1 /*
   2  * Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "gc/parallel/parallelScavengeHeap.inline.hpp"
  27 #include "gc/parallel/psScavenge.hpp"
  28 #include "gc/parallel/psVMOperations.hpp"
  29 #include "gc/shared/gcLocker.hpp"
  30 #include "utilities/dtrace.hpp"
  31 
  32 // The following methods are used by the parallel scavenge collector
  33 VM_ParallelGCFailedAllocation::VM_ParallelGCFailedAllocation(size_t word_size,
  34                                                              uint gc_count) :
  35     VM_CollectForAllocation(word_size, gc_count, GCCause::_allocation_failure) {
  36   assert(word_size != 0, "An allocation should always be requested with this operation.");
  37 }
  38 
  39 void VM_ParallelGCFailedAllocation::doit() {
  40   SvcGCMarker sgcm(SvcGCMarker::MINOR);
  41 
  42   ParallelScavengeHeap* heap = ParallelScavengeHeap::heap();
  43 
  44   GCCauseSetter gccs(heap, _gc_cause);
  45   _result = heap->failed_mem_allocate(_word_size);
  46 
  47   if (_result == NULL && GCLocker::is_active_and_needs_gc()) {
  48     set_gc_locked();
  49   }
  50 }
  51 
  52 static bool is_cause_full(GCCause::Cause cause) {
  53   return (cause != GCCause::_gc_locker) && (cause != GCCause::_wb_young_gc)
  54          DEBUG_ONLY(&& (cause != GCCause::_scavenge_alot));
  55 }
  56 
  57 // Only used for System.gc() calls
  58 VM_ParallelGCSystemGC::VM_ParallelGCSystemGC(uint gc_count,
  59                                              uint full_gc_count,
  60                                              GCCause::Cause gc_cause) :
  61   VM_GC_Operation(gc_count, gc_cause, full_gc_count, is_cause_full(gc_cause))
  62 {
  63 }
  64 
  65 void VM_ParallelGCSystemGC::doit() {
  66   SvcGCMarker sgcm(SvcGCMarker::FULL);
  67 
  68   ParallelScavengeHeap* heap = ParallelScavengeHeap::heap();
  69 
  70   GCCauseSetter gccs(heap, _gc_cause);
  71   if (!_full) {
  72     // If (and only if) the scavenge fails, this will invoke a full gc.
  73     heap->invoke_scavenge();
  74   } else {
  75     heap->do_full_collection(false);
  76   }
  77 }