Mercurial > hg > graal-compiler
view src/share/vm/gc_implementation/shared/vmGCOperations.cpp @ 2874:d90bf514d647
Renamed packages.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
---|---|
date | Wed, 08 Jun 2011 08:59:54 +0200 |
parents | c798c277ddd1 |
children | 436b4a3231bf |
line wrap: on
line source
/* * Copyright (c) 2005, 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 "classfile/classLoader.hpp" #include "classfile/javaClasses.hpp" #include "gc_implementation/shared/vmGCOperations.hpp" #include "memory/gcLocker.inline.hpp" #include "memory/genCollectedHeap.hpp" #include "memory/oopFactory.hpp" #include "oops/instanceKlass.hpp" #include "oops/instanceRefKlass.hpp" #include "runtime/handles.inline.hpp" #include "runtime/init.hpp" #include "runtime/interfaceSupport.hpp" #include "utilities/dtrace.hpp" #include "utilities/preserveException.hpp" #ifndef SERIALGC #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" #endif HS_DTRACE_PROBE_DECL1(hotspot, gc__begin, bool); HS_DTRACE_PROBE_DECL(hotspot, gc__end); // The same dtrace probe can't be inserted in two different files, so we // have to call it here, so it's only in one file. Can't create new probes // for the other file anymore. The dtrace probes have to remain stable. void VM_GC_Operation::notify_gc_begin(bool full) { HS_DTRACE_PROBE1(hotspot, gc__begin, full); HS_DTRACE_WORKAROUND_TAIL_CALL_BUG(); } void VM_GC_Operation::notify_gc_end() { HS_DTRACE_PROBE(hotspot, gc__end); HS_DTRACE_WORKAROUND_TAIL_CALL_BUG(); } void VM_GC_Operation::acquire_pending_list_lock() { // we may enter this with pending exception set instanceRefKlass::acquire_pending_list_lock(&_pending_list_basic_lock); } void VM_GC_Operation::release_and_notify_pending_list_lock() { instanceRefKlass::release_and_notify_pending_list_lock(&_pending_list_basic_lock); } // Allocations may fail in several threads at about the same time, // resulting in multiple gc requests. We only want to do one of them. // In case a GC locker is active and the need for a GC is already signalled, // we want to skip this GC attempt altogether, without doing a futile // safepoint operation. bool VM_GC_Operation::skip_operation() const { bool skip = (_gc_count_before != Universe::heap()->total_collections()); if (_full && skip) { skip = (_full_gc_count_before != Universe::heap()->total_full_collections()); } if (!skip && GC_locker::is_active_and_needs_gc()) { skip = Universe::heap()->is_maximal_no_gc(); assert(!(skip && (_gc_cause == GCCause::_gc_locker)), "GC_locker cannot be active when initiating GC"); } return skip; } bool VM_GC_Operation::doit_prologue() { assert(Thread::current()->is_Java_thread(), "just checking"); assert(((_gc_cause != GCCause::_no_gc) && (_gc_cause != GCCause::_no_cause_specified)), "Illegal GCCause"); acquire_pending_list_lock(); // If the GC count has changed someone beat us to the collection // Get the Heap_lock after the pending_list_lock. Heap_lock->lock(); // Check invocations if (skip_operation()) { // skip collection Heap_lock->unlock(); release_and_notify_pending_list_lock(); _prologue_succeeded = false; } else { _prologue_succeeded = true; SharedHeap* sh = SharedHeap::heap(); if (sh != NULL) sh->_thread_holds_heap_lock_for_gc = true; } return _prologue_succeeded; } void VM_GC_Operation::doit_epilogue() { assert(Thread::current()->is_Java_thread(), "just checking"); // Release the Heap_lock first. SharedHeap* sh = SharedHeap::heap(); if (sh != NULL) sh->_thread_holds_heap_lock_for_gc = false; Heap_lock->unlock(); release_and_notify_pending_list_lock(); } bool VM_GC_HeapInspection::doit_prologue() { if (Universe::heap()->supports_heap_inspection()) { return VM_GC_Operation::doit_prologue(); } else { return false; } } bool VM_GC_HeapInspection::skip_operation() const { assert(Universe::heap()->supports_heap_inspection(), "huh?"); return false; } void VM_GC_HeapInspection::doit() { HandleMark hm; CollectedHeap* ch = Universe::heap(); ch->ensure_parsability(false); // must happen, even if collection does // not happen (e.g. due to GC_locker) if (_full_gc) { // The collection attempt below would be skipped anyway if // the gc locker is held. The following dump may then be a tad // misleading to someone expecting only live objects to show // up in the dump (see CR 6944195). Just issue a suitable warning // in that case and do not attempt to do a collection. // The latter is a subtle point, because even a failed attempt // to GC will, in fact, induce one in the future, which we // probably want to avoid in this case because the GC that we may // be about to attempt holds value for us only // if it happens now and not if it happens in the eventual // future. if (GC_locker::is_active()) { warning("GC locker is held; pre-dump GC was skipped"); } else { ch->collect_as_vm_thread(GCCause::_heap_inspection); } } HeapInspection::heap_inspection(_out, _need_prologue /* need_prologue */); } void VM_GenCollectForAllocation::doit() { SvcGCMarker sgcm(SvcGCMarker::MINOR); GenCollectedHeap* gch = GenCollectedHeap::heap(); GCCauseSetter gccs(gch, _gc_cause); _res = gch->satisfy_failed_allocation(_size, _tlab); assert(gch->is_in_reserved_or_null(_res), "result not in heap"); if (_res == NULL && GC_locker::is_active_and_needs_gc()) { set_gc_locked(); } } void VM_GenCollectFull::doit() { SvcGCMarker sgcm(SvcGCMarker::FULL); GenCollectedHeap* gch = GenCollectedHeap::heap(); GCCauseSetter gccs(gch, _gc_cause); gch->do_full_collection(gch->must_clear_all_soft_refs(), _max_level); } void VM_GenCollectForPermanentAllocation::doit() { SvcGCMarker sgcm(SvcGCMarker::FULL); SharedHeap* heap = (SharedHeap*)Universe::heap(); GCCauseSetter gccs(heap, _gc_cause); switch (heap->kind()) { case (CollectedHeap::GenCollectedHeap): { GenCollectedHeap* gch = (GenCollectedHeap*)heap; gch->do_full_collection(gch->must_clear_all_soft_refs(), gch->n_gens() - 1); break; } #ifndef SERIALGC case (CollectedHeap::G1CollectedHeap): { G1CollectedHeap* g1h = (G1CollectedHeap*)heap; g1h->do_full_collection(_gc_cause == GCCause::_last_ditch_collection); break; } #endif // SERIALGC default: ShouldNotReachHere(); } _res = heap->perm_gen()->allocate(_size, false); assert(heap->is_in_reserved_or_null(_res), "result not in heap"); if (_res == NULL && GC_locker::is_active_and_needs_gc()) { set_gc_locked(); } }