truffle: src/share/vm/memory/referencePolicy.hpp annotate

annotate src/share/vm/memory/referencePolicy.hpp @ 20543:e7d0505c8a30

8059758: Footprint regressions with JDK-8038423 Summary: Changes in JDK-8038423 always initialize (zero out) virtual memory used for auxiliary data structures. This causes a footprint regression for G1 in startup benchmarks. This is because they do not touch that memory at all, so the operating system does not actually commit these pages. The fix is to, if the initialization value of the data structures matches the default value of just committed memory (=0), do not do anything. Reviewed-by: jwilhelm, brutisso

author	tschatzl
date	Fri, 10 Oct 2014 15:51:58 +0200
parents	b9a9ed0f8eeb
children

rev	line source
0 a61af66fc99e Initial load duke parents: diff changeset	1 /*
6842 b9a9ed0f8eeb 7197424: update copyright year to match last edit in jdk8 hotspot repository mikael parents: 6197 diff changeset	2 * Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved.
0 a61af66fc99e Initial load duke parents: diff changeset	3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
a61af66fc99e Initial load duke parents: diff changeset	4 *
a61af66fc99e Initial load duke parents: diff changeset	5 * This code is free software; you can redistribute it and/or modify it
a61af66fc99e Initial load duke parents: diff changeset	6 * under the terms of the GNU General Public License version 2 only, as
a61af66fc99e Initial load duke parents: diff changeset	7 * published by the Free Software Foundation.
a61af66fc99e Initial load duke parents: diff changeset	8 *
a61af66fc99e Initial load duke parents: diff changeset	9 * This code is distributed in the hope that it will be useful, but WITHOUT
a61af66fc99e Initial load duke parents: diff changeset	10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
a61af66fc99e Initial load duke parents: diff changeset	11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
a61af66fc99e Initial load duke parents: diff changeset	12 * version 2 for more details (a copy is included in the LICENSE file that
a61af66fc99e Initial load duke parents: diff changeset	13 * accompanied this code).
a61af66fc99e Initial load duke parents: diff changeset	14 *
a61af66fc99e Initial load duke parents: diff changeset	15 * You should have received a copy of the GNU General Public License version
a61af66fc99e Initial load duke parents: diff changeset	16 * 2 along with this work; if not, write to the Free Software Foundation,
a61af66fc99e Initial load duke parents: diff changeset	17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
a61af66fc99e Initial load duke parents: diff changeset	18 *
1552 c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories trims parents: 470 diff changeset	19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories trims parents: 470 diff changeset	20 * or visit www.oracle.com if you need additional information or have any
c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories trims parents: 470 diff changeset	21 * questions.
0 a61af66fc99e Initial load duke parents: diff changeset	22 *
a61af66fc99e Initial load duke parents: diff changeset	23 */
a61af66fc99e Initial load duke parents: diff changeset	24
1972 f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1552 diff changeset	25 #ifndef SHARE_VM_MEMORY_REFERENCEPOLICY_HPP
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1552 diff changeset	26 #define SHARE_VM_MEMORY_REFERENCEPOLICY_HPP
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1552 diff changeset	27
0 a61af66fc99e Initial load duke parents: diff changeset	28 // referencePolicy is used to determine when soft reference objects
a61af66fc99e Initial load duke parents: diff changeset	29 // should be cleared.
a61af66fc99e Initial load duke parents: diff changeset	30
a61af66fc99e Initial load duke parents: diff changeset	31
6197 d2a62e0f25eb 6995781: Native Memory Tracking (Phase 1) zgu parents: 3992 diff changeset	32 class ReferencePolicy : public CHeapObj<mtGC> {
0 a61af66fc99e Initial load duke parents: diff changeset	33 public:
3992 d1bdeef3e3e2 7098282: G1: assert(interval >= 0) failed: Sanity check, referencePolicy.cpp: 76 johnc parents: 1972 diff changeset	34 virtual bool should_clear_reference(oop p, jlong timestamp_clock) {
d1bdeef3e3e2 7098282: G1: assert(interval >= 0) failed: Sanity check, referencePolicy.cpp: 76 johnc parents: 1972 diff changeset	35 ShouldNotReachHere();
d1bdeef3e3e2 7098282: G1: assert(interval >= 0) failed: Sanity check, referencePolicy.cpp: 76 johnc parents: 1972 diff changeset	36 return true;
d1bdeef3e3e2 7098282: G1: assert(interval >= 0) failed: Sanity check, referencePolicy.cpp: 76 johnc parents: 1972 diff changeset	37 }
d1bdeef3e3e2 7098282: G1: assert(interval >= 0) failed: Sanity check, referencePolicy.cpp: 76 johnc parents: 1972 diff changeset	38
453 c96030fff130 6684579: SoftReference processing can be made more efficient ysr parents: 0 diff changeset	39 // Capture state (of-the-VM) information needed to evaluate the policy
457 27a80744a83b 6778647: snap(), snap_policy() should be renamed setup(), setup_policy() ysr parents: 453 diff changeset	40 virtual void setup() { /* do nothing */ }
0 a61af66fc99e Initial load duke parents: diff changeset	41 };
a61af66fc99e Initial load duke parents: diff changeset	42
a61af66fc99e Initial load duke parents: diff changeset	43 class NeverClearPolicy : public ReferencePolicy {
a61af66fc99e Initial load duke parents: diff changeset	44 public:
3992 d1bdeef3e3e2 7098282: G1: assert(interval >= 0) failed: Sanity check, referencePolicy.cpp: 76 johnc parents: 1972 diff changeset	45 virtual bool should_clear_reference(oop p, jlong timestamp_clock) {
d1bdeef3e3e2 7098282: G1: assert(interval >= 0) failed: Sanity check, referencePolicy.cpp: 76 johnc parents: 1972 diff changeset	46 return false;
d1bdeef3e3e2 7098282: G1: assert(interval >= 0) failed: Sanity check, referencePolicy.cpp: 76 johnc parents: 1972 diff changeset	47 }
0 a61af66fc99e Initial load duke parents: diff changeset	48 };
a61af66fc99e Initial load duke parents: diff changeset	49
a61af66fc99e Initial load duke parents: diff changeset	50 class AlwaysClearPolicy : public ReferencePolicy {
a61af66fc99e Initial load duke parents: diff changeset	51 public:
3992 d1bdeef3e3e2 7098282: G1: assert(interval >= 0) failed: Sanity check, referencePolicy.cpp: 76 johnc parents: 1972 diff changeset	52 virtual bool should_clear_reference(oop p, jlong timestamp_clock) {
d1bdeef3e3e2 7098282: G1: assert(interval >= 0) failed: Sanity check, referencePolicy.cpp: 76 johnc parents: 1972 diff changeset	53 return true;
d1bdeef3e3e2 7098282: G1: assert(interval >= 0) failed: Sanity check, referencePolicy.cpp: 76 johnc parents: 1972 diff changeset	54 }
0 a61af66fc99e Initial load duke parents: diff changeset	55 };
a61af66fc99e Initial load duke parents: diff changeset	56
a61af66fc99e Initial load duke parents: diff changeset	57 class LRUCurrentHeapPolicy : public ReferencePolicy {
a61af66fc99e Initial load duke parents: diff changeset	58 private:
a61af66fc99e Initial load duke parents: diff changeset	59 jlong _max_interval;
a61af66fc99e Initial load duke parents: diff changeset	60
a61af66fc99e Initial load duke parents: diff changeset	61 public:
a61af66fc99e Initial load duke parents: diff changeset	62 LRUCurrentHeapPolicy();
a61af66fc99e Initial load duke parents: diff changeset	63
453 c96030fff130 6684579: SoftReference processing can be made more efficient ysr parents: 0 diff changeset	64 // Capture state (of-the-VM) information needed to evaluate the policy
457 27a80744a83b 6778647: snap(), snap_policy() should be renamed setup(), setup_policy() ysr parents: 453 diff changeset	65 void setup();
3992 d1bdeef3e3e2 7098282: G1: assert(interval >= 0) failed: Sanity check, referencePolicy.cpp: 76 johnc parents: 1972 diff changeset	66 virtual bool should_clear_reference(oop p, jlong timestamp_clock);
0 a61af66fc99e Initial load duke parents: diff changeset	67 };
a61af66fc99e Initial load duke parents: diff changeset	68
a61af66fc99e Initial load duke parents: diff changeset	69 class LRUMaxHeapPolicy : public ReferencePolicy {
a61af66fc99e Initial load duke parents: diff changeset	70 private:
a61af66fc99e Initial load duke parents: diff changeset	71 jlong _max_interval;
a61af66fc99e Initial load duke parents: diff changeset	72
a61af66fc99e Initial load duke parents: diff changeset	73 public:
a61af66fc99e Initial load duke parents: diff changeset	74 LRUMaxHeapPolicy();
a61af66fc99e Initial load duke parents: diff changeset	75
453 c96030fff130 6684579: SoftReference processing can be made more efficient ysr parents: 0 diff changeset	76 // Capture state (of-the-VM) information needed to evaluate the policy
457 27a80744a83b 6778647: snap(), snap_policy() should be renamed setup(), setup_policy() ysr parents: 453 diff changeset	77 void setup();
3992 d1bdeef3e3e2 7098282: G1: assert(interval >= 0) failed: Sanity check, referencePolicy.cpp: 76 johnc parents: 1972 diff changeset	78 virtual bool should_clear_reference(oop p, jlong timestamp_clock);
0 a61af66fc99e Initial load duke parents: diff changeset	79 };
1972 f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1552 diff changeset	80
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1552 diff changeset	81 #endif // SHARE_VM_MEMORY_REFERENCEPOLICY_HPP

Mercurial > hg > truffle

annotate src/share/vm/memory/referencePolicy.hpp @ 20543:e7d0505c8a30