Mercurial > hg > truffle
annotate src/share/vm/runtime/unhandledOops.cpp @ 1711:a6bff45449bc
6973570: OrderAccess::storestore() scales poorly on multi-socket x64 and sparc: cache-line ping-ponging
Summary: volatile store to static variable removed in favour of a volatile store to stack to avoid excessive cache coherency traffic; verified that the volatile store is not elided by any of our current compilers.
Reviewed-by: dholmes, dice, jcoomes, kvn
author | ysr |
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date | Tue, 10 Aug 2010 14:53:35 -0700 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
rev | line source |
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0 | 1 /* |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 # include "incls/_precompiled.incl" | |
26 # include "incls/_unhandledOops.cpp.incl" | |
27 | |
28 #ifdef CHECK_UNHANDLED_OOPS | |
29 const int free_list_size = 256; | |
30 | |
31 | |
32 UnhandledOops::UnhandledOops(Thread* thread) { | |
33 _thread = thread; | |
34 _oop_list = new (ResourceObj::C_HEAP) | |
35 GrowableArray<UnhandledOopEntry>(free_list_size, true); | |
36 _level = 0; | |
37 } | |
38 | |
39 UnhandledOops::~UnhandledOops() { | |
40 delete _oop_list; | |
41 } | |
42 | |
43 | |
44 void UnhandledOops::dump_oops(UnhandledOops *list) { | |
45 for (int k = 0; k < list->_oop_list->length(); k++) { | |
46 UnhandledOopEntry entry = list->_oop_list->at(k); | |
47 tty->print(" " INTPTR_FORMAT, entry._oop_ptr); | |
48 } | |
49 tty->cr(); | |
50 } | |
51 | |
52 // For debugging unhandled oop detector _in the debugger_ | |
53 // You don't want to turn it on in compiled code here. | |
54 static bool unhandled_oop_print=0; | |
55 | |
56 void UnhandledOops::register_unhandled_oop(oop* op, address pc) { | |
57 if (!_thread->is_in_stack((address)op)) | |
58 return; | |
59 | |
60 _level ++; | |
61 if (unhandled_oop_print) { | |
62 for (int i=0; i<_level; i++) tty->print(" "); | |
63 tty->print_cr("r " INTPTR_FORMAT, op); | |
64 } | |
65 UnhandledOopEntry entry(op, pc); | |
66 _oop_list->push(entry); | |
67 } | |
68 | |
69 | |
70 bool match_oop_entry(void *op, UnhandledOopEntry e) { | |
71 return (e.oop_ptr() == op); | |
72 } | |
73 | |
74 // Mark unhandled oop as okay for GC - the containing struct has an oops_do and | |
75 // for some reason the oop has to be on the stack. | |
76 // May not be called for the current thread, as in the case of | |
77 // VM_GetOrSetLocal in jvmti. | |
78 void UnhandledOops::allow_unhandled_oop(oop* op) { | |
79 assert (CheckUnhandledOops, "should only be called with checking option"); | |
80 | |
81 int i = _oop_list->find_at_end(op, match_oop_entry); | |
82 assert(i!=-1, "safe for gc oop not in unhandled_oop_list"); | |
83 | |
84 UnhandledOopEntry entry = _oop_list->at(i); | |
85 assert(!entry._ok_for_gc, "duplicate entry"); | |
86 entry._ok_for_gc = true; | |
87 _oop_list->at_put(i, entry); | |
88 } | |
89 | |
90 | |
91 // Called by the oop destructor to remove unhandled oop from the thread's | |
92 // oop list. All oops given are assumed to be on the list. If not, | |
93 // there's a bug in the unhandled oop detector. | |
94 void UnhandledOops::unregister_unhandled_oop(oop* op) { | |
95 if (!_thread->is_in_stack((address)op)) return; | |
96 | |
97 _level --; | |
98 if (unhandled_oop_print) { | |
99 for (int i=0; i<_level; i++) tty->print(" "); | |
100 tty->print_cr("u "INTPTR_FORMAT, op); | |
101 } | |
102 | |
103 int i = _oop_list->find_at_end(op, match_oop_entry); | |
104 assert(i!=-1, "oop not in unhandled_oop_list"); | |
105 _oop_list->remove_at(i); | |
106 } | |
107 | |
108 void UnhandledOops::clear_unhandled_oops() { | |
109 assert (CheckUnhandledOops, "should only be called with checking option"); | |
110 if (_thread->is_gc_locked_out()) { | |
111 return; | |
112 } | |
113 for (int k = 0; k < _oop_list->length(); k++) { | |
114 UnhandledOopEntry entry = _oop_list->at(k); | |
115 // If an entry is on the unhandled oop list but isn't on the stack | |
116 // anymore, it must not have gotten unregistered properly and it's a bug | |
117 // in the unhandled oop generator. | |
118 if(!_thread->is_in_stack((address)entry._oop_ptr)) { | |
119 tty->print_cr("oop_ptr is " INTPTR_FORMAT, (address)entry._oop_ptr); | |
120 tty->print_cr("thread is " INTPTR_FORMAT " from pc " INTPTR_FORMAT, | |
121 (address)_thread, (address)entry._pc); | |
122 assert(false, "heap is corrupted by the unhandled oop detector"); | |
123 } | |
124 // Set unhandled oops to a pattern that will crash distinctively | |
125 if (!entry._ok_for_gc) *(intptr_t*)(entry._oop_ptr) = BAD_OOP_ADDR; | |
126 } | |
127 } | |
128 #endif // CHECK_UNHANDLED_OOPS |