| /* |
| * Copyright (c) 2019, Red Hat, Inc. All rights reserved. |
| * |
| * 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/shenandoahPassiveHeuristics.hpp" |
| #include "gc/shenandoah/mode/shenandoahPassiveMode.hpp" |
| #include "logging/log.hpp" |
| #include "logging/logTag.hpp" |
| |
| void ShenandoahPassiveMode::initialize_flags() const { |
| // Do not allow concurrent cycles. |
| FLAG_SET_DEFAULT(ExplicitGCInvokesConcurrent, false); |
| FLAG_SET_DEFAULT(ShenandoahImplicitGCInvokesConcurrent, false); |
| |
| // Passive runs with max speed for allocation, because GC is always STW |
| SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahPacing); |
| |
| // No need for evacuation reserve with Full GC, only for Degenerated GC. |
| if (!ShenandoahDegeneratedGC) { |
| SHENANDOAH_ERGO_OVERRIDE_DEFAULT(ShenandoahEvacReserve, 0); |
| } |
| |
| // Disable known barriers by default. |
| SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahLoadRefBarrier); |
| SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahSATBBarrier); |
| SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahIUBarrier); |
| SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahCASBarrier); |
| SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahCloneBarrier); |
| |
| // Final configuration checks |
| // No barriers are required to run. |
| } |
| ShenandoahHeuristics* ShenandoahPassiveMode::initialize_heuristics() const { |
| if (ShenandoahGCHeuristics != NULL) { |
| return new ShenandoahPassiveHeuristics(); |
| } |
| ShouldNotReachHere(); |
| return NULL; |
| } |