6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "gc/shenandoah/heuristics/shenandoahPassiveHeuristics.hpp"
27 #include "gc/shenandoah/mode/shenandoahPassiveMode.hpp"
28 #include "logging/log.hpp"
29 #include "logging/logTag.hpp"
30 #include "runtime/globals_extension.hpp"
31 #include "runtime/java.hpp"
32
33 void ShenandoahPassiveMode::initialize_flags() const {
34 // Do not allow concurrent cycles.
35 FLAG_SET_DEFAULT(ExplicitGCInvokesConcurrent, false);
36 FLAG_SET_DEFAULT(ShenandoahImplicitGCInvokesConcurrent, false);
37
38 // Passive runs with max speed for allocation, because GC is always STW
39 SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahPacing);
40
41 // No need for evacuation reserve with Full GC, only for Degenerated GC.
42 if (!ShenandoahDegeneratedGC) {
43 SHENANDOAH_ERGO_OVERRIDE_DEFAULT(ShenandoahEvacReserve, 0);
44 }
45
46 // Disable known barriers by default.
47 SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahLoadRefBarrier);
48 SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahSATBBarrier);
49 SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahIUBarrier);
50 SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahCASBarrier);
51 SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahCloneBarrier);
52 SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahStackWatermarkBarrier);
53
54 // Final configuration checks
55 // No barriers are required to run.
56 }
57 ShenandoahHeuristics* ShenandoahPassiveMode::initialize_heuristics() const {
58 if (ShenandoahGCHeuristics == nullptr) {
59 vm_exit_during_initialization("Unknown -XX:ShenandoahGCHeuristics option (null)");
60 }
61 return new ShenandoahPassiveHeuristics();
62 }
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6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "gc/shenandoah/heuristics/shenandoahHeuristics.hpp"
27 #include "gc/shenandoah/heuristics/shenandoahSpaceInfo.hpp"
28 #include "gc/shenandoah/heuristics/shenandoahPassiveHeuristics.hpp"
29 #include "gc/shenandoah/mode/shenandoahPassiveMode.hpp"
30 #include "gc/shenandoah/shenandoahHeap.inline.hpp"
31 #include "logging/log.hpp"
32 #include "logging/logTag.hpp"
33 #include "runtime/java.hpp"
34
35 void ShenandoahPassiveMode::initialize_flags() const {
36 // Do not allow concurrent cycles.
37 FLAG_SET_DEFAULT(ExplicitGCInvokesConcurrent, false);
38 FLAG_SET_DEFAULT(ShenandoahImplicitGCInvokesConcurrent, false);
39
40 // Passive runs with max speed for allocation, because GC is always STW
41 SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahPacing);
42
43 // No need for evacuation reserve with Full GC, only for Degenerated GC.
44 if (!ShenandoahDegeneratedGC) {
45 SHENANDOAH_ERGO_OVERRIDE_DEFAULT(ShenandoahEvacReserve, 0);
46 }
47
48 // Disable known barriers by default.
49 SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahLoadRefBarrier);
50 SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahSATBBarrier);
51 SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahIUBarrier);
52 SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahCASBarrier);
53 SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahCloneBarrier);
54 SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahStackWatermarkBarrier);
55 SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahCardBarrier);
56
57 // Final configuration checks
58 // Passive mode does not instantiate the machinery to support the card table.
59 // Exit if the flag has been explicitly set.
60 SHENANDOAH_CHECK_FLAG_UNSET(ShenandoahCardBarrier);
61 }
62
63 ShenandoahHeuristics* ShenandoahPassiveMode::initialize_heuristics(ShenandoahSpaceInfo* space_info) const {
64 if (ShenandoahGCHeuristics == nullptr) {
65 vm_exit_during_initialization("Unknown -XX:ShenandoahGCHeuristics option (null)");
66 }
67 return new ShenandoahPassiveHeuristics(space_info);
68 }
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