--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/gc_implementation/g1/heapRegionSet.cpp Wed Jan 19 19:30:42 2011 -0500
@@ -0,0 +1,438 @@
+/*
+ * Copyright (c) 2011, 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/heapRegionSet.inline.hpp"
+
+size_t HeapRegionSetBase::_unrealistically_long_length = 0;
+
+//////////////////// HeapRegionSetBase ////////////////////
+
+void HeapRegionSetBase::set_unrealistically_long_length(size_t len) {
+ guarantee(_unrealistically_long_length == 0, "should only be set once");
+ _unrealistically_long_length = len;
+}
+
+size_t HeapRegionSetBase::calculate_region_num(HeapRegion* hr) {
+ assert(hr->startsHumongous(), "pre-condition");
+ assert(hr->capacity() % HeapRegion::GrainBytes == 0, "invariant");
+ size_t region_num = hr->capacity() >> HeapRegion::LogOfHRGrainBytes;
+ assert(region_num > 0, "sanity");
+ return region_num;
+}
+
+void HeapRegionSetBase::fill_in_ext_msg(hrl_ext_msg* msg, const char* message) {
+ msg->append("[%s] %s "
+ "ln: "SIZE_FORMAT" rn: "SIZE_FORMAT" "
+ "cy: "SIZE_FORMAT" ud: "SIZE_FORMAT,
+ name(), message, length(), region_num(),
+ total_capacity_bytes(), total_used_bytes());
+ fill_in_ext_msg_extra(msg);
+}
+
+bool HeapRegionSetBase::verify_region(HeapRegion* hr,
+ HeapRegionSetBase* expected_containing_set) {
+ const char* error_message = NULL;
+
+ if (!regions_humongous()) {
+ if (hr->isHumongous()) {
+ error_message = "the region should not be humongous";
+ }
+ } else {
+ if (!hr->isHumongous() || !hr->startsHumongous()) {
+ error_message = "the region should be 'starts humongous'";
+ }
+ }
+
+ if (!regions_empty()) {
+ if (hr->is_empty()) {
+ error_message = "the region should not be empty";
+ }
+ } else {
+ if (!hr->is_empty()) {
+ error_message = "the region should be empty";
+ }
+ }
+
+#ifdef ASSERT
+ // The _containing_set field is only available when ASSERT is defined.
+ if (hr->containing_set() != expected_containing_set) {
+ error_message = "inconsistent containing set found";
+ }
+#endif // ASSERT
+
+ const char* extra_error_message = verify_region_extra(hr);
+ if (extra_error_message != NULL) {
+ error_message = extra_error_message;
+ }
+
+ if (error_message != NULL) {
+ outputStream* out = tty;
+ out->cr();
+ out->print_cr("## [%s] %s", name(), error_message);
+ out->print_cr("## Offending Region: "PTR_FORMAT, hr);
+ out->print_cr(" "HR_FORMAT, HR_FORMAT_PARAMS(hr));
+#ifdef ASSERT
+ out->print_cr(" containing set: "PTR_FORMAT, hr->containing_set());
+#endif // ASSERT
+ out->print_cr("## Offending Region Set: "PTR_FORMAT, this);
+ print_on(out);
+ return false;
+ } else {
+ return true;
+ }
+}
+
+void HeapRegionSetBase::verify() {
+ // It's important that we also observe the MT safety protocol even
+ // for the verification calls. If we do verification without the
+ // appropriate locks and the set changes underneath our feet
+ // verification might fail and send us on a wild goose chase.
+ hrl_assert_mt_safety_ok(this);
+
+ guarantee(( is_empty() && length() == 0 && region_num() == 0 &&
+ total_used_bytes() == 0 && total_capacity_bytes() == 0) ||
+ (!is_empty() && length() >= 0 && region_num() >= 0 &&
+ total_used_bytes() >= 0 && total_capacity_bytes() >= 0),
+ hrl_ext_msg(this, "invariant"));
+
+ guarantee((!regions_humongous() && region_num() == length()) ||
+ ( regions_humongous() && region_num() >= length()),
+ hrl_ext_msg(this, "invariant"));
+
+ guarantee(!regions_empty() || total_used_bytes() == 0,
+ hrl_ext_msg(this, "invariant"));
+
+ guarantee(total_used_bytes() <= total_capacity_bytes(),
+ hrl_ext_msg(this, "invariant"));
+}
+
+void HeapRegionSetBase::verify_start() {
+ // See comment in verify() about MT safety and verification.
+ hrl_assert_mt_safety_ok(this);
+ assert(!_verify_in_progress,
+ hrl_ext_msg(this, "verification should not be in progress"));
+
+ // Do the basic verification first before we do the checks over the regions.
+ HeapRegionSetBase::verify();
+
+ _calc_length = 0;
+ _calc_region_num = 0;
+ _calc_total_capacity_bytes = 0;
+ _calc_total_used_bytes = 0;
+ _verify_in_progress = true;
+}
+
+void HeapRegionSetBase::verify_next_region(HeapRegion* hr) {
+ // See comment in verify() about MT safety and verification.
+ hrl_assert_mt_safety_ok(this);
+ assert(_verify_in_progress,
+ hrl_ext_msg(this, "verification should be in progress"));
+
+ guarantee(verify_region(hr, this), hrl_ext_msg(this, "region verification"));
+
+ _calc_length += 1;
+ if (!hr->isHumongous()) {
+ _calc_region_num += 1;
+ } else {
+ _calc_region_num += calculate_region_num(hr);
+ }
+ _calc_total_capacity_bytes += hr->capacity();
+ _calc_total_used_bytes += hr->used();
+}
+
+void HeapRegionSetBase::verify_end() {
+ // See comment in verify() about MT safety and verification.
+ hrl_assert_mt_safety_ok(this);
+ assert(_verify_in_progress,
+ hrl_ext_msg(this, "verification should be in progress"));
+
+ guarantee(length() == _calc_length,
+ hrl_err_msg("[%s] length: "SIZE_FORMAT" should be == "
+ "calc length: "SIZE_FORMAT,
+ name(), length(), _calc_length));
+
+ guarantee(region_num() == _calc_region_num,
+ hrl_err_msg("[%s] region num: "SIZE_FORMAT" should be == "
+ "calc region num: "SIZE_FORMAT,
+ name(), region_num(), _calc_region_num));
+
+ guarantee(total_capacity_bytes() == _calc_total_capacity_bytes,
+ hrl_err_msg("[%s] capacity bytes: "SIZE_FORMAT" should be == "
+ "calc capacity bytes: "SIZE_FORMAT,
+ name(),
+ total_capacity_bytes(), _calc_total_capacity_bytes));
+
+ guarantee(total_used_bytes() == _calc_total_used_bytes,
+ hrl_err_msg("[%s] used bytes: "SIZE_FORMAT" should be == "
+ "calc used bytes: "SIZE_FORMAT,
+ name(), total_used_bytes(), _calc_total_used_bytes));
+
+ _verify_in_progress = false;
+}
+
+void HeapRegionSetBase::print_on(outputStream* out, bool print_contents) {
+ out->cr();
+ out->print_cr("Set: %s ("PTR_FORMAT")", name(), this);
+ out->print_cr(" Region Assumptions");
+ out->print_cr(" humongous : %s", BOOL_TO_STR(regions_humongous()));
+ out->print_cr(" empty : %s", BOOL_TO_STR(regions_empty()));
+ out->print_cr(" Attributes");
+ out->print_cr(" length : "SIZE_FORMAT_W(14), length());
+ out->print_cr(" region num : "SIZE_FORMAT_W(14), region_num());
+ out->print_cr(" total capacity : "SIZE_FORMAT_W(14)" bytes",
+ total_capacity_bytes());
+ out->print_cr(" total used : "SIZE_FORMAT_W(14)" bytes",
+ total_used_bytes());
+}
+
+void HeapRegionSetBase::clear() {
+ _length = 0;
+ _region_num = 0;
+ _total_used_bytes = 0;
+}
+
+HeapRegionSetBase::HeapRegionSetBase(const char* name)
+ : _name(name), _verify_in_progress(false),
+ _calc_length(0), _calc_region_num(0),
+ _calc_total_capacity_bytes(0), _calc_total_used_bytes(0) { }
+
+//////////////////// HeapRegionSet ////////////////////
+
+void HeapRegionSet::update_from_proxy(HeapRegionSet* proxy_set) {
+ hrl_assert_mt_safety_ok(this);
+ hrl_assert_mt_safety_ok(proxy_set);
+ hrl_assert_sets_match(this, proxy_set);
+
+ verify_optional();
+ proxy_set->verify_optional();
+
+ if (proxy_set->is_empty()) return;
+
+ assert(proxy_set->length() <= _length,
+ hrl_err_msg("[%s] proxy set length: "SIZE_FORMAT" "
+ "should be <= length: "SIZE_FORMAT,
+ name(), proxy_set->length(), _length));
+ _length -= proxy_set->length();
+
+ assert(proxy_set->region_num() <= _region_num,
+ hrl_err_msg("[%s] proxy set region num: "SIZE_FORMAT" "
+ "should be <= region num: "SIZE_FORMAT,
+ name(), proxy_set->region_num(), _region_num));
+ _region_num -= proxy_set->region_num();
+
+ assert(proxy_set->total_used_bytes() <= _total_used_bytes,
+ hrl_err_msg("[%s] proxy set used bytes: "SIZE_FORMAT" "
+ "should be <= used bytes: "SIZE_FORMAT,
+ name(), proxy_set->total_used_bytes(),
+ _total_used_bytes));
+ _total_used_bytes -= proxy_set->total_used_bytes();
+
+ proxy_set->clear();
+
+ verify_optional();
+ proxy_set->verify_optional();
+}
+
+//////////////////// HeapRegionLinkedList ////////////////////
+
+void HeapRegionLinkedList::fill_in_ext_msg_extra(hrl_ext_msg* msg) {
+ msg->append(" hd: "PTR_FORMAT" tl: "PTR_FORMAT, head(), tail());
+}
+
+void HeapRegionLinkedList::add_as_tail(HeapRegionLinkedList* from_list) {
+ hrl_assert_mt_safety_ok(this);
+ hrl_assert_mt_safety_ok(from_list);
+
+ verify_optional();
+ from_list->verify_optional();
+
+ if (from_list->is_empty()) return;
+
+#ifdef ASSERT
+ HeapRegionLinkedListIterator iter(from_list);
+ while (iter.more_available()) {
+ HeapRegion* hr = iter.get_next();
+ // In set_containing_set() we check that we either set the value
+ // from NULL to non-NULL or vice versa to catch bugs. So, we have
+ // to NULL it first before setting it to the value.
+ hr->set_containing_set(NULL);
+ hr->set_containing_set(this);
+ }
+#endif // ASSERT
+
+ if (_tail != NULL) {
+ assert(length() > 0 && _head != NULL, hrl_ext_msg(this, "invariant"));
+ _tail->set_next(from_list->_head);
+ } else {
+ assert(length() == 0 && _head == NULL, hrl_ext_msg(this, "invariant"));
+ _head = from_list->_head;
+ }
+ _tail = from_list->_tail;
+
+ _length += from_list->length();
+ _region_num += from_list->region_num();
+ _total_used_bytes += from_list->total_used_bytes();
+ from_list->clear();
+
+ verify_optional();
+ from_list->verify_optional();
+}
+
+void HeapRegionLinkedList::remove_all() {
+ hrl_assert_mt_safety_ok(this);
+ verify_optional();
+
+ HeapRegion* curr = _head;
+ while (curr != NULL) {
+ hrl_assert_region_ok(this, curr, this);
+
+ HeapRegion* next = curr->next();
+ curr->set_next(NULL);
+ curr->set_containing_set(NULL);
+ curr = next;
+ }
+ clear();
+
+ verify_optional();
+}
+
+void HeapRegionLinkedList::remove_all_pending(size_t target_count) {
+ hrl_assert_mt_safety_ok(this);
+ assert(target_count > 1, hrl_ext_msg(this, "pre-condition"));
+ assert(!is_empty(), hrl_ext_msg(this, "pre-condition"));
+
+ verify_optional();
+ DEBUG_ONLY(size_t old_length = length();)
+
+ HeapRegion* curr = _head;
+ HeapRegion* prev = NULL;
+ size_t count = 0;
+ while (curr != NULL) {
+ hrl_assert_region_ok(this, curr, this);
+ HeapRegion* next = curr->next();
+
+ if (curr->pending_removal()) {
+ assert(count < target_count,
+ hrl_err_msg("[%s] should not come across more regions "
+ "pending for removal than target_count: "SIZE_FORMAT,
+ name(), target_count));
+
+ if (prev == NULL) {
+ assert(_head == curr, hrl_ext_msg(this, "invariant"));
+ _head = next;
+ } else {
+ assert(_head != curr, hrl_ext_msg(this, "invariant"));
+ prev->set_next(next);
+ }
+ if (next == NULL) {
+ assert(_tail == curr, hrl_ext_msg(this, "invariant"));
+ _tail = prev;
+ } else {
+ assert(_tail != curr, hrl_ext_msg(this, "invariant"));
+ }
+
+ curr->set_next(NULL);
+ remove_internal(curr);
+ curr->set_pending_removal(false);
+
+ count += 1;
+
+ // If we have come across the target number of regions we can
+ // just bail out. However, for debugging purposes, we can just
+ // carry on iterating to make sure there are not more regions
+ // tagged with pending removal.
+ DEBUG_ONLY(if (count == target_count) break;)
+ } else {
+ prev = curr;
+ }
+ curr = next;
+ }
+
+ assert(count == target_count,
+ hrl_err_msg("[%s] count: "SIZE_FORMAT" should be == "
+ "target_count: "SIZE_FORMAT, name(), count, target_count));
+ assert(length() + target_count == old_length,
+ hrl_err_msg("[%s] new length should be consistent "
+ "new length: "SIZE_FORMAT" old length: "SIZE_FORMAT" "
+ "target_count: "SIZE_FORMAT,
+ name(), length(), old_length, target_count));
+
+ verify_optional();
+}
+
+void HeapRegionLinkedList::verify() {
+ // See comment in HeapRegionSetBase::verify() about MT safety and
+ // verification.
+ hrl_assert_mt_safety_ok(this);
+
+ // This will also do the basic verification too.
+ verify_start();
+
+ HeapRegion* curr = _head;
+ HeapRegion* prev1 = NULL;
+ HeapRegion* prev0 = NULL;
+ size_t count = 0;
+ while (curr != NULL) {
+ verify_next_region(curr);
+
+ count += 1;
+ guarantee(count < _unrealistically_long_length,
+ hrl_err_msg("[%s] the calculated length: "SIZE_FORMAT" "
+ "seems very long, is there maybe a cycle? "
+ "curr: "PTR_FORMAT" prev0: "PTR_FORMAT" "
+ "prev1: "PTR_FORMAT" length: "SIZE_FORMAT,
+ name(), count, curr, prev0, prev1, length()));
+
+ prev1 = prev0;
+ prev0 = curr;
+ curr = curr->next();
+ }
+
+ guarantee(_tail == prev0, hrl_ext_msg(this, "post-condition"));
+
+ verify_end();
+}
+
+void HeapRegionLinkedList::clear() {
+ HeapRegionSetBase::clear();
+ _head = NULL;
+ _tail = NULL;
+}
+
+void HeapRegionLinkedList::print_on(outputStream* out, bool print_contents) {
+ HeapRegionSetBase::print_on(out, print_contents);
+ out->print_cr(" Linking");
+ out->print_cr(" head : "PTR_FORMAT, _head);
+ out->print_cr(" tail : "PTR_FORMAT, _tail);
+
+ if (print_contents) {
+ out->print_cr(" Contents");
+ HeapRegionLinkedListIterator iter(this);
+ while (iter.more_available()) {
+ HeapRegion* hr = iter.get_next();
+ hr->print_on(out);
+ }
+ }
+}