5 * This code is free software; you can redistribute it and/or modify it
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
26 // Tasks for parallel compaction of the old generation
27 //
28 // Tasks are created and enqueued on a task queue. The
29 // tasks for parallel old collector for marking objects
30 // are MarkFromRootsTask and ThreadRootsMarkingTask.
31 //
32 // MarkFromRootsTask's are created
33 // with a root group (e.g., jni_handles) and when the do_it()
34 // method of a MarkFromRootsTask is executed, it starts marking
35 // form it's root group.
36 //
37 // ThreadRootsMarkingTask's are created for each Java thread. When
38 // the do_it() method of a ThreadRootsMarkingTask is executed, it
39 // starts marking from the thread's roots.
40 //
41 // The enqueuing of the MarkFromRootsTask and ThreadRootsMarkingTask
42 // do little more than create the task and put it on a queue. The
43 // queue is a GCTaskQueue and threads steal tasks from this GCTaskQueue.
44 //
233 // DrainStacksCompactionTask
234 //
235 // This task processes regions that have been added to the stacks of each
236 // compaction manager.
237 //
238 // Trying to use one draining thread does not work because there are no
239 // guarantees about which task will be picked up by which thread. For example,
240 // if thread A gets all the preloaded regions, thread A may not get a draining
241 // task (they may all be done by other threads).
242 //
243
244 class DrainStacksCompactionTask : public GCTask {
245 uint _stack_index;
246 uint stack_index() { return _stack_index; }
247 public:
248 DrainStacksCompactionTask(uint stack_index) : GCTask(),
249 _stack_index(stack_index) {};
250 char* name() { return (char *)"drain-region-task"; }
251 virtual void do_it(GCTaskManager* manager, uint which);
252 };
|
5 * This code is free software; you can redistribute it and/or modify it
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 #ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PCTASKS_HPP
26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PCTASKS_HPP
27
28 #include "gc_implementation/parallelScavenge/gcTaskManager.hpp"
29 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp"
30 #include "gc_implementation/parallelScavenge/psTasks.hpp"
31
32
33 // Tasks for parallel compaction of the old generation
34 //
35 // Tasks are created and enqueued on a task queue. The
36 // tasks for parallel old collector for marking objects
37 // are MarkFromRootsTask and ThreadRootsMarkingTask.
38 //
39 // MarkFromRootsTask's are created
40 // with a root group (e.g., jni_handles) and when the do_it()
41 // method of a MarkFromRootsTask is executed, it starts marking
42 // form it's root group.
43 //
44 // ThreadRootsMarkingTask's are created for each Java thread. When
45 // the do_it() method of a ThreadRootsMarkingTask is executed, it
46 // starts marking from the thread's roots.
47 //
48 // The enqueuing of the MarkFromRootsTask and ThreadRootsMarkingTask
49 // do little more than create the task and put it on a queue. The
50 // queue is a GCTaskQueue and threads steal tasks from this GCTaskQueue.
51 //
240 // DrainStacksCompactionTask
241 //
242 // This task processes regions that have been added to the stacks of each
243 // compaction manager.
244 //
245 // Trying to use one draining thread does not work because there are no
246 // guarantees about which task will be picked up by which thread. For example,
247 // if thread A gets all the preloaded regions, thread A may not get a draining
248 // task (they may all be done by other threads).
249 //
250
251 class DrainStacksCompactionTask : public GCTask {
252 uint _stack_index;
253 uint stack_index() { return _stack_index; }
254 public:
255 DrainStacksCompactionTask(uint stack_index) : GCTask(),
256 _stack_index(stack_index) {};
257 char* name() { return (char *)"drain-region-task"; }
258 virtual void do_it(GCTaskManager* manager, uint which);
259 };
260
261 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PCTASKS_HPP
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