Mercurial > hg > truffle
diff src/share/vm/gc_implementation/g1/survRateGroup.hpp @ 342:37f87013dfd8
6711316: Open source the Garbage-First garbage collector
Summary: First mercurial integration of the code for the Garbage-First garbage collector.
Reviewed-by: apetrusenko, iveresov, jmasa, sgoldman, tonyp, ysr
author | ysr |
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date | Thu, 05 Jun 2008 15:57:56 -0700 |
parents | |
children | 58054a18d735 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/gc_implementation/g1/survRateGroup.hpp Thu Jun 05 15:57:56 2008 -0700 @@ -0,0 +1,102 @@ +/* + * Copyright 2001-2007 Sun Microsystems, Inc. All Rights Reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + +class G1CollectorPolicy; + +class SurvRateGroup : public CHeapObj { +private: + G1CollectorPolicy* _g1p; + const char* _name; + + size_t _array_length; + double* _surv_rate; + double* _accum_surv_rate_pred; + double _last_pred; + double _accum_surv_rate; + TruncatedSeq** _surv_rate_pred; + NumberSeq** _summary_surv_rates; + size_t _summary_surv_rates_len; + size_t _summary_surv_rates_max_len; + + int _all_regions_allocated; + size_t _curr_length; + size_t _scan_only_prefix; + size_t _setup_seq_num; + +public: + SurvRateGroup(G1CollectorPolicy* g1p, + const char* name, + size_t summary_surv_rates_len); + void start_adding_regions(); + void stop_adding_regions(); + void record_scan_only_prefix(size_t scan_only_prefix); + void record_surviving_words(int age_in_group, size_t surv_words); + void all_surviving_words_recorded(bool propagate); + const char* name() { return _name; } + + size_t region_num() { return _curr_length; } + size_t scan_only_length() { return _scan_only_prefix; } + double accum_surv_rate_pred(int age) { + assert(age >= 0, "must be"); + if ((size_t)age < _array_length) + return _accum_surv_rate_pred[age]; + else { + double diff = (double) (age - _array_length + 1); + return _accum_surv_rate_pred[_array_length-1] + diff * _last_pred; + } + } + + double accum_surv_rate(size_t adjustment); + + TruncatedSeq* get_seq(size_t age) { + guarantee( 0 <= age, "pre-condition" ); + if (age >= _setup_seq_num) { + guarantee( _setup_seq_num > 0, "invariant" ); + age = _setup_seq_num-1; + } + TruncatedSeq* seq = _surv_rate_pred[age]; + guarantee( seq != NULL, "invariant" ); + return seq; + } + + int next_age_index(); + int age_in_group(int age_index) { + int ret = (int) (_all_regions_allocated - age_index); + assert( ret >= 0, "invariant" ); + return ret; + } + int recalculate_age_index(int age_index) { + int new_age_index = (int) _scan_only_prefix - age_in_group(age_index); + guarantee( new_age_index >= 0, "invariant" ); + return new_age_index; + } + void finished_recalculating_age_indexes() { + _all_regions_allocated = (int) _scan_only_prefix; + } + +#ifndef PRODUCT + void print(); + void print_surv_rate_summary(); +#endif // PRODUCT +};