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
/* Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA */
/**
@file storage/perfschema/pfs_events_waits.cc
Events waits data structures (implementation).
*/
#include "my_global.h"
#include "my_sys.h"
#include "pfs_global.h"
#include "pfs_instr.h"
#include "pfs_events_waits.h"
#include "pfs_atomic.h"
#include "m_string.h"
ulong events_waits_history_long_size= 0;
/** Consumer flag for table EVENTS_WAITS_CURRENT. */
bool flag_events_waits_current= true;
/** Consumer flag for table EVENTS_WAITS_HISTORY. */
bool flag_events_waits_history= true;
/** Consumer flag for table EVENTS_WAITS_HISTORY_LONG. */
bool flag_events_waits_history_long= true;
/** Consumer flag for table EVENTS_WAITS_SUMMARY_BY_THREAD_BY_EVENT_NAME. */
bool flag_events_waits_summary_by_thread_by_event_name= true;
/** Consumer flag for table EVENTS_WAITS_SUMMARY_BY_EVENT_NAME. */
bool flag_events_waits_summary_by_event_name= true;
/** Consumer flag for table EVENTS_WAITS_SUMMARY_BY_INSTANCE. */
bool flag_events_waits_summary_by_instance= true;
bool flag_events_locks_summary_by_event_name= true;
bool flag_events_locks_summary_by_instance= true;
/** Consumer flag for table FILE_SUMMARY_BY_EVENT_NAME. */
bool flag_file_summary_by_event_name= true;
/** Consumer flag for table FILE_SUMMARY_BY_INSTANCE. */
bool flag_file_summary_by_instance= true;
/** True if EVENTS_WAITS_HISTORY_LONG circular buffer is full. */
bool events_waits_history_long_full= false;
/** Index in EVENTS_WAITS_HISTORY_LONG circular buffer. */
volatile uint32 events_waits_history_long_index= 0;
/** EVENTS_WAITS_HISTORY_LONG circular buffer. */
PFS_events_waits *events_waits_history_long_array= NULL;
/**
Initialize table EVENTS_WAITS_HISTORY_LONG.
@param events_waits_history_long_sizing table sizing
*/
int init_events_waits_history_long(uint events_waits_history_long_sizing)
{
events_waits_history_long_size= events_waits_history_long_sizing;
events_waits_history_long_full= false;
PFS_atomic::store_u32(&events_waits_history_long_index, 0);
if (events_waits_history_long_size == 0)
return 0;
events_waits_history_long_array=
PFS_MALLOC_ARRAY(events_waits_history_long_size, PFS_events_waits,
MYF(MY_ZEROFILL));
return (events_waits_history_long_array ? 0 : 1);
}
/** Cleanup table EVENTS_WAITS_HISTORY_LONG. */
void cleanup_events_waits_history_long(void)
{
pfs_free(events_waits_history_long_array);
events_waits_history_long_array= NULL;
}
static void copy_events_waits(PFS_events_waits *dest,
const PFS_events_waits *source)
{
/* m_wait_class must be the first member of PFS_events_waits. */
compile_time_assert(offsetof(PFS_events_waits, m_wait_class) == 0);
char* dest_body= (reinterpret_cast<char*> (dest)) + sizeof(events_waits_class);
const char* source_body= (reinterpret_cast<const char*> (source))
+ sizeof(events_waits_class);
/* See comments in table_events_waits_common::make_row(). */
/* Signal readers they are about to read garbage ... */
dest->m_wait_class= NO_WAIT_CLASS;
/* ... that this can generate. */
memcpy_fixed(dest_body,
source_body,
sizeof(PFS_events_waits) - sizeof(events_waits_class));
/* Signal readers the record is now clean again. */
dest->m_wait_class= source->m_wait_class;
}
/**
Insert a wait record in table EVENTS_WAITS_HISTORY.
@param thread thread that executed the wait
@param wait record to insert
*/
void insert_events_waits_history(PFS_thread *thread, PFS_events_waits *wait)
{
uint index= thread->m_waits_history_index;
/*
A concurrent thread executing TRUNCATE TABLE EVENTS_WAITS_CURRENT
could alter the data that this thread is inserting,
causing a potential race condition.
We are not testing for this and insert a possibly empty record,
to make this thread (the writer) faster.
This is ok, the truncated data will have
wait->m_wait_class == NO_WAIT_CLASS,
which readers of m_waits_history will filter out.
*/
copy_events_waits(&thread->m_waits_history[index], wait);
index++;
if (index >= events_waits_history_per_thread)
{
index= 0;
thread->m_waits_history_full= true;
}
thread->m_waits_history_index= index;
}
/**
Insert a wait record in table EVENTS_WAITS_HISTORY_LONG.
@param wait record to insert
*/
void insert_events_waits_history_long(PFS_events_waits *wait)
{
uint index= PFS_atomic::add_u32(&events_waits_history_long_index, 1);
index= index % events_waits_history_long_size;
if (index == 0)
events_waits_history_long_full= true;
/* See related comment in insert_events_waits_history. */
copy_events_waits(&events_waits_history_long_array[index], wait);
}
/** Reset table EVENTS_WAITS_CURRENT data. */
void reset_events_waits_current(void)
{
PFS_thread *pfs_thread= thread_array;
PFS_thread *pfs_thread_last= thread_array + thread_max;
for ( ; pfs_thread < pfs_thread_last; pfs_thread++)
{
PFS_wait_locker *locker= pfs_thread->m_wait_locker_stack;
PFS_wait_locker *locker_last= locker + LOCKER_STACK_SIZE;
for ( ; locker < locker_last; locker++)
locker->m_waits_current.m_wait_class= NO_WAIT_CLASS;
}
}
/** Reset table EVENTS_WAITS_HISTORY data. */
void reset_events_waits_history(void)
{
PFS_thread *pfs_thread= thread_array;
PFS_thread *pfs_thread_last= thread_array + thread_max;
for ( ; pfs_thread < pfs_thread_last; pfs_thread++)
{
PFS_events_waits *wait= pfs_thread->m_waits_history;
PFS_events_waits *wait_last= wait + events_waits_history_per_thread;
pfs_thread->m_waits_history_index= 0;
pfs_thread->m_waits_history_full= false;
for ( ; wait < wait_last; wait++)
wait->m_wait_class= NO_WAIT_CLASS;
}
}
/** Reset table EVENTS_WAITS_HISTORY_LONG data. */
void reset_events_waits_history_long(void)
{
PFS_atomic::store_u32(&events_waits_history_long_index, 0);
events_waits_history_long_full= false;
PFS_events_waits *wait= events_waits_history_long_array;
PFS_events_waits *wait_last= wait + events_waits_history_long_size;
for ( ; wait < wait_last; wait++)
wait->m_wait_class= NO_WAIT_CLASS;
}