author | drchase |
Fri, 09 May 2014 16:50:54 -0400 | |
changeset 24424 | 2658d7834c6e |
parent 23471 | ec9427262f0a |
child 26157 | 70eddb655686 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2011, 2014, 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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PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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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->set_prev(from_list->_tail); |
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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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from_list->_head->set_prev(_tail); |
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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_prev(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::add_ordered(FreeRegionList* from_list) { |
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check_mt_safety(); |
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from_list->check_mt_safety(); |
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186 |
|
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verify_optional(); |
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from_list->verify_optional(); |
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189 |
|
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if (from_list->is_empty()) { |
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191 |
return; |
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} |
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193 |
|
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if (is_empty()) { |
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add_as_head(from_list); |
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return; |
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} |
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198 |
|
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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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|
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HeapRegion* curr_to = _head; |
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HeapRegion* curr_from = from_list->_head; |
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|
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while (curr_from != NULL) { |
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while (curr_to != NULL && curr_to->hrs_index() < curr_from->hrs_index()) { |
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curr_to = curr_to->next(); |
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} |
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|
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if (curr_to == NULL) { |
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// The rest of the from list should be added as tail |
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_tail->set_next(curr_from); |
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curr_from->set_prev(_tail); |
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curr_from = NULL; |
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} else { |
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HeapRegion* next_from = curr_from->next(); |
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|
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curr_from->set_next(curr_to); |
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curr_from->set_prev(curr_to->prev()); |
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if (curr_to->prev() == NULL) { |
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_head = curr_from; |
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} else { |
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curr_to->prev()->set_next(curr_from); |
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} |
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curr_to->set_prev(curr_from); |
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|
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curr_from = next_from; |
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|
237 |
} |
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} |
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239 |
|
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if (_tail->hrs_index() < from_list->_tail->hrs_index()) { |
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_tail = from_list->_tail; |
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|
242 |
} |
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243 |
|
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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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|
246 |
|
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verify_optional(); |
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|
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from_list->verify_optional(); |
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|
249 |
} |
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void FreeRegionList::remove_all_pending(uint target_count) { |
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252 |
check_mt_safety(); |
8680 | 253 |
assert(target_count > 1, hrs_ext_msg(this, "pre-condition")); |
254 |
assert(!is_empty(), hrs_ext_msg(this, "pre-condition")); |
|
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|
256 |
verify_optional(); |
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DEBUG_ONLY(uint old_length = length();) |
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|
259 |
HeapRegion* curr = _head; |
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uint count = 0; |
7923 | 261 |
while (curr != NULL) { |
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verify_region(curr); |
7923 | 263 |
HeapRegion* next = curr->next(); |
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HeapRegion* prev = curr->prev(); |
7923 | 265 |
|
266 |
if (curr->pending_removal()) { |
|
267 |
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", |
7923 | 270 |
name(), target_count)); |
271 |
||
272 |
if (prev == NULL) { |
|
8680 | 273 |
assert(_head == curr, hrs_ext_msg(this, "invariant")); |
7923 | 274 |
_head = next; |
275 |
} else { |
|
8680 | 276 |
assert(_head != curr, hrs_ext_msg(this, "invariant")); |
7923 | 277 |
prev->set_next(next); |
278 |
} |
|
279 |
if (next == NULL) { |
|
8680 | 280 |
assert(_tail == curr, hrs_ext_msg(this, "invariant")); |
7923 | 281 |
_tail = prev; |
282 |
} else { |
|
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assert(_tail != curr, hrs_ext_msg(this, "invariant")); |
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next->set_prev(prev); |
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285 |
} |
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if (_last = curr) { |
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_last = NULL; |
7923 | 288 |
} |
289 |
||
290 |
curr->set_next(NULL); |
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curr->set_prev(NULL); |
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292 |
remove(curr); |
7923 | 293 |
curr->set_pending_removal(false); |
294 |
||
295 |
count += 1; |
|
296 |
||
297 |
// If we have come across the target number of regions we can |
|
298 |
// just bail out. However, for debugging purposes, we can just |
|
299 |
// carry on iterating to make sure there are not more regions |
|
300 |
// tagged with pending removal. |
|
301 |
DEBUG_ONLY(if (count == target_count) break;) |
|
302 |
} |
|
303 |
curr = next; |
|
304 |
} |
|
305 |
||
306 |
assert(count == target_count, |
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hrs_err_msg("[%s] count: %u should be == target_count: %u", |
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308 |
name(), count, target_count)); |
7923 | 309 |
assert(length() + target_count == old_length, |
8680 | 310 |
hrs_err_msg("[%s] new length should be consistent " |
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311 |
"new length: %u old length: %u target_count: %u", |
7923 | 312 |
name(), length(), old_length, target_count)); |
313 |
||
314 |
verify_optional(); |
|
315 |
} |
|
316 |
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317 |
void FreeRegionList::verify() { |
7923 | 318 |
// See comment in HeapRegionSetBase::verify() about MT safety and |
319 |
// verification. |
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320 |
check_mt_safety(); |
7923 | 321 |
|
322 |
// This will also do the basic verification too. |
|
323 |
verify_start(); |
|
324 |
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325 |
verify_list(); |
7923 | 326 |
|
327 |
verify_end(); |
|
328 |
} |
|
329 |
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330 |
void FreeRegionList::clear() { |
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331 |
_count = HeapRegionSetCount(); |
7923 | 332 |
_head = NULL; |
333 |
_tail = NULL; |
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334 |
_last = NULL; |
7923 | 335 |
} |
336 |
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337 |
void FreeRegionList::print_on(outputStream* out, bool print_contents) { |
7923 | 338 |
HeapRegionSetBase::print_on(out, print_contents); |
339 |
out->print_cr(" Linking"); |
|
340 |
out->print_cr(" head : "PTR_FORMAT, _head); |
|
341 |
out->print_cr(" tail : "PTR_FORMAT, _tail); |
|
342 |
||
343 |
if (print_contents) { |
|
344 |
out->print_cr(" Contents"); |
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345 |
FreeRegionListIterator iter(this); |
7923 | 346 |
while (iter.more_available()) { |
347 |
HeapRegion* hr = iter.get_next(); |
|
348 |
hr->print_on(out); |
|
349 |
} |
|
350 |
} |
|
351 |
} |
|
23459 | 352 |
|
353 |
void FreeRegionList::verify_list() { |
|
354 |
HeapRegion* curr = head(); |
|
355 |
HeapRegion* prev1 = NULL; |
|
356 |
HeapRegion* prev0 = NULL; |
|
357 |
uint count = 0; |
|
358 |
size_t capacity = 0; |
|
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359 |
uint last_index = 0; |
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360 |
|
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361 |
guarantee(_head == NULL || _head->prev() == NULL, "_head should not have a prev"); |
23459 | 362 |
while (curr != NULL) { |
363 |
verify_region(curr); |
|
364 |
||
365 |
count++; |
|
366 |
guarantee(count < _unrealistically_long_length, |
|
367 |
hrs_err_msg("[%s] the calculated length: %u seems very long, is there maybe a cycle? curr: "PTR_FORMAT" prev0: "PTR_FORMAT" " "prev1: "PTR_FORMAT" length: %u", name(), count, curr, prev0, prev1, length())); |
|
368 |
||
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369 |
if (curr->next() != NULL) { |
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370 |
guarantee(curr->next()->prev() == curr, "Next or prev pointers messed up"); |
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|
371 |
} |
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|
372 |
guarantee(curr->hrs_index() == 0 || curr->hrs_index() > last_index, "List should be sorted"); |
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373 |
last_index = curr->hrs_index(); |
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374 |
|
23459 | 375 |
capacity += curr->capacity(); |
376 |
||
377 |
prev1 = prev0; |
|
378 |
prev0 = curr; |
|
379 |
curr = curr->next(); |
|
380 |
} |
|
381 |
||
382 |
guarantee(tail() == prev0, err_msg("Expected %s to end with %u but it ended with %u.", name(), tail()->hrs_index(), prev0->hrs_index())); |
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23471
ec9427262f0a
8036025: Sort the freelist in order to shrink the heap
jwilhelm
parents:
23459
diff
changeset
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383 |
guarantee(_tail == NULL || _tail->next() == NULL, "_tail should not have a next"); |
23459 | 384 |
guarantee(length() == count, err_msg("%s count mismatch. Expected %u, actual %u.", name(), length(), count)); |
385 |
guarantee(total_capacity_bytes() == capacity, err_msg("%s capacity mismatch. Expected " SIZE_FORMAT ", actual " SIZE_FORMAT, |
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name(), total_capacity_bytes(), capacity)); |
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} |
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// Note on the check_mt_safety() methods below: |
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// |
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// Verification of the "master" heap region sets / lists that are |
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// maintained by G1CollectedHeap is always done during a STW pause and |
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// by the VM thread at the start / end of the pause. The standard |
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// verification methods all assert check_mt_safety(). This is |
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// important as it ensures that verification is done without |
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// concurrent updates taking place at the same time. It follows, that, |
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// for the "master" heap region sets / lists, the check_mt_safety() |
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// method should include the VM thread / STW case. |
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void MasterFreeRegionListMtSafeChecker::check() { |
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// Master Free List MT safety protocol: |
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// (a) If we're at a safepoint, operations on the master free list |
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// should be invoked by either the VM thread (which will serialize |
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// them) or by the GC workers while holding the |
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// FreeList_lock. |
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// (b) If we're not at a safepoint, operations on the master free |
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// list should be invoked while holding the Heap_lock. |
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if (SafepointSynchronize::is_at_safepoint()) { |
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guarantee(Thread::current()->is_VM_thread() || |
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FreeList_lock->owned_by_self(), "master free list MT safety protocol at a safepoint"); |
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} else { |
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guarantee(Heap_lock->owned_by_self(), "master free list MT safety protocol outside a safepoint"); |
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} |
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} |
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||
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void SecondaryFreeRegionListMtSafeChecker::check() { |
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// Secondary Free List MT safety protocol: |
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// Operations on the secondary free list should always be invoked |
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// while holding the SecondaryFreeList_lock. |
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guarantee(SecondaryFreeList_lock->owned_by_self(), "secondary free list MT safety protocol"); |
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} |
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void OldRegionSetMtSafeChecker::check() { |
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// Master Old Set MT safety protocol: |
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// (a) If we're at a safepoint, operations on the master old set |
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// should be invoked: |
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// - by the VM thread (which will serialize them), or |
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// - by the GC workers while holding the FreeList_lock, if we're |
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// at a safepoint for an evacuation pause (this lock is taken |
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// anyway when an GC alloc region is retired so that a new one |
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// is allocated from the free list), or |
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// - by the GC workers while holding the OldSets_lock, if we're at a |
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// safepoint for a cleanup pause. |
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// (b) If we're not at a safepoint, operations on the master old set |
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// should be invoked while holding the Heap_lock. |
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if (SafepointSynchronize::is_at_safepoint()) { |
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guarantee(Thread::current()->is_VM_thread() |
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|| FreeList_lock->owned_by_self() || OldSets_lock->owned_by_self(), |
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"master old set MT safety protocol at a safepoint"); |
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} else { |
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guarantee(Heap_lock->owned_by_self(), "master old set MT safety protocol outside a safepoint"); |
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} |
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} |
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||
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void HumongousRegionSetMtSafeChecker::check() { |
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// Humongous Set MT safety protocol: |
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// (a) If we're at a safepoint, operations on the master humongous |
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// set should be invoked by either the VM thread (which will |
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// serialize them) or by the GC workers while holding the |
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// OldSets_lock. |
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// (b) If we're not at a safepoint, operations on the master |
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// humongous set should be invoked while holding the Heap_lock. |
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if (SafepointSynchronize::is_at_safepoint()) { |
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guarantee(Thread::current()->is_VM_thread() || |
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OldSets_lock->owned_by_self(), |
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"master humongous set MT safety protocol at a safepoint"); |
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} else { |
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guarantee(Heap_lock->owned_by_self(), |
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"master humongous set MT safety protocol outside a safepoint"); |
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} |
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} |