c88e3def4d
Reviewed-by: tschatzl, pliden
275 lines
8.9 KiB
C++
275 lines
8.9 KiB
C++
/*
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* Copyright (c) 2011, 2012, 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_implementation/g1/heapRegionRemSet.hpp"
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#include "gc_implementation/g1/heapRegionSet.inline.hpp"
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uint FreeRegionList::_unrealistically_long_length = 0;
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void HeapRegionSetBase::fill_in_ext_msg(hrs_ext_msg* msg, const char* message) {
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msg->append("[%s] %s ln: %u cy: "SIZE_FORMAT,
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name(), message, length(), total_capacity_bytes());
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fill_in_ext_msg_extra(msg);
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}
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#ifndef PRODUCT
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void HeapRegionSetBase::verify_region(HeapRegion* hr) {
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assert(hr->containing_set() == this, err_msg("Inconsistent containing set for %u", hr->hrs_index()));
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assert(!hr->is_young(), err_msg("Adding young region %u", hr->hrs_index())); // currently we don't use these sets for young regions
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assert(hr->isHumongous() == regions_humongous(), err_msg("Wrong humongous state for region %u and set %s", hr->hrs_index(), name()));
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assert(hr->is_empty() == regions_empty(), err_msg("Wrong empty state for region %u and set %s", hr->hrs_index(), name()));
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assert(hr->rem_set()->verify_ready_for_par_iteration(), err_msg("Wrong iteration state %u", hr->hrs_index()));
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}
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#endif
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void HeapRegionSetBase::verify() {
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// It's important that we also observe the MT safety protocol even
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// for the verification calls. If we do verification without the
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// appropriate locks and the set changes underneath our feet
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// verification might fail and send us on a wild goose chase.
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check_mt_safety();
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guarantee(( is_empty() && length() == 0 && total_capacity_bytes() == 0) ||
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(!is_empty() && length() >= 0 && total_capacity_bytes() >= 0),
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hrs_ext_msg(this, "invariant"));
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}
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void HeapRegionSetBase::verify_start() {
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// See comment in verify() about MT safety and verification.
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check_mt_safety();
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assert(!_verify_in_progress,
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hrs_ext_msg(this, "verification should not be in progress"));
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// Do the basic verification first before we do the checks over the regions.
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HeapRegionSetBase::verify();
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_verify_in_progress = true;
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}
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void HeapRegionSetBase::verify_end() {
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// See comment in verify() about MT safety and verification.
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check_mt_safety();
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assert(_verify_in_progress,
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hrs_ext_msg(this, "verification should be in progress"));
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_verify_in_progress = false;
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}
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void HeapRegionSetBase::print_on(outputStream* out, bool print_contents) {
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out->cr();
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out->print_cr("Set: %s ("PTR_FORMAT")", name(), this);
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out->print_cr(" Region Assumptions");
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out->print_cr(" humongous : %s", BOOL_TO_STR(regions_humongous()));
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out->print_cr(" empty : %s", BOOL_TO_STR(regions_empty()));
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out->print_cr(" Attributes");
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out->print_cr(" length : %14u", length());
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out->print_cr(" total capacity : "SIZE_FORMAT_W(14)" bytes",
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total_capacity_bytes());
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}
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HeapRegionSetBase::HeapRegionSetBase(const char* name, bool humongous, bool empty, HRSMtSafeChecker* mt_safety_checker)
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: _name(name), _verify_in_progress(false),
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_is_humongous(humongous), _is_empty(empty), _mt_safety_checker(mt_safety_checker),
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_count()
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{ }
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void FreeRegionList::set_unrealistically_long_length(uint len) {
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guarantee(_unrealistically_long_length == 0, "should only be set once");
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_unrealistically_long_length = len;
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}
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void FreeRegionList::fill_in_ext_msg_extra(hrs_ext_msg* msg) {
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msg->append(" hd: "PTR_FORMAT" tl: "PTR_FORMAT, head(), tail());
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}
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void FreeRegionList::add_as_head_or_tail(FreeRegionList* from_list, bool as_head) {
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check_mt_safety();
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from_list->check_mt_safety();
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verify_optional();
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from_list->verify_optional();
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if (from_list->is_empty()) {
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return;
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}
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#ifdef ASSERT
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FreeRegionListIterator iter(from_list);
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while (iter.more_available()) {
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HeapRegion* hr = iter.get_next();
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// In set_containing_set() we check that we either set the value
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// from NULL to non-NULL or vice versa to catch bugs. So, we have
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// to NULL it first before setting it to the value.
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hr->set_containing_set(NULL);
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hr->set_containing_set(this);
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}
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#endif // ASSERT
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if (_head == NULL) {
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assert(length() == 0 && _tail == NULL, hrs_ext_msg(this, "invariant"));
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_head = from_list->_head;
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_tail = from_list->_tail;
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} else {
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assert(length() > 0 && _tail != NULL, hrs_ext_msg(this, "invariant"));
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if (as_head) {
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from_list->_tail->set_next(_head);
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_head = from_list->_head;
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} else {
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_tail->set_next(from_list->_head);
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_tail = from_list->_tail;
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}
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}
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_count.increment(from_list->length(), from_list->total_capacity_bytes());
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from_list->clear();
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verify_optional();
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from_list->verify_optional();
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}
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void FreeRegionList::add_as_head(FreeRegionList* from_list) {
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add_as_head_or_tail(from_list, true /* as_head */);
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}
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void FreeRegionList::add_as_tail(FreeRegionList* from_list) {
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add_as_head_or_tail(from_list, false /* as_head */);
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}
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void FreeRegionList::remove_all() {
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check_mt_safety();
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verify_optional();
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HeapRegion* curr = _head;
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while (curr != NULL) {
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verify_region(curr);
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HeapRegion* next = curr->next();
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curr->set_next(NULL);
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curr->set_containing_set(NULL);
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curr = next;
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}
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clear();
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verify_optional();
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}
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void FreeRegionList::remove_all_pending(uint target_count) {
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check_mt_safety();
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assert(target_count > 1, hrs_ext_msg(this, "pre-condition"));
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assert(!is_empty(), hrs_ext_msg(this, "pre-condition"));
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verify_optional();
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DEBUG_ONLY(uint old_length = length();)
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HeapRegion* curr = _head;
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HeapRegion* prev = NULL;
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uint count = 0;
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while (curr != NULL) {
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verify_region(curr);
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HeapRegion* next = curr->next();
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if (curr->pending_removal()) {
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assert(count < target_count,
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hrs_err_msg("[%s] should not come across more regions "
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"pending for removal than target_count: %u",
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name(), target_count));
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if (prev == NULL) {
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assert(_head == curr, hrs_ext_msg(this, "invariant"));
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_head = next;
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} else {
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assert(_head != curr, hrs_ext_msg(this, "invariant"));
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prev->set_next(next);
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}
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if (next == NULL) {
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assert(_tail == curr, hrs_ext_msg(this, "invariant"));
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_tail = prev;
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} else {
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assert(_tail != curr, hrs_ext_msg(this, "invariant"));
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}
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curr->set_next(NULL);
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remove(curr);
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curr->set_pending_removal(false);
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count += 1;
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// If we have come across the target number of regions we can
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// just bail out. However, for debugging purposes, we can just
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// carry on iterating to make sure there are not more regions
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// tagged with pending removal.
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DEBUG_ONLY(if (count == target_count) break;)
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} else {
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prev = curr;
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}
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curr = next;
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}
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assert(count == target_count,
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hrs_err_msg("[%s] count: %u should be == target_count: %u",
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name(), count, target_count));
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assert(length() + target_count == old_length,
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hrs_err_msg("[%s] new length should be consistent "
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"new length: %u old length: %u target_count: %u",
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name(), length(), old_length, target_count));
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verify_optional();
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}
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void FreeRegionList::verify() {
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// See comment in HeapRegionSetBase::verify() about MT safety and
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// verification.
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check_mt_safety();
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// This will also do the basic verification too.
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verify_start();
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verify_list();
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verify_end();
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}
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void FreeRegionList::clear() {
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_count = HeapRegionSetCount();
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_head = NULL;
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_tail = NULL;
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}
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void FreeRegionList::print_on(outputStream* out, bool print_contents) {
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HeapRegionSetBase::print_on(out, print_contents);
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out->print_cr(" Linking");
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out->print_cr(" head : "PTR_FORMAT, _head);
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out->print_cr(" tail : "PTR_FORMAT, _tail);
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if (print_contents) {
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out->print_cr(" Contents");
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FreeRegionListIterator iter(this);
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while (iter.more_available()) {
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HeapRegion* hr = iter.get_next();
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hr->print_on(out);
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}
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}
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}
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