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comparison src/share/vm/memory/sharedHeap.cpp @ 1833:8b10f48633dc

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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
author jmasa
date Mon, 20 Sep 2010 14:38:38 -0700
parents c18cbe5936b8
children f95d63e2154a
comparison
equal deleted inserted replaced
1781:97fbf5beff7b 1833:8b10f48633dc
1 /* 1 /*
2 * Copyright (c) 2000, 2009, Oracle and/or its affiliates. All rights reserved. 2 * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 * 4 *
5 * This code is free software; you can redistribute it and/or modify it 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 6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. 7 * published by the Free Software Foundation.
48 CollectedHeap(), 48 CollectedHeap(),
49 _collector_policy(policy_), 49 _collector_policy(policy_),
50 _perm_gen(NULL), _rem_set(NULL), 50 _perm_gen(NULL), _rem_set(NULL),
51 _strong_roots_parity(0), 51 _strong_roots_parity(0),
52 _process_strong_tasks(new SubTasksDone(SH_PS_NumElements)), 52 _process_strong_tasks(new SubTasksDone(SH_PS_NumElements)),
53 _workers(NULL), _n_par_threads(0) 53 _n_par_threads(0),
54 _workers(NULL)
54 { 55 {
55 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { 56 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) {
56 vm_exit_during_initialization("Failed necessary allocation."); 57 vm_exit_during_initialization("Failed necessary allocation.");
57 } 58 }
58 _sh = this; // ch is static, should be set only once. 59 _sh = this; // ch is static, should be set only once.
59 if ((UseParNewGC || 60 if ((UseParNewGC ||
60 (UseConcMarkSweepGC && CMSParallelRemarkEnabled) || 61 (UseConcMarkSweepGC && CMSParallelRemarkEnabled) ||
61 UseG1GC) && 62 UseG1GC) &&
62 ParallelGCThreads > 0) { 63 ParallelGCThreads > 0) {
63 _workers = new WorkGang("Parallel GC Threads", ParallelGCThreads, 64 _workers = new FlexibleWorkGang("Parallel GC Threads", ParallelGCThreads,
64 /* are_GC_task_threads */true, 65 /* are_GC_task_threads */true,
65 /* are_ConcurrentGC_threads */false); 66 /* are_ConcurrentGC_threads */false);
66 if (_workers == NULL) { 67 if (_workers == NULL) {
67 vm_exit_during_initialization("Failed necessary allocation."); 68 vm_exit_during_initialization("Failed necessary allocation.");
69 } else {
70 _workers->initialize_workers();
68 } 71 }
69 } 72 }
70 } 73 }
71 74
72 bool SharedHeap::heap_lock_held_for_gc() { 75 bool SharedHeap::heap_lock_held_for_gc() {
75 || ( (t->is_GC_task_thread() || t->is_VM_thread()) 78 || ( (t->is_GC_task_thread() || t->is_VM_thread())
76 && _thread_holds_heap_lock_for_gc); 79 && _thread_holds_heap_lock_for_gc);
77 } 80 }
78 81
79 void SharedHeap::set_par_threads(int t) { 82 void SharedHeap::set_par_threads(int t) {
83 assert(t == 0 || !UseSerialGC, "Cannot have parallel threads");
80 _n_par_threads = t; 84 _n_par_threads = t;
81 _process_strong_tasks->set_par_threads(t); 85 _process_strong_tasks->set_n_threads(t);
82 } 86 }
83 87
84 class AssertIsPermClosure: public OopClosure { 88 class AssertIsPermClosure: public OopClosure {
85 public: 89 public:
86 virtual void do_oop(oop* p) { 90 virtual void do_oop(oop* p) {