Sat, 11 Sep 2010 08:18:31 +0200
6765718: Indicate which thread throwing OOME when generating the heap dump at OOME
Summary: Emit a fake frame that makes it look like the thread is in the OutOfMemoryError zero-parameter constructor
Reviewed-by: dcubed
1 /*
2 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
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 */
25 // HeapDumper is used to dump the java heap to file in HPROF binary format:
26 //
27 // { HeapDumper dumper(true /* full GC before heap dump */);
28 // if (dumper.dump("/export/java.hprof")) {
29 // ResourceMark rm;
30 // tty->print_cr("Dump failed: %s", dumper.error_as_C_string());
31 // } else {
32 // // dump succeeded
33 // }
34 // }
35 //
37 class HeapDumper : public StackObj {
38 private:
39 char* _error;
40 bool _print_to_tty;
41 bool _gc_before_heap_dump;
42 bool _oome;
43 elapsedTimer _t;
45 HeapDumper(bool gc_before_heap_dump, bool print_to_tty, bool oome) :
46 _gc_before_heap_dump(gc_before_heap_dump), _error(NULL), _print_to_tty(print_to_tty), _oome(oome) { }
48 // string representation of error
49 char* error() const { return _error; }
50 void set_error(char* error);
52 // indicates if progress messages can be sent to tty
53 bool print_to_tty() const { return _print_to_tty; }
55 // internal timer.
56 elapsedTimer* timer() { return &_t; }
58 static void dump_heap(bool oome);
60 public:
61 HeapDumper(bool gc_before_heap_dump) :
62 _gc_before_heap_dump(gc_before_heap_dump), _error(NULL), _print_to_tty(false), _oome(false) { }
64 ~HeapDumper();
66 // dumps the heap to the specified file, returns 0 if success.
67 int dump(const char* path);
69 // returns error message (resource allocated), or NULL if no error
70 char* error_as_C_string() const;
72 static void dump_heap() KERNEL_RETURN;
74 static void dump_heap_from_oome() KERNEL_RETURN;
75 };