| /* |
| * Copyright 2005-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| * |
| */ |
| # include "incls/_precompiled.incl" |
| # include "incls/_vmGCOperations.cpp.incl" |
| |
| 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); |
| } |
| |
| void VM_GC_Operation::notify_gc_end() { |
| HS_DTRACE_PROBE(hotspot, gc__end); |
| } |
| |
| 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"); |
| |
| 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; |
| } |
| return _prologue_succeeded; |
| } |
| |
| |
| void VM_GC_Operation::doit_epilogue() { |
| assert(Thread::current()->is_Java_thread(), "just checking"); |
| // Release the Heap_lock first. |
| 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(); |
| if (_full_gc) { |
| ch->collect_as_vm_thread(GCCause::_heap_inspection); |
| } else { |
| // make the heap parsable (no need to retire TLABs) |
| ch->ensure_parsability(false); |
| } |
| HeapInspection::heap_inspection(_out); |
| } |
| |
| |
| void VM_GenCollectForAllocation::doit() { |
| JvmtiGCForAllocationMarker jgcm; |
| notify_gc_begin(false); |
| |
| 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(); |
| } |
| notify_gc_end(); |
| } |
| |
| void VM_GenCollectFull::doit() { |
| JvmtiGCFullMarker jgcm; |
| notify_gc_begin(true); |
| |
| GenCollectedHeap* gch = GenCollectedHeap::heap(); |
| GCCauseSetter gccs(gch, _gc_cause); |
| gch->do_full_collection(gch->must_clear_all_soft_refs(), _max_level); |
| notify_gc_end(); |
| } |