Mercurial > hg > graal-compiler
view src/share/vm/gc_implementation/shared/vmGCOperations.cpp @ 665:c89f86385056
6814659: separable cleanups and subroutines for 6655638
Summary: preparatory but separable changes for method handles
Reviewed-by: kvn, never
author | jrose |
---|---|
date | Fri, 20 Mar 2009 23:19:36 -0700 |
parents | c6c601a0f2d6 |
children | bdb5361c461c |
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/* * Copyright 2005-2008 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; 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(); 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, _need_prologue /* need_prologue */); } 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(); } void VM_GenCollectForPermanentAllocation::doit() { JvmtiGCForAllocationMarker jgcm; notify_gc_begin(true); 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(); } notify_gc_end(); }