Added DBUG_PUSH_EMPTY and DBUG_POP_EMPTY to speed up DBUG

include/my_dbug.h

@@ -106,6 +106,9 @@ extern int (*dbug_sanity)(void);
         (_db_keyword_(0,(keyword), 1) ? (a1) : (a2))
 #define DBUG_PRINT(keyword,arglist) \
         do if (_db_pargs_(__LINE__,keyword)) _db_doprnt_ arglist; while(0)
+
+#define DBUG_PUSH_EMPTY if (_dbug_on_) { DBUG_PUSH(""); }
+#define DBUG_POP_EMPTY  if (_dbug_on_) { DBUG_POP(); }
 #define DBUG_PUSH(a1) _db_push_ (a1)
 #define DBUG_POP() _db_pop_ ()
 #define DBUG_SET(a1) _db_set_ (a1)
@@ -172,6 +175,8 @@ extern void _db_suicide_(void);
 #define DBUG_EVALUATE(keyword,a1,a2) (a2)
 #define DBUG_EVALUATE_IF(keyword,a1,a2) (a2)
 #define DBUG_PRINT(keyword,arglist)     do { } while(0)
+#define DBUG_PUSH_EMPTY                 do { } while(0)
+#define DBUG_POP_EMPTY                  do { } while(0)
 #define DBUG_PUSH(a1)                   do { } while(0)
 #define DBUG_SET(a1)                    do { } while(0)
 #define DBUG_SET_INITIAL(a1)            do { } while(0)

mysys/thr_mutex.c

@@ -233,7 +233,7 @@ int safe_mutex_lock(safe_mutex_t *mp, myf my_flags, const char *file,
   int error;
   DBUG_PRINT("mutex", ("%s (0x%lx) locking", mp->name ? mp->name : "Null",
                        (ulong) mp));
-  DBUG_PUSH("");
+  DBUG_PUSH_EMPTY;
 
   pthread_mutex_lock(&mp->global);
   if (!mp->file)
@@ -395,7 +395,7 @@ int safe_mutex_lock(safe_mutex_t *mp, myf my_flags, const char *file,
   }
 
 end:
-  DBUG_POP();
+  DBUG_POP_EMPTY;
   if (!error)
     DBUG_PRINT("mutex", ("%s (0x%lx) locked", mp->name, (ulong) mp));
   return error;

sql/filesort.cc

@@ -215,7 +215,7 @@ SORT_INFO *filesort(THD *thd, TABLE *table, Filesort *filesort,
 
   DBUG_EXECUTE("info",TEST_filesort(filesort->sortorder, s_length););
 #ifdef SKIP_DBUG_IN_FILESORT
-  DBUG_PUSH("");		/* No DBUG here */
+  DBUG_PUSH_EMPTY;		/* No DBUG here */
 #endif
   SORT_INFO *sort;
   TABLE_LIST *tab= table->pos_in_table_list;
@@ -493,7 +493,7 @@ SORT_INFO *filesort(THD *thd, TABLE *table, Filesort *filesort,
   sort->examined_rows= param.examined_rows;
   sort->return_rows= num_rows;
 #ifdef SKIP_DBUG_IN_FILESORT
-  DBUG_POP();			/* Ok to DBUG */
+  DBUG_POP_EMPTY;		/* Ok to DBUG */
 #endif
 
   DBUG_PRINT("exit",