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
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
|
/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2008-2012. All Rights Reserved.
*
* The contents of this file are subject to the Erlang Public License,
* Version 1.1, (the "License"); you may not use this file except in
* compliance with the License. You should have received a copy of the
* Erlang Public License along with this software. If not, it can be
* retrieved online at http://www.erlang.org/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* %CopyrightEnd%
*/
/*
* Description: Statistics for locks.
*
* Author: Bj�rn-Egil Dahlberg
* Date: 2008-07-03
* Abstract:
* Locks statistics internal representation.
*
* Conceptual representation,
* - set name
* | - id (the unique lock)
* | | - lock type
* | | - statistics
* | | | - location (file and line number)
* | | | - tries
* | | | - collisions (including trylock busy)
* | | | - timer (time spent in waiting for lock)
* | | | - n_timer (collisions excluding trylock busy)
*
* Each instance of a lock is the unique lock, i.e. set and id in that set.
* For each lock there is a set of statistics with where and what impact
* the lock aqusition had.
*
* Runtime options
* - suspend, used when internal lock-counting can't be applied. For instance
* when allocating a term for the outside and halloc needs to be used.
* Default: off.
* - location, reserved and not used.
* - proclock, disable proclock counting. Used when performance might be an
* issue. Accessible from erts_debug:lock_counters({process_locks, bool()}).
* Default: off.
* - copysave, enable saving of destroyed locks (and thereby its statistics).
* If memory constraints is an issue this need to be disabled.
* Accessible from erts_debug:lock_counters({copy_save, bool()}).
* Default: off.
*
*/
#include "sys.h"
#ifndef ERTS_LOCK_COUNT_H__
#define ERTS_LOCK_COUNT_H__
#ifdef ERTS_ENABLE_LOCK_COUNT
#include "ethread.h"
#define ERTS_LCNT_MAX_LOCK_LOCATIONS (10)
#define ERTS_LCNT_LT_SPINLOCK (((Uint16) 1) << 0)
#define ERTS_LCNT_LT_RWSPINLOCK (((Uint16) 1) << 1)
#define ERTS_LCNT_LT_MUTEX (((Uint16) 1) << 2)
#define ERTS_LCNT_LT_RWMUTEX (((Uint16) 1) << 3)
#define ERTS_LCNT_LT_PROCLOCK (((Uint16) 1) << 4)
#define ERTS_LCNT_LT_ALLOC (((Uint16) 1) << 5)
#define ERTS_LCNT_LO_READ (((Uint16) 1) << 6)
#define ERTS_LCNT_LO_WRITE (((Uint16) 1) << 7)
#define ERTS_LCNT_LO_READ_WRITE ( ERTS_LCNT_LO_READ \
| ERTS_LCNT_LO_WRITE )
#define ERTS_LCNT_LT_ALL ( ERTS_LCNT_LT_SPINLOCK \
| ERTS_LCNT_LT_RWSPINLOCK \
| ERTS_LCNT_LT_MUTEX \
| ERTS_LCNT_LT_RWMUTEX \
| ERTS_LCNT_LT_PROCLOCK )
/* runtime options */
#define ERTS_LCNT_OPT_SUSPEND (((Uint16) 1) << 0)
#define ERTS_LCNT_OPT_LOCATION (((Uint16) 1) << 1)
#define ERTS_LCNT_OPT_PROCLOCK (((Uint16) 1) << 2)
#define ERTS_LCNT_OPT_COPYSAVE (((Uint16) 1) << 3)
#define ERTS_LCNT_OPT_PORTLOCK (((Uint16) 1) << 4)
typedef struct {
unsigned long s;
unsigned long ns;
} erts_lcnt_time_t;
extern erts_lcnt_time_t timer_start;
typedef struct erts_lcnt_lock_stats_s {
/* "tries" and "colls" needs to be atomic since
* trylock busy does not aquire a lock and there
* is no post action to rectify the situation
*/
char *file; /* which file the lock was taken */
unsigned int line; /* line number in file */
ethr_atomic_t tries; /* n tries to get lock */
ethr_atomic_t colls; /* n collisions of tries to get lock */
unsigned long timer_n; /* #times waited for lock */
erts_lcnt_time_t timer; /* total wait time for lock */
} erts_lcnt_lock_stats_t;
/* rw locks uses both states, other locks only uses w_state */
typedef struct erts_lcnt_lock_s {
char *name; /* lock name */
Uint16 flag; /* lock type */
Eterm id; /* id if possible */
#ifdef DEBUG
ethr_atomic_t flowstate;
#endif
/* lock states */
ethr_atomic_t w_state; /* 0 not taken, otherwise n threads waiting */
ethr_atomic_t r_state; /* 0 not taken, > 0 -> writes will wait */
/* statistics */
unsigned int n_stats;
erts_lcnt_lock_stats_t stats[ERTS_LCNT_MAX_LOCK_LOCATIONS]; /* first entry is "undefined"*/
/* chains for list handling */
/* data is hold by lcnt_lock */
struct erts_lcnt_lock_s *prev;
struct erts_lcnt_lock_s *next;
} erts_lcnt_lock_t;
typedef struct {
erts_lcnt_lock_t *head;
erts_lcnt_lock_t *tail;
unsigned long n;
} erts_lcnt_lock_list_t;
typedef struct {
erts_lcnt_time_t duration; /* time since last clear */
erts_lcnt_lock_list_t *current_locks;
erts_lcnt_lock_list_t *deleted_locks;
} erts_lcnt_data_t;
typedef struct {
int id;
erts_lcnt_time_t timer; /* timer */
int timer_set; /* bool */
int lock_in_conflict; /* bool */
} erts_lcnt_thread_data_t;
/* globals */
extern Uint16 erts_lcnt_rt_options;
/* function declerations */
void erts_lcnt_init(void);
void erts_lcnt_late_init(void);
/* thread operations */
void erts_lcnt_thread_setup(void);
void erts_lcnt_thread_exit_handler(void);
/* list operations (local) */
erts_lcnt_lock_list_t *erts_lcnt_list_init(void);
void erts_lcnt_list_clear( erts_lcnt_lock_list_t *list);
void erts_lcnt_list_insert(erts_lcnt_lock_list_t *list, erts_lcnt_lock_t *lock);
void erts_lcnt_list_delete(erts_lcnt_lock_list_t *list, erts_lcnt_lock_t *lock);
/* lock operations (global) */
void erts_lcnt_init_lock(erts_lcnt_lock_t *lock, char *name, Uint16 flag);
void erts_lcnt_init_lock_x(erts_lcnt_lock_t *lock, char *name, Uint16 flag, Eterm id);
void erts_lcnt_destroy_lock(erts_lcnt_lock_t *lock);
void erts_lcnt_lock(erts_lcnt_lock_t *lock);
void erts_lcnt_lock_opt(erts_lcnt_lock_t *lock, Uint16 option);
void erts_lcnt_lock_post(erts_lcnt_lock_t *lock);
void erts_lcnt_lock_post_x(erts_lcnt_lock_t *lock, char *file, unsigned int line);
void erts_lcnt_lock_unaquire(erts_lcnt_lock_t *lock);
void erts_lcnt_unlock(erts_lcnt_lock_t *lock);
void erts_lcnt_unlock_opt(erts_lcnt_lock_t *lock, Uint16 option);
void erts_lcnt_trylock_opt(erts_lcnt_lock_t *lock, int res, Uint16 option);
void erts_lcnt_trylock(erts_lcnt_lock_t *lock, int res);
/* bif interface */
Uint16 erts_lcnt_set_rt_opt(Uint16 opt);
Uint16 erts_lcnt_clear_rt_opt(Uint16 opt);
void erts_lcnt_clear_counters(void);
char *erts_lcnt_lock_type(Uint16 type);
erts_lcnt_data_t *erts_lcnt_get_data(void);
#define ERTS_LCNT_LOCK_TYPE(lockp) ((lockp)->flag & ERTS_LCNT_LT_ALL)
#endif /* ifdef ERTS_ENABLE_LOCK_COUNT */
#endif /* ifndef ERTS_LOCK_COUNT_H__ */
|
