1
/*****************************************************************************
3
Copyright (c) 1995, 2010, Innobase Oy. All Rights Reserved.
4
Copyright (c) 2008, 2009 Google Inc.
5
Copyright (c) 2009, Percona Inc.
7
Portions of this file contain modifications contributed and copyrighted by
8
Google, Inc. Those modifications are gratefully acknowledged and are described
9
briefly in the InnoDB documentation. The contributions by Google are
10
incorporated with their permission, and subject to the conditions contained in
11
the file COPYING.Google.
13
Portions of this file contain modifications contributed and copyrighted
14
by Percona Inc.. Those modifications are
15
gratefully acknowledged and are described briefly in the InnoDB
16
documentation. The contributions by Percona Inc. are incorporated with
17
their permission, and subject to the conditions contained in the file
20
This program is free software; you can redistribute it and/or modify it under
21
the terms of the GNU General Public License as published by the Free Software
22
Foundation; version 2 of the License.
24
This program is distributed in the hope that it will be useful, but WITHOUT
25
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
26
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
28
You should have received a copy of the GNU General Public License along with
29
this program; if not, write to the Free Software Foundation, Inc., 51 Franklin
30
St, Fifth Floor, Boston, MA 02110-1301 USA
32
*****************************************************************************/
34
/**************************************************//**
1
/******************************************************
36
2
The database server main program
38
4
NOTE: SQL Server 7 uses something which the documentation
100
67
in microseconds, in order to reduce the lagging of the purge thread. */
101
68
UNIV_INTERN ulint srv_dml_needed_delay = 0;
103
UNIV_INTERN ibool srv_lock_timeout_active = FALSE;
104
UNIV_INTERN ibool srv_monitor_active = FALSE;
70
UNIV_INTERN ibool srv_lock_timeout_and_monitor_active = FALSE;
105
71
UNIV_INTERN ibool srv_error_monitor_active = FALSE;
107
73
UNIV_INTERN const char* srv_main_thread_op_info = "";
109
/** Prefix used by MySQL to indicate pre-5.1 table name encoding */
75
/* Prefix used by MySQL to indicate pre-5.1 table name encoding */
110
76
UNIV_INTERN const char srv_mysql50_table_name_prefix[9] = "#mysql50#";
112
78
/* Server parameters which are read from the initfile */
119
85
UNIV_INTERN char* srv_arch_dir = NULL;
120
86
#endif /* UNIV_LOG_ARCHIVE */
122
/** store to its own file each table created by an user; data
88
/* store to its own file each table created by an user; data
123
89
dictionary tables are in the system tablespace 0 */
124
90
UNIV_INTERN my_bool srv_file_per_table;
125
/** The file format to use on new *.ibd files. */
91
/* The file format to use on new *.ibd files. */
126
92
UNIV_INTERN ulint srv_file_format = 0;
127
/** Whether to check file format during startup. A value of
93
/* Whether to check file format during startup a value of
128
94
DICT_TF_FORMAT_MAX + 1 means no checking ie. FALSE. The default is to
129
95
set it to the highest format we support. */
130
UNIV_INTERN ulint srv_max_file_format_at_startup = DICT_TF_FORMAT_MAX;
96
UNIV_INTERN ulint srv_check_file_format_at_startup = DICT_TF_FORMAT_MAX;
132
98
#if DICT_TF_FORMAT_51
133
99
# error "DICT_TF_FORMAT_51 must be 0!"
135
/** Place locks to records only i.e. do not use next-key locking except
101
/* Place locks to records only i.e. do not use next-key locking except
136
102
on duplicate key checking and foreign key checking */
137
103
UNIV_INTERN ibool srv_locks_unsafe_for_binlog = FALSE;
139
/* If this flag is TRUE, then we will use the native aio of the
140
OS (provided we compiled Innobase with it in), otherwise we will
141
use simulated aio we build below with threads.
142
Currently we support native aio on windows and linux */
143
UNIV_INTERN my_bool srv_use_native_aio = TRUE;
146
/* Windows native condition variables. We use runtime loading / function
147
pointers, because they are not available on Windows Server 2003 and
150
We use condition for events on Windows if possible, even if os_event
151
resembles Windows kernel event object well API-wise. The reason is
152
performance, kernel objects are heavyweights and WaitForSingleObject() is a
153
performance killer causing calling thread to context switch. Besides, Innodb
154
is preallocating large number (often millions) of os_events. With kernel event
155
objects it takes a big chunk out of non-paged pool, which is better suited
156
for tasks like IO than for storing idle event objects. */
157
UNIV_INTERN ibool srv_use_native_conditions = FALSE;
160
105
UNIV_INTERN ulint srv_n_data_files = 0;
161
106
UNIV_INTERN char** srv_data_file_names = NULL;
162
107
/* size in database pages */
187
132
UNIV_INTERN ulint srv_log_buffer_size = ULINT_MAX;
188
133
UNIV_INTERN ulong srv_flush_log_at_trx_commit = 1;
190
/* Try to flush dirty pages so as to avoid IO bursts at
192
UNIV_INTERN bool srv_adaptive_flushing = TRUE;
194
/** Maximum number of times allowed to conditionally acquire
195
mutex before switching to blocking wait on the mutex */
196
#define MAX_MUTEX_NOWAIT 20
198
/** Check whether the number of failed nonblocking mutex
199
acquisition attempts exceeds maximum allowed value. If so,
200
srv_printf_innodb_monitor() will request mutex acquisition
201
with mutex_enter(), which will wait until it gets the mutex. */
202
#define MUTEX_NOWAIT(mutex_skipped) ((mutex_skipped) < MAX_MUTEX_NOWAIT)
204
/** The sort order table of the MySQL latin1_swedish_ci character set
135
/* The sort order table of the MySQL latin1_swedish_ci character set
206
#if defined(BUILD_DRIZZLE)
207
137
UNIV_INTERN const byte srv_latin1_ordering[256] /* The sort order table of the latin1
208
138
character set. The following table is
209
139
the MySQL order as of Feb 10th, 2002 */
241
171
, 0x44, 0x4E, 0x4F, 0x4F, 0x4F, 0x4F, 0x5D, 0xF7
242
172
, 0xD8, 0x55, 0x55, 0x55, 0x59, 0x59, 0xDE, 0xFF
245
UNIV_INTERN const byte* srv_latin1_ordering;
246
#endif /* BUILD_DRIZZLE */
249
/* use os/external memory allocator */
250
UNIV_INTERN my_bool srv_use_sys_malloc = TRUE;
251
176
/* requested size in kilobytes */
252
UNIV_INTERN ulint srv_buf_pool_size = ULINT_MAX;
253
/* requested number of buffer pool instances */
254
UNIV_INTERN ulint srv_buf_pool_instances = 1;
177
UNIV_INTERN ulong srv_buf_pool_size = ULINT_MAX;
255
178
/* previously requested size */
256
UNIV_INTERN ulint srv_buf_pool_old_size;
179
UNIV_INTERN ulong srv_buf_pool_old_size;
257
180
/* current size in kilobytes */
258
UNIV_INTERN ulint srv_buf_pool_curr_size = 0;
181
UNIV_INTERN ulong srv_buf_pool_curr_size = 0;
259
182
/* size in bytes */
260
183
UNIV_INTERN ulint srv_mem_pool_size = ULINT_MAX;
261
184
UNIV_INTERN ulint srv_lock_table_size = ULINT_MAX;
263
/* This parameter is deprecated. Use srv_n_io_[read|write]_threads
265
186
UNIV_INTERN ulint srv_n_file_io_threads = ULINT_MAX;
266
UNIV_INTERN ulint srv_n_read_io_threads = ULINT_MAX;
267
UNIV_INTERN ulint srv_n_write_io_threads = ULINT_MAX;
269
/* User settable value of the number of pages that must be present
270
in the buffer cache and accessed sequentially for InnoDB to trigger a
271
readahead request. */
272
UNIV_INTERN ulong srv_read_ahead_threshold = 56;
274
188
#ifdef UNIV_LOG_ARCHIVE
275
189
UNIV_INTERN ibool srv_log_archive_on = FALSE;
294
208
UNIV_INTERN ulint srv_max_n_open_files = 300;
296
/* Number of IO operations per second the server can do */
297
UNIV_INTERN ulong srv_io_capacity = 200;
299
210
/* The InnoDB main thread tries to keep the ratio of modified pages
300
211
in the buffer pool to all database pages in the buffer pool smaller than
301
212
the following number. But it is not guaranteed that the value stays below
302
213
that during a time of heavy update/insert activity. */
304
UNIV_INTERN ulong srv_max_buf_pool_modified_pct = 75;
306
/* the number of purge threads to use from the worker pool (currently 0 or 1).*/
307
UNIV_INTERN ulong srv_n_purge_threads = 0;
309
/* the number of records to purge in one batch */
310
UNIV_INTERN ulong srv_purge_batch_size = 20;
215
UNIV_INTERN ulong srv_max_buf_pool_modified_pct = 90;
312
217
/* variable counts amount of data read in total (in bytes) */
313
218
UNIV_INTERN ulint srv_data_read = 0;
351
256
pool to the disk */
352
257
UNIV_INTERN ulint srv_buf_pool_flushed = 0;
354
/** Number of buffer pool reads that led to the
259
/* variable to count the number of buffer pool reads that led to the
355
260
reading of a disk page */
356
261
UNIV_INTERN ulint srv_buf_pool_reads = 0;
263
/* variable to count the number of sequential read-aheads */
264
UNIV_INTERN ulint srv_read_ahead_seq = 0;
266
/* variable to count the number of random read-aheads */
267
UNIV_INTERN ulint srv_read_ahead_rnd = 0;
358
269
/* structure to pass status variables to MySQL */
359
270
UNIV_INTERN export_struc export_vars;
378
289
concurrency check. */
380
291
UNIV_INTERN ulong srv_thread_concurrency = 0;
292
UNIV_INTERN ulong srv_commit_concurrency = 0;
382
294
/* this mutex protects srv_conc data structures */
383
295
UNIV_INTERN os_fast_mutex_t srv_conc_mutex;
384
/* number of transactions that have declared_to_be_inside_innodb set.
385
It used to be a non-error for this value to drop below zero temporarily.
386
This is no longer true. We'll, however, keep the lint datatype to add
387
assertions to catch any corner cases that we may have missed. */
296
/* number of OS threads currently inside InnoDB; it is not an error if
297
this drops temporarily below zero because we do not demand that every
298
thread increments this, but a thread waiting for a lock decrements
388
300
UNIV_INTERN lint srv_conc_n_threads = 0;
389
301
/* number of OS threads waiting in the FIFO for a permission to enter
393
305
typedef struct srv_conc_slot_struct srv_conc_slot_t;
394
306
struct srv_conc_slot_struct{
395
os_event_t event; /*!< event to wait */
396
ibool reserved; /*!< TRUE if slot
307
os_event_t event; /* event to wait */
308
ibool reserved; /* TRUE if slot
398
ibool wait_ended; /*!< TRUE when another
310
ibool wait_ended; /* TRUE when another
399
311
thread has already set
400
312
the event and the
401
313
thread in this slot is
402
314
free to proceed; but
403
315
reserved may still be
404
316
TRUE at that point */
405
UT_LIST_NODE_T(srv_conc_slot_t) srv_conc_queue; /*!< queue node */
317
UT_LIST_NODE_T(srv_conc_slot_t) srv_conc_queue; /* queue node */
408
320
/* queue of threads waiting to get in */
431
343
UNIV_INTERN ibool srv_use_doublewrite_buf = TRUE;
432
344
UNIV_INTERN ibool srv_use_checksums = TRUE;
346
UNIV_INTERN ibool srv_set_thread_priorities = TRUE;
347
UNIV_INTERN int srv_query_thread_priority = 0;
434
349
UNIV_INTERN ulong srv_replication_delay = 0;
436
351
/*-------------------------------------------*/
437
UNIV_INTERN ulong srv_n_spin_wait_rounds = 30;
352
UNIV_INTERN ulong srv_n_spin_wait_rounds = 20;
438
353
UNIV_INTERN ulong srv_n_free_tickets_to_enter = 500;
439
354
UNIV_INTERN ulong srv_thread_sleep_delay = 10000;
440
UNIV_INTERN ulong srv_spin_wait_delay = 6;
355
UNIV_INTERN ulint srv_spin_wait_delay = 5;
441
356
UNIV_INTERN ibool srv_priority_boost = TRUE;
443
358
#ifdef UNIV_DEBUG
452
367
UNIV_INTERN ulint srv_n_rows_updated = 0;
453
368
UNIV_INTERN ulint srv_n_rows_deleted = 0;
454
369
UNIV_INTERN ulint srv_n_rows_read = 0;
370
#ifndef UNIV_HOTBACKUP
456
371
static ulint srv_n_rows_inserted_old = 0;
457
372
static ulint srv_n_rows_updated_old = 0;
458
373
static ulint srv_n_rows_deleted_old = 0;
459
374
static ulint srv_n_rows_read_old = 0;
375
#endif /* !UNIV_HOTBACKUP */
461
377
UNIV_INTERN ulint srv_n_lock_wait_count = 0;
462
378
UNIV_INTERN ulint srv_n_lock_wait_current_count = 0;
463
379
UNIV_INTERN ib_int64_t srv_n_lock_wait_time = 0;
464
380
UNIV_INTERN ulint srv_n_lock_max_wait_time = 0;
466
UNIV_INTERN ulint srv_truncated_status_writes = 0;
469
384
Set the following to 0 if you want InnoDB to write messages on
488
403
/* Mutex for locking srv_monitor_file */
489
404
UNIV_INTERN mutex_t srv_monitor_file_mutex;
491
#ifdef UNIV_PFS_MUTEX
492
/* Key to register kernel_mutex with performance schema */
493
UNIV_INTERN mysql_pfs_key_t kernel_mutex_key;
494
/* Key to register srv_innodb_monitor_mutex with performance schema */
495
UNIV_INTERN mysql_pfs_key_t srv_innodb_monitor_mutex_key;
496
/* Key to register srv_monitor_file_mutex with performance schema */
497
UNIV_INTERN mysql_pfs_key_t srv_monitor_file_mutex_key;
498
/* Key to register srv_dict_tmpfile_mutex with performance schema */
499
UNIV_INTERN mysql_pfs_key_t srv_dict_tmpfile_mutex_key;
500
/* Key to register the mutex with performance schema */
501
UNIV_INTERN mysql_pfs_key_t srv_misc_tmpfile_mutex_key;
502
#endif /* UNIV_PFS_MUTEX */
504
405
/* Temporary file for innodb monitor output */
505
406
UNIV_INTERN FILE* srv_monitor_file;
506
407
/* Mutex for locking srv_dict_tmpfile.
519
420
UNIV_INTERN ulint srv_main_thread_process_no = 0;
520
421
UNIV_INTERN ulint srv_main_thread_id = 0;
522
/* The following count work done by srv_master_thread. */
524
/* Iterations by the 'once per second' loop. */
525
static ulint srv_main_1_second_loops = 0;
526
/* Calls to sleep by the 'once per second' loop. */
527
static ulint srv_main_sleeps = 0;
528
/* Iterations by the 'once per 10 seconds' loop. */
529
static ulint srv_main_10_second_loops = 0;
530
/* Iterations of the loop bounded by the 'background_loop' label. */
531
static ulint srv_main_background_loops = 0;
532
/* Iterations of the loop bounded by the 'flush_loop' label. */
533
static ulint srv_main_flush_loops = 0;
534
/* Log writes involving flush. */
535
static ulint srv_log_writes_and_flush = 0;
537
/* This is only ever touched by the master thread. It records the
538
time when the last flush of log file has happened. The master
539
thread ensures that we flush the log files at least once per
541
static time_t srv_last_log_flush_time;
543
/* The master thread performs various tasks based on the current
544
state of IO activity and the level of IO utilization is past
545
intervals. Following macros define thresholds for these conditions. */
546
#define SRV_PEND_IO_THRESHOLD (PCT_IO(3))
547
#define SRV_RECENT_IO_ACTIVITY (PCT_IO(5))
548
#define SRV_PAST_IO_ACTIVITY (PCT_IO(200))
551
424
IMPLEMENTATION OF THE SERVER MAIN PROGRAM
552
425
=========================================
718
591
/* Thread slot in the thread table */
719
592
struct srv_slot_struct{
720
os_thread_id_t id; /*!< thread id */
721
os_thread_t handle; /*!< thread handle */
722
unsigned type:3; /*!< thread type: user, utility etc. */
723
unsigned in_use:1; /*!< TRUE if this slot is in use */
724
unsigned suspended:1; /*!< TRUE if the thread is waiting
593
os_thread_id_t id; /* thread id */
594
os_thread_t handle; /* thread handle */
595
unsigned type:3; /* thread type: user, utility etc. */
596
unsigned in_use:1; /* TRUE if this slot is in use */
597
unsigned suspended:1; /* TRUE if the thread is waiting
725
598
for the event of this slot */
726
ib_time_t suspend_time; /*!< time when the thread was
599
ib_time_t suspend_time; /* time when the thread was
728
os_event_t event; /*!< event used in suspending the
601
os_event_t event; /* event used in suspending the
729
602
thread when it has nothing to do */
730
que_thr_t* thr; /*!< suspended query thread (only
603
que_thr_t* thr; /* suspended query thread (only
731
604
used for MySQL threads) */
761
634
static ulint srv_meter_foreground[SRV_MASTER + 1];
764
/***********************************************************************
765
Prints counters for work done by srv_master_thread. */
768
srv_print_master_thread_info(
769
/*=========================*/
770
FILE *file) /* in: output stream */
772
fprintf(file, "srv_master_thread loops: %lu 1_second, %lu sleeps, "
773
"%lu 10_second, %lu background, %lu flush\n",
774
srv_main_1_second_loops, srv_main_sleeps,
775
srv_main_10_second_loops, srv_main_background_loops,
776
srv_main_flush_loops);
777
fprintf(file, "srv_master_thread log flush and writes: %lu\n",
778
srv_log_writes_and_flush);
781
637
/* The following values give info about the activity going on in
782
638
the database. They are protected by the server mutex. The arrays
783
639
are indexed by the type of the thread. */
785
641
UNIV_INTERN ulint srv_n_threads_active[SRV_MASTER + 1];
786
642
UNIV_INTERN ulint srv_n_threads[SRV_MASTER + 1];
788
/*********************************************************************//**
644
/*************************************************************************
789
645
Sets the info describing an i/o thread current state. */
792
648
srv_set_io_thread_op_info(
793
649
/*======================*/
794
ulint i, /*!< in: the 'segment' of the i/o thread */
795
const char* str) /*!< in: constant char string describing the
650
ulint i, /* in: the 'segment' of the i/o thread */
651
const char* str) /* in: constant char string describing the
798
654
ut_a(i < SRV_MAX_N_IO_THREADS);
800
656
srv_io_thread_op_info[i] = str;
803
/*********************************************************************//**
659
/*************************************************************************
804
660
Accessor function to get pointer to n'th slot in the server thread
806
@return pointer to the slot */
809
664
srv_table_get_nth_slot(
810
665
/*===================*/
811
ulint index) /*!< in: index of the slot */
666
/* out: pointer to the slot */
667
ulint index) /* in: index of the slot */
813
669
ut_a(index < OS_THREAD_MAX_N);
815
671
return(srv_sys->threads + index);
818
/*********************************************************************//**
819
Gets the number of threads in the system.
820
@return sum of srv_n_threads[] */
674
#ifndef UNIV_HOTBACKUP
675
/*************************************************************************
676
Gets the number of threads in the system. */
823
679
srv_get_n_threads(void)
838
694
return(n_threads);
841
/*********************************************************************//**
697
/*************************************************************************
842
698
Reserves a slot in the thread table for the current thread. Also creates the
843
699
thread local storage struct for the current thread. NOTE! The server mutex
844
has to be reserved by the caller!
845
@return reserved slot index */
700
has to be reserved by the caller! */
848
703
srv_table_reserve_slot(
849
704
/*===================*/
850
enum srv_thread_type type) /*!< in: type of the thread */
705
/* out: reserved slot index */
706
enum srv_thread_type type) /* in: type of the thread */
852
708
srv_slot_t* slot;
780
#endif /* !UNIV_HOTBACKUP */
925
/*********************************************************************//**
782
/*************************************************************************
926
783
Releases threads of the type given from suspension in the thread table.
927
NOTE! The server mutex has to be reserved by the caller!
928
@return number of threads released: this may be less than n if not
929
enough threads were suspended at the moment */
784
NOTE! The server mutex has to be reserved by the caller! */
932
787
srv_release_threads(
933
788
/*================*/
934
enum srv_thread_type type, /*!< in: thread type */
935
ulint n) /*!< in: number of threads to release */
789
/* out: number of threads
790
released: this may be < n if
791
not enough threads were
792
suspended at the moment */
793
enum srv_thread_type type, /* in: thread type */
794
ulint n) /* in: number of threads to release */
937
796
srv_slot_t* slot;
1012
871
srv_conc_slot_t* conc_slot;
1013
872
srv_slot_t* slot;
1016
876
srv_sys = mem_alloc(sizeof(srv_sys_t));
1018
878
kernel_mutex_temp = mem_alloc(sizeof(mutex_t));
1019
mutex_create(kernel_mutex_key, &kernel_mutex, SYNC_KERNEL);
879
mutex_create(&kernel_mutex, SYNC_KERNEL);
1021
mutex_create(srv_innodb_monitor_mutex_key,
1022
&srv_innodb_monitor_mutex, SYNC_NO_ORDER_CHECK);
881
mutex_create(&srv_innodb_monitor_mutex, SYNC_NO_ORDER_CHECK);
1024
883
srv_sys->threads = mem_alloc(OS_THREAD_MAX_N * sizeof(srv_slot_t));
1058
917
UT_LIST_INIT(srv_sys->tasks);
1060
/* Create dummy indexes for infimum and supremum records */
919
/* create dummy table and index for old-style infimum and supremum */
920
table = dict_mem_table_create("SYS_DUMMY1",
921
DICT_HDR_SPACE, 1, 0);
922
dict_mem_table_add_col(table, NULL, NULL, DATA_CHAR,
923
DATA_ENGLISH | DATA_NOT_NULL, 8);
925
srv_sys->dummy_ind1 = dict_mem_index_create(
926
"SYS_DUMMY1", "SYS_DUMMY1", DICT_HDR_SPACE, 0, 1);
927
dict_index_add_col(srv_sys->dummy_ind1, table,
928
dict_table_get_nth_col(table, 0), 0);
929
srv_sys->dummy_ind1->table = table;
930
/* create dummy table and index for new-style infimum and supremum */
931
table = dict_mem_table_create("SYS_DUMMY2",
932
DICT_HDR_SPACE, 1, DICT_TF_COMPACT);
933
dict_mem_table_add_col(table, NULL, NULL, DATA_CHAR,
934
DATA_ENGLISH | DATA_NOT_NULL, 8);
935
srv_sys->dummy_ind2 = dict_mem_index_create(
936
"SYS_DUMMY2", "SYS_DUMMY2", DICT_HDR_SPACE, 0, 1);
937
dict_index_add_col(srv_sys->dummy_ind2, table,
938
dict_table_get_nth_col(table, 0), 0);
939
srv_sys->dummy_ind2->table = table;
941
/* avoid ut_ad(index->cached) in dict_index_get_n_unique_in_tree */
942
srv_sys->dummy_ind1->cached = srv_sys->dummy_ind2->cached = TRUE;
1064
944
/* Init the server concurrency restriction data structures */
1080
960
trx_i_s_cache_init(trx_i_s_cache);
1083
/*********************************************************************//**
1084
Frees the data structures created in srv_init(). */
963
/*************************************************************************
964
Frees the OS fast mutex created in srv_init(). */
1090
970
os_fast_mutex_free(&srv_conc_mutex);
1091
mem_free(srv_conc_slots);
1092
srv_conc_slots = NULL;
1094
mem_free(srv_sys->threads);
1098
mem_free(kernel_mutex_temp);
1099
kernel_mutex_temp = NULL;
1100
mem_free(srv_mysql_table);
1101
srv_mysql_table = NULL;
1103
trx_i_s_cache_free(trx_i_s_cache);
1106
/*********************************************************************//**
973
/*************************************************************************
1107
974
Initializes the synchronization primitives, memory system, and the thread
1108
975
local storage. */
1285
1147
os_fast_mutex_unlock(&srv_conc_mutex);
1288
/*********************************************************************//**
1150
/*************************************************************************
1289
1151
This lets a thread enter InnoDB regardless of the number of threads inside
1290
1152
InnoDB. This must be called when a thread ends a lock wait. */
1293
1155
srv_conc_force_enter_innodb(
1294
1156
/*========================*/
1295
trx_t* trx) /*!< in: transaction object associated with the
1157
trx_t* trx) /* in: transaction object associated with the
1298
1160
if (UNIV_LIKELY(!srv_thread_concurrency)) {
1311
1171
os_fast_mutex_unlock(&srv_conc_mutex);
1314
/*********************************************************************//**
1174
/*************************************************************************
1315
1175
This must be called when a thread exits InnoDB in a lock wait or at the
1316
1176
end of an SQL statement. */
1319
1179
srv_conc_force_exit_innodb(
1320
1180
/*=======================*/
1321
trx_t* trx) /*!< in: transaction object associated with the
1181
trx_t* trx) /* in: transaction object associated with the
1324
1184
srv_conc_slot_t* slot = NULL;
1186
if (UNIV_LIKELY(!srv_thread_concurrency)) {
1326
1191
if (trx->mysql_thd != NULL
1327
1192
&& thd_is_replication_slave_thread(trx->mysql_thd)) {
1620
1487
row_mysql_unfreeze_data_dictionary(trx);
1622
1489
case RW_X_LATCH:
1623
/* There should never be a lock wait when the
1624
dictionary latch is reserved in X mode. Dictionary
1625
transactions should only acquire locks on dictionary
1626
tables, not other tables. All access to dictionary
1627
tables should be covered by dictionary
1629
ut_print_timestamp(stderr);
1630
fputs(" InnoDB: Error: dict X latch held in "
1631
"srv_suspend_mysql_thread\n", stderr);
1632
/* This should never occur. This incorrect handling
1633
was added in the early development of
1634
ha_innobase::add_index() in InnoDB Plugin 1.0. */
1635
1490
/* Release fast index creation latch */
1636
1491
row_mysql_unlock_data_dictionary(trx);
1715
1561
trx->error_state = DB_LOCK_WAIT_TIMEOUT;
1718
if (trx_is_interrupted(trx)) {
1720
trx->error_state = DB_INTERRUPTED;
1563
#else /* UNIV_HOTBACKUP */
1564
/* This function depends on MySQL code that is not included in
1565
InnoDB Hot Backup builds. Besides, this function should never
1566
be called in InnoDB Hot Backup. */
1568
#endif /* UNIV_HOTBACKUP */
1724
/********************************************************************//**
1571
/************************************************************************
1725
1572
Releases a MySQL OS thread waiting for a lock to be released, if the
1726
1573
thread is already suspended. */
1729
1576
srv_release_mysql_thread_if_suspended(
1730
1577
/*==================================*/
1731
que_thr_t* thr) /*!< in: query thread associated with the
1578
que_thr_t* thr) /* in: query thread associated with the
1732
1579
MySQL OS thread */
1581
#ifndef UNIV_HOTBACKUP
1734
1582
srv_slot_t* slot;
1780
1635
mutex_exit(&srv_innodb_monitor_mutex);
1783
/******************************************************************//**
1784
Outputs to a file the output of the InnoDB Monitor.
1785
@return FALSE if not all information printed
1786
due to failure to obtain necessary mutex */
1638
/**********************************************************************
1639
Outputs to a file the output of the InnoDB Monitor. */
1789
1642
srv_printf_innodb_monitor(
1790
1643
/*======================*/
1791
FILE* file, /*!< in: output stream */
1792
ibool nowait, /*!< in: whether to wait for kernel mutex */
1793
ulint* trx_start, /*!< out: file position of the start of
1644
FILE* file, /* in: output stream */
1645
ulint* trx_start, /* out: file position of the start of
1794
1646
the list of active transactions */
1795
ulint* trx_end) /*!< out: file position of the end of
1647
ulint* trx_end) /* out: file position of the end of
1796
1648
the list of active transactions */
1798
1650
double time_elapsed;
1799
1651
time_t current_time;
1800
1652
ulint n_reserved;
1803
1654
mutex_enter(&srv_innodb_monitor_mutex);
1849
1695
mutex_exit(&dict_foreign_err_mutex);
1851
/* Only if lock_print_info_summary proceeds correctly,
1852
before we call the lock_print_info_all_transactions
1853
to print all the lock information. */
1854
ret = lock_print_info_summary(file, nowait);
1858
long t = ftell(file);
1860
*trx_start = ULINT_UNDEFINED;
1862
*trx_start = (ulint) t;
1865
lock_print_info_all_transactions(file);
1867
long t = ftell(file);
1869
*trx_end = ULINT_UNDEFINED;
1871
*trx_end = (ulint) t;
1697
lock_print_info_summary(file);
1699
long t = ftell(file);
1701
*trx_start = ULINT_UNDEFINED;
1703
*trx_start = (ulint) t;
1706
lock_print_info_all_transactions(file);
1708
long t = ftell(file);
1710
*trx_end = ULINT_UNDEFINED;
1712
*trx_end = (ulint) t;
1876
1715
fputs("--------\n"
1878
1717
"--------\n", file);
1970
1809
"============================\n", file);
1971
1810
mutex_exit(&srv_innodb_monitor_mutex);
1977
/******************************************************************//**
1814
/**********************************************************************
1978
1815
Function to pass InnoDB status variables to MySQL */
1981
1818
srv_export_innodb_status(void)
1982
/*==========================*/
1984
buf_pool_stat_t stat;
1987
ulint flush_list_len;
1989
buf_get_total_stat(&stat);
1990
buf_get_total_list_len(&LRU_len, &free_len, &flush_list_len);
1992
1820
mutex_enter(&srv_innodb_monitor_mutex);
1994
1822
export_vars.innodb_data_pending_reads
2003
1831
export_vars.innodb_data_reads = os_n_file_reads;
2004
1832
export_vars.innodb_data_writes = os_n_file_writes;
2005
1833
export_vars.innodb_data_written = srv_data_written;
2006
export_vars.innodb_buffer_pool_read_requests = stat.n_page_gets;
1834
export_vars.innodb_buffer_pool_read_requests = buf_pool->n_page_gets;
2007
1835
export_vars.innodb_buffer_pool_write_requests
2008
1836
= srv_buf_pool_write_requests;
2009
1837
export_vars.innodb_buffer_pool_wait_free = srv_buf_pool_wait_free;
2010
1838
export_vars.innodb_buffer_pool_pages_flushed = srv_buf_pool_flushed;
2011
1839
export_vars.innodb_buffer_pool_reads = srv_buf_pool_reads;
2012
export_vars.innodb_buffer_pool_read_ahead
2013
= stat.n_ra_pages_read;
2014
export_vars.innodb_buffer_pool_read_ahead_evicted
2015
= stat.n_ra_pages_evicted;
2016
export_vars.innodb_buffer_pool_pages_data = LRU_len;
2017
export_vars.innodb_buffer_pool_pages_dirty = flush_list_len;
2018
export_vars.innodb_buffer_pool_pages_free = free_len;
1840
export_vars.innodb_buffer_pool_read_ahead_rnd = srv_read_ahead_rnd;
1841
export_vars.innodb_buffer_pool_read_ahead_seq = srv_read_ahead_seq;
1842
export_vars.innodb_buffer_pool_pages_data
1843
= UT_LIST_GET_LEN(buf_pool->LRU);
1844
export_vars.innodb_buffer_pool_pages_dirty
1845
= UT_LIST_GET_LEN(buf_pool->flush_list);
1846
export_vars.innodb_buffer_pool_pages_free
1847
= UT_LIST_GET_LEN(buf_pool->free);
2019
1848
#ifdef UNIV_DEBUG
2020
1849
export_vars.innodb_buffer_pool_pages_latched
2021
1850
= buf_get_latched_pages_number();
2022
1851
#endif /* UNIV_DEBUG */
2023
export_vars.innodb_buffer_pool_pages_total = buf_pool_get_n_pages();
1852
export_vars.innodb_buffer_pool_pages_total = buf_pool->curr_size;
2025
export_vars.innodb_buffer_pool_pages_misc
2026
= buf_pool_get_n_pages() - LRU_len - free_len;
2027
#ifdef HAVE_ATOMIC_BUILTINS
2028
export_vars.innodb_have_atomic_builtins = 1;
2030
export_vars.innodb_have_atomic_builtins = 0;
1854
export_vars.innodb_buffer_pool_pages_misc = buf_pool->curr_size
1855
- UT_LIST_GET_LEN(buf_pool->LRU)
1856
- UT_LIST_GET_LEN(buf_pool->free);
2032
1857
export_vars.innodb_page_size = UNIV_PAGE_SIZE;
2033
1858
export_vars.innodb_log_waits = srv_log_waits;
2034
1859
export_vars.innodb_os_log_written = srv_os_log_written;
2039
1864
export_vars.innodb_log_writes = srv_log_writes;
2040
1865
export_vars.innodb_dblwr_pages_written = srv_dblwr_pages_written;
2041
1866
export_vars.innodb_dblwr_writes = srv_dblwr_writes;
2042
export_vars.innodb_pages_created = stat.n_pages_created;
2043
export_vars.innodb_pages_read = stat.n_pages_read;
2044
export_vars.innodb_pages_written = stat.n_pages_written;
1867
export_vars.innodb_pages_created = buf_pool->n_pages_created;
1868
export_vars.innodb_pages_read = buf_pool->n_pages_read;
1869
export_vars.innodb_pages_written = buf_pool->n_pages_written;
2045
1870
export_vars.innodb_row_lock_waits = srv_n_lock_wait_count;
2046
1871
export_vars.innodb_row_lock_current_waits
2047
1872
= srv_n_lock_wait_current_count;
2058
1883
export_vars.innodb_rows_inserted = srv_n_rows_inserted;
2059
1884
export_vars.innodb_rows_updated = srv_n_rows_updated;
2060
1885
export_vars.innodb_rows_deleted = srv_n_rows_deleted;
2061
export_vars.innodb_truncated_status_writes = srv_truncated_status_writes;
2063
1887
mutex_exit(&srv_innodb_monitor_mutex);
2066
/*********************************************************************//**
2067
A thread which prints the info output by various InnoDB monitors.
2068
@return a dummy parameter */
1890
/*************************************************************************
1891
A thread which wakes up threads whose lock wait may have lasted too long.
1892
This also prints the info output by various InnoDB monitors. */
2070
1894
os_thread_ret_t
1895
srv_lock_timeout_and_monitor_thread(
1896
/*================================*/
1897
/* out: a dummy parameter */
2073
1898
void* arg __attribute__((unused)))
2074
/*!< in: a dummy parameter required by
1899
/* in: a dummy parameter required by
2075
1900
os_thread_create */
2077
1903
double time_elapsed;
2078
1904
time_t current_time;
2079
1905
time_t last_table_monitor_time;
2080
1906
time_t last_tablespace_monitor_time;
2081
1907
time_t last_monitor_time;
2082
ulint mutex_skipped;
2083
ibool last_srv_print_monitor;
2085
1912
#ifdef UNIV_DEBUG_THREAD_CREATION
2086
1913
fprintf(stderr, "Lock timeout thread starts, id %lu\n",
2087
1914
os_thread_pf(os_thread_get_curr_id()));
2090
#ifdef UNIV_PFS_THREAD
2091
pfs_register_thread(srv_monitor_thread_key);
2094
1916
UT_NOT_USED(arg);
2095
1917
srv_last_monitor_time = time(NULL);
2096
1918
last_table_monitor_time = time(NULL);
2097
1919
last_tablespace_monitor_time = time(NULL);
2098
1920
last_monitor_time = time(NULL);
2100
last_srv_print_monitor = srv_print_innodb_monitor;
2102
srv_monitor_active = TRUE;
2104
/* Wake up every 5 seconds to see if we need to print
2105
monitor information. */
2107
os_thread_sleep(5000000);
1922
srv_lock_timeout_and_monitor_active = TRUE;
1924
/* When someone is waiting for a lock, we wake up every second
1925
and check if a timeout has passed for a lock wait */
1927
os_thread_sleep(1000000);
2109
1929
current_time = time(NULL);
2114
1934
last_monitor_time = time(NULL);
2116
1936
if (srv_print_innodb_monitor) {
2117
/* Reset mutex_skipped counter everytime
2118
srv_print_innodb_monitor changes. This is to
2119
ensure we will not be blocked by kernel_mutex
2120
for short duration information printing,
2121
such as requested by sync_array_print_long_waits() */
2122
if (!last_srv_print_monitor) {
2124
last_srv_print_monitor = TRUE;
2127
if (!srv_printf_innodb_monitor(stderr,
2128
MUTEX_NOWAIT(mutex_skipped),
2132
/* Reset the counter */
2136
last_srv_print_monitor = FALSE;
1937
srv_printf_innodb_monitor(stderr, NULL, NULL);
2140
1940
if (srv_innodb_status) {
2141
1941
mutex_enter(&srv_monitor_file_mutex);
2142
1942
rewind(srv_monitor_file);
2143
if (!srv_printf_innodb_monitor(srv_monitor_file,
2144
MUTEX_NOWAIT(mutex_skipped),
1943
srv_printf_innodb_monitor(srv_monitor_file, NULL,
2151
1945
os_file_set_eof(srv_monitor_file);
2152
1946
mutex_exit(&srv_monitor_file_mutex);
2203
if (srv_shutdown_state >= SRV_SHUTDOWN_CLEANUP) {
2207
if (srv_print_innodb_monitor
2208
|| srv_print_innodb_lock_monitor
2209
|| srv_print_innodb_tablespace_monitor
2210
|| srv_print_innodb_table_monitor) {
2214
srv_monitor_active = FALSE;
2219
srv_monitor_active = FALSE;
2221
/* We count the number of threads in os_thread_exit(). A created
2222
thread should always use that to exit and not use return() to exit. */
2224
os_thread_exit(NULL);
2226
OS_THREAD_DUMMY_RETURN;
2229
/*********************************************************************//**
2230
A thread which wakes up threads whose lock wait may have lasted too long.
2231
@return a dummy parameter */
2234
srv_lock_timeout_thread(
2235
/*====================*/
2236
void* arg __attribute__((unused)))
2237
/* in: a dummy parameter required by
2245
#ifdef UNIV_PFS_THREAD
2246
pfs_register_thread(srv_lock_timeout_thread_key);
2250
/* When someone is waiting for a lock, we wake up every second
2251
and check if a timeout has passed for a lock wait */
2253
os_thread_sleep(1000000);
2255
srv_lock_timeout_active = TRUE;
2257
1997
mutex_enter(&kernel_mutex);
2259
1999
some_waits = FALSE;
2329
2074
OS_THREAD_DUMMY_RETURN;
2332
/*********************************************************************//**
2077
/*************************************************************************
2333
2078
A thread which prints warnings about semaphore waits which have lasted
2334
too long. These can be used to track bugs which cause hangs.
2335
@return a dummy parameter */
2079
too long. These can be used to track bugs which cause hangs. */
2337
2081
os_thread_ret_t
2338
2082
srv_error_monitor_thread(
2339
2083
/*=====================*/
2084
/* out: a dummy parameter */
2340
2085
void* arg __attribute__((unused)))
2341
/*!< in: a dummy parameter required by
2086
/* in: a dummy parameter required by
2342
2087
os_thread_create */
2344
2089
/* number of successive fatal timeouts observed */
2437
2174
OS_THREAD_DUMMY_RETURN;
2440
/**********************************************************************//**
2441
Check whether any background thread is active.
2442
@return FALSE if all are are suspended or have exited. */
2445
srv_is_any_background_thread_active(void)
2446
/*=====================================*/
2451
mutex_enter(&kernel_mutex);
2453
for (i = SRV_COM; i <= SRV_MASTER; ++i) {
2454
if (srv_n_threads_active[i] != 0) {
2460
mutex_exit(&kernel_mutex);
2465
/*******************************************************************//**
2177
/***********************************************************************
2466
2178
Tells the InnoDB server that there has been activity in the database
2467
2179
and wakes up the master thread if it is suspended (not sleeping). Used
2468
2180
in the MySQL interface. Note that there is a small chance that the master
2469
thread stays suspended (we do not protect our operation with the
2470
srv_sys_t->mutex, for performance reasons). */
2181
thread stays suspended (we do not protect our operation with the kernel
2182
mutex, for performace reasons). */
2473
2185
srv_active_wake_master_thread(void)
2488
/*******************************************************************//**
2489
Tells the purge thread that there has been activity in the database
2490
and wakes up the purge thread if it is suspended (not sleeping). Note
2491
that there is a small chance that the purge thread stays suspended
2492
(we do not protect our operation with the kernel mutex, for
2493
performace reasons). */
2496
srv_wake_purge_thread_if_not_active(void)
2497
/*=====================================*/
2499
ut_ad(!mutex_own(&kernel_mutex));
2501
if (srv_n_purge_threads > 0
2502
&& srv_n_threads_active[SRV_WORKER] == 0) {
2504
mutex_enter(&kernel_mutex);
2506
srv_release_threads(SRV_WORKER, 1);
2508
mutex_exit(&kernel_mutex);
2512
/*******************************************************************//**
2200
/***********************************************************************
2513
2201
Wakes up the master thread if it is suspended or being suspended. */
2525
2213
mutex_exit(&kernel_mutex);
2528
/*******************************************************************//**
2529
Wakes up the purge thread if it's not already awake. */
2532
srv_wake_purge_thread(void)
2533
/*=======================*/
2535
ut_ad(!mutex_own(&kernel_mutex));
2537
if (srv_n_purge_threads > 0) {
2539
mutex_enter(&kernel_mutex);
2541
srv_release_threads(SRV_WORKER, 1);
2543
mutex_exit(&kernel_mutex);
2547
/**********************************************************************
2548
The master thread is tasked to ensure that flush of log file happens
2549
once every second in the background. This is to ensure that not more
2550
than one second of trxs are lost in case of crash when
2551
innodb_flush_logs_at_trx_commit != 1 */
2554
srv_sync_log_buffer_in_background(void)
2555
/*===================================*/
2557
time_t current_time = time(NULL);
2559
srv_main_thread_op_info = "flushing log";
2560
if (difftime(current_time, srv_last_log_flush_time) >= 1) {
2561
log_buffer_sync_in_background(TRUE);
2562
srv_last_log_flush_time = current_time;
2563
srv_log_writes_and_flush++;
2567
/********************************************************************//**
2568
Do a full purge, reconfigure the purge sub-system if a dynamic
2569
change is detected. */
2572
srv_master_do_purge(void)
2573
/*=====================*/
2575
ulint n_pages_purged;
2577
ut_ad(!mutex_own(&kernel_mutex));
2579
ut_a(srv_n_purge_threads == 0);
2582
/* Check for shutdown and change in purge config. */
2583
if (srv_fast_shutdown && srv_shutdown_state > 0) {
2584
/* Nothing to purge. */
2587
n_pages_purged = trx_purge(srv_purge_batch_size);
2590
srv_sync_log_buffer_in_background();
2592
} while (n_pages_purged > 0);
2595
/*********************************************************************//**
2596
The master thread controlling the server.
2597
@return a dummy parameter */
2216
/*************************************************************************
2217
The master thread controlling the server. */
2599
2219
os_thread_ret_t
2600
2220
srv_master_thread(
2601
2221
/*==============*/
2222
/* out: a dummy parameter */
2602
2223
void* arg __attribute__((unused)))
2603
/*!< in: a dummy parameter required by
2224
/* in: a dummy parameter required by
2604
2225
os_thread_create */
2606
buf_pool_stat_t buf_stat;
2607
2227
os_event_t event;
2228
time_t last_flush_time;
2229
time_t current_time;
2608
2230
ulint old_activity_count;
2609
2231
ulint n_pages_purged = 0;
2610
2232
ulint n_bytes_merged;
2663
2279
/* ---- We run the following loop approximately once per second
2664
2280
when there is database activity */
2666
srv_last_log_flush_time = time(NULL);
2668
/* Sleep for 1 second on entrying the for loop below the first time. */
2669
next_itr_time = ut_time_ms() + 1000;
2671
2284
for (i = 0; i < 10; i++) {
2672
ulint cur_time = ut_time_ms();
2674
buf_get_total_stat(&buf_stat);
2676
n_ios_old = log_sys->n_log_ios + buf_stat.n_pages_read
2677
+ buf_stat.n_pages_written;
2285
n_ios_old = log_sys->n_log_ios + buf_pool->n_pages_read
2286
+ buf_pool->n_pages_written;
2679
2287
srv_main_thread_op_info = "sleeping";
2680
srv_main_1_second_loops++;
2682
if (next_itr_time > cur_time) {
2684
/* Get sleep interval in micro seconds. We use
2685
ut_min() to avoid long sleep in case of
2687
os_thread_sleep(ut_min(1000000,
2688
(next_itr_time - cur_time)
2291
os_thread_sleep(1000000);
2693
/* Each iteration should happen at 1 second interval. */
2694
next_itr_time = ut_time_ms() + 1000;
2696
2296
/* ALTER TABLE in MySQL requires on Unix that the table handler
2697
2297
can drop tables lazily after there no longer are SELECT
2708
2308
goto background_loop;
2711
/* Flush logs if needed */
2712
srv_sync_log_buffer_in_background();
2311
/* We flush the log once in a second even if no commit
2312
is issued or the we have specified in my.cnf no flush
2313
at transaction commit */
2315
srv_main_thread_op_info = "flushing log";
2316
log_buffer_flush_to_disk();
2714
2318
srv_main_thread_op_info = "making checkpoint";
2715
2319
log_free_check();
2717
/* If i/os during one second sleep were less than 5% of
2718
capacity, we assume that there is free disk i/o capacity
2719
available, and it makes sense to do an insert buffer merge. */
2321
/* If there were less than 5 i/os during the
2322
one second sleep, we assume that there is free
2323
disk i/o capacity available, and it makes sense to
2324
do an insert buffer merge. */
2721
buf_get_total_stat(&buf_stat);
2722
2326
n_pend_ios = buf_get_n_pending_ios()
2723
2327
+ log_sys->n_pending_writes;
2724
n_ios = log_sys->n_log_ios + buf_stat.n_pages_read
2725
+ buf_stat.n_pages_written;
2726
if (n_pend_ios < SRV_PEND_IO_THRESHOLD
2727
&& (n_ios - n_ios_old < SRV_RECENT_IO_ACTIVITY)) {
2328
n_ios = log_sys->n_log_ios + buf_pool->n_pages_read
2329
+ buf_pool->n_pages_written;
2330
if (n_pend_ios < 3 && (n_ios - n_ios_old < 5)) {
2728
2331
srv_main_thread_op_info = "doing insert buffer merge";
2729
ibuf_contract_for_n_pages(FALSE, PCT_IO(5));
2731
/* Flush logs if needed */
2732
srv_sync_log_buffer_in_background();
2332
ibuf_contract_for_n_pages(
2333
TRUE, srv_insert_buffer_batch_size / 4);
2335
srv_main_thread_op_info = "flushing log";
2337
log_buffer_flush_to_disk();
2735
2340
if (UNIV_UNLIKELY(buf_get_modified_ratio_pct()
2738
2343
/* Try to keep the number of modified pages in the
2739
2344
buffer pool under the limit wished by the user */
2741
srv_main_thread_op_info =
2742
"flushing buffer pool pages";
2743
n_pages_flushed = buf_flush_list(
2744
PCT_IO(100), IB_ULONGLONG_MAX);
2746
} else if (srv_adaptive_flushing) {
2748
/* Try to keep the rate of flushing of dirty
2749
pages such that redo log generation does not
2750
produce bursts of IO at checkpoint time. */
2751
ulint n_flush = buf_flush_get_desired_flush_rate();
2754
srv_main_thread_op_info =
2755
"flushing buffer pool pages";
2756
n_flush = ut_min(PCT_IO(100), n_flush);
2346
n_pages_flushed = buf_flush_batch(BUF_FLUSH_LIST, 100,
2349
/* If we had to do the flush, it may have taken
2350
even more than 1 second, and also, there may be more
2351
to flush. Do not sleep 1 second during the next
2352
iteration of this loop. */
2764
2357
if (srv_activity_count == old_activity_count) {
2779
2372
mem_validate_all_blocks();
2781
/* If i/os during the 10 second period were less than 200% of
2782
capacity, we assume that there is free disk i/o capacity
2783
available, and it makes sense to flush srv_io_capacity pages.
2785
Note that this is done regardless of the fraction of dirty
2786
pages relative to the max requested by the user. The one second
2787
loop above requests writes for that case. The writes done here
2788
are not required, and may be disabled. */
2790
buf_get_total_stat(&buf_stat);
2374
/* If there were less than 200 i/os during the 10 second period,
2375
we assume that there is free disk i/o capacity available, and it
2376
makes sense to flush 100 pages. */
2791
2378
n_pend_ios = buf_get_n_pending_ios() + log_sys->n_pending_writes;
2792
n_ios = log_sys->n_log_ios + buf_stat.n_pages_read
2793
+ buf_stat.n_pages_written;
2795
srv_main_10_second_loops++;
2796
if (n_pend_ios < SRV_PEND_IO_THRESHOLD
2797
&& (n_ios - n_ios_very_old < SRV_PAST_IO_ACTIVITY)) {
2379
n_ios = log_sys->n_log_ios + buf_pool->n_pages_read
2380
+ buf_pool->n_pages_written;
2381
if (n_pend_ios < 3 && (n_ios - n_ios_very_old < 200)) {
2799
2383
srv_main_thread_op_info = "flushing buffer pool pages";
2800
buf_flush_list(PCT_IO(100), IB_ULONGLONG_MAX);
2384
buf_flush_batch(BUF_FLUSH_LIST, 100, IB_ULONGLONG_MAX);
2802
/* Flush logs if needed */
2803
srv_sync_log_buffer_in_background();
2386
srv_main_thread_op_info = "flushing log";
2387
log_buffer_flush_to_disk();
2806
2390
/* We run a batch of insert buffer merge every 10 seconds,
2807
2391
even if the server were active */
2809
2393
srv_main_thread_op_info = "doing insert buffer merge";
2810
ibuf_contract_for_n_pages(FALSE, PCT_IO(5));
2812
/* Flush logs if needed */
2813
srv_sync_log_buffer_in_background();
2815
if (srv_n_purge_threads == 0) {
2816
srv_main_thread_op_info = "master purging";
2818
srv_master_do_purge();
2394
ibuf_contract_for_n_pages(TRUE, srv_insert_buffer_batch_size / 4);
2396
srv_main_thread_op_info = "flushing log";
2397
log_buffer_flush_to_disk();
2399
/* We run a full purge every 10 seconds, even if the server
2402
last_flush_time = time(NULL);
2820
2406
if (srv_fast_shutdown && srv_shutdown_state > 0) {
2822
2408
goto background_loop;
2411
srv_main_thread_op_info = "purging";
2412
n_pages_purged = trx_purge();
2414
current_time = time(NULL);
2416
if (difftime(current_time, last_flush_time) > 1) {
2417
srv_main_thread_op_info = "flushing log";
2419
log_buffer_flush_to_disk();
2420
last_flush_time = current_time;
2422
} while (n_pages_purged);
2826
2424
srv_main_thread_op_info = "flushing buffer pool pages";
2833
2431
(> 70 %), we assume we can afford reserving the disk(s) for
2834
2432
the time it requires to flush 100 pages */
2836
n_pages_flushed = buf_flush_list(
2837
PCT_IO(100), IB_ULONGLONG_MAX);
2434
n_pages_flushed = buf_flush_batch(BUF_FLUSH_LIST, 100,
2839
2437
/* Otherwise, we only flush a small number of pages so that
2840
2438
we do not unnecessarily use much disk i/o capacity from
2843
n_pages_flushed = buf_flush_list(
2844
PCT_IO(10), IB_ULONGLONG_MAX);
2441
n_pages_flushed = buf_flush_batch(BUF_FLUSH_LIST, 10,
2847
2445
srv_main_thread_op_info = "making checkpoint";
2888
2486
os_thread_sleep(100000);
2891
if (srv_n_purge_threads == 0) {
2892
srv_main_thread_op_info = "master purging";
2894
srv_master_do_purge();
2489
srv_main_thread_op_info = "purging";
2491
/* Run a full purge */
2493
last_flush_time = time(NULL);
2496
if (srv_fast_shutdown && srv_shutdown_state > 0) {
2501
srv_main_thread_op_info = "purging";
2502
n_pages_purged = trx_purge();
2504
current_time = time(NULL);
2506
if (difftime(current_time, last_flush_time) > 1) {
2507
srv_main_thread_op_info = "flushing log";
2509
log_buffer_flush_to_disk();
2510
last_flush_time = current_time;
2512
} while (n_pages_purged);
2897
2514
srv_main_thread_op_info = "reserving kernel mutex";
2908
2525
if (srv_fast_shutdown && srv_shutdown_state > 0) {
2909
2526
n_bytes_merged = 0;
2911
/* This should do an amount of IO similar to the number of
2912
dirty pages that will be flushed in the call to
2913
buf_flush_list below. Otherwise, the system favors
2914
clean pages over cleanup throughput. */
2915
n_bytes_merged = ibuf_contract_for_n_pages(FALSE,
2528
n_bytes_merged = ibuf_contract_for_n_pages(
2529
TRUE, srv_insert_buffer_batch_size);
2919
2532
srv_main_thread_op_info = "reserving kernel mutex";
3047
#if (!defined(__SUNPRO_C) && !defined(__SUNPRO_CC))
3048
OS_THREAD_DUMMY_RETURN; /* Not reached, avoid compiler warning */
3052
/*********************************************************************//**
3053
Asynchronous purge thread.
3054
@return a dummy parameter */
3059
void* arg __attribute__((unused))) /*!< in: a dummy parameter
3060
required by os_thread_create */
3063
ulint slot_no = ULINT_UNDEFINED;
3064
ulint n_total_purged = ULINT_UNDEFINED;
3066
ut_a(srv_n_purge_threads == 1);
3068
#ifdef UNIV_DEBUG_THREAD_CREATION
3069
fprintf(stderr, "InnoDB: Purge thread running, id %lu\n",
3070
os_thread_pf(os_thread_get_curr_id()));
3071
#endif /* UNIV_DEBUG_THREAD_CREATION */
3073
mutex_enter(&kernel_mutex);
3075
slot_no = srv_table_reserve_slot(SRV_WORKER);
3077
slot = srv_table_get_nth_slot(slot_no);
3079
++srv_n_threads_active[SRV_WORKER];
3081
mutex_exit(&kernel_mutex);
3083
while (srv_shutdown_state != SRV_SHUTDOWN_EXIT_THREADS) {
3085
ulint n_pages_purged;
3087
/* If there are very few records to purge or the last
3088
purge didn't purge any records then wait for activity.
3089
We peek at the history len without holding any mutex
3090
because in the worst case we will end up waiting for
3091
the next purge event. */
3092
if (trx_sys->rseg_history_len < srv_purge_batch_size
3093
|| n_total_purged == 0) {
3097
mutex_enter(&kernel_mutex);
3099
event = srv_suspend_thread();
3101
mutex_exit(&kernel_mutex);
3103
os_event_wait(event);
3106
/* Check for shutdown and whether we should do purge at all. */
3107
if (srv_force_recovery >= SRV_FORCE_NO_BACKGROUND
3108
|| srv_shutdown_state != 0
3109
|| srv_fast_shutdown) {
3116
/* Purge until there are no more records to purge and there is
3117
no change in configuration or server state. */
3119
n_pages_purged = trx_purge(srv_purge_batch_size);
3121
n_total_purged += n_pages_purged;
3123
} while (n_pages_purged > 0 && !srv_fast_shutdown);
3125
srv_sync_log_buffer_in_background();
3128
mutex_enter(&kernel_mutex);
3130
ut_ad(srv_table_get_nth_slot(slot_no) == slot);
3132
/* Decrement the active count. */
3133
srv_suspend_thread();
3135
slot->in_use = FALSE;
3137
/* Free the thread local memory. */
3138
thr_local_free(os_thread_get_curr_id());
3140
mutex_exit(&kernel_mutex);
3142
#ifdef UNIV_DEBUG_THREAD_CREATION
3143
fprintf(stderr, "InnoDB: Purge thread exiting, id %lu\n",
3144
os_thread_pf(os_thread_get_curr_id()));
3145
#endif /* UNIV_DEBUG_THREAD_CREATION */
3147
/* We count the number of threads in os_thread_exit(). A created
3148
thread should always use that to exit and not use return() to exit. */
3149
os_thread_exit(NULL);
3151
OS_THREAD_DUMMY_RETURN; /* Not reached, avoid compiler warning */
3154
/**********************************************************************//**
3155
Enqueues a task to server task queue and releases a worker thread, if there
3156
is a suspended one. */
3159
srv_que_task_enqueue_low(
3160
/*=====================*/
3161
que_thr_t* thr) /*!< in: query thread */
3165
mutex_enter(&kernel_mutex);
3167
UT_LIST_ADD_LAST(queue, srv_sys->tasks, thr);
3169
srv_release_threads(SRV_WORKER, 1);
3171
mutex_exit(&kernel_mutex);
2659
OS_THREAD_DUMMY_RETURN; /* Not reached, avoid compiler warning */
2661
#endif /* !UNIV_HOTBACKUP */