Mercurial > hg > truffle
view src/share/vm/gc_implementation/shared/vmGCOperations.cpp @ 13907:6fc05ad86490
Remove unused 'negated' arguments.
author | Roland Schatz <roland.schatz@oracle.com> |
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date | Fri, 07 Feb 2014 15:03:21 +0100 |
parents | bf9e50c573ad |
children | a3ba776d6ab6 63a4eb8bcd23 9c3dc501b5eb |
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/* * Copyright (c) 2005, 2013, 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" #include "utilities/macros.hpp" #if INCLUDE_ALL_GCS #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" #endif // INCLUDE_ALL_GCS #ifndef USDT2 HS_DTRACE_PROBE_DECL1(hotspot, gc__begin, bool); HS_DTRACE_PROBE_DECL(hotspot, gc__end); #endif /* !USDT2 */ // 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) { #ifndef USDT2 HS_DTRACE_PROBE1(hotspot, gc__begin, full); HS_DTRACE_WORKAROUND_TAIL_CALL_BUG(); #else /* USDT2 */ HOTSPOT_GC_BEGIN( full); #endif /* USDT2 */ } void VM_GC_Operation::notify_gc_end() { #ifndef USDT2 HS_DTRACE_PROBE(hotspot, gc__end); HS_DTRACE_WORKAROUND_TAIL_CALL_BUG(); #else /* USDT2 */ HOTSPOT_GC_END( ); #endif /* USDT2 */ } 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; } bool VM_GC_HeapInspection::collect() { if (GC_locker::is_active()) { return false; } Universe::heap()->collect_as_vm_thread(GCCause::_heap_inspection); return true; } void VM_GC_HeapInspection::doit() { HandleMark hm; Universe::heap()->ensure_parsability(false); // must happen, even if collection does // not happen (e.g. due to GC_locker) // or _full_gc being false if (_full_gc) { if (!collect()) { // The collection attempt was skipped because 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. warning("GC locker is held; pre-dump GC was skipped"); } } HeapInspection inspect(_csv_format, _print_help, _print_class_stats, _columns); inspect.heap_inspection(_out); } 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_CollectForMetadataAllocation::doit() { SvcGCMarker sgcm(SvcGCMarker::FULL); CollectedHeap* heap = Universe::heap(); GCCauseSetter gccs(heap, _gc_cause); // Check again if the space is available. Another thread // may have similarly failed a metadata allocation and induced // a GC that freed space for the allocation. if (!MetadataAllocationFailALot) { _result = _loader_data->metaspace_non_null()->allocate(_size, _mdtype); } if (_result == NULL) { if (UseConcMarkSweepGC) { if (CMSClassUnloadingEnabled) { MetaspaceGC::set_should_concurrent_collect(true); } // For CMS expand since the collection is going to be concurrent. _result = _loader_data->metaspace_non_null()->expand_and_allocate(_size, _mdtype); } if (_result == NULL) { // Don't clear the soft refs yet. if (Verbose && PrintGCDetails && UseConcMarkSweepGC) { gclog_or_tty->print_cr("\nCMS full GC for Metaspace"); } heap->collect_as_vm_thread(GCCause::_metadata_GC_threshold); // After a GC try to allocate without expanding. Could fail // and expansion will be tried below. _result = _loader_data->metaspace_non_null()->allocate(_size, _mdtype); } if (_result == NULL) { // If still failing, allow the Metaspace to expand. // See delta_capacity_until_GC() for explanation of the // amount of the expansion. // This should work unless there really is no more space // or a MaxMetaspaceSize has been specified on the command line. _result = _loader_data->metaspace_non_null()->expand_and_allocate(_size, _mdtype); if (_result == NULL) { // If expansion failed, do a last-ditch collection and try allocating // again. A last-ditch collection will clear softrefs. This // behavior is similar to the last-ditch collection done for perm // gen when it was full and a collection for failed allocation // did not free perm gen space. heap->collect_as_vm_thread(GCCause::_last_ditch_collection); _result = _loader_data->metaspace_non_null()->allocate(_size, _mdtype); } } if (Verbose && PrintGCDetails && _result == NULL) { gclog_or_tty->print_cr("\nAfter Metaspace GC failed to allocate size " SIZE_FORMAT, _size); } } if (_result == NULL && GC_locker::is_active_and_needs_gc()) { set_gc_locked(); } }