Tue, 19 May 2015 15:49:27 +0200
8061715: gc/g1/TestShrinkAuxiliaryData15.java fails with java.lang.RuntimeException: heap decommit failed - after > before
Summary: added WhiteBox methods to count regions and exact aux data sizes
Reviewed-by: jwilhelm, brutisso
1 /*
2 * Copyright (c) 2001, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 * This code is free software; you can redistribute it and/or modify it
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7 * published by the Free Software Foundation.
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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
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23 */
25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_SATBQUEUE_HPP
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_SATBQUEUE_HPP
28 #include "memory/allocation.hpp"
29 #include "gc_implementation/g1/ptrQueue.hpp"
31 class JavaThread;
32 class SATBMarkQueueSet;
34 // Base class for processing the contents of a SATB buffer.
35 class SATBBufferClosure : public StackObj {
36 protected:
37 ~SATBBufferClosure() { }
39 public:
40 // Process the SATB entries in the designated buffer range.
41 virtual void do_buffer(void** buffer, size_t size) = 0;
42 };
44 // A ptrQueue whose elements are "oops", pointers to object heads.
45 class ObjPtrQueue: public PtrQueue {
46 friend class SATBMarkQueueSet;
48 private:
49 // Filter out unwanted entries from the buffer.
50 void filter();
52 public:
53 ObjPtrQueue(PtrQueueSet* qset, bool perm = false) :
54 // SATB queues are only active during marking cycles. We create
55 // them with their active field set to false. If a thread is
56 // created during a cycle and its SATB queue needs to be activated
57 // before the thread starts running, we'll need to set its active
58 // field to true. This is done in JavaThread::initialize_queues().
59 PtrQueue(qset, perm, false /* active */) { }
61 // Process queue entries and free resources.
62 void flush();
64 // Apply cl to the active part of the buffer.
65 // Prerequisite: Must be at a safepoint.
66 void apply_closure_and_empty(SATBBufferClosure* cl);
68 // Overrides PtrQueue::should_enqueue_buffer(). See the method's
69 // definition for more information.
70 virtual bool should_enqueue_buffer();
72 #ifndef PRODUCT
73 // Helpful for debugging
74 void print(const char* name);
75 static void print(const char* name, void** buf, size_t index, size_t sz);
76 #endif // PRODUCT
77 };
79 class SATBMarkQueueSet: public PtrQueueSet {
80 ObjPtrQueue _shared_satb_queue;
82 #ifdef ASSERT
83 void dump_active_states(bool expected_active);
84 void verify_active_states(bool expected_active);
85 #endif // ASSERT
87 public:
88 SATBMarkQueueSet();
90 void initialize(Monitor* cbl_mon, Mutex* fl_lock,
91 int process_completed_threshold,
92 Mutex* lock);
94 static void handle_zero_index_for_thread(JavaThread* t);
96 // Apply "set_active(active)" to all SATB queues in the set. It should be
97 // called only with the world stopped. The method will assert that the
98 // SATB queues of all threads it visits, as well as the SATB queue
99 // set itself, has an active value same as expected_active.
100 void set_active_all_threads(bool active, bool expected_active);
102 // Filter all the currently-active SATB buffers.
103 void filter_thread_buffers();
105 // If there exists some completed buffer, pop and process it, and
106 // return true. Otherwise return false. Processing a buffer
107 // consists of applying the closure to the buffer range starting
108 // with the first non-NULL entry to the end of the buffer; the
109 // leading entries may be NULL due to filtering.
110 bool apply_closure_to_completed_buffer(SATBBufferClosure* cl);
112 #ifndef PRODUCT
113 // Helpful for debugging
114 void print_all(const char* msg);
115 #endif // PRODUCT
117 ObjPtrQueue* shared_satb_queue() { return &_shared_satb_queue; }
119 // If a marking is being abandoned, reset any unprocessed log buffers.
120 void abandon_partial_marking();
121 };
123 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_SATBQUEUE_HPP