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Yet less TDC hash lookups

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Let auto repair table and truncate table routines flush TABLE_SHARE
directly.

Part of MDEV-17882 - Cleanup refresh version
This commit is contained in:
Sergey Vojtovich 2019-12-21 23:51:49 +04:00
parent 7a947614fb
commit 4197014ba0
4 changed files with 22 additions and 21 deletions
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4
sql/sql_base.cc
View File

@ -2942,9 +2942,7 @@ static bool auto_repair_table(THD *thd, TABLE_LIST *table_list)
result= FALSE;
}
tdc_release_share(share);
/* Remove the repaired share from the table cache. */
tdc_remove_table(thd, table_list->db.str, table_list->table_name.str);
tdc_remove_referenced_share(thd, share);
end_free:
my_free(entry);
return result;

11
sql/sql_truncate.cc
View File

@ -336,7 +336,10 @@ bool Sql_cmd_truncate_table::lock_table(THD *thd, TABLE_LIST *table_ref,
}
#endif
tdc_release_share(share);
if (!versioned)
tdc_remove_referenced_share(thd, share);
else
tdc_release_share(share);
if (hton == view_pseudo_hton)
{
@ -372,12 +375,6 @@ bool Sql_cmd_truncate_table::lock_table(THD *thd, TABLE_LIST *table_ref,
if (*hton_can_recreate)
close_all_tables_for_name(thd, table->s, HA_EXTRA_NOT_USED, NULL);
}
else
{
/* Table is already locked exclusively. Remove cached instances. */
tdc_remove_table(thd, table_ref->db.str, table_ref->table_name.str);
}
DBUG_RETURN(FALSE);
}

27
sql/table_cache.cc
View File

@ -996,6 +996,20 @@ void tdc_release_share(TABLE_SHARE *share)
}
void tdc_remove_referenced_share(THD *thd, TABLE_SHARE *share)
{
DBUG_ASSERT(thd->mdl_context.is_lock_owner(MDL_key::TABLE, share->db.str,
share->table_name.str,
MDL_EXCLUSIVE));
share->tdc->flush_unused(false);
mysql_mutex_lock(&share->tdc->LOCK_table_share);
share->tdc->wait_for_refs(1);
DBUG_ASSERT(share->tdc->all_tables.is_empty());
share->tdc->ref_count--;
tdc_delete_share_from_hash(share->tdc);
}
/**
Removes all TABLE instances and corresponding TABLE_SHARE
@ -1009,7 +1023,6 @@ void tdc_release_share(TABLE_SHARE *share)
void tdc_remove_table(THD *thd, const char *db, const char *table_name)
{
Share_free_tables::List purge_tables;
TDC_element *element;
DBUG_ENTER("tdc_remove_table");
DBUG_PRINT("enter", ("name: %s", table_name));
@ -1042,18 +1055,10 @@ void tdc_remove_table(THD *thd, const char *db, const char *table_name)
mysql_mutex_unlock(&LOCK_unused_shares);
element->ref_count++;
tc_remove_all_unused_tables(element, &purge_tables);
mysql_mutex_unlock(&element->LOCK_table_share);
while (auto table= purge_tables.pop_front())
intern_close_table(table);
mysql_mutex_lock(&element->LOCK_table_share);
element->wait_for_refs(1);
DBUG_ASSERT(element->all_tables.is_empty());
element->ref_count--;
tdc_delete_share_from_hash(element);
/* We have to relock the mutex to avoid code duplication. Sigh. */
tdc_remove_referenced_share(thd, element->share);
DBUG_VOID_RETURN;
}

1
sql/table_cache.h
View File

@ -77,6 +77,7 @@ int tdc_share_is_cached(THD *thd, const char *db, const char *table_name);
extern TABLE_SHARE *tdc_acquire_share(THD *thd, TABLE_LIST *tl, uint flags,
TABLE **out_table= 0);
extern void tdc_release_share(TABLE_SHARE *share);
void tdc_remove_referenced_share(THD *thd, TABLE_SHARE *share);
void tdc_remove_table(THD *thd, const char *db, const char *table_name);
extern int tdc_wait_for_old_version(THD *thd, const char *db,