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/*****************************************************************************
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Copyright (c) 1995, 2010, Innobase Oy. All Rights Reserved.
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Copyright (c) 2008, 2009 Google Inc.
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Copyright (c) 2009, Percona Inc.
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Copyright (c) 1995, 2009, Innobase Oy. All Rights Reserved.
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Copyright (c) 2008, Google Inc.
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Portions of this file contain modifications contributed and copyrighted by
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Google, Inc. Those modifications are gratefully acknowledged and are described
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incorporated with their permission, and subject to the conditions contained in
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the file COPYING.Google.
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Portions of this file contain modifications contributed and copyrighted
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by Percona Inc.. Those modifications are
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gratefully acknowledged and are described briefly in the InnoDB
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documentation. The contributions by Percona Inc. are incorporated with
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their permission, and subject to the conditions contained in the file
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; version 2 of the License.
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc., 51 Franklin
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St, Fifth Floor, Boston, MA 02110-1301 USA
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this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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Place, Suite 330, Boston, MA 02111-1307 USA
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*****************************************************************************/
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/**************************************************//**
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/******************************************************
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The database server main program
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NOTE: SQL Server 7 uses something which the documentation
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in microseconds, in order to reduce the lagging of the purge thread. */
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UNIV_INTERN ulint srv_dml_needed_delay = 0;
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UNIV_INTERN ibool srv_lock_timeout_active = FALSE;
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UNIV_INTERN ibool srv_monitor_active = FALSE;
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UNIV_INTERN ibool srv_lock_timeout_and_monitor_active = FALSE;
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UNIV_INTERN ibool srv_error_monitor_active = FALSE;
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UNIV_INTERN const char* srv_main_thread_op_info = "";
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/** Prefix used by MySQL to indicate pre-5.1 table name encoding */
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/* Prefix used by MySQL to indicate pre-5.1 table name encoding */
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UNIV_INTERN const char srv_mysql50_table_name_prefix[9] = "#mysql50#";
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/* Server parameters which are read from the initfile */
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UNIV_INTERN char* srv_arch_dir = NULL;
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#endif /* UNIV_LOG_ARCHIVE */
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/** store to its own file each table created by an user; data
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/* store to its own file each table created by an user; data
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dictionary tables are in the system tablespace 0 */
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UNIV_INTERN my_bool srv_file_per_table;
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/** The file format to use on new *.ibd files. */
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/* The file format to use on new *.ibd files. */
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UNIV_INTERN ulint srv_file_format = 0;
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/** Whether to check file format during startup. A value of
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/* Whether to check file format during startup a value of
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DICT_TF_FORMAT_MAX + 1 means no checking ie. FALSE. The default is to
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set it to the highest format we support. */
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UNIV_INTERN ulint srv_max_file_format_at_startup = DICT_TF_FORMAT_MAX;
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UNIV_INTERN ulint srv_check_file_format_at_startup = DICT_TF_FORMAT_MAX;
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#if DICT_TF_FORMAT_51
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# error "DICT_TF_FORMAT_51 must be 0!"
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/** Place locks to records only i.e. do not use next-key locking except
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/* Place locks to records only i.e. do not use next-key locking except
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on duplicate key checking and foreign key checking */
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UNIV_INTERN ibool srv_locks_unsafe_for_binlog = FALSE;
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/* If this flag is TRUE, then we will use the native aio of the
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OS (provided we compiled Innobase with it in), otherwise we will
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use simulated aio we build below with threads.
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Currently we support native aio on windows and linux */
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UNIV_INTERN my_bool srv_use_native_aio = TRUE;
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/* Windows native condition variables. We use runtime loading / function
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pointers, because they are not available on Windows Server 2003 and
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We use condition for events on Windows if possible, even if os_event
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resembles Windows kernel event object well API-wise. The reason is
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performance, kernel objects are heavyweights and WaitForSingleObject() is a
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performance killer causing calling thread to context switch. Besides, Innodb
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is preallocating large number (often millions) of os_events. With kernel event
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objects it takes a big chunk out of non-paged pool, which is better suited
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for tasks like IO than for storing idle event objects. */
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UNIV_INTERN ibool srv_use_native_conditions = FALSE;
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UNIV_INTERN ulint srv_n_data_files = 0;
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UNIV_INTERN char** srv_data_file_names = NULL;
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/* size in database pages */
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UNIV_INTERN ulint srv_log_buffer_size = ULINT_MAX;
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UNIV_INTERN ulong srv_flush_log_at_trx_commit = 1;
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/* Try to flush dirty pages so as to avoid IO bursts at
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UNIV_INTERN bool srv_adaptive_flushing = TRUE;
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/** Maximum number of times allowed to conditionally acquire
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mutex before switching to blocking wait on the mutex */
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#define MAX_MUTEX_NOWAIT 20
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/** Check whether the number of failed nonblocking mutex
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acquisition attempts exceeds maximum allowed value. If so,
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srv_printf_innodb_monitor() will request mutex acquisition
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with mutex_enter(), which will wait until it gets the mutex. */
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#define MUTEX_NOWAIT(mutex_skipped) ((mutex_skipped) < MAX_MUTEX_NOWAIT)
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/** The sort order table of the MySQL latin1_swedish_ci character set
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/* The sort order table of the MySQL latin1_swedish_ci character set
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#if defined(BUILD_DRIZZLE)
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UNIV_INTERN const byte srv_latin1_ordering[256] /* The sort order table of the latin1
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character set. The following table is
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the MySQL order as of Feb 10th, 2002 */
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, 0x44, 0x4E, 0x4F, 0x4F, 0x4F, 0x4F, 0x5D, 0xF7
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, 0xD8, 0x55, 0x55, 0x55, 0x59, 0x59, 0xDE, 0xFF
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UNIV_INTERN const byte* srv_latin1_ordering;
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#endif /* BUILD_DRIZZLE */
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/* use os/external memory allocator */
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UNIV_INTERN my_bool srv_use_sys_malloc = TRUE;
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/* requested size in kilobytes */
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UNIV_INTERN ulint srv_buf_pool_size = ULINT_MAX;
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/* requested number of buffer pool instances */
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UNIV_INTERN ulint srv_buf_pool_instances = 1;
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/* previously requested size */
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UNIV_INTERN ulint srv_buf_pool_old_size;
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/* current size in kilobytes */
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UNIV_INTERN ulint srv_mem_pool_size = ULINT_MAX;
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UNIV_INTERN ulint srv_lock_table_size = ULINT_MAX;
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/* This parameter is deprecated. Use srv_n_io_[read|write]_threads
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UNIV_INTERN ulint srv_n_file_io_threads = ULINT_MAX;
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UNIV_INTERN ulint srv_n_read_io_threads = ULINT_MAX;
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UNIV_INTERN ulint srv_n_write_io_threads = ULINT_MAX;
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/* User settable value of the number of pages that must be present
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in the buffer cache and accessed sequentially for InnoDB to trigger a
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readahead request. */
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UNIV_INTERN ulong srv_read_ahead_threshold = 56;
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#ifdef UNIV_LOG_ARCHIVE
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UNIV_INTERN ibool srv_log_archive_on = FALSE;
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UNIV_INTERN ulint srv_max_n_open_files = 300;
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/* Number of IO operations per second the server can do */
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UNIV_INTERN ulong srv_io_capacity = 200;
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/* The InnoDB main thread tries to keep the ratio of modified pages
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in the buffer pool to all database pages in the buffer pool smaller than
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the following number. But it is not guaranteed that the value stays below
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that during a time of heavy update/insert activity. */
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UNIV_INTERN ulong srv_max_buf_pool_modified_pct = 75;
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/* the number of purge threads to use from the worker pool (currently 0 or 1).*/
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UNIV_INTERN ulong srv_n_purge_threads = 0;
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/* the number of records to purge in one batch */
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UNIV_INTERN ulong srv_purge_batch_size = 20;
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UNIV_INTERN ulong srv_max_buf_pool_modified_pct = 90;
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/* variable counts amount of data read in total (in bytes) */
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UNIV_INTERN ulint srv_data_read = 0;
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pool to the disk */
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UNIV_INTERN ulint srv_buf_pool_flushed = 0;
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/** Number of buffer pool reads that led to the
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/* variable to count the number of buffer pool reads that led to the
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reading of a disk page */
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UNIV_INTERN ulint srv_buf_pool_reads = 0;
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/* variable to count the number of sequential read-aheads */
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UNIV_INTERN ulint srv_read_ahead_seq = 0;
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/* variable to count the number of random read-aheads */
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UNIV_INTERN ulint srv_read_ahead_rnd = 0;
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/* structure to pass status variables to MySQL */
359
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UNIV_INTERN export_struc export_vars;
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typedef struct srv_conc_slot_struct srv_conc_slot_t;
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struct srv_conc_slot_struct{
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os_event_t event; /*!< event to wait */
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ibool reserved; /*!< TRUE if slot
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os_event_t event; /* event to wait */
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ibool reserved; /* TRUE if slot
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ibool wait_ended; /*!< TRUE when another
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ibool wait_ended; /* TRUE when another
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thread has already set
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the event and the
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thread in this slot is
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free to proceed; but
403
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reserved may still be
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TRUE at that point */
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UT_LIST_NODE_T(srv_conc_slot_t) srv_conc_queue; /*!< queue node */
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UT_LIST_NODE_T(srv_conc_slot_t) srv_conc_queue; /* queue node */
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/* queue of threads waiting to get in */
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UNIV_INTERN ibool srv_use_doublewrite_buf = TRUE;
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UNIV_INTERN ibool srv_use_checksums = TRUE;
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UNIV_INTERN ibool srv_set_thread_priorities = TRUE;
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UNIV_INTERN int srv_query_thread_priority = 0;
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UNIV_INTERN ulong srv_replication_delay = 0;
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/*-------------------------------------------*/
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UNIV_INTERN ulong srv_n_spin_wait_rounds = 30;
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UNIV_INTERN ulong srv_n_spin_wait_rounds = 20;
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UNIV_INTERN ulong srv_n_free_tickets_to_enter = 500;
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UNIV_INTERN ulong srv_thread_sleep_delay = 10000;
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UNIV_INTERN ulong srv_spin_wait_delay = 6;
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UNIV_INTERN ulint srv_spin_wait_delay = 5;
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UNIV_INTERN ibool srv_priority_boost = TRUE;
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#ifdef UNIV_DEBUG
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UNIV_INTERN ulint srv_n_rows_updated = 0;
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UNIV_INTERN ulint srv_n_rows_deleted = 0;
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UNIV_INTERN ulint srv_n_rows_read = 0;
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#ifndef UNIV_HOTBACKUP
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static ulint srv_n_rows_inserted_old = 0;
457
398
static ulint srv_n_rows_updated_old = 0;
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static ulint srv_n_rows_deleted_old = 0;
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static ulint srv_n_rows_read_old = 0;
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#endif /* !UNIV_HOTBACKUP */
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UNIV_INTERN ulint srv_n_lock_wait_count = 0;
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UNIV_INTERN ulint srv_n_lock_wait_current_count = 0;
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UNIV_INTERN ib_int64_t srv_n_lock_wait_time = 0;
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UNIV_INTERN ulint srv_n_lock_max_wait_time = 0;
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UNIV_INTERN ulint srv_truncated_status_writes = 0;
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Set the following to 0 if you want InnoDB to write messages on
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/* Mutex for locking srv_monitor_file */
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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;
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/* Key to register srv_monitor_file_mutex with performance schema */
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UNIV_INTERN mysql_pfs_key_t srv_monitor_file_mutex_key;
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/* Key to register srv_dict_tmpfile_mutex with performance schema */
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UNIV_INTERN mysql_pfs_key_t srv_dict_tmpfile_mutex_key;
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/* Key to register the mutex with performance schema */
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UNIV_INTERN mysql_pfs_key_t srv_misc_tmpfile_mutex_key;
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#endif /* UNIV_PFS_MUTEX */
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/* Temporary file for innodb monitor output */
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UNIV_INTERN FILE* srv_monitor_file;
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/* Mutex for locking srv_dict_tmpfile.
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UNIV_INTERN ulint srv_main_thread_process_no = 0;
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UNIV_INTERN ulint srv_main_thread_id = 0;
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/* The following count work done by srv_master_thread. */
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/* Iterations by the 'once per second' loop. */
525
static ulint srv_main_1_second_loops = 0;
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/* Calls to sleep by the 'once per second' loop. */
527
static ulint srv_main_sleeps = 0;
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/* Iterations by the 'once per 10 seconds' loop. */
529
static ulint srv_main_10_second_loops = 0;
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/* Iterations of the loop bounded by the 'background_loop' label. */
531
static ulint srv_main_background_loops = 0;
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/* Iterations of the loop bounded by the 'flush_loop' label. */
533
static ulint srv_main_flush_loops = 0;
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/* Log writes involving flush. */
535
static ulint srv_log_writes_and_flush = 0;
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/* 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
450
IMPLEMENTATION OF THE SERVER MAIN PROGRAM
552
451
=========================================
718
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/* Thread slot in the thread table */
719
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struct srv_slot_struct{
720
os_thread_id_t id; /*!< thread id */
721
os_thread_t handle; /*!< thread handle */
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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
619
os_thread_id_t id; /* thread id */
620
os_thread_t handle; /* thread handle */
621
unsigned type:3; /* thread type: user, utility etc. */
622
unsigned in_use:1; /* TRUE if this slot is in use */
623
unsigned suspended:1; /* TRUE if the thread is waiting
725
624
for the event of this slot */
726
ib_time_t suspend_time; /*!< time when the thread was
625
ib_time_t suspend_time; /* time when the thread was
728
os_event_t event; /*!< event used in suspending the
627
os_event_t event; /* event used in suspending the
729
628
thread when it has nothing to do */
730
que_thr_t* thr; /*!< suspended query thread (only
629
que_thr_t* thr; /* suspended query thread (only
731
630
used for MySQL threads) */
761
660
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
663
/* The following values give info about the activity going on in
782
664
the database. They are protected by the server mutex. The arrays
783
665
are indexed by the type of the thread. */
785
667
UNIV_INTERN ulint srv_n_threads_active[SRV_MASTER + 1];
786
668
UNIV_INTERN ulint srv_n_threads[SRV_MASTER + 1];
788
/*********************************************************************//**
670
/*************************************************************************
789
671
Sets the info describing an i/o thread current state. */
792
674
srv_set_io_thread_op_info(
793
675
/*======================*/
794
ulint i, /*!< in: the 'segment' of the i/o thread */
795
const char* str) /*!< in: constant char string describing the
676
ulint i, /* in: the 'segment' of the i/o thread */
677
const char* str) /* in: constant char string describing the
798
680
ut_a(i < SRV_MAX_N_IO_THREADS);
800
682
srv_io_thread_op_info[i] = str;
803
/*********************************************************************//**
685
/*************************************************************************
804
686
Accessor function to get pointer to n'th slot in the server thread
806
@return pointer to the slot */
809
690
srv_table_get_nth_slot(
810
691
/*===================*/
811
ulint index) /*!< in: index of the slot */
692
/* out: pointer to the slot */
693
ulint index) /* in: index of the slot */
813
695
ut_a(index < OS_THREAD_MAX_N);
815
697
return(srv_sys->threads + index);
818
/*********************************************************************//**
819
Gets the number of threads in the system.
820
@return sum of srv_n_threads[] */
700
#ifndef UNIV_HOTBACKUP
701
/*************************************************************************
702
Gets the number of threads in the system. */
823
705
srv_get_n_threads(void)
838
720
return(n_threads);
841
/*********************************************************************//**
723
/*************************************************************************
842
724
Reserves a slot in the thread table for the current thread. Also creates the
843
725
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 */
726
has to be reserved by the caller! */
848
729
srv_table_reserve_slot(
849
730
/*===================*/
850
enum srv_thread_type type) /*!< in: type of the thread */
731
/* out: reserved slot index */
732
enum srv_thread_type type) /* in: type of the thread */
852
734
srv_slot_t* slot;
806
#endif /* !UNIV_HOTBACKUP */
925
/*********************************************************************//**
808
/*************************************************************************
926
809
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 */
810
NOTE! The server mutex has to be reserved by the caller! */
932
813
srv_release_threads(
933
814
/*================*/
934
enum srv_thread_type type, /*!< in: thread type */
935
ulint n) /*!< in: number of threads to release */
815
/* out: number of threads
816
released: this may be < n if
817
not enough threads were
818
suspended at the moment */
819
enum srv_thread_type type, /* in: thread type */
820
ulint n) /* in: number of threads to release */
937
822
srv_slot_t* slot;
1012
897
srv_conc_slot_t* conc_slot;
1013
898
srv_slot_t* slot;
1016
902
srv_sys = mem_alloc(sizeof(srv_sys_t));
1018
904
kernel_mutex_temp = mem_alloc(sizeof(mutex_t));
1019
mutex_create(kernel_mutex_key, &kernel_mutex, SYNC_KERNEL);
905
mutex_create(&kernel_mutex, SYNC_KERNEL);
1021
mutex_create(srv_innodb_monitor_mutex_key,
1022
&srv_innodb_monitor_mutex, SYNC_NO_ORDER_CHECK);
907
mutex_create(&srv_innodb_monitor_mutex, SYNC_NO_ORDER_CHECK);
1024
909
srv_sys->threads = mem_alloc(OS_THREAD_MAX_N * sizeof(srv_slot_t));
1058
943
UT_LIST_INIT(srv_sys->tasks);
1060
/* Create dummy indexes for infimum and supremum records */
945
/* create dummy table and index for old-style infimum and supremum */
946
table = dict_mem_table_create("SYS_DUMMY1",
947
DICT_HDR_SPACE, 1, 0);
948
dict_mem_table_add_col(table, NULL, NULL, DATA_CHAR,
949
DATA_ENGLISH | DATA_NOT_NULL, 8);
951
srv_sys->dummy_ind1 = dict_mem_index_create(
952
"SYS_DUMMY1", "SYS_DUMMY1", DICT_HDR_SPACE, 0, 1);
953
dict_index_add_col(srv_sys->dummy_ind1, table,
954
dict_table_get_nth_col(table, 0), 0);
955
srv_sys->dummy_ind1->table = table;
956
/* create dummy table and index for new-style infimum and supremum */
957
table = dict_mem_table_create("SYS_DUMMY2",
958
DICT_HDR_SPACE, 1, DICT_TF_COMPACT);
959
dict_mem_table_add_col(table, NULL, NULL, DATA_CHAR,
960
DATA_ENGLISH | DATA_NOT_NULL, 8);
961
srv_sys->dummy_ind2 = dict_mem_index_create(
962
"SYS_DUMMY2", "SYS_DUMMY2", DICT_HDR_SPACE, 0, 1);
963
dict_index_add_col(srv_sys->dummy_ind2, table,
964
dict_table_get_nth_col(table, 0), 0);
965
srv_sys->dummy_ind2->table = table;
967
/* avoid ut_ad(index->cached) in dict_index_get_n_unique_in_tree */
968
srv_sys->dummy_ind1->cached = srv_sys->dummy_ind2->cached = TRUE;
1064
970
/* Init the server concurrency restriction data structures */
1080
986
trx_i_s_cache_init(trx_i_s_cache);
1083
/*********************************************************************//**
1084
Frees the data structures created in srv_init(). */
989
/*************************************************************************
990
Frees the OS fast mutex created in srv_init(). */
1090
996
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
/*********************************************************************//**
999
/*************************************************************************
1107
1000
Initializes the synchronization primitives, memory system, and the thread
1108
1001
local storage. */
1285
1176
os_fast_mutex_unlock(&srv_conc_mutex);
1288
/*********************************************************************//**
1179
/*************************************************************************
1289
1180
This lets a thread enter InnoDB regardless of the number of threads inside
1290
1181
InnoDB. This must be called when a thread ends a lock wait. */
1293
1184
srv_conc_force_enter_innodb(
1294
1185
/*========================*/
1295
trx_t* trx) /*!< in: transaction object associated with the
1186
trx_t* trx) /* in: transaction object associated with the
1298
1189
if (UNIV_LIKELY(!srv_thread_concurrency)) {
1311
1202
os_fast_mutex_unlock(&srv_conc_mutex);
1314
/*********************************************************************//**
1205
/*************************************************************************
1315
1206
This must be called when a thread exits InnoDB in a lock wait or at the
1316
1207
end of an SQL statement. */
1319
1210
srv_conc_force_exit_innodb(
1320
1211
/*=======================*/
1321
trx_t* trx) /*!< in: transaction object associated with the
1212
trx_t* trx) /* in: transaction object associated with the
1324
1215
srv_conc_slot_t* slot = NULL;
1620
1514
row_mysql_unfreeze_data_dictionary(trx);
1622
1516
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
1517
/* Release fast index creation latch */
1636
1518
row_mysql_unlock_data_dictionary(trx);
1715
1591
trx->error_state = DB_LOCK_WAIT_TIMEOUT;
1718
if (trx_is_interrupted(trx)) {
1720
trx->error_state = DB_INTERRUPTED;
1593
#else /* UNIV_HOTBACKUP */
1594
/* This function depends on MySQL code that is not included in
1595
InnoDB Hot Backup builds. Besides, this function should never
1596
be called in InnoDB Hot Backup. */
1598
#endif /* UNIV_HOTBACKUP */
1724
/********************************************************************//**
1601
/************************************************************************
1725
1602
Releases a MySQL OS thread waiting for a lock to be released, if the
1726
1603
thread is already suspended. */
1729
1606
srv_release_mysql_thread_if_suspended(
1730
1607
/*==================================*/
1731
que_thr_t* thr) /*!< in: query thread associated with the
1608
que_thr_t* thr) /* in: query thread associated with the
1732
1609
MySQL OS thread */
1611
#ifndef UNIV_HOTBACKUP
1734
1612
srv_slot_t* slot;
1780
1665
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 */
1668
/**********************************************************************
1669
Outputs to a file the output of the InnoDB Monitor. */
1789
1672
srv_printf_innodb_monitor(
1790
1673
/*======================*/
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
1674
FILE* file, /* in: output stream */
1675
ulint* trx_start, /* out: file position of the start of
1794
1676
the list of active transactions */
1795
ulint* trx_end) /*!< out: file position of the end of
1677
ulint* trx_end) /* out: file position of the end of
1796
1678
the list of active transactions */
1798
1680
double time_elapsed;
1799
1681
time_t current_time;
1800
1682
ulint n_reserved;
1803
1684
mutex_enter(&srv_innodb_monitor_mutex);
1849
1725
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;
1727
lock_print_info_summary(file);
1729
long t = ftell(file);
1731
*trx_start = ULINT_UNDEFINED;
1733
*trx_start = (ulint) t;
1736
lock_print_info_all_transactions(file);
1738
long t = ftell(file);
1740
*trx_end = ULINT_UNDEFINED;
1742
*trx_end = (ulint) t;
1876
1745
fputs("--------\n"
1878
1747
"--------\n", file);
1970
1839
"============================\n", file);
1971
1840
mutex_exit(&srv_innodb_monitor_mutex);
1977
/******************************************************************//**
1844
/**********************************************************************
1978
1845
Function to pass InnoDB status variables to MySQL */
1981
1848
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
1850
mutex_enter(&srv_innodb_monitor_mutex);
1994
1852
export_vars.innodb_data_pending_reads
2003
1861
export_vars.innodb_data_reads = os_n_file_reads;
2004
1862
export_vars.innodb_data_writes = os_n_file_writes;
2005
1863
export_vars.innodb_data_written = srv_data_written;
2006
export_vars.innodb_buffer_pool_read_requests = stat.n_page_gets;
1864
export_vars.innodb_buffer_pool_read_requests = buf_pool->n_page_gets;
2007
1865
export_vars.innodb_buffer_pool_write_requests
2008
1866
= srv_buf_pool_write_requests;
2009
1867
export_vars.innodb_buffer_pool_wait_free = srv_buf_pool_wait_free;
2010
1868
export_vars.innodb_buffer_pool_pages_flushed = srv_buf_pool_flushed;
2011
1869
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;
1870
export_vars.innodb_buffer_pool_read_ahead_rnd = srv_read_ahead_rnd;
1871
export_vars.innodb_buffer_pool_read_ahead_seq = srv_read_ahead_seq;
1872
export_vars.innodb_buffer_pool_pages_data
1873
= UT_LIST_GET_LEN(buf_pool->LRU);
1874
export_vars.innodb_buffer_pool_pages_dirty
1875
= UT_LIST_GET_LEN(buf_pool->flush_list);
1876
export_vars.innodb_buffer_pool_pages_free
1877
= UT_LIST_GET_LEN(buf_pool->free);
2019
1878
#ifdef UNIV_DEBUG
2020
1879
export_vars.innodb_buffer_pool_pages_latched
2021
1880
= buf_get_latched_pages_number();
2022
1881
#endif /* UNIV_DEBUG */
2023
export_vars.innodb_buffer_pool_pages_total = buf_pool_get_n_pages();
1882
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
1884
export_vars.innodb_buffer_pool_pages_misc = buf_pool->curr_size
1885
- UT_LIST_GET_LEN(buf_pool->LRU)
1886
- UT_LIST_GET_LEN(buf_pool->free);
1887
#ifdef HAVE_GCC_ATOMIC_BUILTINS
2028
1888
export_vars.innodb_have_atomic_builtins = 1;
2030
1890
export_vars.innodb_have_atomic_builtins = 0;
2039
1899
export_vars.innodb_log_writes = srv_log_writes;
2040
1900
export_vars.innodb_dblwr_pages_written = srv_dblwr_pages_written;
2041
1901
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;
1902
export_vars.innodb_pages_created = buf_pool->n_pages_created;
1903
export_vars.innodb_pages_read = buf_pool->n_pages_read;
1904
export_vars.innodb_pages_written = buf_pool->n_pages_written;
2045
1905
export_vars.innodb_row_lock_waits = srv_n_lock_wait_count;
2046
1906
export_vars.innodb_row_lock_current_waits
2047
1907
= srv_n_lock_wait_current_count;
2058
1918
export_vars.innodb_rows_inserted = srv_n_rows_inserted;
2059
1919
export_vars.innodb_rows_updated = srv_n_rows_updated;
2060
1920
export_vars.innodb_rows_deleted = srv_n_rows_deleted;
2061
export_vars.innodb_truncated_status_writes = srv_truncated_status_writes;
2063
1922
mutex_exit(&srv_innodb_monitor_mutex);
2066
/*********************************************************************//**
2067
A thread which prints the info output by various InnoDB monitors.
2068
@return a dummy parameter */
1925
/*************************************************************************
1926
A thread which wakes up threads whose lock wait may have lasted too long.
1927
This also prints the info output by various InnoDB monitors. */
2070
1929
os_thread_ret_t
1930
srv_lock_timeout_and_monitor_thread(
1931
/*================================*/
1932
/* out: a dummy parameter */
2073
1933
void* arg __attribute__((unused)))
2074
/*!< in: a dummy parameter required by
1934
/* in: a dummy parameter required by
2075
1935
os_thread_create */
2077
1938
double time_elapsed;
2078
1939
time_t current_time;
2079
1940
time_t last_table_monitor_time;
2080
1941
time_t last_tablespace_monitor_time;
2081
1942
time_t last_monitor_time;
2082
ulint mutex_skipped;
2083
ibool last_srv_print_monitor;
2085
1947
#ifdef UNIV_DEBUG_THREAD_CREATION
2086
1948
fprintf(stderr, "Lock timeout thread starts, id %lu\n",
2087
1949
os_thread_pf(os_thread_get_curr_id()));
2090
#ifdef UNIV_PFS_THREAD
2091
pfs_register_thread(srv_monitor_thread_key);
2094
1951
UT_NOT_USED(arg);
2095
1952
srv_last_monitor_time = time(NULL);
2096
1953
last_table_monitor_time = time(NULL);
2097
1954
last_tablespace_monitor_time = time(NULL);
2098
1955
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);
1957
srv_lock_timeout_and_monitor_active = TRUE;
1959
/* When someone is waiting for a lock, we wake up every second
1960
and check if a timeout has passed for a lock wait */
1962
os_thread_sleep(1000000);
2109
1964
current_time = time(NULL);
2114
1969
last_monitor_time = time(NULL);
2116
1971
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;
1972
srv_printf_innodb_monitor(stderr, NULL, NULL);
2140
1975
if (srv_innodb_status) {
2141
1976
mutex_enter(&srv_monitor_file_mutex);
2142
1977
rewind(srv_monitor_file);
2143
if (!srv_printf_innodb_monitor(srv_monitor_file,
2144
MUTEX_NOWAIT(mutex_skipped),
1978
srv_printf_innodb_monitor(srv_monitor_file, NULL,
2151
1980
os_file_set_eof(srv_monitor_file);
2152
1981
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
2032
mutex_enter(&kernel_mutex);
2259
2034
some_waits = FALSE;
2329
2109
OS_THREAD_DUMMY_RETURN;
2332
/*********************************************************************//**
2112
/*************************************************************************
2333
2113
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 */
2114
too long. These can be used to track bugs which cause hangs. */
2337
2116
os_thread_ret_t
2338
2117
srv_error_monitor_thread(
2339
2118
/*=====================*/
2119
/* out: a dummy parameter */
2340
2120
void* arg __attribute__((unused)))
2341
/*!< in: a dummy parameter required by
2121
/* in: a dummy parameter required by
2342
2122
os_thread_create */
2344
2124
/* number of successive fatal timeouts observed */
2437
2209
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
/*******************************************************************//**
2212
/***********************************************************************
2466
2213
Tells the InnoDB server that there has been activity in the database
2467
2214
and wakes up the master thread if it is suspended (not sleeping). Used
2468
2215
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). */
2216
thread stays suspended (we do not protect our operation with the kernel
2217
mutex, for performace reasons). */
2473
2220
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
/*******************************************************************//**
2235
/***********************************************************************
2513
2236
Wakes up the master thread if it is suspended or being suspended. */
2525
2248
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 */
2251
/*************************************************************************
2252
The master thread controlling the server. */
2599
2254
os_thread_ret_t
2600
2255
srv_master_thread(
2601
2256
/*==============*/
2257
/* out: a dummy parameter */
2602
2258
void* arg __attribute__((unused)))
2603
/*!< in: a dummy parameter required by
2259
/* in: a dummy parameter required by
2604
2260
os_thread_create */
2606
buf_pool_stat_t buf_stat;
2607
2262
os_event_t event;
2263
time_t last_flush_time;
2264
time_t current_time;
2608
2265
ulint old_activity_count;
2609
2266
ulint n_pages_purged = 0;
2610
2267
ulint n_bytes_merged;
2663
2314
/* ---- We run the following loop approximately once per second
2664
2315
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
2319
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;
2320
n_ios_old = log_sys->n_log_ios + buf_pool->n_pages_read
2321
+ buf_pool->n_pages_written;
2679
2322
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)
2326
os_thread_sleep(1000000);
2693
/* Each iteration should happen at 1 second interval. */
2694
next_itr_time = ut_time_ms() + 1000;
2696
2331
/* ALTER TABLE in MySQL requires on Unix that the table handler
2697
2332
can drop tables lazily after there no longer are SELECT
2708
2343
goto background_loop;
2711
/* Flush logs if needed */
2712
srv_sync_log_buffer_in_background();
2346
/* We flush the log once in a second even if no commit
2347
is issued or the we have specified in my.cnf no flush
2348
at transaction commit */
2350
srv_main_thread_op_info = "flushing log";
2351
log_buffer_flush_to_disk();
2714
2353
srv_main_thread_op_info = "making checkpoint";
2715
2354
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. */
2356
/* If there were less than 5 i/os during the
2357
one second sleep, we assume that there is free
2358
disk i/o capacity available, and it makes sense to
2359
do an insert buffer merge. */
2721
buf_get_total_stat(&buf_stat);
2722
2361
n_pend_ios = buf_get_n_pending_ios()
2723
2362
+ 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)) {
2363
n_ios = log_sys->n_log_ios + buf_pool->n_pages_read
2364
+ buf_pool->n_pages_written;
2365
if (n_pend_ios < 3 && (n_ios - n_ios_old < 5)) {
2728
2366
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();
2367
ibuf_contract_for_n_pages(
2368
TRUE, srv_insert_buffer_batch_size / 4);
2370
srv_main_thread_op_info = "flushing log";
2372
log_buffer_flush_to_disk();
2735
2375
if (UNIV_UNLIKELY(buf_get_modified_ratio_pct()
2738
2378
/* Try to keep the number of modified pages in the
2739
2379
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);
2381
n_pages_flushed = buf_flush_batch(BUF_FLUSH_LIST, 100,
2384
/* If we had to do the flush, it may have taken
2385
even more than 1 second, and also, there may be more
2386
to flush. Do not sleep 1 second during the next
2387
iteration of this loop. */
2764
2392
if (srv_activity_count == old_activity_count) {
2779
2407
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);
2409
/* If there were less than 200 i/os during the 10 second period,
2410
we assume that there is free disk i/o capacity available, and it
2411
makes sense to flush 100 pages. */
2791
2413
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)) {
2414
n_ios = log_sys->n_log_ios + buf_pool->n_pages_read
2415
+ buf_pool->n_pages_written;
2416
if (n_pend_ios < 3 && (n_ios - n_ios_very_old < 200)) {
2799
2418
srv_main_thread_op_info = "flushing buffer pool pages";
2800
buf_flush_list(PCT_IO(100), IB_ULONGLONG_MAX);
2419
buf_flush_batch(BUF_FLUSH_LIST, 100, IB_ULONGLONG_MAX);
2802
/* Flush logs if needed */
2803
srv_sync_log_buffer_in_background();
2421
srv_main_thread_op_info = "flushing log";
2422
log_buffer_flush_to_disk();
2806
2425
/* We run a batch of insert buffer merge every 10 seconds,
2807
2426
even if the server were active */
2809
2428
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();
2429
ibuf_contract_for_n_pages(TRUE, srv_insert_buffer_batch_size / 4);
2431
srv_main_thread_op_info = "flushing log";
2432
log_buffer_flush_to_disk();
2434
/* We run a full purge every 10 seconds, even if the server
2437
last_flush_time = time(NULL);
2820
2441
if (srv_fast_shutdown && srv_shutdown_state > 0) {
2822
2443
goto background_loop;
2446
srv_main_thread_op_info = "purging";
2447
n_pages_purged = trx_purge();
2449
current_time = time(NULL);
2451
if (difftime(current_time, last_flush_time) > 1) {
2452
srv_main_thread_op_info = "flushing log";
2454
log_buffer_flush_to_disk();
2455
last_flush_time = current_time;
2457
} while (n_pages_purged);
2826
2459
srv_main_thread_op_info = "flushing buffer pool pages";
2833
2466
(> 70 %), we assume we can afford reserving the disk(s) for
2834
2467
the time it requires to flush 100 pages */
2836
n_pages_flushed = buf_flush_list(
2837
PCT_IO(100), IB_ULONGLONG_MAX);
2469
n_pages_flushed = buf_flush_batch(BUF_FLUSH_LIST, 100,
2839
2472
/* Otherwise, we only flush a small number of pages so that
2840
2473
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);
2476
n_pages_flushed = buf_flush_batch(BUF_FLUSH_LIST, 10,
2847
2480
srv_main_thread_op_info = "making checkpoint";
2888
2521
os_thread_sleep(100000);
2891
if (srv_n_purge_threads == 0) {
2892
srv_main_thread_op_info = "master purging";
2894
srv_master_do_purge();
2524
srv_main_thread_op_info = "purging";
2526
/* Run a full purge */
2528
last_flush_time = time(NULL);
2531
if (srv_fast_shutdown && srv_shutdown_state > 0) {
2536
srv_main_thread_op_info = "purging";
2537
n_pages_purged = trx_purge();
2539
current_time = time(NULL);
2541
if (difftime(current_time, last_flush_time) > 1) {
2542
srv_main_thread_op_info = "flushing log";
2544
log_buffer_flush_to_disk();
2545
last_flush_time = current_time;
2547
} while (n_pages_purged);
2897
2549
srv_main_thread_op_info = "reserving kernel mutex";
2908
2560
if (srv_fast_shutdown && srv_shutdown_state > 0) {
2909
2561
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,
2563
n_bytes_merged = ibuf_contract_for_n_pages(
2564
TRUE, srv_insert_buffer_batch_size);
2919
2567
srv_main_thread_op_info = "reserving kernel mutex";
3047
#if (!defined(__SUNPRO_C) && !defined(__SUNPRO_CC))
2695
#ifndef UNIV_SOLARIS
3048
2696
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);
2699
#endif /* !UNIV_HOTBACKUP */