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Use less memory on stack in sql_parse.cc and in repair/check for MyISAM & Aria

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sql/sql_parse.cc:
  Make some not commonly used functions with big local variables to separate functions to make default stack usage smaller.
  Decrease size of db_buff[] (Was bigger than needed)
  Allocate current_global_status_var with malloc().
storage/maria/ha_maria.cc:
  Don't allocate HA_CHECK on stack (it's > 100K)
storage/maria/ma_check.c:
  Removed duplicated code
This commit is contained in:
Michael Widenius
2010-10-12 20:40:46 +03:00
parent 2f85f78db4
commit 236141d4f6
4 changed files with 128 additions and 72 deletions
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115
sql/sql_parse.cc
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@@ -48,6 +48,9 @@
"FUNCTION" : "PROCEDURE")
static bool execute_sqlcom_select(THD *thd, TABLE_LIST *all_tables);
static bool execute_show_status(THD *thd, TABLE_LIST *all_tables);
static bool execute_rename_table(THD *thd, TABLE_LIST *first_table,
TABLE_LIST *all_tables);
static bool check_show_create_table_access(THD *thd, TABLE_LIST *table);
const char *any_db="*any*"; // Special symbol for check_access
@@ -1125,7 +1128,7 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
Cast *passwd to an unsigned char, so that it doesn't extend the sign
for *passwd > 127 and become 2**32-127 after casting to uint.
*/
char db_buff[SAFE_NAME_LEN*2+1]; // buffer to store db in utf8
char db_buff[SAFE_NAME_LEN+1]; // buffer to store db in utf8
char *db= passwd;
char *save_db;
/*
@@ -1556,7 +1559,7 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
#endif
case COM_STATISTICS:
{
STATUS_VAR current_global_status_var;
STATUS_VAR *current_global_status_var; // Big; Don't allocate on stack
ulong uptime;
#if defined(SAFEMALLOC) || !defined(EMBEDDED_LIBRARY)
uint length;
@@ -1565,9 +1568,12 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
char buff[250];
uint buff_len= sizeof(buff);
if (!(current_global_status_var= (STATUS_VAR*)
thd->alloc(sizeof(STATUS_VAR))))
break;
general_log_print(thd, command, NullS);
status_var_increment(thd->status_var.com_stat[SQLCOM_SHOW_STATUS]);
calc_sum_of_all_status(&current_global_status_var);
calc_sum_of_all_status(current_global_status_var);
if (!(uptime= (ulong) (thd->start_time - server_start_time)))
queries_per_second1000= 0;
else
@@ -1582,8 +1588,8 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
"Open tables: %u Queries per second avg: %u.%u",
uptime,
(int) thread_count, (ulong) thd->query_id,
current_global_status_var.long_query_count,
current_global_status_var.opened_tables,
current_global_status_var->long_query_count,
current_global_status_var->opened_tables,
refresh_version,
cached_open_tables(),
(uint) (queries_per_second1000 / 1000),
@@ -2285,22 +2291,7 @@ mysql_execute_command(THD *thd)
break;
case SQLCOM_SHOW_STATUS:
{
system_status_var old_status_var= thd->status_var;
thd->initial_status_var= &old_status_var;
if (!(res= check_table_access(thd, SELECT_ACL, all_tables, UINT_MAX, FALSE)))
res= execute_sqlcom_select(thd, all_tables);
/* Don't log SHOW STATUS commands to slow query log */
thd->server_status&= ~(SERVER_QUERY_NO_INDEX_USED |
SERVER_QUERY_NO_GOOD_INDEX_USED);
/*
restore status variables, as we don't want 'show status' to cause
changes
*/
pthread_mutex_lock(&LOCK_status);
add_diff_to_status(&global_status_var, &thd->status_var,
&old_status_var);
thd->status_var= old_status_var;
pthread_mutex_unlock(&LOCK_status);
execute_show_status(thd, all_tables);
break;
}
case SQLCOM_SHOW_DATABASES:
@@ -3005,31 +2996,7 @@ end_with_restore_list:
}
case SQLCOM_RENAME_TABLE:
{
DBUG_ASSERT(first_table == all_tables && first_table != 0);
TABLE_LIST *table;
for (table= first_table; table; table= table->next_local->next_local)
{
if (check_access(thd, ALTER_ACL | DROP_ACL, table->db,
&table->grant.privilege,0,0, test(table->schema_table)) ||
check_access(thd, INSERT_ACL | CREATE_ACL, table->next_local->db,
&table->next_local->grant.privilege, 0, 0,
test(table->next_local->schema_table)))
goto error;
TABLE_LIST old_list, new_list;
/*
we do not need initialize old_list and new_list because we will
come table[0] and table->next[0] there
*/
old_list= table[0];
new_list= table->next_local[0];
if (check_grant(thd, ALTER_ACL | DROP_ACL, &old_list, 0, 1, 0) ||
(!test_all_bits(table->next_local->grant.privilege,
INSERT_ACL | CREATE_ACL) &&
check_grant(thd, INSERT_ACL | CREATE_ACL, &new_list, 0, 1, 0)))
goto error;
}
if (end_active_trans(thd) || mysql_rename_tables(thd, first_table, 0))
if (execute_rename_table(thd, first_table, all_tables))
goto error;
break;
}
@@ -5172,6 +5139,62 @@ static bool execute_sqlcom_select(THD *thd, TABLE_LIST *all_tables)
}
static bool execute_show_status(THD *thd, TABLE_LIST *all_tables)
{
bool res;
system_status_var old_status_var= thd->status_var;
thd->initial_status_var= &old_status_var;
if (!(res= check_table_access(thd, SELECT_ACL, all_tables, UINT_MAX, FALSE)))
res= execute_sqlcom_select(thd, all_tables);
/* Don't log SHOW STATUS commands to slow query log */
thd->server_status&= ~(SERVER_QUERY_NO_INDEX_USED |
SERVER_QUERY_NO_GOOD_INDEX_USED);
/*
restore status variables, as we don't want 'show status' to cause
changes
*/
pthread_mutex_lock(&LOCK_status);
add_diff_to_status(&global_status_var, &thd->status_var,
&old_status_var);
thd->status_var= old_status_var;
pthread_mutex_unlock(&LOCK_status);
return res;
}
static bool execute_rename_table(THD *thd, TABLE_LIST *first_table,
TABLE_LIST *all_tables)
{
DBUG_ASSERT(first_table == all_tables && first_table != 0);
TABLE_LIST *table;
for (table= first_table; table; table= table->next_local->next_local)
{
if (check_access(thd, ALTER_ACL | DROP_ACL, table->db,
&table->grant.privilege,0,0, test(table->schema_table)) ||
check_access(thd, INSERT_ACL | CREATE_ACL, table->next_local->db,
&table->next_local->grant.privilege, 0, 0,
test(table->next_local->schema_table)))
return 1;
TABLE_LIST old_list, new_list;
/*
we do not need initialize old_list and new_list because we will
come table[0] and table->next[0] there
*/
old_list= table[0];
new_list= table->next_local[0];
if (check_grant(thd, ALTER_ACL | DROP_ACL, &old_list, 0, 1, 0) ||
(!test_all_bits(table->next_local->grant.privilege,
INSERT_ACL | CREATE_ACL) &&
check_grant(thd, INSERT_ACL | CREATE_ACL, &new_list, 0, 1, 0)))
return 1;
}
if (end_active_trans(thd) || mysql_rename_tables(thd, first_table, 0))
return 1;
return 0;
}
#ifndef NO_EMBEDDED_ACCESS_CHECKS
/**
Check grants for commands which work only with one table.