jdk8-mips64-public/hotspot: comparison src/share/vm/gc

-:923ac8d1df95
+:194f52aa2f23
+/*
+* Copyright (c) 2013, 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_implementation/g1/g1CardCounts.hpp"
+#include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
+#include "gc_implementation/g1/g1CollectorPolicy.hpp"
+#include "gc_implementation/g1/g1GCPhaseTimes.hpp"
+#include "memory/cardTableModRefBS.hpp"
+#include "services/memTracker.hpp"
+#include "utilities/copy.hpp"
+void G1CardCounts::clear_range(size_t from_card_num, size_t to_card_num) {
+if (has_count_table()) {
+check_card_num(from_card_num,
+err_msg("from card num out of range: "SIZE_FORMAT, from_card_num));
+assert(from_card_num < to_card_num,
+err_msg("Wrong order? from: " SIZE_FORMAT ", to: "SIZE_FORMAT,
+from_card_num, to_card_num));
+assert(to_card_num <= _committed_max_card_num,
+err_msg("to card num out of range: "
+"to: "SIZE_FORMAT ", "
+"max: "SIZE_FORMAT,
+to_card_num, _committed_max_card_num));
+to_card_num = MIN2(_committed_max_card_num, to_card_num);
+Copy::fill_to_bytes(&_card_counts[from_card_num], (to_card_num - from_card_num));
+}
+}
+G1CardCounts::G1CardCounts(G1CollectedHeap *g1h):
+_g1h(g1h), _card_counts(NULL),
+_reserved_max_card_num(0), _committed_max_card_num(0),
+_committed_size(0) {}
+void G1CardCounts::initialize() {
+assert(_g1h->max_capacity() > 0, "initialization order");
+assert(_g1h->capacity() == 0, "initialization order");
+if (G1ConcRSHotCardLimit > 0) {
+// The max value we can store in the counts table is
+// max_jubyte. Guarantee the value of the hot
+// threshold limit is no more than this.
+guarantee(G1ConcRSHotCardLimit <= max_jubyte, "sanity");
+ModRefBarrierSet* bs = _g1h->mr_bs();
+guarantee(bs->is_a(BarrierSet::CardTableModRef), "Precondition");
+_ct_bs = (CardTableModRefBS*)bs;
+_ct_bot = _ct_bs->byte_for_const(_g1h->reserved_region().start());
+// Allocate/Reserve the counts table
+size_t reserved_bytes = _g1h->max_capacity();
+_reserved_max_card_num = reserved_bytes >> CardTableModRefBS::card_shift;
+size_t reserved_size = _reserved_max_card_num * sizeof(jbyte);
+ReservedSpace rs(ReservedSpace::allocation_align_size_up(reserved_size));
+if (!rs.is_reserved()) {
+warning("Could not reserve enough space for the card counts table");
+guarantee(!has_reserved_count_table(), "should be NULL");
+return;
+}
+MemTracker::record_virtual_memory_type((address)rs.base(), mtGC);
+_card_counts_storage.initialize(rs, 0);
+_card_counts = (jubyte*) _card_counts_storage.low();
+}
+}
+void G1CardCounts::resize(size_t heap_capacity) {
+// Expand the card counts table to handle a heap with the given capacity.
+if (!has_reserved_count_table()) {
+// Don't expand if we failed to reserve the card counts table.
+return;
+}
+assert(_committed_size ==
+ReservedSpace::allocation_align_size_up(_committed_size),
+err_msg("Unaligned? committed_size: " SIZE_FORMAT, _committed_size));
+// Verify that the committed space for the card counts
+// matches our committed max card num.
+size_t prev_committed_size = _committed_size;
+size_t prev_committed_card_num = prev_committed_size / sizeof(jbyte);
+assert(prev_committed_card_num == _committed_max_card_num,
+err_msg("Card mismatch: "
+"prev: " SIZE_FORMAT ", "
+"committed: "SIZE_FORMAT,
+prev_committed_card_num, _committed_max_card_num));
+size_t new_size = (heap_capacity >> CardTableModRefBS::card_shift) * sizeof(jbyte);
+size_t new_committed_size = ReservedSpace::allocation_align_size_up(new_size);
+size_t new_committed_card_num =
+MIN2(_reserved_max_card_num, new_committed_size / sizeof(jbyte));
+if (_committed_max_card_num < new_committed_card_num) {
+// we need to expand the backing store for the card counts
+size_t expand_size = new_committed_size - prev_committed_size;
+if (!_card_counts_storage.expand_by(expand_size)) {
+warning("Card counts table backing store commit failure");
+return;
+}
+assert(_card_counts_storage.committed_size() == new_committed_size,
+"expansion commit failure");
+_committed_size = new_committed_size;
+_committed_max_card_num = new_committed_card_num;
+clear_range(prev_committed_card_num, _committed_max_card_num);
+}
+}
+uint G1CardCounts::add_card_count(jbyte* card_ptr) {
+// Returns the number of times the card has been refined.
+// If we failed to reserve/commit the counts table, return 0.
+// If card_ptr is beyond the committed end of the counts table,
+// return 0.
+// Otherwise return the actual count.
+// Unless G1ConcRSHotCardLimit has been set appropriately,
+// returning 0 will result in the card being considered
+// cold and will be refined immediately.
+uint count = 0;
+if (has_count_table()) {
+size_t card_num = ptr_2_card_num(card_ptr);
+if (card_num < _committed_max_card_num) {
+count = (uint) _card_counts[card_num];
+if (count < G1ConcRSHotCardLimit) {
+_card_counts[card_num] += 1;
+}
+assert(_card_counts[card_num] <= G1ConcRSHotCardLimit,
+err_msg("Refinement count overflow? "
+"new count: "UINT32_FORMAT,
+(uint) _card_counts[card_num]));
+}
+}
+return count;
+}
+bool G1CardCounts::is_hot(uint count) {
+return (count >= G1ConcRSHotCardLimit);
+}
+void G1CardCounts::clear_region(HeapRegion* hr) {
+assert(!hr->isHumongous(), "Should have been cleared");
+if (has_count_table()) {
+HeapWord* bottom = hr->bottom();
+// We use the last address in hr as hr could be the
+// last region in the heap. In which case trying to find
+// the card for hr->end() will be an OOB accesss to the
+// card table.
+HeapWord* last = hr->end() - 1;
+assert(_g1h->g1_committed().contains(last),
+err_msg("last not in committed: "
+"last: " PTR_FORMAT ", "
+"committed: [" PTR_FORMAT ", " PTR_FORMAT ")",
+last,
+_g1h->g1_committed().start(),
+_g1h->g1_committed().end()));
+const jbyte* from_card_ptr = _ct_bs->byte_for_const(bottom);
+const jbyte* last_card_ptr = _ct_bs->byte_for_const(last);
+#ifdef ASSERT
+HeapWord* start_addr = _ct_bs->addr_for(from_card_ptr);
+assert(start_addr == hr->bottom(), "alignment");
+HeapWord* last_addr = _ct_bs->addr_for(last_card_ptr);
+assert((last_addr + CardTableModRefBS::card_size_in_words) == hr->end(), "alignment");
+#endif // ASSERT
+// Clear the counts for the (exclusive) card range.
+size_t from_card_num = ptr_2_card_num(from_card_ptr);
+size_t to_card_num = ptr_2_card_num(last_card_ptr) + 1;
+clear_range(from_card_num, to_card_num);
+}
+}
+void G1CardCounts::clear_all() {
+assert(SafepointSynchronize::is_at_safepoint(), "don't call this otherwise");
+clear_range((size_t)0, _committed_max_card_num);
+}
+G1CardCounts::~G1CardCounts() {
+if (has_reserved_count_table()) {
+_card_counts_storage.release();
+}
+}

comparison: src/share/vm/gc_implementation/g1/g1CardCounts.cpp

src/share/vm/gc_implementation/g1/g1CardCounts.cpp

Mercurial > jdk8-mips64-public > hotspot / file comparison

comparison: src/share/vm/gc_implementation/g1/g1CardCounts.cpp

src/share/vm/gc_implementation/g1/g1CardCounts.cpp