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shenandoahAggressiveHeuristics.cpp
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shenandoahAggressiveHeuristics.cpp
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/*
* Copyright (c) 2018, 2019, Red Hat, 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#include "precompiled.hpp"
#include "gc/shenandoah/heuristics/shenandoahAggressiveHeuristics.hpp"
#include "gc/shenandoah/shenandoahCollectionSet.hpp"
#include "gc/shenandoah/shenandoahHeapRegion.inline.hpp"
#include "logging/log.hpp"
#include "logging/logTag.hpp"
#include "runtime/os.hpp"
ShenandoahAggressiveHeuristics::ShenandoahAggressiveHeuristics() : ShenandoahHeuristics() {
// Do not shortcut evacuation
SHENANDOAH_ERGO_OVERRIDE_DEFAULT(ShenandoahImmediateThreshold, 100);
// Aggressive evacuates everything, so it needs as much evac space as it can get
SHENANDOAH_ERGO_ENABLE_FLAG(ShenandoahEvacReserveOverflow);
// If class unloading is globally enabled, aggressive does unloading even with
// concurrent cycles.
if (ClassUnloading) {
SHENANDOAH_ERGO_OVERRIDE_DEFAULT(ShenandoahUnloadClassesFrequency, 1);
}
}
void ShenandoahAggressiveHeuristics::choose_collection_set_from_regiondata(ShenandoahCollectionSet* cset,
RegionData* data, size_t size,
size_t free) {
for (size_t idx = 0; idx < size; idx++) {
ShenandoahHeapRegion* r = data[idx]._region;
if (r->garbage() > 0) {
cset->add_region(r);
}
}
}
bool ShenandoahAggressiveHeuristics::should_start_gc() const {
log_info(gc)("Trigger: Start next cycle immediately");
return true;
}
bool ShenandoahAggressiveHeuristics::should_process_references() {
if (!can_process_references()) return false;
// Randomly process refs with 50% chance.
return (os::random() & 1) == 1;
}
bool ShenandoahAggressiveHeuristics::should_unload_classes() {
if (!can_unload_classes_normal()) return false;
if (has_metaspace_oom()) return true;
// Randomly unload classes with 50% chance.
return (os::random() & 1) == 1;
}
const char* ShenandoahAggressiveHeuristics::name() {
return "aggressive";
}
bool ShenandoahAggressiveHeuristics::is_diagnostic() {
return true;
}
bool ShenandoahAggressiveHeuristics::is_experimental() {
return false;
}