1 /*
 2  * Copyright (c) 2011, 2017, 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 #include "precompiled.hpp"
26 #include "gc/shared/hSpaceCounters.hpp"
27 #include "memory/allocation.inline.hpp"
28 #include "memory/resourceArea.hpp"
29 #include "runtime/perfData.hpp"
30 
31 HSpaceCounters::HSpaceCounters(const char* name_space,
32                                const char* name,
33                                int ordinal,
34                                size_t max_size,
35                                size_t initial_capacity) {
36 
37   if (UsePerfData) {
38     EXCEPTION_MARK;
39     ResourceMark rm;
40 
41     const char* cns =
42       PerfDataManager::name_space(name_space, "space", ordinal);
43 
44     _name_space = NEW_C_HEAP_ARRAY(char, strlen(cns)+1, mtGC);
45     strcpy(_name_space, cns);
46 
47     const char* cname = PerfDataManager::counter_name(_name_space, "name");
48     PerfDataManager::create_string_constant(SUN_GC, cname, name, CHECK);
49 
50     cname = PerfDataManager::counter_name(_name_space, "maxCapacity");
51     PerfDataManager::create_constant(SUN_GC, cname, PerfData::U_Bytes,
52                                      (jlong)max_size, CHECK);
53 
54     cname = PerfDataManager::counter_name(_name_space, "capacity");
55     _capacity = PerfDataManager::create_variable(SUN_GC, cname,
56                                                  PerfData::U_Bytes,
57                                                  initial_capacity, CHECK);
58 
59     cname = PerfDataManager::counter_name(_name_space, "used");
60     _used = PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes,
61                                              (jlong) 0, CHECK);
62 
63     cname = PerfDataManager::counter_name(_name_space, "initCapacity");
64     PerfDataManager::create_constant(SUN_GC, cname, PerfData::U_Bytes,
65                                      initial_capacity, CHECK);
66   }
67 }
68 
69 HSpaceCounters::~HSpaceCounters() {
70   if (_name_space != NULL) {
71     FREE_C_HEAP_ARRAY(char, _name_space);
72   }
73 }
74 
75 void HSpaceCounters::update_capacity(size_t v) {
76   _capacity->set_value(v);
77 }
78 
79 void HSpaceCounters::update_used(size_t v) {
80   _used->set_value(v);
81 }
82 
83 void HSpaceCounters::update_all(size_t capacity, size_t used) {
84   update_capacity(capacity);
85   update_used(used);
86 }
87 
88 debug_only(
89   // for security reasons, we do not allow arbitrary reads from
90   // the counters as they may live in shared memory.
91   jlong HSpaceCounters::used() {
92     return _used->get_value();
93   }
94   jlong HSpaceCounters::capacity() {
95     return _used->get_value();
96   }
97 )