1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
|
/* Copyright 2013 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects
* for all of the code used other than as permitted herein. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you do not
* wish to do so, delete this exception statement from your version. If you
* delete this exception statement from all source files in the program,
* then also delete it in the license file.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kDefault
#include "mongo/platform/basic.h"
#include <third_party/gperftools-2.2/src/gperftools/malloc_extension.h>
#include "mongo/base/init.h"
#include "mongo/db/commands/server_status.h"
#include "mongo/util/concurrency/synchronization.h"
#include "mongo/util/log.h"
#include "mongo/util/net/listen.h"
namespace mongo {
namespace {
// If many clients are used, the per-thread caches become smaller and chances of
// rebalancing of free space during critical sections increases. In such situations,
// it is better to release memory when it is likely the thread will be blocked for
// a long time.
const int kManyClients = 40;
boost::mutex tcmallocCleanupLock;
/**
* Callback to allow TCMalloc to release freed memory to the central list at
* favorable times. Ideally would do some milder cleanup or scavenge...
*/
void threadStateChange() {
if (Listener::globalTicketHolder.used() <= kManyClients) {
return;
}
size_t threadCacheSizeBytes = MallocExtension::instance()->GetThreadCacheSize();
static const size_t kMaxThreadCacheSizeBytes = 0x10000;
if (threadCacheSizeBytes < kMaxThreadCacheSizeBytes) {
// This number was chosen a bit magically.
// At 1000 threads and the current (64mb) thread local cache size, we're "full".
// So we may want this number to scale with the number of current clients.
return;
}
LOG(1) << "thread over memory limit, cleaning up, current: "
<< (threadCacheSizeBytes/1024) << "k";
// We synchronize as the tcmalloc central list uses a spinlock, and we can cause a really
// terrible runaway if we're not careful.
boost::mutex::scoped_lock lk(tcmallocCleanupLock);
MallocExtension::instance()->MarkThreadIdle();
MallocExtension::instance()->MarkThreadBusy();
}
// Register threadStateChange callback
MONGO_INITIALIZER(TCMallocThreadIdleListener)(InitializerContext*) {
registerThreadIdleCallback(&threadStateChange);
return Status::OK();
}
class TCMallocServerStatusSection : public ServerStatusSection {
public:
TCMallocServerStatusSection() : ServerStatusSection("tcmalloc") {}
virtual bool includeByDefault() const { return false; }
virtual BSONObj generateSection(OperationContext* txn,
const BSONElement& configElement) const {
BSONObjBuilder builder;
// For a list of properties see the "Generic Tcmalloc Status" section of
// http://google-perftools.googlecode.com/svn/trunk/doc/tcmalloc.html and
// http://code.google.com/p/gperftools/source/browse/src/gperftools/malloc_extension.h
{
BSONObjBuilder sub(builder.subobjStart("generic"));
appendNumericPropertyIfAvailable(sub, "current_allocated_bytes",
"generic.current_allocated_bytes");
appendNumericPropertyIfAvailable(sub, "heap_size",
"generic.heap_size");
}
{
BSONObjBuilder sub(builder.subobjStart("tcmalloc"));
appendNumericPropertyIfAvailable(sub, "pageheap_free_bytes",
"tcmalloc.pageheap_free_bytes");
appendNumericPropertyIfAvailable(sub, "pageheap_unmapped_bytes",
"tcmalloc.pageheap_unmapped_bytes");
appendNumericPropertyIfAvailable(sub, "max_total_thread_cache_bytes",
"tcmalloc.max_total_thread_cache_bytes");
appendNumericPropertyIfAvailable(sub, "current_total_thread_cache_bytes",
"tcmalloc.current_total_thread_cache_bytes");
// Not including tcmalloc.slack_bytes since it is deprecated.
appendNumericPropertyIfAvailable(sub, "central_cache_free_bytes",
"tcmalloc.central_cache_free_bytes");
appendNumericPropertyIfAvailable(sub, "transfer_cache_free_bytes",
"tcmalloc.transfer_cache_free_bytes");
appendNumericPropertyIfAvailable(sub, "thread_cache_free_bytes",
"tcmalloc.thread_cache_free_bytes");
appendNumericPropertyIfAvailable(sub, "aggressive_memory_decommit",
"tcmalloc.aggressive_memory_decommit");
}
char buffer[4096];
MallocExtension::instance()->GetStats(buffer, sizeof(buffer));
builder.append("formattedString", buffer);
return builder.obj();
}
private:
static void appendNumericPropertyIfAvailable(BSONObjBuilder& builder,
StringData bsonName,
const char* property) {
size_t value;
if (MallocExtension::instance()->GetNumericProperty(property, &value))
builder.appendNumber(bsonName, value);
}
} tcmallocServerStatusSection;
}
}
|
