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Follow-up to MDEV-12266: Remove latch_t::m_temp_fsp

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There is only one temporary tablespace. Reserving a data member in
each read-write lock object for a Boolean flag seems like a huge waste,
especially because this field was only actually used in debug builds.

LatchDebug::check_order(): Compare to fil_system.temp_space->latch.
This commit is contained in:
Marko Mäkelä 2018-07-23 12:09:59 +03:00
parent 141a5b2484
commit b9865b289a
3 changed files with 6 additions and 37 deletions
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1
storage/innobase/fil/fil0fil.cc
View File

@ -1480,7 +1480,6 @@ fil_space_create(
rw_lock_create(fil_space_latch_key, &space->latch, SYNC_FSP);
if (space->purpose == FIL_TYPE_TEMPORARY) {
ut_d(space->latch.set_temp_fsp());
/* SysTablespace::open_or_create() would pass
size!=0 to fil_node_create(), so first_time_open
would not hold in fil_node_open_file(), and we

24
storage/innobase/include/sync0types.h
View File

@ -979,8 +979,7 @@ struct latch_t {
UNIV_NOTHROW
:
m_id(id),
m_rw_lock(),
m_temp_fsp() { }
m_rw_lock() {}
/** Destructor */
virtual ~latch_t() UNIV_NOTHROW { }
@ -1014,24 +1013,6 @@ struct latch_t {
return(sync_latch_get_level(m_id));
}
/** @return true if the latch is for a temporary file space*/
bool is_temp_fsp() const
UNIV_NOTHROW
{
return(m_temp_fsp);
}
/** Set the temporary tablespace flag. (For internal temporary
tables, MySQL 5.7 does not always acquire the index->lock. We
need to figure out the context and add some special rules
during the checks.) */
void set_temp_fsp()
UNIV_NOTHROW
{
ut_ad(get_id() == LATCH_ID_FIL_SPACE);
m_temp_fsp = true;
}
/** @return the latch name, m_id must be set */
const char* get_name() const
UNIV_NOTHROW
@ -1047,9 +1028,6 @@ struct latch_t {
/** true if it is a rw-lock. In debug mode, rw_lock_t derives from
this class and sets this variable. */
bool m_rw_lock;
/** true if it is an temporary space latch */
bool m_temp_fsp;
};
/** Subclass this to iterate over a thread's acquired latch levels. */

18
storage/innobase/sync/sync0debug.cc
View File

@ -35,6 +35,7 @@ Created 2012-08-21 Sunny Bains
#include "ut0new.h"
#include "srv0start.h"
#include "fil0fil.h"
#include <map>
#include <vector>
@ -910,19 +911,10 @@ LatchDebug::check_order(
case SYNC_TREE_NODE:
{
const latch_t* fsp_latch;
fsp_latch = find(latches, SYNC_FSP);
ut_a((fsp_latch != NULL
&& fsp_latch->is_temp_fsp())
|| find(latches, SYNC_INDEX_TREE) != 0
|| find(latches, SYNC_DICT_OPERATION)
|| basic_check(latches,
level, SYNC_TREE_NODE - 1));
}
ut_a(find(latches, SYNC_FSP) == &fil_system.temp_space->latch
|| find(latches, SYNC_INDEX_TREE)
|| find(latches, SYNC_DICT_OPERATION)
|| basic_check(latches, level, SYNC_TREE_NODE - 1));
break;
case SYNC_TREE_NODE_NEW: