableEntryClosure* cl, uint worker_i) {
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if (!default_use_cache()) {
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assert(_hot_cache == NULL, "Logic");
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return;
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}
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assert(_hot_cache != NULL, "Logic");
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assert(!use_cache(), "cache should be disabled");
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while (_hot_cache_par_claimed_idx < _hot_cache_size) {
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size_t end_idx = Atomic::add(_hot_cache_par_chunk_size,
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&_hot_cache_par_claimed_idx);
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size_t start_idx = end_idx - _hot_cache_par_chunk_size;
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// The current worker has successfully claimed the chunk [start_idx..end_idx)
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end_idx = MIN2(end_idx, _hot_cache_size);
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for (size_t i = start_idx; i < end_idx; i++) {
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jbyte* card_ptr = _hot_cache[i];
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if (card_ptr != NULL) {
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bool result = cl->do_card_ptr(card_ptr, worker_i);
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assert(result, "Closure should always return true");
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} else {
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break;
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}
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}
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}
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// The existing entries in the hot card cache, which were just refined
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// above, are discarded prior to re-enabling the cache near the end of the GC.
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}
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void G1HotCardCache::reset_card_counts(HeapRegion* hr) {
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_card_counts.clear_region(hr);
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}
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void G1HotCardCache::reset_card_counts() {
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_card_counts.clear_all();
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}
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