# name       : innodb_deadlock_count.patch
# introduced : 11 or before
# maintainer : Yasufumi
#
#!!! notice !!!
# Any small change to this file in the main branch
# should be done or reviewed by the maintainer!
--- a/storage/innobase/handler/ha_innodb.cc
+++ b/storage/innobase/handler/ha_innodb.cc
@@ -687,6 +687,8 @@
   (char*) &export_vars.innodb_dblwr_pages_written,	  SHOW_LONG},
   {"dblwr_writes",
   (char*) &export_vars.innodb_dblwr_writes,		  SHOW_LONG},
+  {"deadlocks",
+  (char*) &export_vars.innodb_deadlocks,		  SHOW_LONG},
   {"dict_tables",
   (char*) &export_vars.innodb_dict_tables,		  SHOW_LONG},
   {"have_atomic_builtins",
--- a/storage/innobase/include/lock0lock.h
+++ b/storage/innobase/include/lock0lock.h
@@ -43,6 +43,7 @@
 #endif /* UNIV_DEBUG */
 /* Buffer for storing information about the most recent deadlock error */
 extern FILE*	lock_latest_err_file;
+extern ulint	srv_n_lock_deadlock_count;
 
 /*********************************************************************//**
 Gets the size of a lock struct.
--- a/storage/innobase/include/srv0srv.h
+++ b/storage/innobase/include/srv0srv.h
@@ -758,6 +758,7 @@
 	ulint innodb_buffer_pool_read_ahead_evicted;/*!< srv_read_ahead evicted*/
 	ulint innodb_dblwr_pages_written;	/*!< srv_dblwr_pages_written */
 	ulint innodb_dblwr_writes;		/*!< srv_dblwr_writes */
+	ulint innodb_deadlocks;
 	ibool innodb_have_atomic_builtins;	/*!< HAVE_ATOMIC_BUILTINS */
 	ulint innodb_log_waits;			/*!< srv_log_waits */
 	ulint innodb_log_write_requests;	/*!< srv_log_write_requests */
--- a/storage/innobase/lock/lock0lock.c
+++ b/storage/innobase/lock/lock0lock.c
@@ -3330,6 +3330,7 @@
 		break;
 
 	case LOCK_VICTIM_IS_START:
+		srv_n_lock_deadlock_count++;
 		fputs("*** WE ROLL BACK TRANSACTION (2)\n",
 		      lock_latest_err_file);
 		break;
--- a/storage/innobase/srv/srv0srv.c
+++ b/storage/innobase/srv/srv0srv.c
@@ -468,6 +468,7 @@
 static ulint	srv_n_rows_deleted_old		= 0;
 static ulint	srv_n_rows_read_old		= 0;
 
+UNIV_INTERN ulint		srv_n_lock_deadlock_count	= 0;
 UNIV_INTERN ulint		srv_n_lock_wait_count		= 0;
 UNIV_INTERN ulint		srv_n_lock_wait_current_count	= 0;
 UNIV_INTERN ib_int64_t	srv_n_lock_wait_time		= 0;
@@ -2282,6 +2283,7 @@
 	export_vars.innodb_buffer_pool_pages_data = LRU_len;
 	export_vars.innodb_buffer_pool_pages_dirty = flush_list_len;
 	export_vars.innodb_buffer_pool_pages_free = free_len;
+	export_vars.innodb_deadlocks = srv_n_lock_deadlock_count;
 #ifdef UNIV_DEBUG
 	export_vars.innodb_buffer_pool_pages_latched
 		= buf_get_latched_pages_number();