Mon, 20 Sep 2010 14:38:38 -0700
6984287: Regularize how GC parallel workers are specified.
Summary: Associate number of GC workers with the workgang as opposed to the task.
Reviewed-by: johnc, ysr
1 /*
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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13 * accompanied this code).
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23 */
25 //
26 // psTasks.hpp is a collection of GCTasks used by the
27 // parallelScavenge collector.
28 //
30 class GCTask;
31 class OopClosure;
32 class OopStack;
33 class ObjectStartArray;
34 class ParallelTaskTerminator;
35 class MutableSpace;
36 class PSOldGen;
37 class Thread;
38 class VMThread;
40 //
41 // ScavengeRootsTask
42 //
43 // This task scans all the roots of a given type.
44 //
45 //
47 class ScavengeRootsTask : public GCTask {
48 public:
49 enum RootType {
50 universe = 1,
51 jni_handles = 2,
52 threads = 3,
53 object_synchronizer = 4,
54 flat_profiler = 5,
55 system_dictionary = 6,
56 management = 7,
57 jvmti = 8,
58 code_cache = 9
59 };
60 private:
61 RootType _root_type;
62 public:
63 ScavengeRootsTask(RootType value) : _root_type(value) {}
65 char* name() { return (char *)"scavenge-roots-task"; }
67 virtual void do_it(GCTaskManager* manager, uint which);
68 };
70 //
71 // ThreadRootsTask
72 //
73 // This task scans the roots of a single thread. This task
74 // enables scanning of thread roots in parallel.
75 //
77 class ThreadRootsTask : public GCTask {
78 private:
79 JavaThread* _java_thread;
80 VMThread* _vm_thread;
81 public:
82 ThreadRootsTask(JavaThread* root) : _java_thread(root), _vm_thread(NULL) {}
83 ThreadRootsTask(VMThread* root) : _java_thread(NULL), _vm_thread(root) {}
85 char* name() { return (char *)"thread-roots-task"; }
87 virtual void do_it(GCTaskManager* manager, uint which);
88 };
90 //
91 // StealTask
92 //
93 // This task is used to distribute work to idle threads.
94 //
96 class StealTask : public GCTask {
97 private:
98 ParallelTaskTerminator* const _terminator;
99 public:
100 char* name() { return (char *)"steal-task"; }
102 StealTask(ParallelTaskTerminator* t);
104 ParallelTaskTerminator* terminator() { return _terminator; }
106 virtual void do_it(GCTaskManager* manager, uint which);
107 };
109 //
110 // SerialOldToYoungRootsTask
111 //
112 // This task is used to scan for roots in the perm gen
114 class SerialOldToYoungRootsTask : public GCTask {
115 private:
116 PSOldGen* _gen;
117 HeapWord* _gen_top;
119 public:
120 SerialOldToYoungRootsTask(PSOldGen *gen, HeapWord* gen_top) :
121 _gen(gen), _gen_top(gen_top) { }
123 char* name() { return (char *)"serial-old-to-young-roots-task"; }
125 virtual void do_it(GCTaskManager* manager, uint which);
126 };
128 //
129 // OldToYoungRootsTask
130 //
131 // This task is used to scan old to young roots in parallel
133 class OldToYoungRootsTask : public GCTask {
134 private:
135 PSOldGen* _gen;
136 HeapWord* _gen_top;
137 uint _stripe_number;
139 public:
140 OldToYoungRootsTask(PSOldGen *gen, HeapWord* gen_top, uint stripe_number) :
141 _gen(gen), _gen_top(gen_top), _stripe_number(stripe_number) { }
143 char* name() { return (char *)"old-to-young-roots-task"; }
145 virtual void do_it(GCTaskManager* manager, uint which);
146 };