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Correct the value of global memory_used

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As a special hack global memory_used isn't SHOW_LONG_STATUS
but still relies on calc_sum_of_all_status() being called.

followup for 63f91927870
This commit is contained in:
Sergei Golubchik 2021-03-07 01:33:51 +01:00
parent 2c0b3141f3
commit dc6667805d
5 changed files with 40 additions and 14 deletions
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10
mysql-test/r/status2.result
View File

@ -74,4 +74,12 @@ DROP TRIGGER trigg1;
DROP FUNCTION testQuestion;
DROP EVENT ev1;
DROP TABLE t1,t2;
End of 6.0 tests
#
# End of 5.5 tests
#
select variable_value < 1024*1024*1024 from information_schema.global_status where variable_name='memory_used';
variable_value < 1024*1024*1024
1
#
# End of 10.2 tests
#

11
mysql-test/t/status2.test
View File

@ -64,5 +64,14 @@ DROP TRIGGER trigg1;
DROP FUNCTION testQuestion;
DROP EVENT ev1;
DROP TABLE t1,t2;
--echo End of 6.0 tests
--echo #
--echo # End of 5.5 tests
--echo #
select variable_value < 1024*1024*1024 from information_schema.global_status where variable_name='memory_used';
--echo #
--echo # End of 10.2 tests
--echo #

3
sql/mysqld.cc
View File

@ -8441,8 +8441,11 @@ static int show_memory_used(THD *thd, SHOW_VAR *var, char *buff,
var->type= SHOW_LONGLONG;
var->value= buff;
if (scope == OPT_GLOBAL)
{
calc_sum_of_all_status_if_needed(status_var);
*(longlong*) buff= (status_var->global_memory_used +
status_var->local_memory_used);
}
else
*(longlong*) buff= status_var->local_memory_used;
return 0;

19
sql/sql_class.h
View File

@ -865,11 +865,24 @@ void add_to_status(STATUS_VAR *to_var, STATUS_VAR *from_var);
void add_diff_to_status(STATUS_VAR *to_var, STATUS_VAR *from_var,
STATUS_VAR *dec_var);
uint calc_sum_of_all_status(STATUS_VAR *to);
static inline void calc_sum_of_all_status_if_needed(STATUS_VAR *to)
{
if (to->local_memory_used == 0)
{
mysql_mutex_lock(&LOCK_status);
*to= global_status_var;
mysql_mutex_unlock(&LOCK_status);
calc_sum_of_all_status(to);
DBUG_ASSERT(to->local_memory_used);
}
}
/*
Update global_memory_used. We have to do this with atomic_add as the
global value can change outside of LOCK_status.
*/
inline void update_global_memory_status(int64 size)
static inline void update_global_memory_status(int64 size)
{
DBUG_PRINT("info", ("global memory_used: %lld size: %lld",
(longlong) global_status_var.global_memory_used,
@ -887,7 +900,7 @@ inline void update_global_memory_status(int64 size)
@retval NULL on error
@retval Pointter to CHARSET_INFO with the given name on success
*/
inline CHARSET_INFO *
static inline CHARSET_INFO *
mysqld_collation_get_by_name(const char *name,
CHARSET_INFO *name_cs= system_charset_info)
{
@ -906,7 +919,7 @@ mysqld_collation_get_by_name(const char *name,
return cs;
}
inline bool is_supported_parser_charset(CHARSET_INFO *cs)
static inline bool is_supported_parser_charset(CHARSET_INFO *cs)
{
return MY_TEST(cs->mbminlen == 1);
}

11
sql/sql_show.cc
View File

@ -3580,15 +3580,8 @@ static bool show_status_array(THD *thd, const char *wild,
if (show_type == SHOW_SYS)
mysql_mutex_lock(&LOCK_global_system_variables);
else if (show_type >= SHOW_LONG_STATUS && scope == OPT_GLOBAL &&
!status_var->local_memory_used)
{
mysql_mutex_lock(&LOCK_status);
*status_var= global_status_var;
mysql_mutex_unlock(&LOCK_status);
calc_sum_of_all_status(status_var);
DBUG_ASSERT(status_var->local_memory_used);
}
else if (show_type >= SHOW_LONG_STATUS && scope == OPT_GLOBAL)
calc_sum_of_all_status_if_needed(status_var);
pos= get_one_variable(thd, var, scope, show_type, status_var,
&charset, buff, &length);