author | rkennke |
Tue, 02 Apr 2019 23:00:22 +0200 | |
changeset 54423 | 6c0ab8bd8da5 |
parent 52925 | 9c18c9d839d3 |
child 54477 | 511be32f3863 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2018, Red Hat, Inc. All rights reserved. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#include "precompiled.hpp" |
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#include "gc/shenandoah/heuristics/shenandoahPassiveHeuristics.hpp" |
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#include "gc/shenandoah/shenandoahCollectionSet.hpp" |
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#include "gc/shenandoah/shenandoahHeapRegion.hpp" |
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#include "logging/log.hpp" |
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#include "logging/logTag.hpp" |
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ShenandoahPassiveHeuristics::ShenandoahPassiveHeuristics() : ShenandoahHeuristics() { |
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// Do not allow concurrent cycles. |
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FLAG_SET_DEFAULT(ExplicitGCInvokesConcurrent, false); |
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FLAG_SET_DEFAULT(ShenandoahImplicitGCInvokesConcurrent, false); |
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// Passive runs with max speed, reacts on allocation failure. |
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FLAG_SET_DEFAULT(ShenandoahPacing, false); |
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// No need for evacuation reserve with Full GC, only for Degenerated GC. |
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if (!ShenandoahDegeneratedGC) { |
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SHENANDOAH_ERGO_OVERRIDE_DEFAULT(ShenandoahEvacReserve, 0); |
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} |
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// Disable known barriers by default. |
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SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahLoadRefBarrier); |
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SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahSATBBarrier); |
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SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahKeepAliveBarrier); |
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SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahStoreValEnqueueBarrier); |
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SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahCASBarrier); |
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SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahCloneBarrier); |
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// Final configuration checks |
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// No barriers are required to run. |
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} |
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bool ShenandoahPassiveHeuristics::should_start_normal_gc() const { |
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// Never do concurrent GCs. |
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return false; |
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} |
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bool ShenandoahPassiveHeuristics::should_process_references() { |
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// Always process references, if we can. |
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return can_process_references(); |
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} |
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bool ShenandoahPassiveHeuristics::should_unload_classes() { |
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// Always unload classes, if we can. |
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return can_unload_classes(); |
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} |
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bool ShenandoahPassiveHeuristics::should_degenerate_cycle() { |
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// Always fail to Degenerated GC, if enabled |
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return ShenandoahDegeneratedGC; |
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} |
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void ShenandoahPassiveHeuristics::choose_collection_set_from_regiondata(ShenandoahCollectionSet* cset, |
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RegionData* data, size_t size, |
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size_t actual_free) { |
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assert(ShenandoahDegeneratedGC, "This path is only taken for Degenerated GC"); |
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// Do not select too large CSet that would overflow the available free space. |
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// Take at least the entire evacuation reserve, and be free to overflow to free space. |
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size_t capacity = ShenandoahHeap::heap()->capacity(); |
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size_t available = MAX2(ShenandoahEvacReserve * capacity / 100, actual_free); |
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size_t max_cset = (size_t)(available / ShenandoahEvacWaste); |
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log_info(gc, ergo)("CSet Selection. Actual Free: " SIZE_FORMAT "M, Max CSet: " SIZE_FORMAT "M", |
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actual_free / M, max_cset / M); |
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size_t threshold = ShenandoahHeapRegion::region_size_bytes() * ShenandoahGarbageThreshold / 100; |
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size_t live_cset = 0; |
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for (size_t idx = 0; idx < size; idx++) { |
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ShenandoahHeapRegion* r = data[idx]._region; |
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size_t new_cset = live_cset + r->get_live_data_bytes(); |
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if (new_cset < max_cset && r->garbage() > threshold) { |
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live_cset = new_cset; |
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cset->add_region(r); |
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} |
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} |
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} |
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const char* ShenandoahPassiveHeuristics::name() { |
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return "passive"; |
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} |
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107 |
|
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bool ShenandoahPassiveHeuristics::is_diagnostic() { |
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return true; |
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} |
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111 |
|
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bool ShenandoahPassiveHeuristics::is_experimental() { |
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return false; |
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} |