jdk8-mips64-public/hotspot: src/share/vm/memory/referencePolicy.cpp@981375ca07b7

     1 /*

     2  * Copyright 2000-2008 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    25 # include "incls/_precompiled.incl"

    26 # include "incls/_referencePolicy.cpp.incl"

    28 LRUCurrentHeapPolicy::LRUCurrentHeapPolicy() {

    29   setup();

    30 }

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

    33 void LRUCurrentHeapPolicy::setup() {

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

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

    36 }

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

    39 // the object the SoftReference points to.

    40 bool LRUCurrentHeapPolicy::should_clear_reference(oop p) {

    41   jlong interval = java_lang_ref_SoftReference::clock() - java_lang_ref_SoftReference::timestamp(p);

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

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

    45   if(interval <= _max_interval) {

    46     return false;

    47   }

    49   return true;

    50 }

    52 /////////////////////// MaxHeap //////////////////////

    54 LRUMaxHeapPolicy::LRUMaxHeapPolicy() {

    55   setup();

    56 }

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

    59 void LRUMaxHeapPolicy::setup() {

    60   size_t max_heap = MaxHeapSize;

    61   max_heap -= Universe::get_heap_used_at_last_gc();

    62   max_heap /= M;

    64   _max_interval = max_heap * SoftRefLRUPolicyMSPerMB;

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

    66 }

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

    69 // the object the SoftReference points to.

    70 bool LRUMaxHeapPolicy::should_clear_reference(oop p) {

    71   jlong interval = java_lang_ref_SoftReference::clock() - java_lang_ref_SoftReference::timestamp(p);

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

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

    75   if(interval <= _max_interval) {

    76     return false;

    77   }

    79   return true;

    80 }

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