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MDEV-24544 innodb_buffer_pool_wait_free is not protected by mutex

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buf_LRU_get_free_block(): Increment the counter after acquiring
buf_pool.mutex.

buf_pool.stat.LRU_waits: Replaces export_vars.innodb_buffer_pool_wait_free
and srv_stats.buf_pool_wait_free.

Reads of the counter will remain dirty, not acquiring the mutex.
This commit is contained in:
Marko Mäkelä 2021-01-07 11:18:13 +02:00
parent a993310593
commit fae87e0c74
6 changed files with 15 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
storage/innobase/buf/buf0lru.cc
View File

@ -1,7 +1,7 @@
/*****************************************************************************
Copyright (c) 1995, 2016, Oracle and/or its affiliates. All Rights Reserved.
Copyright (c) 2017, 2020, MariaDB Corporation.
Copyright (c) 2017, 2021, MariaDB Corporation.
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
@ -410,7 +410,6 @@ buf_block_t* buf_LRU_get_free_block(bool have_mutex)
mysql_mutex_assert_owner(&buf_pool.mutex);
goto got_mutex;
}
loop:
mysql_mutex_lock(&buf_pool.mutex);
got_mutex:
buf_LRU_check_size_of_non_data_objects();
@ -493,11 +492,10 @@ not_found:
++flush_failures;
}
srv_stats.buf_pool_wait_free.inc();
n_iterations++;
goto loop;
mysql_mutex_lock(&buf_pool.mutex);
buf_pool.stat.LRU_waits++;
goto got_mutex;
}
/** Move the LRU_old pointer so that the length of the old blocks list

5
storage/innobase/handler/ha_innodb.cc
View File

@ -4,7 +4,7 @@ Copyright (c) 2000, 2020, Oracle and/or its affiliates. All Rights Reserved.
Copyright (c) 2008, 2009 Google Inc.
Copyright (c) 2009, Percona Inc.
Copyright (c) 2012, Facebook Inc.
Copyright (c) 2013, 2020, MariaDB Corporation.
Copyright (c) 2013, 2021, MariaDB Corporation.
Portions of this file contain modifications contributed and copyrighted by
Google, Inc. Those modifications are gratefully acknowledged and are described
@ -919,8 +919,7 @@ static SHOW_VAR innodb_status_variables[]= {
&export_vars.innodb_buffer_pool_read_requests, SHOW_SIZE_T},
{"buffer_pool_reads",
&export_vars.innodb_buffer_pool_reads, SHOW_SIZE_T},
{"buffer_pool_wait_free",
&export_vars.innodb_buffer_pool_wait_free, SHOW_SIZE_T},
{"buffer_pool_wait_free", &buf_pool.stat.LRU_waits, SHOW_SIZE_T},
{"buffer_pool_write_requests",
&export_vars.innodb_buffer_pool_write_requests, SHOW_SIZE_T},
{"checkpoint_age", &export_vars.innodb_checkpoint_age, SHOW_SIZE_T},

8
storage/innobase/include/buf0buf.h
View File

@ -1,7 +1,7 @@
/*****************************************************************************
Copyright (c) 1995, 2016, Oracle and/or its affiliates. All Rights Reserved.
Copyright (c) 2013, 2020, MariaDB Corporation.
Copyright (c) 2013, 2021, MariaDB Corporation.
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
@ -1355,6 +1355,8 @@ struct buf_pool_stat_t{
young because the first access
was not long enough ago, in
buf_page_peek_if_too_old() */
/** number of waits for eviction; writes protected by buf_pool.mutex */
ulint LRU_waits;
ulint LRU_bytes; /*!< LRU size in bytes */
ulint flush_list_bytes;/*!< flush_list size in bytes */
};
@ -1789,7 +1791,7 @@ public:
static constexpr uint32_t READ_AHEAD_PAGES= 64;
/** Buffer pool mutex */
mysql_mutex_t mutex;
MY_ALIGNED(CPU_LEVEL1_DCACHE_LINESIZE) mysql_mutex_t mutex;
/** Number of pending LRU flush. */
Atomic_counter<ulint> n_flush_LRU;
/** broadcast when n_flush_LRU reaches 0; protected by mutex */
@ -1936,7 +1938,7 @@ public:
/** mutex protecting flush_list, buf_page_t::set_oldest_modification()
and buf_page_t::list pointers when !oldest_modification() */
mysql_mutex_t flush_list_mutex;
MY_ALIGNED(CPU_LEVEL1_DCACHE_LINESIZE) mysql_mutex_t flush_list_mutex;
/** "hazard pointer" for flush_list scans; protected by flush_list_mutex */
FlushHp flush_hp;
/** modified blocks (a subset of LRU) */

8
storage/innobase/include/srv0srv.h
View File

@ -88,11 +88,6 @@ struct srv_stats_t
/** Store the number of write requests issued */
ulint_ctr_1_t buf_pool_write_requests;
/** Store the number of times when we had to wait for a free page
in the buffer pool. It happens when the buffer pool is full and we
need to make a flush, in order to be able to read or create a page. */
ulint_ctr_1_t buf_pool_wait_free;
/** Number of buffer pool reads that led to the reading of
a disk page */
ulint_ctr_1_t buf_pool_reads;
@ -736,8 +731,7 @@ struct export_var_t{
ulint innodb_buffer_pool_pages_old;
ulint innodb_buffer_pool_read_requests; /*!< buf_pool.stat.n_page_gets */
ulint innodb_buffer_pool_reads; /*!< srv_buf_pool_reads */
ulint innodb_buffer_pool_wait_free; /*!< srv_buf_pool_wait_free */
ulint innodb_buffer_pool_write_requests;/*!< srv_buf_pool_write_requests */
ulint innodb_buffer_pool_write_requests;/*!< srv_stats.buf_pool_write_requests */
ulint innodb_buffer_pool_read_ahead_rnd;/*!< srv_read_ahead_rnd */
ulint innodb_buffer_pool_read_ahead; /*!< srv_read_ahead */
ulint innodb_buffer_pool_read_ahead_evicted;/*!< srv_read_ahead evicted*/

4
storage/innobase/srv/srv0mon.cc
View File

@ -2,7 +2,7 @@
Copyright (c) 2010, 2016, Oracle and/or its affiliates. All Rights Reserved.
Copyright (c) 2012, Facebook Inc.
Copyright (c) 2013, 2020, MariaDB Corporation.
Copyright (c) 2013, 2021, MariaDB Corporation.
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
@ -1565,7 +1565,7 @@ srv_mon_process_existing_counter(
/* innodb_buffer_pool_wait_free */
case MONITOR_OVLD_BUF_POOL_WAIT_FREE:
value = srv_stats.buf_pool_wait_free;
value = buf_pool.stat.LRU_waits;
break;
/* innodb_buffer_pool_read_ahead */

5
storage/innobase/srv/srv0srv.cc
View File

@ -3,7 +3,7 @@
Copyright (c) 1995, 2017, Oracle and/or its affiliates. All Rights Reserved.
Copyright (c) 2008, 2009 Google Inc.
Copyright (c) 2009, Percona Inc.
Copyright (c) 2013, 2020, MariaDB Corporation.
Copyright (c) 2013, 2021, MariaDB Corporation.
Portions of this file contain modifications contributed and copyrighted by
Google, Inc. Those modifications are gratefully acknowledged and are described
@ -1111,9 +1111,6 @@ srv_export_innodb_status(void)
export_vars.innodb_buffer_pool_write_requests =
srv_stats.buf_pool_write_requests;
export_vars.innodb_buffer_pool_wait_free =
srv_stats.buf_pool_wait_free;
export_vars.innodb_buffer_pool_reads = srv_stats.buf_pool_reads;
export_vars.innodb_buffer_pool_read_ahead_rnd =