diff -r cb913d743d09 -r 0fa27f37d4d4 src/share/vm/gc_implementation/g1/heapRegionSet.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/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); + } + } +}