--- mysql-5.0.75-clean/innobase/lock/lock0lock.c	2008-12-30 01:27:41.000000000 +0100
+++ mysql-5.0.75/innobase/lock/lock0lock.c	2008-12-30 02:25:38.000000000 +0100
@@ -363,6 +363,7 @@
 /* Flags for recursive deadlock search */
 #define LOCK_VICTIM_IS_START	1
 #define LOCK_VICTIM_IS_OTHER	2
+#define trx_deadlock_counter	0
 
 /************************************************************************
 Checks if a lock request results in a deadlock. */
@@ -3206,6 +3207,7 @@
 		}
 
 		lock_deadlock_found = TRUE;
+		srv_trx_deadlock_counter++;
 
 		fputs("*** WE ROLL BACK TRANSACTION (2)\n",
 			lock_latest_err_file);
@@ -3368,7 +3370,8 @@
 				}		
 
 				lock_deadlock_found = TRUE;
-
+				srv_trx_deadlock_counter++;
+				
 				/* Let us choose the transaction of wait_lock
 				as a victim to try to avoid deadlocking our
 				recursion starting point transaction */
@@ -4238,6 +4241,11 @@
 	innobase_mysql_prepare_print_arbitrary_thd();
 	lock_mutex_enter_kernel();
 
+		fprintf(file, 
+				"------------------------\n" 
+				"AMOUNT OF DEADLOCKS: %d\n"
+				"------------------------\n", srv_trx_deadlock_counter);
+	
 	if (lock_deadlock_found) {
 		fputs(
 "------------------------\n" 
--- mysql-5.0.75-clean/sql/ha_innodb.cc	2008-12-30 01:27:41.000000000 +0100
+++ mysql-5.0.75/sql/ha_innodb.cc	2008-12-30 02:20:33.000000000 +0100
@@ -324,6 +324,8 @@
   (char*) &export_vars.innodb_rows_read,                  SHOW_LONG},
   {"rows_updated",
   (char*) &export_vars.innodb_rows_updated,               SHOW_LONG},
+  {"trx_deadlocks",
+  (char*) &export_vars.innodb_trx_deadlocks,			  SHOW_LONG},
   {NullS, NullS, SHOW_LONG}};
 
 /* General functions */
--- mysql-5.0.75-clean/innobase/include/srv0srv.h	2008-12-30 01:27:41.000000000 +0100
+++ mysql-5.0.75/innobase/include/srv0srv.h	2008-12-30 02:29:12.000000000 +0100
@@ -563,6 +563,7 @@
         ulint innodb_rows_inserted;
         ulint innodb_rows_updated;
         ulint innodb_rows_deleted;
+		ulint innodb_trx_deadlocks;
 };
 
 /* The server system struct */
--- mysql-5.0.75-clean/innobase/srv/srv0srv.c	2008-12-30 01:27:41.000000000 +0100
+++ mysql-5.0.75/innobase/srv/srv0srv.c	2008-12-30 02:14:43.000000000 +0100
@@ -1,4 +1,4 @@
-/******************************************************
+	/******************************************************
 The database server main program
 
 NOTE: SQL Server 7 uses something which the documentation
@@ -187,6 +187,9 @@
 
 ulong	srv_max_buf_pool_modified_pct	= 90;
 
+/* counting amount of deadlocks */
+ulint srv_trx_deadlock_counter = 0;
+
 /* variable counts amount of data read in total (in bytes) */
 ulint srv_data_read = 0;
 
@@ -1836,6 +1839,7 @@
         export_vars.innodb_rows_inserted= srv_n_rows_inserted;
         export_vars.innodb_rows_updated= srv_n_rows_updated;
         export_vars.innodb_rows_deleted= srv_n_rows_deleted;
+		export_vars.innodb_trx_deadlocks= srv_trx_deadlock_counter;
         mutex_exit(&srv_innodb_monitor_mutex);
 
 }
--- mysql-5.0.75-clean/sql/ha_innodb.cc	2008-12-30 01:27:41.000000000 +0100
+++ mysql-5.0.75/sql/ha_innodb.cc	2008-12-30 02:20:33.000000000 +0100
@@ -324,6 +324,8 @@
   (char*) &export_vars.innodb_rows_read,                  SHOW_LONG},
   {"rows_updated",
   (char*) &export_vars.innodb_rows_updated,               SHOW_LONG},
+  {"trx_deadlocks",
+  (char*) &export_vars.innodb_trx_deadlocks,			  SHOW_LONG},
   {NullS, NullS, SHOW_LONG}};
 
 /* General functions */