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 */
24
25 # include "incls/_precompiled.incl"
26 # include "incls/_referencePolicy.cpp.incl"
27
28 LRUCurrentHeapPolicy::LRUCurrentHeapPolicy() {
29 _max_interval = (Universe::get_heap_free_at_last_gc() / M) * SoftRefLRUPolicyMSPerMB;
30 assert(_max_interval >= 0,"Sanity check");
31 }
32
33 // The oop passed in is the SoftReference object, and not
34 // the object the SoftReference points to.
35 bool LRUCurrentHeapPolicy::should_clear_reference(oop p) {
36 jlong interval = java_lang_ref_SoftReference::clock() - java_lang_ref_SoftReference::timestamp(p);
37 assert(interval >= 0, "Sanity check");
38
39 // The interval will be zero if the ref was accessed since the last scavenge/gc.
40 if(interval <= _max_interval) {
41 return false;
42 }
43
44 return true;
45 }
46
47 /////////////////////// MaxHeap //////////////////////
48
49 LRUMaxHeapPolicy::LRUMaxHeapPolicy() {
50 size_t max_heap = MaxHeapSize;
51 max_heap -= Universe::get_heap_used_at_last_gc();
52 max_heap /= M;
53
54 _max_interval = max_heap * SoftRefLRUPolicyMSPerMB;
55 assert(_max_interval >= 0,"Sanity check");
56 }
57
58 // The oop passed in is the SoftReference object, and not
59 // the object the SoftReference points to.
60 bool LRUMaxHeapPolicy::should_clear_reference(oop p) {
61 jlong interval = java_lang_ref_SoftReference::clock() - java_lang_ref_SoftReference::timestamp(p);
62 assert(interval >= 0, "Sanity check");
63
64 // The interval will be zero if the ref was accessed since the last scavenge/gc.
65 if(interval <= _max_interval) {
66 return false;
67 }
68
69 return true;
|
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 */
24
25 # include "incls/_precompiled.incl"
26 # include "incls/_referencePolicy.cpp.incl"
27
28 LRUCurrentHeapPolicy::LRUCurrentHeapPolicy() {
29 snap();
30 }
31
32 void LRUCurrentHeapPolicy::snap() {
33 _max_interval = (Universe::get_heap_free_at_last_gc() / M) * SoftRefLRUPolicyMSPerMB;
34 assert(_max_interval >= 0,"Sanity check");
35 }
36
37 // The oop passed in is the SoftReference object, and not
38 // the object the SoftReference points to.
39 bool LRUCurrentHeapPolicy::should_clear_reference(oop p) {
40 jlong interval = java_lang_ref_SoftReference::clock() - java_lang_ref_SoftReference::timestamp(p);
41 assert(interval >= 0, "Sanity check");
42
43 // The interval will be zero if the ref was accessed since the last scavenge/gc.
44 if(interval <= _max_interval) {
45 return false;
46 }
47
48 return true;
49 }
50
51 /////////////////////// MaxHeap //////////////////////
52
53 LRUMaxHeapPolicy::LRUMaxHeapPolicy() {
54 snap();
55 }
56
57 void LRUMaxHeapPolicy::snap() {
58 size_t max_heap = MaxHeapSize;
59 max_heap -= Universe::get_heap_used_at_last_gc();
60 max_heap /= M;
61
62 _max_interval = max_heap * SoftRefLRUPolicyMSPerMB;
63 assert(_max_interval >= 0,"Sanity check");
64 }
65
66 // The oop passed in is the SoftReference object, and not
67 // the object the SoftReference points to.
68 bool LRUMaxHeapPolicy::should_clear_reference(oop p) {
69 jlong interval = java_lang_ref_SoftReference::clock() - java_lang_ref_SoftReference::timestamp(p);
70 assert(interval >= 0, "Sanity check");
71
72 // The interval will be zero if the ref was accessed since the last scavenge/gc.
73 if(interval <= _max_interval) {
74 return false;
75 }
76
77 return true;
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