jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/shared/isGCActiveMark.hpp@aaf61e68b255

6818524: G1: use ergonomic resizing of PLABs
Summary: Employ PLABStats instances to record information about survivor and old PLABs, and use the recorded stats to adjust the sizes of survivor and old PLABS.
Reviewed-by: johnc, ysr
Contributed-by: Brandon Mitchell <brandon@twitter.com>

     1 /*

     2  * Copyright (c) 2002, 2010, 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 #ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_ISGCACTIVEMARK_HPP

    26 #define SHARE_VM_GC_IMPLEMENTATION_SHARED_ISGCACTIVEMARK_HPP

    28 #ifndef SERIALGC

    29 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"

    30 #endif

    32 // This class provides a method for block structured setting of the

    33 // _is_gc_active state without requiring accessors in CollectedHeap

    35 class IsGCActiveMark : public StackObj {

    36  public:

    37   IsGCActiveMark() {

    38     CollectedHeap* heap = Universe::heap();

    39     assert(!heap->is_gc_active(), "Not reentrant");

    40     heap->_is_gc_active = true;

    41   }

    43   ~IsGCActiveMark() {

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

    45     assert(heap->is_gc_active(), "Sanity");

    46     heap->_is_gc_active = false;

    47   }

    48 };

    50 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_ISGCACTIVEMARK_HPP

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

src/share/vm/gc_implementation/shared/isGCActiveMark.hpp@aaf61e68b255

src/share/vm/gc_implementation/shared/isGCActiveMark.hpp