--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/gc_implementation/g1/survRateGroup.cpp Thu Jun 05 15:57:56 2008 -0700
@@ -0,0 +1,264 @@
+/*
+ * 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.
+ *
+ */
+
+#include "incls/_precompiled.incl"
+#include "incls/_survRateGroup.cpp.incl"
+
+SurvRateGroup::SurvRateGroup(G1CollectorPolicy* g1p,
+ const char* name,
+ size_t summary_surv_rates_len) :
+ _g1p(g1p), _name(name),
+ _all_regions_allocated(0),
+ _curr_length(0), _scan_only_prefix(0), _setup_seq_num(0),
+ _array_length(0), _surv_rate(NULL), _accum_surv_rate_pred(NULL),
+ _accum_surv_rate(0.0), _surv_rate_pred(NULL), _last_pred(0.0),
+ _summary_surv_rates_len(summary_surv_rates_len),
+ _summary_surv_rates_max_len(0),
+ _summary_surv_rates(NULL) {
+
+ // the following will set up the arrays with length 1
+ _curr_length = 1;
+ stop_adding_regions();
+ guarantee( _array_length == 1, "invariant" );
+ guarantee( _surv_rate_pred[0] != NULL, "invariant" );
+ _surv_rate_pred[0]->add(0.4);
+ all_surviving_words_recorded(false);
+ _curr_length = 0;
+
+ if (summary_surv_rates_len > 0) {
+ size_t length = summary_surv_rates_len;
+ _summary_surv_rates = NEW_C_HEAP_ARRAY(NumberSeq*, length);
+ if (_summary_surv_rates == NULL) {
+ vm_exit_out_of_memory(sizeof(NumberSeq*) * length,
+ "Not enough space for surv rate summary");
+ }
+ for (size_t i = 0; i < length; ++i)
+ _summary_surv_rates[i] = new NumberSeq();
+ }
+
+ start_adding_regions();
+}
+
+void
+SurvRateGroup::start_adding_regions() {
+ _setup_seq_num = _array_length;
+ _curr_length = _scan_only_prefix;
+ _accum_surv_rate = 0.0;
+
+#if 0
+ gclog_or_tty->print_cr("start adding regions, seq num %d, length %d",
+ _setup_seq_num, _curr_length);
+#endif // 0
+}
+
+void
+SurvRateGroup::stop_adding_regions() {
+ size_t length = _curr_length;
+
+#if 0
+ gclog_or_tty->print_cr("stop adding regions, length %d", length);
+#endif // 0
+
+ if (length > _array_length) {
+ double* old_surv_rate = _surv_rate;
+ double* old_accum_surv_rate_pred = _accum_surv_rate_pred;
+ TruncatedSeq** old_surv_rate_pred = _surv_rate_pred;
+
+ _surv_rate = NEW_C_HEAP_ARRAY(double, length);
+ if (_surv_rate == NULL) {
+ vm_exit_out_of_memory(sizeof(double) * length,
+ "Not enough space for surv rate array.");
+ }
+ _accum_surv_rate_pred = NEW_C_HEAP_ARRAY(double, length);
+ if (_accum_surv_rate_pred == NULL) {
+ vm_exit_out_of_memory(sizeof(double) * length,
+ "Not enough space for accum surv rate pred array.");
+ }
+ _surv_rate_pred = NEW_C_HEAP_ARRAY(TruncatedSeq*, length);
+ if (_surv_rate == NULL) {
+ vm_exit_out_of_memory(sizeof(TruncatedSeq*) * length,
+ "Not enough space for surv rate pred array.");
+ }
+
+ for (size_t i = 0; i < _array_length; ++i)
+ _surv_rate_pred[i] = old_surv_rate_pred[i];
+
+#if 0
+ gclog_or_tty->print_cr("stop adding regions, new seqs %d to %d",
+ _array_length, length - 1);
+#endif // 0
+
+ for (size_t i = _array_length; i < length; ++i) {
+ _surv_rate_pred[i] = new TruncatedSeq(10);
+ // _surv_rate_pred[i]->add(last_pred);
+ }
+
+ _array_length = length;
+
+ if (old_surv_rate != NULL)
+ FREE_C_HEAP_ARRAY(double, old_surv_rate);
+ if (old_accum_surv_rate_pred != NULL)
+ FREE_C_HEAP_ARRAY(double, old_accum_surv_rate_pred);
+ if (old_surv_rate_pred != NULL)
+ FREE_C_HEAP_ARRAY(NumberSeq*, old_surv_rate_pred);
+ }
+
+ for (size_t i = 0; i < _array_length; ++i)
+ _surv_rate[i] = 0.0;
+}
+
+double
+SurvRateGroup::accum_surv_rate(size_t adjustment) {
+ // we might relax this one in the future...
+ guarantee( adjustment == 0 || adjustment == 1, "pre-condition" );
+
+ double ret = _accum_surv_rate;
+ if (adjustment > 0) {
+ TruncatedSeq* seq = get_seq(_curr_length+1);
+ double surv_rate = _g1p->get_new_prediction(seq);
+ ret += surv_rate;
+ }
+
+ return ret;
+}
+
+int
+SurvRateGroup::next_age_index() {
+ TruncatedSeq* seq = get_seq(_curr_length);
+ double surv_rate = _g1p->get_new_prediction(seq);
+ _accum_surv_rate += surv_rate;
+
+ ++_curr_length;
+ return (int) ++_all_regions_allocated;
+}
+
+void
+SurvRateGroup::record_scan_only_prefix(size_t scan_only_prefix) {
+ guarantee( scan_only_prefix <= _curr_length, "pre-condition" );
+ _scan_only_prefix = scan_only_prefix;
+}
+
+void
+SurvRateGroup::record_surviving_words(int age_in_group, size_t surv_words) {
+ guarantee( 0 <= age_in_group && (size_t) age_in_group < _curr_length,
+ "pre-condition" );
+ guarantee( _surv_rate[age_in_group] <= 0.00001,
+ "should only update each slot once" );
+
+ double surv_rate = (double) surv_words / (double) HeapRegion::GrainWords;
+ _surv_rate[age_in_group] = surv_rate;
+ _surv_rate_pred[age_in_group]->add(surv_rate);
+ if ((size_t)age_in_group < _summary_surv_rates_len) {
+ _summary_surv_rates[age_in_group]->add(surv_rate);
+ if ((size_t)(age_in_group+1) > _summary_surv_rates_max_len)
+ _summary_surv_rates_max_len = age_in_group+1;
+ }
+}
+
+void
+SurvRateGroup::all_surviving_words_recorded(bool propagate) {
+ if (propagate && _curr_length > 0) { // conservative
+ double surv_rate = _surv_rate_pred[_curr_length-1]->last();
+
+#if 0
+ gclog_or_tty->print_cr("propagating %1.2lf from %d to %d",
+ surv_rate, _curr_length, _array_length - 1);
+#endif // 0
+
+ for (size_t i = _curr_length; i < _array_length; ++i) {
+ guarantee( _surv_rate[i] <= 0.00001,
+ "the slot should not have been updated" );
+ _surv_rate_pred[i]->add(surv_rate);
+ }
+ }
+
+ double accum = 0.0;
+ double pred = 0.0;
+ for (size_t i = 0; i < _array_length; ++i) {
+ pred = _g1p->get_new_prediction(_surv_rate_pred[i]);
+ if (pred > 1.0) pred = 1.0;
+ accum += pred;
+ _accum_surv_rate_pred[i] = accum;
+ // gclog_or_tty->print_cr("age %3d, accum %10.2lf", i, accum);
+ }
+ _last_pred = pred;
+}
+
+#ifndef PRODUCT
+void
+SurvRateGroup::print() {
+ gclog_or_tty->print_cr("Surv Rate Group: %s (%d entries, %d scan-only)",
+ _name, _curr_length, _scan_only_prefix);
+ for (size_t i = 0; i < _curr_length; ++i) {
+ gclog_or_tty->print_cr(" age %4d surv rate %6.2lf %% pred %6.2lf %%%s",
+ i, _surv_rate[i] * 100.0,
+ _g1p->get_new_prediction(_surv_rate_pred[i]) * 100.0,
+ (i < _scan_only_prefix) ? " S-O" : " ");
+ }
+}
+
+void
+SurvRateGroup::print_surv_rate_summary() {
+ size_t length = _summary_surv_rates_max_len;
+ if (length == 0)
+ return;
+
+ gclog_or_tty->print_cr("");
+ gclog_or_tty->print_cr("%s Rate Summary (for up to age %d)", _name, length-1);
+ gclog_or_tty->print_cr(" age range survival rate (avg) samples (avg)");
+ gclog_or_tty->print_cr(" ---------------------------------------------------------");
+
+ size_t index = 0;
+ size_t limit = MIN2((int) length, 10);
+ while (index < limit) {
+ gclog_or_tty->print_cr(" %4d %6.2lf%% %6.2lf",
+ index, _summary_surv_rates[index]->avg() * 100.0,
+ (double) _summary_surv_rates[index]->num());
+ ++index;
+ }
+
+ gclog_or_tty->print_cr(" ---------------------------------------------------------");
+
+ int num = 0;
+ double sum = 0.0;
+ int samples = 0;
+ while (index < length) {
+ ++num;
+ sum += _summary_surv_rates[index]->avg() * 100.0;
+ samples += _summary_surv_rates[index]->num();
+ ++index;
+
+ if (index == length || num % 10 == 0) {
+ gclog_or_tty->print_cr(" %4d .. %4d %6.2lf%% %6.2lf",
+ (index-1) / 10 * 10, index-1, sum / (double) num,
+ (double) samples / (double) num);
+ sum = 0.0;
+ num = 0;
+ samples = 0;
+ }
+ }
+
+ gclog_or_tty->print_cr(" ---------------------------------------------------------");
+}
+#endif // PRODUCT