Mercurial > hg > graal-compiler
view src/share/vm/gc_implementation/g1/heapRegionSet.cpp @ 20274:a8137787acfe
8047821: G1 Does not use the save_marks functionality as intended
Summary: Rename save_marks to record_top_and_timestamp and remove som unused but related methods
Reviewed-by: stefank, ehelin
author | mgerdin |
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date | Thu, 26 Jun 2014 10:00:00 +0200 |
parents | 78bbf4d43a14 |
children | 52b4284cb496 6701abbc4441 |
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/* * Copyright (c) 2011, 2014, 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/heapRegionRemSet.hpp" #include "gc_implementation/g1/heapRegionSet.inline.hpp" PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC uint FreeRegionList::_unrealistically_long_length = 0; void HeapRegionSetBase::fill_in_ext_msg(hrs_ext_msg* msg, const char* message) { msg->append("[%s] %s ln: %u cy: "SIZE_FORMAT, name(), message, length(), total_capacity_bytes()); fill_in_ext_msg_extra(msg); } #ifndef PRODUCT void HeapRegionSetBase::verify_region(HeapRegion* hr) { assert(hr->containing_set() == this, err_msg("Inconsistent containing set for %u", hr->hrs_index())); assert(!hr->is_young(), err_msg("Adding young region %u", hr->hrs_index())); // currently we don't use these sets for young regions assert(hr->isHumongous() == regions_humongous(), err_msg("Wrong humongous state for region %u and set %s", hr->hrs_index(), name())); assert(hr->is_empty() == regions_empty(), err_msg("Wrong empty state for region %u and set %s", hr->hrs_index(), name())); assert(hr->rem_set()->verify_ready_for_par_iteration(), err_msg("Wrong iteration state %u", hr->hrs_index())); } #endif 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. check_mt_safety(); guarantee(( is_empty() && length() == 0 && total_capacity_bytes() == 0) || (!is_empty() && length() >= 0 && total_capacity_bytes() >= 0), hrs_ext_msg(this, "invariant")); } void HeapRegionSetBase::verify_start() { // See comment in verify() about MT safety and verification. check_mt_safety(); assert(!_verify_in_progress, hrs_ext_msg(this, "verification should not be in progress")); // Do the basic verification first before we do the checks over the regions. HeapRegionSetBase::verify(); _verify_in_progress = true; } void HeapRegionSetBase::verify_end() { // See comment in verify() about MT safety and verification. check_mt_safety(); assert(_verify_in_progress, hrs_ext_msg(this, "verification should be in progress")); _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 : %14u", length()); out->print_cr(" total capacity : "SIZE_FORMAT_W(14)" bytes", total_capacity_bytes()); } HeapRegionSetBase::HeapRegionSetBase(const char* name, bool humongous, bool empty, HRSMtSafeChecker* mt_safety_checker) : _name(name), _verify_in_progress(false), _is_humongous(humongous), _is_empty(empty), _mt_safety_checker(mt_safety_checker), _count() { } void FreeRegionList::set_unrealistically_long_length(uint len) { guarantee(_unrealistically_long_length == 0, "should only be set once"); _unrealistically_long_length = len; } void FreeRegionList::fill_in_ext_msg_extra(hrs_ext_msg* msg) { msg->append(" hd: "PTR_FORMAT" tl: "PTR_FORMAT, head(), tail()); } void FreeRegionList::add_as_head_or_tail(FreeRegionList* from_list, bool as_head) { check_mt_safety(); from_list->check_mt_safety(); verify_optional(); from_list->verify_optional(); if (from_list->is_empty()) { return; } #ifdef ASSERT FreeRegionListIterator 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 (_head == NULL) { assert(length() == 0 && _tail == NULL, hrs_ext_msg(this, "invariant")); _head = from_list->_head; _tail = from_list->_tail; } else { assert(length() > 0 && _tail != NULL, hrs_ext_msg(this, "invariant")); if (as_head) { from_list->_tail->set_next(_head); _head->set_prev(from_list->_tail); _head = from_list->_head; } else { _tail->set_next(from_list->_head); from_list->_head->set_prev(_tail); _tail = from_list->_tail; } } _count.increment(from_list->length(), from_list->total_capacity_bytes()); from_list->clear(); verify_optional(); from_list->verify_optional(); } void FreeRegionList::add_as_head(FreeRegionList* from_list) { add_as_head_or_tail(from_list, true /* as_head */); } void FreeRegionList::add_as_tail(FreeRegionList* from_list) { add_as_head_or_tail(from_list, false /* as_head */); } void FreeRegionList::remove_all() { check_mt_safety(); verify_optional(); HeapRegion* curr = _head; while (curr != NULL) { verify_region(curr); HeapRegion* next = curr->next(); curr->set_next(NULL); curr->set_prev(NULL); curr->set_containing_set(NULL); curr = next; } clear(); verify_optional(); } void FreeRegionList::add_ordered(FreeRegionList* from_list) { check_mt_safety(); from_list->check_mt_safety(); verify_optional(); from_list->verify_optional(); if (from_list->is_empty()) { return; } if (is_empty()) { add_as_head(from_list); return; } #ifdef ASSERT FreeRegionListIterator 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 HeapRegion* curr_to = _head; HeapRegion* curr_from = from_list->_head; while (curr_from != NULL) { while (curr_to != NULL && curr_to->hrs_index() < curr_from->hrs_index()) { curr_to = curr_to->next(); } if (curr_to == NULL) { // The rest of the from list should be added as tail _tail->set_next(curr_from); curr_from->set_prev(_tail); curr_from = NULL; } else { HeapRegion* next_from = curr_from->next(); curr_from->set_next(curr_to); curr_from->set_prev(curr_to->prev()); if (curr_to->prev() == NULL) { _head = curr_from; } else { curr_to->prev()->set_next(curr_from); } curr_to->set_prev(curr_from); curr_from = next_from; } } if (_tail->hrs_index() < from_list->_tail->hrs_index()) { _tail = from_list->_tail; } _count.increment(from_list->length(), from_list->total_capacity_bytes()); from_list->clear(); verify_optional(); from_list->verify_optional(); } void FreeRegionList::remove_all_pending(uint target_count) { check_mt_safety(); assert(target_count > 1, hrs_ext_msg(this, "pre-condition")); assert(!is_empty(), hrs_ext_msg(this, "pre-condition")); verify_optional(); DEBUG_ONLY(uint old_length = length();) HeapRegion* curr = _head; uint count = 0; while (curr != NULL) { verify_region(curr); HeapRegion* next = curr->next(); HeapRegion* prev = curr->prev(); if (curr->pending_removal()) { assert(count < target_count, hrs_err_msg("[%s] should not come across more regions " "pending for removal than target_count: %u", name(), target_count)); if (prev == NULL) { assert(_head == curr, hrs_ext_msg(this, "invariant")); _head = next; } else { assert(_head != curr, hrs_ext_msg(this, "invariant")); prev->set_next(next); } if (next == NULL) { assert(_tail == curr, hrs_ext_msg(this, "invariant")); _tail = prev; } else { assert(_tail != curr, hrs_ext_msg(this, "invariant")); next->set_prev(prev); } if (_last = curr) { _last = NULL; } curr->set_next(NULL); curr->set_prev(NULL); remove(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;) } curr = next; } assert(count == target_count, hrs_err_msg("[%s] count: %u should be == target_count: %u", name(), count, target_count)); assert(length() + target_count == old_length, hrs_err_msg("[%s] new length should be consistent " "new length: %u old length: %u target_count: %u", name(), length(), old_length, target_count)); verify_optional(); } void FreeRegionList::verify() { // See comment in HeapRegionSetBase::verify() about MT safety and // verification. check_mt_safety(); // This will also do the basic verification too. verify_start(); verify_list(); verify_end(); } void FreeRegionList::clear() { _count = HeapRegionSetCount(); _head = NULL; _tail = NULL; _last = NULL; } void FreeRegionList::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"); FreeRegionListIterator iter(this); while (iter.more_available()) { HeapRegion* hr = iter.get_next(); hr->print_on(out); } } } void FreeRegionList::verify_list() { HeapRegion* curr = head(); HeapRegion* prev1 = NULL; HeapRegion* prev0 = NULL; uint count = 0; size_t capacity = 0; uint last_index = 0; guarantee(_head == NULL || _head->prev() == NULL, "_head should not have a prev"); while (curr != NULL) { verify_region(curr); count++; guarantee(count < _unrealistically_long_length, 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())); if (curr->next() != NULL) { guarantee(curr->next()->prev() == curr, "Next or prev pointers messed up"); } guarantee(curr->hrs_index() == 0 || curr->hrs_index() > last_index, "List should be sorted"); last_index = curr->hrs_index(); capacity += curr->capacity(); prev1 = prev0; prev0 = curr; curr = curr->next(); } guarantee(tail() == prev0, err_msg("Expected %s to end with %u but it ended with %u.", name(), tail()->hrs_index(), prev0->hrs_index())); guarantee(_tail == NULL || _tail->next() == NULL, "_tail should not have a next"); guarantee(length() == count, err_msg("%s count mismatch. Expected %u, actual %u.", name(), length(), count)); guarantee(total_capacity_bytes() == capacity, err_msg("%s capacity mismatch. Expected " SIZE_FORMAT ", actual " SIZE_FORMAT, name(), total_capacity_bytes(), capacity)); } // Note on the check_mt_safety() methods below: // // Verification of the "master" heap region sets / lists that are // maintained by G1CollectedHeap is always done during a STW pause and // by the VM thread at the start / end of the pause. The standard // verification methods all assert check_mt_safety(). This is // important as it ensures that verification is done without // concurrent updates taking place at the same time. It follows, that, // for the "master" heap region sets / lists, the check_mt_safety() // method should include the VM thread / STW case. void MasterFreeRegionListMtSafeChecker::check() { // Master Free List MT safety protocol: // (a) If we're at a safepoint, operations on the master free list // should be invoked by either the VM thread (which will serialize // them) or by the GC workers while holding the // FreeList_lock. // (b) If we're not at a safepoint, operations on the master free // list should be invoked while holding the Heap_lock. if (SafepointSynchronize::is_at_safepoint()) { guarantee(Thread::current()->is_VM_thread() || FreeList_lock->owned_by_self(), "master free list MT safety protocol at a safepoint"); } else { guarantee(Heap_lock->owned_by_self(), "master free list MT safety protocol outside a safepoint"); } } void SecondaryFreeRegionListMtSafeChecker::check() { // Secondary Free List MT safety protocol: // Operations on the secondary free list should always be invoked // while holding the SecondaryFreeList_lock. guarantee(SecondaryFreeList_lock->owned_by_self(), "secondary free list MT safety protocol"); } void OldRegionSetMtSafeChecker::check() { // Master Old Set MT safety protocol: // (a) If we're at a safepoint, operations on the master old set // should be invoked: // - by the VM thread (which will serialize them), or // - by the GC workers while holding the FreeList_lock, if we're // at a safepoint for an evacuation pause (this lock is taken // anyway when an GC alloc region is retired so that a new one // is allocated from the free list), or // - by the GC workers while holding the OldSets_lock, if we're at a // safepoint for a cleanup pause. // (b) If we're not at a safepoint, operations on the master old set // should be invoked while holding the Heap_lock. if (SafepointSynchronize::is_at_safepoint()) { guarantee(Thread::current()->is_VM_thread() || FreeList_lock->owned_by_self() || OldSets_lock->owned_by_self(), "master old set MT safety protocol at a safepoint"); } else { guarantee(Heap_lock->owned_by_self(), "master old set MT safety protocol outside a safepoint"); } } void HumongousRegionSetMtSafeChecker::check() { // Humongous Set MT safety protocol: // (a) If we're at a safepoint, operations on the master humongous // set should be invoked by either the VM thread (which will // serialize them) or by the GC workers while holding the // OldSets_lock. // (b) If we're not at a safepoint, operations on the master // humongous set should be invoked while holding the Heap_lock. if (SafepointSynchronize::is_at_safepoint()) { guarantee(Thread::current()->is_VM_thread() || OldSets_lock->owned_by_self(), "master humongous set MT safety protocol at a safepoint"); } else { guarantee(Heap_lock->owned_by_self(), "master humongous set MT safety protocol outside a safepoint"); } }