jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/parallelScavenge/vmPSOperations.cpp@9f28a4cac6d9

8048556: Unnecessary GCLocker-initiated young GCs
Summary: Fixed recognition of unnecessary GCLocker collections.
Reviewed-by: pliden, tschatzl
Contributed-by: johnc@azul.com

     1 /*

     2  * Copyright (c) 2007, 2015, 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  */

    25 #include "precompiled.hpp"

    26 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.inline.hpp"

    27 #include "gc_implementation/parallelScavenge/psMarkSweep.hpp"

    28 #include "gc_implementation/parallelScavenge/psScavenge.hpp"

    29 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp"

    30 #include "gc_implementation/parallelScavenge/vmPSOperations.hpp"

    31 #include "memory/gcLocker.inline.hpp"

    32 #include "utilities/dtrace.hpp"

    34 // The following methods are used by the parallel scavenge collector

    35 VM_ParallelGCFailedAllocation::VM_ParallelGCFailedAllocation(size_t word_size,

    36                                                              uint gc_count) :

    37     VM_CollectForAllocation(word_size, gc_count, GCCause::_allocation_failure) {

    38   assert(word_size != 0, "An allocation should always be requested with this operation.");

    39 }

    41 void VM_ParallelGCFailedAllocation::doit() {

    42   SvcGCMarker sgcm(SvcGCMarker::MINOR);

    44   ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();

    45   assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "must be a ParallelScavengeHeap");

    47   GCCauseSetter gccs(heap, _gc_cause);

    48   _result = heap->failed_mem_allocate(_word_size);

    50   if (_result == NULL && GC_locker::is_active_and_needs_gc()) {

    51     set_gc_locked();

    52   }

    53 }

    55 static bool is_cause_full(GCCause::Cause cause) {

    56   return (cause != GCCause::_gc_locker) && (cause != GCCause::_wb_young_gc)

    57          DEBUG_ONLY(&& (cause != GCCause::_scavenge_alot));

    58 }

    60 // Only used for System.gc() calls

    61 VM_ParallelGCSystemGC::VM_ParallelGCSystemGC(uint gc_count,

    62                                              uint full_gc_count,

    63                                              GCCause::Cause gc_cause) :

    64   VM_GC_Operation(gc_count, gc_cause, full_gc_count, is_cause_full(gc_cause))

    65 {

    66 }

    68 void VM_ParallelGCSystemGC::doit() {

    69   SvcGCMarker sgcm(SvcGCMarker::FULL);

    71   ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();

    72   assert(heap->kind() == CollectedHeap::ParallelScavengeHeap,

    73     "must be a ParallelScavengeHeap");

    75   GCCauseSetter gccs(heap, _gc_cause);

    76   if (!_full) {

    77     // If (and only if) the scavenge fails, this will invoke a full gc.

    78     heap->invoke_scavenge();

    79   } else {

    80     heap->do_full_collection(false);

    81   }

    82 }

Mercurial > jdk8-mips64-public > hotspot / file revision

src/share/vm/gc_implementation/parallelScavenge/vmPSOperations.cpp@9f28a4cac6d9

src/share/vm/gc_implementation/parallelScavenge/vmPSOperations.cpp