--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/gc_implementation/g1/sparsePRT.cpp Thu Jun 05 15:57:56 2008 -0700
@@ -0,0 +1,530 @@
+/*
+ * Copyright 2001-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+#include "incls/_precompiled.incl"
+#include "incls/_sparsePRT.cpp.incl"
+
+#define SPARSE_PRT_VERBOSE 0
+
+#define UNROLL_CARD_LOOPS 1
+
+void SparsePRT::init_iterator(SparsePRTIter* sprt_iter) {
+ sprt_iter->init(this);
+}
+
+void SparsePRTEntry::init(short region_ind) {
+ _region_ind = region_ind;
+ _next_index = NullEntry;
+#if UNROLL_CARD_LOOPS
+ assert(CardsPerEntry == 4, "Assumption. If changes, un-unroll.");
+ _cards[0] = NullEntry;
+ _cards[1] = NullEntry;
+ _cards[2] = NullEntry;
+ _cards[3] = NullEntry;
+#else
+ for (int i = 0; i < CardsPerEntry; i++) _cards[i] = NullEntry;
+#endif
+}
+
+bool SparsePRTEntry::contains_card(short card_index) const {
+#if UNROLL_CARD_LOOPS
+ assert(CardsPerEntry == 4, "Assumption. If changes, un-unroll.");
+ if (_cards[0] == card_index) return true;
+ if (_cards[1] == card_index) return true;
+ if (_cards[2] == card_index) return true;
+ if (_cards[3] == card_index) return true;
+#else
+ for (int i = 0; i < CardsPerEntry; i++) {
+ if (_cards[i] == card_index) return true;
+ }
+#endif
+ // Otherwise, we're full.
+ return false;
+}
+
+int SparsePRTEntry::num_valid_cards() const {
+ int sum = 0;
+#if UNROLL_CARD_LOOPS
+ assert(CardsPerEntry == 4, "Assumption. If changes, un-unroll.");
+ if (_cards[0] != NullEntry) sum++;
+ if (_cards[1] != NullEntry) sum++;
+ if (_cards[2] != NullEntry) sum++;
+ if (_cards[3] != NullEntry) sum++;
+#else
+ for (int i = 0; i < CardsPerEntry; i++) {
+ if (_cards[i] != NulLEntry) sum++;
+ }
+#endif
+ // Otherwise, we're full.
+ return sum;
+}
+
+SparsePRTEntry::AddCardResult SparsePRTEntry::add_card(short card_index) {
+#if UNROLL_CARD_LOOPS
+ assert(CardsPerEntry == 4, "Assumption. If changes, un-unroll.");
+ short c = _cards[0];
+ if (c == card_index) return found;
+ if (c == NullEntry) { _cards[0] = card_index; return added; }
+ c = _cards[1];
+ if (c == card_index) return found;
+ if (c == NullEntry) { _cards[1] = card_index; return added; }
+ c = _cards[2];
+ if (c == card_index) return found;
+ if (c == NullEntry) { _cards[2] = card_index; return added; }
+ c = _cards[3];
+ if (c == card_index) return found;
+ if (c == NullEntry) { _cards[3] = card_index; return added; }
+#else
+ for (int i = 0; i < CardsPerEntry; i++) {
+ short c = _cards[i];
+ if (c == card_index) return found;
+ if (c == NullEntry) { _cards[i] = card_index; return added; }
+ }
+#endif
+ // Otherwise, we're full.
+ return overflow;
+}
+
+void SparsePRTEntry::copy_cards(short* cards) const {
+#if UNROLL_CARD_LOOPS
+ assert(CardsPerEntry == 4, "Assumption. If changes, un-unroll.");
+ cards[0] = _cards[0];
+ cards[1] = _cards[1];
+ cards[2] = _cards[2];
+ cards[3] = _cards[3];
+#else
+ for (int i = 0; i < CardsPerEntry; i++) {
+ cards[i] = _cards[i];
+ }
+#endif
+}
+
+void SparsePRTEntry::copy_cards(SparsePRTEntry* e) const {
+ copy_cards(&e->_cards[0]);
+}
+
+// ----------------------------------------------------------------------
+
+RSHashTable::RSHashTable(size_t capacity) :
+ _capacity(capacity), _capacity_mask(capacity-1),
+ _occupied_entries(0), _occupied_cards(0),
+ _entries(NEW_C_HEAP_ARRAY(SparsePRTEntry, capacity)),
+ _buckets(NEW_C_HEAP_ARRAY(short, capacity)),
+ _next_deleted(NULL), _deleted(false),
+ _free_list(NullEntry), _free_region(0)
+{
+ clear();
+}
+
+RSHashTable::~RSHashTable() {
+ if (_entries != NULL) {
+ FREE_C_HEAP_ARRAY(SparsePRTEntry, _entries);
+ _entries = NULL;
+ }
+ if (_buckets != NULL) {
+ FREE_C_HEAP_ARRAY(short, _buckets);
+ _buckets = NULL;
+ }
+}
+
+void RSHashTable::clear() {
+ _occupied_entries = 0;
+ _occupied_cards = 0;
+ guarantee(_entries != NULL, "INV");
+ guarantee(_buckets != NULL, "INV");
+ // This will put -1 == NullEntry in the key field of all entries.
+ memset(_entries, -1, _capacity * sizeof(SparsePRTEntry));
+ memset(_buckets, -1, _capacity * sizeof(short));
+ _free_list = NullEntry;
+ _free_region = 0;
+}
+
+bool RSHashTable::add_card(short region_ind, short card_index) {
+ SparsePRTEntry* e = entry_for_region_ind_create(region_ind);
+ assert(e != NULL && e->r_ind() == region_ind,
+ "Postcondition of call above.");
+ SparsePRTEntry::AddCardResult res = e->add_card(card_index);
+ if (res == SparsePRTEntry::added) _occupied_cards++;
+#if SPARSE_PRT_VERBOSE
+ gclog_or_tty->print_cr(" after add_card[%d]: valid-cards = %d.",
+ pointer_delta(e, _entries, sizeof(SparsePRTEntry)),
+ e->num_valid_cards());
+#endif
+ assert(e->num_valid_cards() > 0, "Postcondition");
+ return res != SparsePRTEntry::overflow;
+}
+
+bool RSHashTable::get_cards(short region_ind, short* cards) {
+ short ind = (short) (region_ind & capacity_mask());
+ short cur_ind = _buckets[ind];
+ SparsePRTEntry* cur;
+ while (cur_ind != NullEntry &&
+ (cur = entry(cur_ind))->r_ind() != region_ind) {
+ cur_ind = cur->next_index();
+ }
+
+ if (cur_ind == NullEntry) return false;
+ // Otherwise...
+ assert(cur->r_ind() == region_ind, "Postcondition of loop + test above.");
+ assert(cur->num_valid_cards() > 0, "Inv");
+ cur->copy_cards(cards);
+ return true;
+}
+
+bool RSHashTable::delete_entry(short region_ind) {
+ short ind = (short) (region_ind & capacity_mask());
+ short* prev_loc = &_buckets[ind];
+ short cur_ind = *prev_loc;
+ SparsePRTEntry* cur;
+ while (cur_ind != NullEntry &&
+ (cur = entry(cur_ind))->r_ind() != region_ind) {
+ prev_loc = cur->next_index_addr();
+ cur_ind = *prev_loc;
+ }
+
+ if (cur_ind == NullEntry) return false;
+ // Otherwise, splice out "cur".
+ *prev_loc = cur->next_index();
+ _occupied_cards -= cur->num_valid_cards();
+ free_entry(cur_ind);
+ _occupied_entries--;
+ return true;
+}
+
+SparsePRTEntry* RSHashTable::entry_for_region_ind(short region_ind) const {
+ assert(occupied_entries() < capacity(), "Precondition");
+ short ind = (short) (region_ind & capacity_mask());
+ short cur_ind = _buckets[ind];
+ SparsePRTEntry* cur;
+ // XXX
+ // int k = 0;
+ while (cur_ind != NullEntry &&
+ (cur = entry(cur_ind))->r_ind() != region_ind) {
+ /*
+ k++;
+ if (k > 10) {
+ gclog_or_tty->print_cr("RSHashTable::entry_for_region_ind(%d): "
+ "k = %d, cur_ind = %d.", region_ind, k, cur_ind);
+ if (k >= 1000) {
+ while (1) ;
+ }
+ }
+ */
+ cur_ind = cur->next_index();
+ }
+
+ if (cur_ind != NullEntry) {
+ assert(cur->r_ind() == region_ind, "Loop postcondition + test");
+ return cur;
+ } else {
+ return NULL;
+ }
+}
+
+SparsePRTEntry* RSHashTable::entry_for_region_ind_create(short region_ind) {
+ SparsePRTEntry* res = entry_for_region_ind(region_ind);
+ if (res == NULL) {
+ short new_ind = alloc_entry();
+ assert(0 <= new_ind && (size_t)new_ind < capacity(), "There should be room.");
+ res = entry(new_ind);
+ res->init(region_ind);
+ // Insert at front.
+ short ind = (short) (region_ind & capacity_mask());
+ res->set_next_index(_buckets[ind]);
+ _buckets[ind] = new_ind;
+ _occupied_entries++;
+ }
+ return res;
+}
+
+short RSHashTable::alloc_entry() {
+ short res;
+ if (_free_list != NullEntry) {
+ res = _free_list;
+ _free_list = entry(res)->next_index();
+ return res;
+ } else if ((size_t) _free_region+1 < capacity()) {
+ res = _free_region;
+ _free_region++;
+ return res;
+ } else {
+ return NullEntry;
+ }
+}
+
+
+void RSHashTable::free_entry(short fi) {
+ entry(fi)->set_next_index(_free_list);
+ _free_list = fi;
+}
+
+
+void RSHashTable::add_entry(SparsePRTEntry* e) {
+ assert(e->num_valid_cards() > 0, "Precondition.");
+ SparsePRTEntry* e2 = entry_for_region_ind_create(e->r_ind());
+ e->copy_cards(e2);
+ _occupied_cards += e2->num_valid_cards();
+ assert(e2->num_valid_cards() > 0, "Postcondition.");
+}
+
+RSHashTable* RSHashTable::_head_deleted_list = NULL;
+
+void RSHashTable::add_to_deleted_list(RSHashTable* rsht) {
+ assert(!rsht->deleted(), "Should delete only once.");
+ rsht->set_deleted(true);
+ RSHashTable* hd = _head_deleted_list;
+ while (true) {
+ rsht->_next_deleted = hd;
+ RSHashTable* res =
+ (RSHashTable*)
+ Atomic::cmpxchg_ptr(rsht, &_head_deleted_list, hd);
+ if (res == hd) return;
+ else hd = res;
+ }
+}
+
+RSHashTable* RSHashTable::get_from_deleted_list() {
+ RSHashTable* hd = _head_deleted_list;
+ while (hd != NULL) {
+ RSHashTable* next = hd->next_deleted();
+ RSHashTable* res =
+ (RSHashTable*)
+ Atomic::cmpxchg_ptr(next, &_head_deleted_list, hd);
+ if (res == hd) {
+ hd->set_next_deleted(NULL);
+ hd->set_deleted(false);
+ return hd;
+ } else {
+ hd = res;
+ }
+ }
+ return NULL;
+}
+
+short /* RSHashTable:: */ RSHashTableIter::find_first_card_in_list() {
+ short res;
+ while (_bl_ind != RSHashTable::NullEntry) {
+ res = _rsht->entry(_bl_ind)->card(0);
+ if (res != SparsePRTEntry::NullEntry) {
+ return res;
+ } else {
+ _bl_ind = _rsht->entry(_bl_ind)->next_index();
+ }
+ }
+ // Otherwise, none found:
+ return SparsePRTEntry::NullEntry;
+}
+
+size_t /* RSHashTable:: */ RSHashTableIter::compute_card_ind(short ci) {
+ return
+ _heap_bot_card_ind
+ + (_rsht->entry(_bl_ind)->r_ind() * CardsPerRegion)
+ + ci;
+}
+
+bool /* RSHashTable:: */ RSHashTableIter::has_next(size_t& card_index) {
+ _card_ind++;
+ short ci;
+ if (_card_ind < SparsePRTEntry::CardsPerEntry &&
+ ((ci = _rsht->entry(_bl_ind)->card(_card_ind)) !=
+ SparsePRTEntry::NullEntry)) {
+ card_index = compute_card_ind(ci);
+ return true;
+ }
+ // Otherwise, must find the next valid entry.
+ _card_ind = 0;
+
+ if (_bl_ind != RSHashTable::NullEntry) {
+ _bl_ind = _rsht->entry(_bl_ind)->next_index();
+ ci = find_first_card_in_list();
+ if (ci != SparsePRTEntry::NullEntry) {
+ card_index = compute_card_ind(ci);
+ return true;
+ }
+ }
+ // If we didn't return above, must go to the next non-null table index.
+ _tbl_ind++;
+ while ((size_t)_tbl_ind < _rsht->capacity()) {
+ _bl_ind = _rsht->_buckets[_tbl_ind];
+ ci = find_first_card_in_list();
+ if (ci != SparsePRTEntry::NullEntry) {
+ card_index = compute_card_ind(ci);
+ return true;
+ }
+ // Otherwise, try next entry.
+ _tbl_ind++;
+ }
+ // Otherwise, there were no entry.
+ return false;
+}
+
+bool RSHashTable::contains_card(short region_index, short card_index) const {
+ SparsePRTEntry* e = entry_for_region_ind(region_index);
+ return (e != NULL && e->contains_card(card_index));
+}
+
+size_t RSHashTable::mem_size() const {
+ return sizeof(this) + capacity() * (sizeof(SparsePRTEntry) + sizeof(short));
+}
+
+
+// ----------------------------------------------------------------------
+
+SparsePRT* SparsePRT::_head_expanded_list = NULL;
+
+void SparsePRT::add_to_expanded_list(SparsePRT* sprt) {
+ // We could expand multiple times in a pause -- only put on list once.
+ if (sprt->expanded()) return;
+ sprt->set_expanded(true);
+ SparsePRT* hd = _head_expanded_list;
+ while (true) {
+ sprt->_next_expanded = hd;
+ SparsePRT* res =
+ (SparsePRT*)
+ Atomic::cmpxchg_ptr(sprt, &_head_expanded_list, hd);
+ if (res == hd) return;
+ else hd = res;
+ }
+}
+
+SparsePRT* SparsePRT::get_from_expanded_list() {
+ SparsePRT* hd = _head_expanded_list;
+ while (hd != NULL) {
+ SparsePRT* next = hd->next_expanded();
+ SparsePRT* res =
+ (SparsePRT*)
+ Atomic::cmpxchg_ptr(next, &_head_expanded_list, hd);
+ if (res == hd) {
+ hd->set_next_expanded(NULL);
+ return hd;
+ } else {
+ hd = res;
+ }
+ }
+ return NULL;
+}
+
+
+void SparsePRT::cleanup_all() {
+ // First clean up all expanded tables so they agree on next and cur.
+ SparsePRT* sprt = get_from_expanded_list();
+ while (sprt != NULL) {
+ sprt->cleanup();
+ sprt = get_from_expanded_list();
+ }
+ // Now delete all deleted RSHashTables.
+ RSHashTable* rsht = RSHashTable::get_from_deleted_list();
+ while (rsht != NULL) {
+#if SPARSE_PRT_VERBOSE
+ gclog_or_tty->print_cr("About to delete RSHT " PTR_FORMAT ".", rsht);
+#endif
+ delete rsht;
+ rsht = RSHashTable::get_from_deleted_list();
+ }
+}
+
+
+SparsePRT::SparsePRT(HeapRegion* hr) :
+ _expanded(false), _next_expanded(NULL)
+{
+ _cur = new RSHashTable(InitialCapacity);
+ _next = _cur;
+}
+
+SparsePRT::~SparsePRT() {
+ assert(_next != NULL && _cur != NULL, "Inv");
+ if (_cur != _next) { delete _cur; }
+ delete _next;
+}
+
+
+size_t SparsePRT::mem_size() const {
+ // We ignore "_cur" here, because it either = _next, or else it is
+ // on the deleted list.
+ return sizeof(this) + _next->mem_size();
+}
+
+bool SparsePRT::add_card(short region_id, short card_index) {
+#if SPARSE_PRT_VERBOSE
+ gclog_or_tty->print_cr(" Adding card %d from region %d to region %d sparse.",
+ card_index, region_id, _hr->hrs_index());
+#endif
+ if (_next->occupied_entries() * 2 > _next->capacity()) {
+ expand();
+ }
+ return _next->add_card(region_id, card_index);
+}
+
+bool SparsePRT::get_cards(short region_id, short* cards) {
+ return _next->get_cards(region_id, cards);
+}
+
+bool SparsePRT::delete_entry(short region_id) {
+ return _next->delete_entry(region_id);
+}
+
+void SparsePRT::clear() {
+ // If they differ, _next is bigger then cur, so next has no chance of
+ // being the initial size.
+ if (_next != _cur) {
+ delete _next;
+ }
+
+ if (_cur->capacity() != InitialCapacity) {
+ delete _cur;
+ _cur = new RSHashTable(InitialCapacity);
+ } else {
+ _cur->clear();
+ }
+ _next = _cur;
+}
+
+void SparsePRT::cleanup() {
+ // Make sure that the current and next tables agree. (Another mechanism
+ // takes care of deleting now-unused tables.)
+ _cur = _next;
+}
+
+void SparsePRT::expand() {
+ RSHashTable* last = _next;
+ _next = new RSHashTable(last->capacity() * 2);
+
+#if SPARSE_PRT_VERBOSE
+ gclog_or_tty->print_cr(" Expanded sparse table for %d to %d.",
+ _hr->hrs_index(), _next->capacity());
+#endif
+ for (size_t i = 0; i < last->capacity(); i++) {
+ SparsePRTEntry* e = last->entry((int)i);
+ if (e->valid_entry()) {
+#if SPARSE_PRT_VERBOSE
+ gclog_or_tty->print_cr(" During expansion, transferred entry for %d.",
+ e->r_ind());
+#endif
+ _next->add_entry(e);
+ }
+ }
+ if (last != _cur)
+ RSHashTable::add_to_deleted_list(last);
+ add_to_expanded_list(this);
+}