jdk8-mips64-public/hotspot: src/share/vm/memory/referencePolicy.cpp@f258c5828eb8

8011773: Some tests on Interned String crashed JVM with OOM
Summary: Instead of terminating the VM, throw OutOfMemoryError exceptions.
Reviewed-by: coleenp, dholmes

     1 /*

     2  * Copyright (c) 2000, 2011, 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

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    22  *

    23  */

    25 #include "precompiled.hpp"

    26 #include "classfile/javaClasses.hpp"

    27 #include "memory/referencePolicy.hpp"

    28 #include "memory/universe.hpp"

    29 #include "runtime/arguments.hpp"

    30 #include "runtime/globals.hpp"

    32 LRUCurrentHeapPolicy::LRUCurrentHeapPolicy() {

    33   setup();

    34 }

    36 // Capture state (of-the-VM) information needed to evaluate the policy

    37 void LRUCurrentHeapPolicy::setup() {

    38   _max_interval = (Universe::get_heap_free_at_last_gc() / M) * SoftRefLRUPolicyMSPerMB;

    39   assert(_max_interval >= 0,"Sanity check");

    40 }

    42 // The oop passed in is the SoftReference object, and not

    43 // the object the SoftReference points to.

    44 bool LRUCurrentHeapPolicy::should_clear_reference(oop p,

    45                                                   jlong timestamp_clock) {

    46   jlong interval = timestamp_clock - java_lang_ref_SoftReference::timestamp(p);

    47   assert(interval >= 0, "Sanity check");

    49   // The interval will be zero if the ref was accessed since the last scavenge/gc.

    50   if(interval <= _max_interval) {

    51     return false;

    52   }

    54   return true;

    55 }

    57 /////////////////////// MaxHeap //////////////////////

    59 LRUMaxHeapPolicy::LRUMaxHeapPolicy() {

    60   setup();

    61 }

    63 // Capture state (of-the-VM) information needed to evaluate the policy

    64 void LRUMaxHeapPolicy::setup() {

    65   size_t max_heap = MaxHeapSize;

    66   max_heap -= Universe::get_heap_used_at_last_gc();

    67   max_heap /= M;

    69   _max_interval = max_heap * SoftRefLRUPolicyMSPerMB;

    70   assert(_max_interval >= 0,"Sanity check");

    71 }

    73 // The oop passed in is the SoftReference object, and not

    74 // the object the SoftReference points to.

    75 bool LRUMaxHeapPolicy::should_clear_reference(oop p,

    76                                              jlong timestamp_clock) {

    77   jlong interval = timestamp_clock - java_lang_ref_SoftReference::timestamp(p);

    78   assert(interval >= 0, "Sanity check");

    80   // The interval will be zero if the ref was accessed since the last scavenge/gc.

    81   if(interval <= _max_interval) {

    82     return false;

    83   }

    85   return true;

    86 }

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

src/share/vm/memory/referencePolicy.cpp@f258c5828eb8

src/share/vm/memory/referencePolicy.cpp