1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/gc_implementation/g1/bufferingOopClosure.hpp Thu Jun 05 15:57:56 2008 -0700
1.3 @@ -0,0 +1,195 @@
1.4 +/*
1.5 + * Copyright 2001-2007 Sun Microsystems, Inc. All Rights Reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
1.23 + * CA 95054 USA or visit www.sun.com if you need additional information or
1.24 + * have any questions.
1.25 + *
1.26 + */
1.27 +
1.28 +// A BufferingOops closure tries to separate out the cost of finding roots
1.29 +// from the cost of applying closures to them. It maintains an array of
1.30 +// ref-containing locations. Until the array is full, applying the closure
1.31 +// to an oop* merely records that location in the array. Since this
1.32 +// closure app cost is small, an elapsed timer can approximately attribute
1.33 +// all of this cost to the cost of finding the roots. When the array fills
1.34 +// up, the wrapped closure is applied to all elements, keeping track of
1.35 +// this elapsed time of this process, and leaving the array empty.
1.36 +// The caller must be sure to call "done" to process any unprocessed
1.37 +// buffered entriess.
1.38 +
1.39 +class Generation;
1.40 +class HeapRegion;
1.41 +
1.42 +class BufferingOopClosure: public OopClosure {
1.43 +protected:
1.44 + enum PrivateConstants {
1.45 + BufferLength = 1024
1.46 + };
1.47 +
1.48 + oop *_buffer[BufferLength];
1.49 + oop **_buffer_top;
1.50 + oop **_buffer_curr;
1.51 +
1.52 + OopClosure *_oc;
1.53 + double _closure_app_seconds;
1.54 +
1.55 + void process_buffer () {
1.56 +
1.57 + double start = os::elapsedTime();
1.58 + for (oop **curr = _buffer; curr < _buffer_curr; ++curr) {
1.59 + _oc->do_oop(*curr);
1.60 + }
1.61 + _buffer_curr = _buffer;
1.62 + _closure_app_seconds += (os::elapsedTime() - start);
1.63 + }
1.64 +
1.65 +public:
1.66 + virtual void do_oop(narrowOop* p) {
1.67 + guarantee(false, "NYI");
1.68 + }
1.69 + virtual void do_oop(oop *p) {
1.70 + if (_buffer_curr == _buffer_top) {
1.71 + process_buffer();
1.72 + }
1.73 +
1.74 + *_buffer_curr = p;
1.75 + ++_buffer_curr;
1.76 + }
1.77 + void done () {
1.78 + if (_buffer_curr > _buffer) {
1.79 + process_buffer();
1.80 + }
1.81 + }
1.82 + double closure_app_seconds () {
1.83 + return _closure_app_seconds;
1.84 + }
1.85 + BufferingOopClosure (OopClosure *oc) :
1.86 + _oc(oc),
1.87 + _buffer_curr(_buffer), _buffer_top(_buffer + BufferLength),
1.88 + _closure_app_seconds(0.0) { }
1.89 +};
1.90 +
1.91 +class BufferingOopsInGenClosure: public OopsInGenClosure {
1.92 + BufferingOopClosure _boc;
1.93 + OopsInGenClosure* _oc;
1.94 +public:
1.95 + BufferingOopsInGenClosure(OopsInGenClosure *oc) :
1.96 + _boc(oc), _oc(oc) {}
1.97 +
1.98 + virtual void do_oop(narrowOop* p) {
1.99 + guarantee(false, "NYI");
1.100 + }
1.101 +
1.102 + virtual void do_oop(oop* p) {
1.103 + assert(generation()->is_in_reserved(p), "Must be in!");
1.104 + _boc.do_oop(p);
1.105 + }
1.106 +
1.107 + void done() {
1.108 + _boc.done();
1.109 + }
1.110 +
1.111 + double closure_app_seconds () {
1.112 + return _boc.closure_app_seconds();
1.113 + }
1.114 +
1.115 + void set_generation(Generation* gen) {
1.116 + OopsInGenClosure::set_generation(gen);
1.117 + _oc->set_generation(gen);
1.118 + }
1.119 +
1.120 + void reset_generation() {
1.121 + // Make sure we finish the current work with the current generation.
1.122 + _boc.done();
1.123 + OopsInGenClosure::reset_generation();
1.124 + _oc->reset_generation();
1.125 + }
1.126 +
1.127 +};
1.128 +
1.129 +
1.130 +class BufferingOopsInHeapRegionClosure: public OopsInHeapRegionClosure {
1.131 +private:
1.132 + enum PrivateConstants {
1.133 + BufferLength = 1024
1.134 + };
1.135 +
1.136 + oop *_buffer[BufferLength];
1.137 + oop **_buffer_top;
1.138 + oop **_buffer_curr;
1.139 +
1.140 + HeapRegion *_hr_buffer[BufferLength];
1.141 + HeapRegion **_hr_curr;
1.142 +
1.143 + OopsInHeapRegionClosure *_oc;
1.144 + double _closure_app_seconds;
1.145 +
1.146 + void process_buffer () {
1.147 +
1.148 + assert((_hr_curr - _hr_buffer) == (_buffer_curr - _buffer),
1.149 + "the two lengths should be the same");
1.150 +
1.151 + double start = os::elapsedTime();
1.152 + HeapRegion **hr_curr = _hr_buffer;
1.153 + HeapRegion *hr_prev = NULL;
1.154 + for (oop **curr = _buffer; curr < _buffer_curr; ++curr) {
1.155 + HeapRegion *region = *hr_curr;
1.156 + if (region != hr_prev) {
1.157 + _oc->set_region(region);
1.158 + hr_prev = region;
1.159 + }
1.160 + _oc->do_oop(*curr);
1.161 + ++hr_curr;
1.162 + }
1.163 + _buffer_curr = _buffer;
1.164 + _hr_curr = _hr_buffer;
1.165 + _closure_app_seconds += (os::elapsedTime() - start);
1.166 + }
1.167 +
1.168 +public:
1.169 + virtual void do_oop(narrowOop *p) {
1.170 + guarantee(false, "NYI");
1.171 + }
1.172 +
1.173 + virtual void do_oop(oop *p) {
1.174 + if (_buffer_curr == _buffer_top) {
1.175 + assert(_hr_curr > _hr_buffer, "_hr_curr should be consistent with _buffer_curr");
1.176 + process_buffer();
1.177 + }
1.178 +
1.179 + *_buffer_curr = p;
1.180 + ++_buffer_curr;
1.181 + *_hr_curr = _from;
1.182 + ++_hr_curr;
1.183 + }
1.184 + void done () {
1.185 + if (_buffer_curr > _buffer) {
1.186 + assert(_hr_curr > _hr_buffer, "_hr_curr should be consistent with _buffer_curr");
1.187 + process_buffer();
1.188 + }
1.189 + }
1.190 + double closure_app_seconds () {
1.191 + return _closure_app_seconds;
1.192 + }
1.193 + BufferingOopsInHeapRegionClosure (OopsInHeapRegionClosure *oc) :
1.194 + _oc(oc),
1.195 + _buffer_curr(_buffer), _buffer_top(_buffer + BufferLength),
1.196 + _hr_curr(_hr_buffer),
1.197 + _closure_app_seconds(0.0) { }
1.198 +};
