--- a/hotspot/src/share/vm/gc/g1/g1CollectedHeap.cpp Fri Sep 02 08:51:26 2016 +0200
+++ b/hotspot/src/share/vm/gc/g1/g1CollectedHeap.cpp Fri Sep 02 11:18:04 2016 +0200
@@ -4513,6 +4513,7 @@
#if defined(COMPILER2) || INCLUDE_JVMCI
DerivedPointerTable::update_pointers();
#endif
+ g1_policy()->print_age_table();
}
void G1CollectedHeap::record_obj_copy_mem_stats() {
--- a/hotspot/src/share/vm/gc/g1/g1DefaultPolicy.cpp Fri Sep 02 08:51:26 2016 +0200
+++ b/hotspot/src/share/vm/gc/g1/g1DefaultPolicy.cpp Fri Sep 02 11:18:04 2016 +0200
@@ -885,6 +885,15 @@
return _young_gen_sizer.adaptive_young_list_length();
}
+size_t G1DefaultPolicy::desired_survivor_size() const {
+ size_t const survivor_capacity = HeapRegion::GrainWords * _max_survivor_regions;
+ return (size_t)((((double)survivor_capacity) * TargetSurvivorRatio) / 100);
+}
+
+void G1DefaultPolicy::print_age_table() {
+ _survivors_age_table.print_age_table(_tenuring_threshold);
+}
+
void G1DefaultPolicy::update_max_gc_locker_expansion() {
uint expansion_region_num = 0;
if (GCLockerEdenExpansionPercent > 0) {
@@ -908,8 +917,11 @@
// smaller than 1.0) we'll get 1.
_max_survivor_regions = (uint) ceil(max_survivor_regions_d);
- _tenuring_threshold = _survivors_age_table.compute_tenuring_threshold(
- HeapRegion::GrainWords * _max_survivor_regions, _policy_counters);
+ _tenuring_threshold = _survivors_age_table.compute_tenuring_threshold(desired_survivor_size());
+ if (UsePerfData) {
+ _policy_counters->tenuring_threshold()->set_value(_tenuring_threshold);
+ _policy_counters->desired_survivor_size()->set_value(desired_survivor_size() * oopSize);
+ }
}
bool G1DefaultPolicy::force_initial_mark_if_outside_cycle(GCCause::Cause gc_cause) {
--- a/hotspot/src/share/vm/gc/g1/g1DefaultPolicy.hpp Fri Sep 02 08:51:26 2016 +0200
+++ b/hotspot/src/share/vm/gc/g1/g1DefaultPolicy.hpp Fri Sep 02 11:18:04 2016 +0200
@@ -360,6 +360,8 @@
AgeTable _survivors_age_table;
+protected:
+ size_t desired_survivor_size() const;
public:
uint tenuring_threshold() const { return _tenuring_threshold; }
@@ -379,6 +381,8 @@
_survivors_age_table.merge(age_table);
}
+ void print_age_table();
+
void update_max_gc_locker_expansion();
void update_survivors_policy();
--- a/hotspot/src/share/vm/gc/g1/g1Policy.hpp Fri Sep 02 08:51:26 2016 +0200
+++ b/hotspot/src/share/vm/gc/g1/g1Policy.hpp Fri Sep 02 11:18:04 2016 +0200
@@ -181,6 +181,9 @@
virtual void note_stop_adding_survivor_regions() = 0;
virtual void record_age_table(AgeTable* age_table) = 0;
+ virtual void print_age_table() = 0;
+protected:
+ virtual size_t desired_survivor_size() const = 0;
};
#endif // SHARE_VM_GC_G1_G1POLICY_HPP
--- a/hotspot/src/share/vm/gc/serial/defNewGeneration.cpp Fri Sep 02 08:51:26 2016 +0200
+++ b/hotspot/src/share/vm/gc/serial/defNewGeneration.cpp Fri Sep 02 11:18:04 2016 +0200
@@ -564,9 +564,18 @@
void DefNewGeneration::adjust_desired_tenuring_threshold() {
// Set the desired survivor size to half the real survivor space
- GCPolicyCounters* gc_counters = GenCollectedHeap::heap()->gen_policy()->counters();
- _tenuring_threshold =
- age_table()->compute_tenuring_threshold(to()->capacity()/HeapWordSize, gc_counters);
+ size_t const survivor_capacity = to()->capacity() / HeapWordSize;
+ size_t const desired_survivor_size = (size_t)((((double)survivor_capacity) * TargetSurvivorRatio) / 100);
+
+ _tenuring_threshold = age_table()->compute_tenuring_threshold(desired_survivor_size);
+
+ if (UsePerfData) {
+ GCPolicyCounters* gc_counters = GenCollectedHeap::heap()->gen_policy()->counters();
+ gc_counters->tenuring_threshold()->set_value(_tenuring_threshold);
+ gc_counters->desired_survivor_size()->set_value(desired_survivor_size * oopSize);
+ }
+
+ age_table()->print_age_table(_tenuring_threshold);
}
void DefNewGeneration::collect(bool full,
--- a/hotspot/src/share/vm/gc/shared/ageTable.cpp Fri Sep 02 08:51:26 2016 +0200
+++ b/hotspot/src/share/vm/gc/shared/ageTable.cpp Fri Sep 02 11:18:04 2016 +0200
@@ -27,7 +27,6 @@
#include "gc/shared/ageTableTracer.hpp"
#include "gc/shared/collectedHeap.hpp"
#include "gc/shared/collectorPolicy.hpp"
-#include "gc/shared/gcPolicyCounters.hpp"
#include "memory/resourceArea.hpp"
#include "logging/log.hpp"
#include "oops/oop.inline.hpp"
@@ -75,8 +74,7 @@
}
}
-uint AgeTable::compute_tenuring_threshold(size_t survivor_capacity, GCPolicyCounters* gc_counters) {
- size_t desired_survivor_size = (size_t)((((double) survivor_capacity)*TargetSurvivorRatio)/100);
+uint AgeTable::compute_tenuring_threshold(size_t desired_survivor_size) {
uint result;
if (AlwaysTenure || NeverTenure) {
@@ -99,9 +97,16 @@
log_debug(gc, age)("Desired survivor size " SIZE_FORMAT " bytes, new threshold " UINTX_FORMAT " (max threshold " UINTX_FORMAT ")",
- desired_survivor_size*oopSize, (uintx) result, MaxTenuringThreshold);
+ desired_survivor_size * oopSize, (uintx) result, MaxTenuringThreshold);
+
+ return result;
+}
+void AgeTable::print_age_table(uint tenuring_threshold) {
if (log_is_enabled(Trace, gc, age) || UsePerfData || AgeTableTracer::is_tenuring_distribution_event_enabled()) {
+ log_trace(gc, age)("Age table with threshold %u (max threshold " UINTX_FORMAT ")",
+ tenuring_threshold, MaxTenuringThreshold);
+
size_t total = 0;
uint age = 1;
while (age < table_size) {
@@ -109,20 +114,14 @@
total += wordSize;
if (wordSize > 0) {
log_trace(gc, age)("- age %3u: " SIZE_FORMAT_W(10) " bytes, " SIZE_FORMAT_W(10) " total",
- age, wordSize*oopSize, total*oopSize);
+ age, wordSize * oopSize, total * oopSize);
}
- AgeTableTracer::send_tenuring_distribution_event(age, wordSize*oopSize);
+ AgeTableTracer::send_tenuring_distribution_event(age, wordSize * oopSize);
if (UsePerfData) {
- _perf_sizes[age]->set_value(wordSize*oopSize);
+ _perf_sizes[age]->set_value(wordSize * oopSize);
}
age++;
}
- if (UsePerfData) {
- gc_counters->tenuring_threshold()->set_value(result);
- gc_counters->desired_survivor_size()->set_value(
- desired_survivor_size*oopSize);
- }
}
+}
- return result;
-}
--- a/hotspot/src/share/vm/gc/shared/ageTable.hpp Fri Sep 02 08:51:26 2016 +0200
+++ b/hotspot/src/share/vm/gc/shared/ageTable.hpp Fri Sep 02 11:18:04 2016 +0200
@@ -29,8 +29,6 @@
#include "oops/oop.hpp"
#include "runtime/perfData.hpp"
-class GCPolicyCounters;
-
/* Copyright (c) 1992, 2016, Oracle and/or its affiliates, and Stanford University.
See the LICENSE file for license information. */
@@ -67,10 +65,12 @@
// for parallel young generation gc.
void merge(AgeTable* subTable);
- // calculate new tenuring threshold based on age information
- uint compute_tenuring_threshold(size_t survivor_capacity, GCPolicyCounters* gc_counters);
+ // Calculate new tenuring threshold based on age information.
+ uint compute_tenuring_threshold(size_t desired_survivor_size);
+ void print_age_table(uint tenuring_threshold);
private:
+
PerfVariable* _perf_sizes[table_size];
};
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/gc/TestAgeOutput.java Fri Sep 02 11:18:04 2016 +0200
@@ -0,0 +1,103 @@
+/*
+ * Copyright (c) 2016, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test TestAgeOutput
+ * @bug 8164936
+ * @summary Check that collectors using age table based aging print an age table even for the first garbage collection
+ * @key gc
+ * @requires vm.gc=="null"
+ * @modules java.base/jdk.internal.misc
+ * @library /test/lib
+ * @build sun.hotspot.WhiteBox
+ * @run main ClassFileInstaller sun.hotspot.WhiteBox
+ * @run main/othervm -XX:+UseSerialGC TestAgeOutput UseSerialGC
+ * @run main/othervm -XX:+UseConcMarkSweepGC TestAgeOutput UseConcMarkSweepGC
+ * @run main/othervm -XX:+UseG1GC TestAgeOutput UseG1GC
+ */
+
+import sun.hotspot.WhiteBox;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import jdk.test.lib.Platform;
+import jdk.test.lib.process.OutputAnalyzer;
+import jdk.test.lib.process.ProcessTools;
+
+import static jdk.test.lib.Asserts.*;
+
+public class TestAgeOutput {
+
+ public static void checkPattern(String pattern, String what) throws Exception {
+ Pattern r = Pattern.compile(pattern);
+ Matcher m = r.matcher(what);
+
+ if (!m.find()) {
+ throw new RuntimeException("Could not find pattern " + pattern + " in output");
+ }
+ }
+
+ public static void runTest(String gcArg) throws Exception {
+ final String[] arguments = {
+ "-Xbootclasspath/a:.",
+ "-XX:+UnlockExperimentalVMOptions",
+ "-XX:+UnlockDiagnosticVMOptions",
+ "-XX:+WhiteBoxAPI",
+ "-XX:+" + gcArg,
+ "-Xmx10M",
+ "-Xlog:gc+age=trace",
+ GCTest.class.getName()
+ };
+
+ ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(arguments);
+ OutputAnalyzer output = new OutputAnalyzer(pb.start());
+
+ output.shouldHaveExitValue(0);
+
+ System.out.println(output.getStdout());
+
+ String stdout = output.getStdout();
+
+ checkPattern(".*GC\\(0\\) .*Desired survivor size.*", stdout);
+ checkPattern(".*GC\\(0\\) .*Age table with threshold.*", stdout);
+ checkPattern(".*GC\\(0\\) .*- age 1:.*", stdout);
+ }
+
+ public static void main(String[] args) throws Exception {
+ runTest(args[0]);
+ }
+
+ static class GCTest {
+ private static final WhiteBox WB = WhiteBox.getWhiteBox();
+
+ public static Object holder;
+
+ public static void main(String [] args) {
+ holder = new byte[100];
+ WB.youngGC();
+ System.out.println(holder);
+ }
+ }
+}
+