path: root/percona/5.0.77-b13/innodb_io_pattern.patch

diff -r 5060df9888d7 include/mysql_com.h
--- a/include/mysql_com.h	Tue Feb 17 22:33:54 2009 -0800
+++ b/include/mysql_com.h	Tue Feb 17 22:33:58 2009 -0800
@@ -121,6 +121,9 @@
 #define REFRESH_QUERY_CACHE_FREE 0x20000L /* pack query cache */
 #define REFRESH_DES_KEY_FILE	0x40000L
 #define REFRESH_USER_RESOURCES	0x80000L
+
+/* TRUNCATE INFORMATION_SCHEMA.INNODB_IO_PATTERN */
+#define REFRESH_INNODB_IO_PATTERN	0x1000000L
 
 #define CLIENT_LONG_PASSWORD	1	/* new more secure passwords */
 #define CLIENT_FOUND_ROWS	2	/* Found instead of affected rows */
diff -r 5060df9888d7 innobase/buf/buf0buf.c
--- a/innobase/buf/buf0buf.c	Tue Feb 17 22:33:54 2009 -0800
+++ b/innobase/buf/buf0buf.c	Tue Feb 17 22:33:58 2009 -0800
@@ -653,6 +653,9 @@
 	}
 
 	buf_pool->page_hash = hash_create(2 * max_size);
+	buf_pool->io_counter_hash = NULL;
+	buf_pool->io_counter_heap = NULL;
+	buf_pool->io_counters = 0;
 
 	buf_pool->n_pend_reads = 0;
 
@@ -1966,6 +1969,9 @@
 	ulint		io_type;
 	ulint		read_page_no;
 	
+	buf_io_counter_t*	io_counter;
+	ulint		fold;
+	
 	ut_ad(block);
 
 	ut_a(block->state == BUF_BLOCK_FILE_PAGE);
@@ -2067,6 +2073,26 @@
 		buf_pool->n_pages_read++;
 
 		rw_lock_x_unlock_gen(&(block->lock), BUF_IO_READ);
+		/* io_counter here */
+		if (srv_io_pattern && srv_io_pattern_trace_running) {
+		fold = buf_page_address_fold(block->space, block->offset);
+		HASH_SEARCH(hash, buf_pool->io_counter_hash, fold, io_counter,
+			(io_counter->space == block->space) && (io_counter->offset == block->offset));
+		if (io_counter == NULL && buf_pool->io_counters < srv_io_pattern_size_limit) {
+			io_counter = mem_heap_alloc(buf_pool->io_counter_heap,(sizeof(buf_io_counter_t)));
+			io_counter->space = block->space;
+			io_counter->offset = block->offset;
+			io_counter->n_read = 0;
+			io_counter->n_write = 0;
+			HASH_INSERT(buf_io_counter_t, hash, buf_pool->io_counter_hash,
+				buf_page_address_fold(block->space, block->offset), io_counter);
+			buf_pool->io_counters++;
+		}
+		if (io_counter != NULL) {
+			io_counter->index_id = ut_dulint_get_low(btr_page_get_index_id(buf_block_get_frame(block)));
+			io_counter->n_read++;
+		}
+		}
 
 #ifdef UNIV_DEBUG
 		if (buf_debug_prints) {
@@ -2082,6 +2108,26 @@
 		buf_flush_write_complete(block);
 
 		rw_lock_s_unlock_gen(&(block->lock), BUF_IO_WRITE);
+		/* io_counter here */
+		if (srv_io_pattern && srv_io_pattern_trace_running) {
+		fold = buf_page_address_fold(block->space, block->offset);
+		HASH_SEARCH(hash, buf_pool->io_counter_hash, fold, io_counter,
+			(io_counter->space == block->space) && (io_counter->offset == block->offset));
+		if (io_counter == NULL && buf_pool->io_counters < srv_io_pattern_size_limit) {
+			io_counter = mem_heap_alloc(buf_pool->io_counter_heap,(sizeof(buf_io_counter_t)));
+			io_counter->space = block->space;
+			io_counter->offset = block->offset;
+			io_counter->n_read = 0;
+			io_counter->n_write = 0;
+			HASH_INSERT(buf_io_counter_t, hash, buf_pool->io_counter_hash,
+				buf_page_address_fold(block->space, block->offset), io_counter);
+			buf_pool->io_counters++;
+		}
+		if (io_counter != NULL) {
+			io_counter->index_id = ut_dulint_get_low(btr_page_get_index_id(buf_block_get_frame(block)));
+			io_counter->n_write++;
+		}
+		}
 
 		buf_pool->n_pages_written++;
 
@@ -2656,3 +2702,58 @@
 return buf_pool_get_nth_block(buf_pool, i);
 
 }
+
+/*************************************************************************
+Controls the internal hash table for IO pattern tracing
+along innodb_io_pattern_trace value.*/
+
+void
+buf_io_counter_control(void)
+/*========================*/
+{
+       ulint   n;
+
+       mutex_enter(&(buf_pool->mutex));
+       if (srv_io_pattern_trace) {
+               if (buf_pool->io_counter_hash == NULL) {
+                       /* estimating (buf_pool * 10) */
+                       buf_pool->io_counter_hash = hash_create(20 * buf_pool->max_size);
+                       buf_pool->io_counter_heap = mem_heap_create(4096 * 1024);
+                       buf_pool->io_counters = 0;
+
+                       srv_io_pattern = TRUE;
+               }
+       } else {
+               if (buf_pool->io_counter_hash != NULL) {
+                       srv_io_pattern = FALSE;
+
+                       for (n = 0; n < buf_pool->io_counter_hash->n_cells; n++) {
+                               (buf_pool->io_counter_hash->array + n)->node = NULL;
+                       }
+                       mem_heap_free(buf_pool->io_counter_heap);
+                       buf_pool->io_counter_heap = NULL;
+                       buf_pool->io_counters = 0;
+
+                       hash_table_free(buf_pool->io_counter_hash);
+                       buf_pool->io_counter_hash = NULL;
+               }
+       }
+       mutex_exit(&(buf_pool->mutex));
+}
+
+void
+buf_io_counter_clear(void)
+/*======================*/
+{
+       ulint   n;
+
+       mutex_enter(&(buf_pool->mutex));
+       if (buf_pool->io_counter_hash != NULL) {
+               for (n = 0; n < buf_pool->io_counter_hash->n_cells; n++) {
+                       (buf_pool->io_counter_hash->array + n)->node = NULL;
+               }
+               mem_heap_empty(buf_pool->io_counter_heap);
+               buf_pool->io_counters = 0;
+       }
+       mutex_exit(&(buf_pool->mutex));
+}
diff -r 5060df9888d7 innobase/include/buf0buf.h
--- a/innobase/include/buf0buf.h	Tue Feb 17 22:33:54 2009 -0800
+++ b/innobase/include/buf0buf.h	Tue Feb 17 22:33:58 2009 -0800
@@ -709,6 +709,18 @@
 void buf_pool_dump(void);
 buf_block_t* buf_pool_get_nth_block_no_inline(buf_pool_t* pool, ulint i);  
 
+
+/*************************************************************************
+Controls the internal hash table for IO pattern tracing
+along innodb_io_pattern_trace value.*/
+
+void
+buf_io_counter_control(void);
+/*=========================*/
+
+void
+buf_io_counter_clear(void);
+/*=======================*/
 			
 /* The buffer control block structure */
 
@@ -930,6 +942,9 @@
 	ulint		curr_size;	/* current pool size in pages;
 					currently always the same as
 					max_size */
+	hash_table_t*	io_counter_hash;
+	mem_heap_t*	io_counter_heap;
+	ulint		io_counters;
 	hash_table_t*	page_hash;	/* hash table of the file pages */
 
 	ulint		n_pend_reads;	/* number of pending read operations */
@@ -1015,6 +1030,15 @@
 					locki table, are not in this list */
 };
 
+struct buf_io_counter_struct{
+	ulint	space;
+	ulint	offset;
+	buf_io_counter_t*	hash;
+	ulint	index_id;
+	ulint	n_read;
+	ulint	n_write;
+};
+
 /* States of a control block */
 #define	BUF_BLOCK_NOT_USED	211	/* is in the free list */
 #define BUF_BLOCK_READY_FOR_USE	212	/* when buf_get_free_block returns
diff -r 5060df9888d7 innobase/include/buf0types.h
--- a/innobase/include/buf0types.h	Tue Feb 17 22:33:54 2009 -0800
+++ b/innobase/include/buf0types.h	Tue Feb 17 22:33:58 2009 -0800
@@ -12,6 +12,8 @@
 typedef	struct buf_block_struct		buf_block_t;
 typedef	struct buf_pool_struct		buf_pool_t;
 
+typedef	struct buf_io_counter_struct	buf_io_counter_t;
+
 /* The 'type' used of a buffer frame */
 typedef	byte	buf_frame_t;
 
diff -r 5060df9888d7 innobase/include/srv0srv.h
--- a/innobase/include/srv0srv.h	Tue Feb 17 22:33:54 2009 -0800
+++ b/innobase/include/srv0srv.h	Tue Feb 17 22:33:58 2009 -0800
@@ -145,6 +145,11 @@
 extern ulint	srv_flush_neighbor_pages;
 extern uint	srv_read_ahead;
 extern ulint	srv_adaptive_checkpoint;
+
+extern volatile ibool srv_io_pattern;
+extern ulong	srv_io_pattern_trace;
+extern ulong	srv_io_pattern_trace_running;
+extern ulong	srv_io_pattern_size_limit;
 /*-------------------------------------------*/
 
 extern ulint	srv_n_rows_inserted;
diff -r 5060df9888d7 innobase/srv/srv0srv.c
--- a/innobase/srv/srv0srv.c	Tue Feb 17 22:33:54 2009 -0800
+++ b/innobase/srv/srv0srv.c	Tue Feb 17 22:33:58 2009 -0800
@@ -344,6 +344,11 @@
 
 uint	srv_read_ahead = 3; /* 1: random  2: linear  3: Both */
 ulint	srv_adaptive_checkpoint = 0; /* 0:disable 1:enable */
+
+volatile ibool srv_io_pattern = FALSE;
+ulint   srv_io_pattern_trace = 0;
+ulint   srv_io_pattern_trace_running = 0;
+ulint   srv_io_pattern_size_limit = ULINT_MAX - (1024 * 1024);
 /*-------------------------------------------*/
 ulong	srv_n_spin_wait_rounds	= 20;
 ulong	srv_n_free_tickets_to_enter = 500;
diff -r 5060df9888d7 mysql-test/r/information_schema.result
--- a/mysql-test/r/information_schema.result	Tue Feb 17 22:33:54 2009 -0800
+++ b/mysql-test/r/information_schema.result	Tue Feb 17 22:33:58 2009 -0800
@@ -59,6 +59,7 @@
 USER_PRIVILEGES
 USER_STATISTICS
 VIEWS
+INNODB_IO_PATTERN
 columns_priv
 db
 func
@@ -742,7 +743,7 @@
 CREATE VIEW a1 (t_CRASHME) AS SELECT f1 FROM t_crashme GROUP BY f1;
 CREATE VIEW a2 AS SELECT t_CRASHME FROM a1;
 count(*)
-108
+109
 drop view a2, a1;
 drop table t_crashme;
 select table_schema,table_name, column_name from
@@ -812,12 +813,13 @@
 TABLE_PRIVILEGES	TABLE_NAME	select
 TABLE_STATISTICS	TABLE_NAME	select
 VIEWS	TABLE_NAME	select
+INNODB_IO_PATTERN	TABLE_NAME	select
 delete from mysql.user where user='mysqltest_4';
 delete from mysql.db where user='mysqltest_4';
 flush privileges;
 SELECT table_schema, count(*) FROM information_schema.TABLES GROUP BY TABLE_SCHEMA;
 table_schema	count(*)
-information_schema	23
+information_schema	24
 mysql	17
 create table t1 (i int, j int);
 create trigger trg1 before insert on t1 for each row
@@ -1225,6 +1227,7 @@
 USER_PRIVILEGES	GRANTEE
 USER_STATISTICS	USER
 VIEWS	TABLE_SCHEMA
+INNODB_IO_PATTERN	SPACE
 SELECT t.table_name, c1.column_name
 FROM information_schema.tables t
 INNER JOIN
@@ -1263,6 +1266,7 @@
 USER_PRIVILEGES	GRANTEE
 USER_STATISTICS	USER
 VIEWS	TABLE_SCHEMA
+INNODB_IO_PATTERN	SPACE
 SELECT MAX(table_name) FROM information_schema.tables;
 MAX(table_name)
 VIEWS
@@ -1337,6 +1341,7 @@
 COLUMN_PRIVILEGES	information_schema.COLUMN_PRIVILEGES	1
 INDEX_STATISTICS	information_schema.INDEX_STATISTICS	1
 INNODB_BUFFER_POOL_CONTENT	information_schema.INNODB_BUFFER_POOL_CONTENT	1
+INNODB_IO_PATTERN	information_schema.INNODB_IO_PATTERN	1
 KEY_COLUMN_USAGE	information_schema.KEY_COLUMN_USAGE	1
 PROCESSLIST	information_schema.PROCESSLIST	1
 PROFILING	information_schema.PROFILING	1
diff -r 5060df9888d7 mysql-test/r/information_schema_db.result
--- a/mysql-test/r/information_schema_db.result	Tue Feb 17 22:33:54 2009 -0800
+++ b/mysql-test/r/information_schema_db.result	Tue Feb 17 22:33:58 2009 -0800
@@ -28,6 +28,7 @@
 USER_PRIVILEGES
 USER_STATISTICS
 VIEWS
+INNODB_IO_PATTERN
 show tables from INFORMATION_SCHEMA like 'T%';
 Tables_in_information_schema (T%)
 TABLES
diff -r 5060df9888d7 mysql-test/r/mysqlshow.result
--- a/mysql-test/r/mysqlshow.result	Tue Feb 17 22:33:54 2009 -0800
+++ b/mysql-test/r/mysqlshow.result	Tue Feb 17 22:33:58 2009 -0800
@@ -102,6 +102,7 @@
 | USER_PRIVILEGES                       |
 | USER_STATISTICS                       |
 | VIEWS                                 |
+| INNODB_IO_PATTERN                     |
 +---------------------------------------+
 Database: INFORMATION_SCHEMA
 +---------------------------------------+
@@ -130,6 +131,7 @@
 | USER_PRIVILEGES                       |
 | USER_STATISTICS                       |
 | VIEWS                                 |
+| INNODB_IO_PATTERN                     |
 +---------------------------------------+
 Wildcard: inf_rmation_schema
 +--------------------+
diff -r 5060df9888d7 patch_info/innodb_io_pattern.info
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/patch_info/innodb_io_pattern.info	Tue Feb 17 22:33:58 2009 -0800
@@ -0,0 +1,8 @@
+File=innodb_io_pattern.patch
+Name=Information schema table of InnoDB IO counts for each datafile pages
+Version=1.0
+Author=Percona <info@percona.com>
+License=GPL
+Comment=INFORMATION_SCHEMA.INNODB_IO_PATTERN
+2008-12-01
+YK: fix for mysql-test
diff -r 5060df9888d7 sql/ha_innodb.cc
--- a/sql/ha_innodb.cc	Tue Feb 17 22:33:54 2009 -0800
+++ b/sql/ha_innodb.cc	Tue Feb 17 22:33:58 2009 -0800
@@ -1569,6 +1569,8 @@
         pthread_cond_init(&commit_cond, NULL);
 	innodb_inited= 1;
 
+	buf_io_counter_control();
+
 	/* If this is a replication slave and we needed to do a crash recovery,
 	set the master binlog position to what InnoDB internally knew about
 	how far we got transactions durable inside InnoDB. There is a
@@ -6535,6 +6537,28 @@
 }
 
 /****************************************************************************
+Controls the internal hash table for IO pattern tracing
+along innodb_io_pattern_trace value.*/
+
+void
+innodb_io_pattern_control(void)
+/*===========================*/
+{
+	if (innodb_inited) {
+		buf_io_counter_control();
+	}
+}
+
+void
+innodb_io_pattern_clear(void)
+/*=========================*/
+{
+	if (innodb_inited) {
+		buf_io_counter_clear();
+	}
+}
+
+/****************************************************************************
 Implements the SHOW INNODB STATUS command. Sends the output of the InnoDB
 Monitor to the client. */
 
diff -r 5060df9888d7 sql/ha_innodb.h
--- a/sql/ha_innodb.h	Tue Feb 17 22:33:54 2009 -0800
+++ b/sql/ha_innodb.h	Tue Feb 17 22:33:58 2009 -0800
@@ -244,6 +244,9 @@
 extern ulong srv_adaptive_checkpoint;
 extern ulong srv_show_locks_held;
 extern ulong srv_show_verbose_locks;
+extern ulong srv_io_pattern_trace;
+extern ulong srv_io_pattern_trace_running;
+extern ulong srv_io_pattern_size_limit;
 }
 
 bool innobase_init(void);
@@ -270,6 +273,9 @@
 bool innodb_I_S_buffer_pool_content(THD* thd, TABLE_LIST *tables);
 bool innodb_mutex_show_status(THD* thd);
 void innodb_export_status(void);
+
+void innodb_io_pattern_control(void);
+void innodb_io_pattern_clear(void);
 
 void innobase_release_temporary_latches(THD *thd);
 
diff -r 5060df9888d7 sql/lex.h
--- a/sql/lex.h	Tue Feb 17 22:33:54 2009 -0800
+++ b/sql/lex.h	Tue Feb 17 22:33:58 2009 -0800
@@ -244,6 +244,7 @@
   { "INNER",		SYM(INNER_SYM)},
   { "INNOBASE",		SYM(INNOBASE_SYM)},
   { "INNODB",		SYM(INNOBASE_SYM)},
+  { "INNODB_IO_PATTERN", SYM(INNODB_IO_PATTERN)},
   { "INOUT",            SYM(INOUT_SYM)},
   { "INSENSITIVE",      SYM(INSENSITIVE_SYM)},
   { "INSERT",		SYM(INSERT)},
diff -r 5060df9888d7 sql/mysqld.cc
--- a/sql/mysqld.cc	Tue Feb 17 22:33:54 2009 -0800
+++ b/sql/mysqld.cc	Tue Feb 17 22:33:58 2009 -0800
@@ -5026,6 +5026,9 @@
   OPT_INNODB_SYNC_SPIN_LOOPS,
   OPT_INNODB_CONCURRENCY_TICKETS,
   OPT_INNODB_THREAD_SLEEP_DELAY,
+  OPT_INNODB_IO_PATTERN_TRACE,
+  OPT_INNODB_IO_PATTERN_TRACE_RUNNING,
+  OPT_INNODB_IO_PATTERN_SIZE_LIMIT,
   OPT_BDB_CACHE_SIZE,
   OPT_BDB_LOG_BUFFER_SIZE,
   OPT_BDB_MAX_LOCK,
@@ -5445,6 +5448,18 @@
    "Number of background write I/O threads in InnoDB.",
    (gptr*) &innobase_write_io_threads, (gptr*) &innobase_write_io_threads,
    0, GET_LONG, REQUIRED_ARG, 1, 1, 64, 0, 0, 0},
+  {"innodb_io_pattern_trace", OPT_INNODB_IO_PATTERN_TRACE,
+   "Create/Drop the internal hash table for IO pattern tracing.",
+   (gptr*) &srv_io_pattern_trace, (gptr*) &srv_io_pattern_trace,
+   0, GET_ULONG, REQUIRED_ARG, 0, 0, 1, 0, 0, 0},
+  {"innodb_io_pattern_trace_running", OPT_INNODB_IO_PATTERN_TRACE_RUNNING,
+   "Control IO pattern trace running or not.",
+   (gptr*) &srv_io_pattern_trace_running, (gptr*) &srv_io_pattern_trace_running,
+   0, GET_ULONG, REQUIRED_ARG, 0, 0, 1, 0, 0, 0},
+  {"innodb_io_pattern_size_limit", OPT_INNODB_IO_PATTERN_SIZE_LIMIT,
+   "Set max number of counters per data pages. (0 = disable counting).",
+   (gptr*) &srv_io_pattern_size_limit, (gptr*) &srv_io_pattern_size_limit,
+   0, GET_ULONG, REQUIRED_ARG, 0, 0, ULONG_MAX - (1024 * 1024), 0, 0, 0},
 #endif /* End HAVE_INNOBASE_DB */
   {"isam", OPT_ISAM, "Obsolete. ISAM storage engine is no longer supported.",
    (gptr*) &opt_isam, (gptr*) &opt_isam, 0, GET_BOOL, NO_ARG, 0, 0, 0,
diff -r 5060df9888d7 sql/set_var.cc
--- a/sql/set_var.cc	Tue Feb 17 22:33:54 2009 -0800
+++ b/sql/set_var.cc	Tue Feb 17 22:33:58 2009 -0800
@@ -528,6 +528,12 @@
 sys_var_long_ptr  sys_innodb_show_verbose_locks(
                                         "innodb_show_verbose_locks",
                                         &srv_show_verbose_locks);
+sys_var_innodb_io_pattern_trace sys_innodb_io_pattern_trace("innodb_io_pattern_trace",
+                                                            &srv_io_pattern_trace);
+sys_var_long_ptr        sys_innodb_io_pattern_trace_running("innodb_io_pattern_trace_running",
+                                                            &srv_io_pattern_trace_running);
+sys_var_long_ptr        sys_innodb_io_pattern_size_limit("innodb_io_pattern_size_limit",
+                                                         &srv_io_pattern_size_limit);
 sys_var_const_os_str_ptr sys_innodb_data_file_path("innodb_data_file_path", 
                                                &innobase_data_file_path);
 sys_var_const_os_str_ptr sys_innodb_data_home_dir("innodb_data_home_dir", 
@@ -901,6 +907,9 @@
   &sys_innodb_adaptive_checkpoint,
   &sys_innodb_show_locks_held,
   &sys_innodb_show_verbose_locks,
+  &sys_innodb_io_pattern_trace,
+  &sys_innodb_io_pattern_trace_running,
+  &sys_innodb_io_pattern_size_limit,
 #endif
   &sys_trust_routine_creators,
   &sys_trust_function_creators,
@@ -1047,6 +1056,9 @@
   {sys_innodb_adaptive_checkpoint.name, (char*) &sys_innodb_adaptive_checkpoint, SHOW_SYS},
   {"innodb_read_io_threads", (char*) &innobase_read_io_threads, SHOW_LONG},
   {"innodb_write_io_threads", (char*) &innobase_write_io_threads, SHOW_LONG},
+  {sys_innodb_io_pattern_trace.name, (char*) &sys_innodb_io_pattern_trace, SHOW_SYS},
+  {sys_innodb_io_pattern_trace_running.name, (char*) &sys_innodb_io_pattern_trace_running, SHOW_SYS},
+  {sys_innodb_io_pattern_size_limit.name, (char*) &sys_innodb_io_pattern_size_limit, SHOW_SYS},
 #endif
   {sys_interactive_timeout.name,(char*) &sys_interactive_timeout,   SHOW_SYS},
   {sys_join_buffer_size.name,   (char*) &sys_join_buffer_size,	    SHOW_SYS},
@@ -3160,6 +3172,19 @@
     thd->variables.lc_time_names= global_system_variables.lc_time_names;
 }
 
+#ifdef HAVE_INNOBASE_DB
+bool sys_var_innodb_io_pattern_trace::update(THD *thd, set_var *var)
+{
+  bool ret;
+
+  ret = sys_var_long_ptr_global::update(thd, var);
+
+  innodb_io_pattern_control();
+
+  return ret;
+}
+#endif /* HAVE_INNOBASE_DB */
+
 /*
   Functions to update thd->options bits
 */
diff -r 5060df9888d7 sql/set_var.h
--- a/sql/set_var.h	Tue Feb 17 22:33:54 2009 -0800
+++ b/sql/set_var.h	Tue Feb 17 22:33:58 2009 -0800
@@ -989,6 +989,17 @@
   virtual void set_default(THD *thd, enum_var_type type);
 };
 
+#ifdef HAVE_INNOBASE_DB
+/* sys_var_innodb_io_pattern_trace */
+class sys_var_innodb_io_pattern_trace :public sys_var_long_ptr
+{
+public:
+  sys_var_innodb_io_pattern_trace(const char *name_arg, ulong *value_ptr_arg)
+    :sys_var_long_ptr(name_arg,value_ptr_arg) {}
+  bool update(THD *thd, set_var *var);
+};
+#endif /* HAVE_INNOBASE_DB */
+
 /****************************************************************************
   Classes for parsing of the SET command
 ****************************************************************************/
diff -r 5060df9888d7 sql/sql_parse.cc
--- a/sql/sql_parse.cc	Tue Feb 17 22:33:54 2009 -0800
+++ b/sql/sql_parse.cc	Tue Feb 17 22:33:58 2009 -0800
@@ -8009,6 +8009,13 @@
     }
     pthread_mutex_unlock(&LOCK_global_user_client_stats);
   }
+#ifdef HAVE_INNOBASE_DB
+ if (options & REFRESH_INNODB_IO_PATTERN)
+ {
+   tmp_write_to_binlog= 0;
+   innodb_io_pattern_clear();
+ }
+#endif /* HAVE_INNOBASE_DB */
  *write_to_binlog= tmp_write_to_binlog;
  return result;
 }
diff -r 5060df9888d7 sql/sql_show.cc
--- a/sql/sql_show.cc	Tue Feb 17 22:33:54 2009 -0800
+++ b/sql/sql_show.cc	Tue Feb 17 22:33:58 2009 -0800
@@ -32,6 +32,17 @@
 #ifdef HAVE_INNOBASE_DB
 #include "ha_innodb.h"
 #endif
+
+#ifdef HAVE_INNOBASE_DB
+#define INSIDE_HA_INNOBASE_CC
+extern "C" {
+#include "srv0srv.h"
+#include "buf0buf.h"
+#include "dict0dict.h"
+}
+/* We need to undef it in InnoDB */
+#undef byte
+#endif /* HAVE_INNOBASE_DB */
 
 #ifndef NO_EMBEDDED_ACCESS_CHECKS
 static const char *grant_names[]={
@@ -4088,6 +4099,67 @@
   DBUG_RETURN(res);
 }
 
+int innodb_io_pattern_fill_table(THD *thd, TABLE_LIST *tables, COND *cond)
+{
+  TABLE *table= (TABLE *) tables->table;
+
+  buf_io_counter_t* io_counter;
+  dict_index_t* index;
+
+  DBUG_ENTER("innodb_io_pattern_fill_table");
+  int returnable= 0;
+
+  /* We cannot use inline functions of InnoDB here */
+
+  /* !!!!!ATTENTION!!!!!: This function is not protected by mutex for performance.     */
+  /* Don't use "DROP TABLE innodb_io_pattern" and INFORMATION_SCHEMA.INNODB_IO_PATTERN */
+  /* at the same time as possible.                                                     */
+
+  if (srv_io_pattern) {
+  for (ulint n=0; n < buf_pool->io_counter_hash->n_cells; n++) {
+    if (!srv_io_pattern)
+      goto end_func;
+
+    io_counter = (buf_io_counter_t*)(buf_pool->io_counter_hash->array + n)->node;
+    while (io_counter) {
+      if (!srv_io_pattern)
+        goto end_func;
+
+      if (dict_sys != NULL) {
+        dulint id;
+        id.high = 0;
+        id.low = io_counter->index_id;
+        index = dict_index_find_on_id_low(id);
+      } else {
+        index = NULL;
+      }
+
+      table->field[0]->store(io_counter->space);
+      table->field[1]->store(io_counter->offset);
+      table->field[2]->store(io_counter->index_id);
+      if (index != NULL) {
+        table->field[3]->store(index->table_name,strlen(index->table_name),system_charset_info);
+        table->field[4]->store(index->name,strlen(index->name),system_charset_info);
+      } else {
+        table->field[3]->store("",0,system_charset_info);
+        table->field[4]->store("",0,system_charset_info);
+      }
+      table->field[5]->store(io_counter->n_read);
+      table->field[6]->store(io_counter->n_write);
+      if (schema_table_store_record(thd, table))
+      {
+        returnable= 1;
+        goto end_func;
+      }
+      io_counter = io_counter->hash;
+    }
+  }
+  }
+
+ end_func:
+  DBUG_RETURN(returnable);
+}
+
 /*
   Find schema_tables elment by name
 
@@ -4894,6 +4966,19 @@
   {0, 0, MYSQL_TYPE_STRING, 0, 0, 0}
 };
 
+#ifdef HAVE_INNOBASE_DB
+ST_FIELD_INFO innodb_io_pattern_field_info[]=
+{
+  {"SPACE", 11, MYSQL_TYPE_LONG, 0, 0, "space_id"},
+  {"OFFSET", 11, MYSQL_TYPE_LONG, 0, 0, "offset"},
+  {"INDEX_ID", 11, MYSQL_TYPE_LONG, 0, 0, "index id"},
+  {"TABLE_NAME", 32, MYSQL_TYPE_STRING, 0, 0, "table name"},
+  {"INDEX_NAME", 32, MYSQL_TYPE_STRING, 0, 0, "index name"},
+  {"N_READ", 11, MYSQL_TYPE_LONG, 0, 0, "read ios"},
+  {"N_WRITE", 11, MYSQL_TYPE_LONG, 0, 0, "write ios"},
+  {0, 0, MYSQL_TYPE_STRING, 0, 0, 0}
+};
+#endif
 
 ST_FIELD_INFO variables_fields_info[]=
 {
@@ -5069,6 +5154,10 @@
    make_old_format, 0, -1, -1, 1},
   {"VIEWS", view_fields_info, create_schema_table, 
     get_all_tables, 0, get_schema_views_record, 1, 2, 0},
+#ifdef HAVE_INNOBASE_DB
+  {"INNODB_IO_PATTERN", innodb_io_pattern_field_info, create_schema_table,
+    innodb_io_pattern_fill_table, 0, 0, -1, -1, 0},
+#endif
   {0, 0, 0, 0, 0, 0, 0, 0, 0}
 };
 
diff -r 5060df9888d7 sql/sql_yacc.yy
--- a/sql/sql_yacc.yy	Tue Feb 17 22:33:54 2009 -0800
+++ b/sql/sql_yacc.yy	Tue Feb 17 22:33:58 2009 -0800
@@ -685,6 +685,7 @@
 %token  INFILE
 %token  INNER_SYM
 %token  INNOBASE_SYM
+%token  INNODB_IO_PATTERN
 %token  INOUT_SYM
 %token  INSENSITIVE_SYM
 %token  INSERT
@@ -8541,6 +8542,7 @@
         | MASTER_SYM    { Lex->type|= REFRESH_MASTER; }
 	| DES_KEY_FILE	{ Lex->type|= REFRESH_DES_KEY_FILE; }
  	| RESOURCES     { Lex->type|= REFRESH_USER_RESOURCES; }
+ 	| INNODB_IO_PATTERN { Lex->type|= REFRESH_INNODB_IO_PATTERN; }
  	| CLIENT_STATS_SYM { Lex->type|= REFRESH_CLIENT_STATS; }
  	| USER_STATS_SYM { Lex->type|= REFRESH_USER_STATS; }
  	| TABLE_STATS_SYM { Lex->type|= REFRESH_TABLE_STATS; }
@@ -9594,6 +9596,7 @@
 	| ISOLATION		{}
 	| ISSUER_SYM		{}
 	| INNOBASE_SYM		{}
+	| INNODB_IO_PATTERN	{}
 	| INSERT_METHOD		{}
 	| IO_SYM                {}
 	| IPC_SYM               {}