1 /*
 2  * Copyright (c) 2023, 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  */
24 
25 #ifndef SHARE_CDS_METHOD_PROFILER_HPP
26 #define SHARE_CDS_METHOD_PROFILER_HPP
27 
28 #include "memory/allocation.hpp"
29 #include "utilities/growableArray.hpp"
30 
31 class nmethod;
32 
33 class MethodProfiler {
34   friend class MethodProfilerClosure;
35 
36 private:
37   static volatile uint64_t _num_samples;
38 
39 public:
40   static void initialize();
41   static void tick();
42 
43   static void process_method_hotness();
44 
45   static uint64_t num_samples();
46   static GrowableArrayCHeap<nmethod*, mtClassShared>* sampled_nmethods();
47   static double hotness(nmethod* nm);
48 };
49 
50 #endif // SHARE_CDS_METHOD_PROFILER_HPP