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

diff -ruN a/innobase/buf/buf0flu.c b/innobase/buf/buf0flu.c
--- a/innobase/buf/buf0flu.c	2008-12-19 02:19:35.000000000 +0900
+++ b/innobase/buf/buf0flu.c	2009-01-09 15:51:10.000000000 +0900
@@ -898,10 +898,17 @@
 
 				old_page_count = page_count;
 				
+				if (srv_flush_neighbor_pages) {
 				/* Try to flush also all the neighbors */
 				page_count +=
 					buf_flush_try_neighbors(space, offset,
 								flush_type);
+				} else {
+				/* Try to flush the page only */
+				page_count +=
+					buf_flush_try_page(space, offset,
+							   flush_type);
+				}
 				/* fprintf(stderr,
 				"Flush type %lu, page no %lu, neighb %lu\n",
 				flush_type, offset,
diff -ruN a/innobase/buf/buf0rea.c b/innobase/buf/buf0rea.c
--- a/innobase/buf/buf0rea.c	2009-01-09 15:40:22.000000000 +0900
+++ b/innobase/buf/buf0rea.c	2009-01-09 15:40:46.000000000 +0900
@@ -189,6 +189,10 @@
 	ulint		err;
 	ulint		i;
 
+	if (!(srv_read_ahead & 1)) {
+		return(0);
+	}
+
 	if (srv_startup_is_before_trx_rollback_phase) {
 	        /* No read-ahead to avoid thread deadlocks */
 	        return(0);
@@ -396,6 +400,10 @@
 	ulint		err;
 	ulint		i;
 	
+	if (!(srv_read_ahead & 2)) {
+		return(0);
+	}
+
 	if (srv_startup_is_before_trx_rollback_phase) {
 	        /* No read-ahead to avoid thread deadlocks */
 	        return(0);
diff -ruN a/innobase/ibuf/ibuf0ibuf.c b/innobase/ibuf/ibuf0ibuf.c
--- a/innobase/ibuf/ibuf0ibuf.c	2008-12-19 02:19:35.000000000 +0900
+++ b/innobase/ibuf/ibuf0ibuf.c	2009-01-09 15:53:18.000000000 +0900
@@ -370,8 +370,9 @@
 	grow in size, as the references on the upper levels of the tree can
 	change */
 	
-	ibuf->max_size = buf_pool_get_curr_size() / UNIV_PAGE_SIZE
-						/ IBUF_POOL_SIZE_PER_MAX_SIZE;
+	ibuf->max_size = ut_min( buf_pool_get_curr_size() / UNIV_PAGE_SIZE
+		/ IBUF_POOL_SIZE_PER_MAX_SIZE, (ulint) srv_ibuf_max_size / UNIV_PAGE_SIZE);
+	srv_ibuf_max_size = (long long) ibuf->max_size * UNIV_PAGE_SIZE;
 	ibuf->meter = IBUF_THRESHOLD + 1;
 
 	UT_LIST_INIT(ibuf->data_list);
@@ -2258,11 +2259,13 @@
 
 	mutex_enter(&ibuf_mutex);
 
+	if (!srv_ibuf_active_contract) {
 	if (ibuf->size < ibuf->max_size + IBUF_CONTRACT_ON_INSERT_NON_SYNC) {
 		mutex_exit(&ibuf_mutex);
 
 		return;
 	}
+	}
 
 	sync = FALSE;
 	
diff -ruN a/innobase/include/os0file.h b/innobase/include/os0file.h
--- a/innobase/include/os0file.h	2009-01-09 15:40:22.000000000 +0900
+++ b/innobase/include/os0file.h	2009-01-09 15:40:46.000000000 +0900
@@ -551,8 +551,10 @@
 /*========*/
 	ulint	n,		/* in: maximum number of pending aio operations
 				allowed; n must be divisible by n_segments */
-	ulint	n_segments,	/* in: combined number of segments in the four
-				first aio arrays; must be >= 4 */
+//	ulint	n_segments,	/* in: combined number of segments in the four
+//				first aio arrays; must be >= 4 */
+	ulint	n_read_threads,  /* n_segments == 2 + n_read_threads + n_write_threads */
+	ulint	n_write_threads, /**/
 	ulint	n_slots_sync);	/* in: number of slots in the sync aio array */
 /***********************************************************************
 Requests an asynchronous i/o operation. */
diff -ruN a/innobase/include/srv0srv.h b/innobase/include/srv0srv.h
--- a/innobase/include/srv0srv.h	2009-01-09 15:40:22.000000000 +0900
+++ b/innobase/include/srv0srv.h	2009-01-09 15:54:33.000000000 +0900
@@ -89,6 +89,8 @@
 extern ulint	srv_lock_table_size;
 
 extern ulint	srv_n_file_io_threads;
+extern ulint	srv_n_read_io_threads;
+extern ulint	srv_n_write_io_threads;
 
 #ifdef UNIV_LOG_ARCHIVE
 extern ibool	srv_log_archive_on;
@@ -133,6 +135,14 @@
 extern ulong	srv_max_purge_lag;
 extern ibool	srv_use_awe;
 extern ibool	srv_use_adaptive_hash_indexes;
+
+extern ulint	srv_io_capacity;
+extern long long	srv_ibuf_max_size;
+extern ulint	srv_ibuf_active_contract;
+extern ulint	srv_ibuf_accel_rate;
+extern ulint	srv_flush_neighbor_pages;
+extern uint	srv_read_ahead;
+extern ulint	srv_adaptive_checkpoint;
 /*-------------------------------------------*/
 
 extern ulint	srv_n_rows_inserted;
diff -ruN a/innobase/log/log0log.c b/innobase/log/log0log.c
--- a/innobase/log/log0log.c	2008-12-19 02:19:36.000000000 +0900
+++ b/innobase/log/log0log.c	2009-01-09 15:40:46.000000000 +0900
@@ -3326,6 +3326,15 @@
 			(ulong) ut_dulint_get_high(log_sys->last_checkpoint_lsn),
 			(ulong) ut_dulint_get_low(log_sys->last_checkpoint_lsn));
 
+	fprintf(file,
+		"Max checkpoint age  %lu\n"
+		"Modified age        %lu\n"
+		"Checkpoint age      %lu\n",
+			(ulong) log_sys->max_checkpoint_age,
+			(ulong) ut_dulint_minus(log_sys->lsn,
+					log_buf_pool_get_oldest_modification()),
+			(ulong) ut_dulint_minus(log_sys->lsn, log_sys->last_checkpoint_lsn));
+
 	current_time = time(NULL);
 			
 	time_elapsed = 0.001 + difftime(current_time,
diff -ruN a/innobase/os/os0file.c b/innobase/os/os0file.c
--- a/innobase/os/os0file.c	2009-01-09 15:40:23.000000000 +0900
+++ b/innobase/os/os0file.c	2009-01-09 15:40:46.000000000 +0900
@@ -2877,8 +2877,10 @@
 /*========*/
 	ulint	n,		/* in: maximum number of pending aio operations
 				allowed; n must be divisible by n_segments */
-	ulint	n_segments,	/* in: combined number of segments in the four
-				first aio arrays; must be >= 4 */
+//	ulint	n_segments,	/* in: combined number of segments in the four
+//				first aio arrays; must be >= 4 */
+	ulint	n_read_threads,  /* n_segments == 2 + n_read_threads + n_write_threads*/
+	ulint	n_write_threads, /**/
 	ulint	n_slots_sync)	/* in: number of slots in the sync aio array */
 {
 	ulint	n_read_segs;
@@ -2888,6 +2890,8 @@
 #ifdef POSIX_ASYNC_IO
 	sigset_t   sigset;
 #endif
+	ulint	n_segments = 2 + n_read_threads + n_write_threads;
+
 	ut_ad(n % n_segments == 0);
 	ut_ad(n_segments >= 4);
 
@@ -2898,8 +2902,8 @@
 	}
 
 	n_per_seg = n / n_segments;
-	n_write_segs = (n_segments - 2) / 2;
-	n_read_segs = n_segments - 2 - n_write_segs;
+	n_write_segs = n_write_threads;
+	n_read_segs = n_read_threads;
 	
 	/* fprintf(stderr, "Array n per seg %lu\n", n_per_seg); */
 
@@ -3180,6 +3184,13 @@
 	struct aiocb*	control;
 #endif
 	ulint		i;
+	ulint		prim_segment;
+	ulint		n;
+
+	n = array->n_slots / array->n_segments;
+	/* 64 blocks' striping ( aligning max(BUF_READ_AHEAD_AREA) ) */
+	prim_segment = ( offset >> (UNIV_PAGE_SIZE_SHIFT + 6) ) % (array->n_segments);
+
 loop:
 	os_mutex_enter(array->mutex);
 
@@ -3198,6 +3209,16 @@
 		goto loop;
 	}
 
+	for (i = prim_segment * n; i < array->n_slots; i++) {
+		slot = os_aio_array_get_nth_slot(array, i);
+
+		if (slot->reserved == FALSE) {
+			break;
+		}
+	}
+
+	if (slot->reserved == TRUE){
+		/* Not found after the intended segment. So we should search before. */
 	for (i = 0;; i++) {
 		slot = os_aio_array_get_nth_slot(array, i);
 
@@ -3205,6 +3226,7 @@
 			break;
 		}
 	}
+	}
 
 	array->n_reserved++;
 
diff -ruN a/innobase/srv/srv0srv.c b/innobase/srv/srv0srv.c
--- a/innobase/srv/srv0srv.c	2009-01-09 15:40:23.000000000 +0900
+++ b/innobase/srv/srv0srv.c	2009-01-09 15:58:36.000000000 +0900
@@ -167,6 +167,8 @@
 ulint	srv_lock_table_size	= ULINT_MAX;
 
 ulint	srv_n_file_io_threads	= ULINT_MAX;
+ulint	srv_n_read_io_threads	= 1;
+ulint	srv_n_write_io_threads	= 1;
 
 #ifdef UNIV_LOG_ARCHIVE
 ibool	srv_log_archive_on	= FALSE;
@@ -324,6 +326,22 @@
 ibool	srv_use_awe			= FALSE;
 ibool	srv_use_adaptive_hash_indexes 	= TRUE;
 
+ulint	srv_io_capacity = 100;
+
+/* Returns the number of IO operations that is X percent of the capacity.
+PCT_IO(5) -> returns the number of IO operations that is 5% of the max
+where max is srv_io_capacity. */
+#define PCT_IO(pct) ((ulint) (srv_io_capacity * ((double) pct / 100.0)))
+
+long long	srv_ibuf_max_size = 0;
+ulint	srv_ibuf_active_contract = 0; /* 0:disable 1:enable */
+ulint	srv_ibuf_accel_rate = 100;
+#define PCT_IBUF_IO(pct) ((ulint) (srv_io_capacity * srv_ibuf_accel_rate * ((double) pct / 10000.0)))
+
+ulint	srv_flush_neighbor_pages = 1; /* 0:disable 1:enable */
+
+uint	srv_read_ahead = 3; /* 1: random  2: linear  3: Both */
+ulint	srv_adaptive_checkpoint = 0; /* 0:disable 1:enable */
 /*-------------------------------------------*/
 ulong	srv_n_spin_wait_rounds	= 20;
 ulong	srv_n_free_tickets_to_enter = 500;
@@ -2214,6 +2232,8 @@
 	ibool		skip_sleep	= FALSE;
 	ulint		i;
 	
+	dulint		oldest_lsn;
+	
 #ifdef UNIV_DEBUG_THREAD_CREATION
 	fprintf(stderr, "Master thread starts, id %lu\n",
 			      os_thread_pf(os_thread_get_curr_id()));
@@ -2302,9 +2322,9 @@
 						+ log_sys->n_pending_writes;
 		n_ios = log_sys->n_log_ios + buf_pool->n_pages_read
 						+ buf_pool->n_pages_written;
-		if (n_pend_ios < 3 && (n_ios - n_ios_old < 5)) {
+		if (n_pend_ios < 3 && (n_ios - n_ios_old < PCT_IO(5))) {
 			srv_main_thread_op_info = "doing insert buffer merge";
-			ibuf_contract_for_n_pages(TRUE, 5);
+			ibuf_contract_for_n_pages(TRUE, PCT_IBUF_IO(5));
 
 			srv_main_thread_op_info = "flushing log";
 
@@ -2317,7 +2337,7 @@
 			/* Try to keep the number of modified pages in the
 			buffer pool under the limit wished by the user */
 			
-			n_pages_flushed = buf_flush_batch(BUF_FLUSH_LIST, 100,
+			n_pages_flushed = buf_flush_batch(BUF_FLUSH_LIST, PCT_IO(100),
 							  ut_dulint_max);
 
 		        /* If we had to do the flush, it may have taken
@@ -2326,6 +2346,49 @@
 			iteration of this loop. */
 			     
 			skip_sleep = TRUE;
+		} else if (srv_adaptive_checkpoint) {
+
+			/* Try to keep modified age not to exceed
+			max_checkpoint_age * 7/8 line */
+
+			mutex_enter(&(log_sys->mutex));
+
+			oldest_lsn = buf_pool_get_oldest_modification();
+			if (ut_dulint_is_zero(oldest_lsn)) {
+
+				mutex_exit(&(log_sys->mutex));
+
+			} else {
+				if (ut_dulint_minus(log_sys->lsn, oldest_lsn)
+				    > (log_sys->max_checkpoint_age) - ((log_sys->max_checkpoint_age) / 8)) {
+					/* LOG_POOL_PREFLUSH_RATIO_ASYNC is exceeded. */
+					/* We should not flush from here. */
+					mutex_exit(&(log_sys->mutex));
+				} else if (ut_dulint_minus(log_sys->lsn, oldest_lsn)
+				    > (log_sys->max_checkpoint_age) - ((log_sys->max_checkpoint_age) / 4)) {
+
+					/* 2nd defence line (max_checkpoint_age * 3/4) */
+
+					mutex_exit(&(log_sys->mutex));
+
+					n_pages_flushed = buf_flush_batch(BUF_FLUSH_LIST, PCT_IO(100),
+									  ut_dulint_max);
+					skip_sleep = TRUE;
+				} else if (ut_dulint_minus(log_sys->lsn, oldest_lsn)
+					   > (log_sys->max_checkpoint_age)/2 ) {
+
+					/* 1st defence line (max_checkpoint_age * 1/2) */
+
+					mutex_exit(&(log_sys->mutex));
+
+					n_pages_flushed = buf_flush_batch(BUF_FLUSH_LIST, PCT_IO(10),
+									  ut_dulint_max);
+					skip_sleep = TRUE;
+				} else {
+					mutex_exit(&(log_sys->mutex));
+				}
+			}
+
 		}
 
 		if (srv_activity_count == old_activity_count) {
@@ -2352,10 +2415,10 @@
 	n_pend_ios = buf_get_n_pending_ios() + log_sys->n_pending_writes;
 	n_ios = log_sys->n_log_ios + buf_pool->n_pages_read
 						+ buf_pool->n_pages_written;
-	if (n_pend_ios < 3 && (n_ios - n_ios_very_old < 200)) {
+	if (n_pend_ios < 3 && (n_ios - n_ios_very_old < PCT_IO(200))) {
 
 		srv_main_thread_op_info = "flushing buffer pool pages";
-		buf_flush_batch(BUF_FLUSH_LIST, 100, ut_dulint_max);
+		buf_flush_batch(BUF_FLUSH_LIST, PCT_IO(100), ut_dulint_max);
 
 		srv_main_thread_op_info = "flushing log";
 		log_buffer_flush_to_disk();
@@ -2365,7 +2428,7 @@
 	even if the server were active */
 
 	srv_main_thread_op_info = "doing insert buffer merge";
-	ibuf_contract_for_n_pages(TRUE, 5);
+	ibuf_contract_for_n_pages(TRUE, PCT_IBUF_IO(5));
 
 	srv_main_thread_op_info = "flushing log";
 	log_buffer_flush_to_disk();
@@ -2407,14 +2470,14 @@
 		(> 70 %), we assume we can afford reserving the disk(s) for
 		the time it requires to flush 100 pages */
 
-	        n_pages_flushed = buf_flush_batch(BUF_FLUSH_LIST, 100,
+	        n_pages_flushed = buf_flush_batch(BUF_FLUSH_LIST, PCT_IO(100),
 							ut_dulint_max);
 	} else {
 	        /* Otherwise, we only flush a small number of pages so that
 		we do not unnecessarily use much disk i/o capacity from
 		other work */
 
-	        n_pages_flushed = buf_flush_batch(BUF_FLUSH_LIST, 10,
+	        n_pages_flushed = buf_flush_batch(BUF_FLUSH_LIST, PCT_IO(10),
 							ut_dulint_max);
 	}
 
@@ -2503,7 +2566,7 @@
 	if (srv_fast_shutdown && srv_shutdown_state > 0) {
 	        n_bytes_merged = 0;
 	} else {
-	        n_bytes_merged = ibuf_contract_for_n_pages(TRUE, 20);
+	        n_bytes_merged = ibuf_contract_for_n_pages(TRUE, PCT_IBUF_IO(100));
 	}
 
 	srv_main_thread_op_info = "reserving kernel mutex";
@@ -2520,7 +2583,7 @@
 
 	if (srv_fast_shutdown < 2) {
 		n_pages_flushed =
-			buf_flush_batch(BUF_FLUSH_LIST, 100, ut_dulint_max);
+			buf_flush_batch(BUF_FLUSH_LIST, PCT_IO(100), ut_dulint_max);
 	} else {
 		/* In the fastest shutdown we do not flush the buffer pool
 		to data files: we set n_pages_flushed to 0 artificially. */
diff -ruN a/innobase/srv/srv0start.c b/innobase/srv/srv0start.c
--- a/innobase/srv/srv0start.c	2008-12-19 02:19:37.000000000 +0900
+++ b/innobase/srv/srv0start.c	2009-01-09 15:40:46.000000000 +0900
@@ -1205,24 +1205,28 @@
 		return(DB_ERROR);
 	}
 
+	/* over write innodb_file_io_threads */
+	srv_n_file_io_threads = 2 + srv_n_read_io_threads + srv_n_write_io_threads;
+
 	/* Restrict the maximum number of file i/o threads */
 	if (srv_n_file_io_threads > SRV_MAX_N_IO_THREADS) {
 
 		srv_n_file_io_threads = SRV_MAX_N_IO_THREADS;
+		srv_n_read_io_threads = srv_n_write_io_threads = (SRV_MAX_N_IO_THREADS - 2) / 2;
 	}
 
 	if (!os_aio_use_native_aio) {
  		/* In simulated aio we currently have use only for 4 threads */
-		srv_n_file_io_threads = 4;
+		/*srv_n_file_io_threads = 4;*/
 
 		os_aio_init(8 * SRV_N_PENDING_IOS_PER_THREAD
 						* srv_n_file_io_threads,
-					srv_n_file_io_threads,
-					SRV_MAX_N_PENDING_SYNC_IOS);
+					srv_n_read_io_threads, srv_n_write_io_threads,
+					SRV_MAX_N_PENDING_SYNC_IOS * 8);
 	} else {
 		os_aio_init(SRV_N_PENDING_IOS_PER_THREAD
 						* srv_n_file_io_threads,
-					srv_n_file_io_threads,
+					srv_n_read_io_threads, srv_n_write_io_threads,
 					SRV_MAX_N_PENDING_SYNC_IOS);
 	}
 	
diff -ruN a/patch_info/innodb_io_patches.info b/patch_info/innodb_io_patches.info
--- /dev/null	1970-01-01 09:00:00.000000000 +0900
+++ b/patch_info/innodb_io_patches.info	2009-01-09 15:59:05.000000000 +0900
@@ -0,0 +1,11 @@
+File=innodb_io_patches.patch
+Name=Cluster of past InnoDB IO patches
+Version=1.1
+Author=Percona
+License=GPL
+Comment=This patch contains fixed (control_flush_and_merge_and_read, control_io-threads, adaptive_flush)
+ChangeLog=
+2008-11-06
+YK: Initial release
+2009-01-09
+YK: Some parameters are added
diff -ruN a/sql/ha_innodb.cc b/sql/ha_innodb.cc
--- a/sql/ha_innodb.cc	2009-01-09 15:40:23.000000000 +0900
+++ b/sql/ha_innodb.cc	2009-01-09 15:40:46.000000000 +0900
@@ -149,6 +149,7 @@
      innobase_lock_wait_timeout, innobase_force_recovery,
      innobase_open_files;
 
+long innobase_read_io_threads, innobase_write_io_threads;
 longlong innobase_buffer_pool_size, innobase_log_file_size;
 
 /* The default values for the following char* start-up parameters
@@ -1403,6 +1404,8 @@
 	srv_mem_pool_size = (ulint) innobase_additional_mem_pool_size;
 
 	srv_n_file_io_threads = (ulint) innobase_file_io_threads;
+	srv_n_read_io_threads = (ulint) innobase_read_io_threads;
+	srv_n_write_io_threads = (ulint) innobase_write_io_threads;
 
 	srv_lock_wait_timeout = (ulint) innobase_lock_wait_timeout;
 	srv_force_recovery = (ulint) innobase_force_recovery;
diff -ruN a/sql/ha_innodb.h b/sql/ha_innodb.h
--- a/sql/ha_innodb.h	2009-01-09 15:40:23.000000000 +0900
+++ b/sql/ha_innodb.h	2009-01-09 15:59:41.000000000 +0900
@@ -204,6 +204,7 @@
 extern long innobase_additional_mem_pool_size;
 extern long innobase_buffer_pool_awe_mem_mb;
 extern long innobase_file_io_threads, innobase_lock_wait_timeout;
+extern long innobase_read_io_threads, innobase_write_io_threads;
 extern long innobase_force_recovery;
 extern long innobase_open_files;
 extern char *innobase_data_home_dir, *innobase_data_file_path;
@@ -234,6 +235,13 @@
 extern ulong srv_thread_concurrency;
 extern ulong srv_commit_concurrency;
 extern ulong srv_flush_log_at_trx_commit;
+extern ulong srv_io_capacity;
+extern long long srv_ibuf_max_size;
+extern ulong srv_ibuf_active_contract;
+extern ulong srv_ibuf_accel_rate;
+extern ulong srv_flush_neighbor_pages;
+extern uint srv_read_ahead;
+extern ulong srv_adaptive_checkpoint;
 }
 
 bool innobase_init(void);
diff -ruN a/sql/mysqld.cc b/sql/mysqld.cc
--- a/sql/mysqld.cc	2009-01-09 15:40:23.000000000 +0900
+++ b/sql/mysqld.cc	2009-01-09 16:01:25.000000000 +0900
@@ -5036,6 +5036,15 @@
   OPT_INNODB_ROLLBACK_ON_TIMEOUT,
   OPT_SECURE_FILE_PRIV,
   OPT_KEEP_FILES_ON_CREATE,
+  OPT_INNODB_IO_CAPACITY,
+  OPT_INNODB_IBUF_MAX_SIZE,
+  OPT_INNODB_IBUF_ACTIVE_CONTRACT,
+  OPT_INNODB_IBUF_ACCEL_RATE,
+  OPT_INNODB_FLUSH_NEIGHBOR_PAGES,
+  OPT_INNODB_READ_AHEAD,
+  OPT_INNODB_ADAPTIVE_CHECKPOINT,
+  OPT_INNODB_READ_IO_THREADS,
+  OPT_INNODB_WRITE_IO_THREADS,
   OPT_INNODB_ADAPTIVE_HASH_INDEX,
   OPT_FEDERATED
 };
@@ -5344,6 +5353,41 @@
    (gptr*) &global_system_variables.innodb_table_locks,
    (gptr*) &global_system_variables.innodb_table_locks,
    0, GET_BOOL, OPT_ARG, 1, 0, 0, 0, 0, 0},
+  {"innodb_io_capacity", OPT_INNODB_IO_CAPACITY,
+   "Number of IO operations per second the server can do. Tunes background IO rate.",
+   (gptr*) &srv_io_capacity, (gptr*) &srv_io_capacity,
+   0, GET_ULONG, REQUIRED_ARG, 100, 100, 999999999, 0, 0, 0},
+  {"innodb_ibuf_max_size", OPT_INNODB_IBUF_MAX_SIZE,
+   "The maximum size of the insert buffer. (in bytes)",
+   (gptr*) &srv_ibuf_max_size, (gptr*) &srv_ibuf_max_size, 0,
+   GET_LL, REQUIRED_ARG, LONGLONG_MAX, 0, LONGLONG_MAX, 0, 0, 0},
+  {"innodb_ibuf_active_contract", OPT_INNODB_IBUF_ACTIVE_CONTRACT,
+   "Enable/Disable active_contract of insert buffer. 0:disable 1:enable",
+   (gptr*) &srv_ibuf_active_contract, (gptr*) &srv_ibuf_active_contract,
+   0, GET_ULONG, REQUIRED_ARG, 0, 0, 1, 0, 0, 0},
+  {"innodb_ibuf_accel_rate", OPT_INNODB_IBUF_ACCEL_RATE,
+   "Tunes amount of insert buffer processing of background, in addition to innodb_io_capacity. (in percentage)",
+   (gptr*) &srv_ibuf_accel_rate, (gptr*) &srv_ibuf_accel_rate,
+   0, GET_ULONG, REQUIRED_ARG, 100, 100, 999999999, 0, 0, 0},
+  {"innodb_flush_neighbor_pages", OPT_INNODB_FLUSH_NEIGHBOR_PAGES,
+   "Enable/Disable flushing also neighbor pages. 0:disable 1:enable",
+   (gptr*) &srv_flush_neighbor_pages, (gptr*) &srv_flush_neighbor_pages,
+   0, GET_ULONG, REQUIRED_ARG, 1, 0, 1, 0, 0, 0},
+  {"innodb_read_ahead", OPT_INNODB_READ_AHEAD,
+   "Control read ahead activity. (none, random, linear, [both])",
+   0, 0, 0, GET_ULONG, REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
+  {"innodb_adaptive_checkpoint", OPT_INNODB_ADAPTIVE_CHECKPOINT,
+   "Enable/Diasable flushing along modified age. 0:disable 1:enable",
+   (gptr*) &srv_adaptive_checkpoint, (gptr*) &srv_adaptive_checkpoint,
+   0, GET_ULONG, REQUIRED_ARG, 0, 0, 1, 0, 0, 0},
+  {"innodb_read_io_threads", OPT_INNODB_READ_IO_THREADS,
+   "Number of background read I/O threads in InnoDB.",
+   (gptr*) &innobase_read_io_threads, (gptr*) &innobase_read_io_threads,
+   0, GET_LONG, REQUIRED_ARG, 1, 1, 64, 0, 0, 0},
+  {"innodb_write_io_threads", OPT_INNODB_WRITE_IO_THREADS,
+   "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},
 #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,
@@ -7637,6 +7636,22 @@
   case OPT_INNODB_LOG_ARCHIVE:
     innobase_log_archive= argument ? test(atoi(argument)) : 1;
     break;
+  case OPT_INNODB_READ_AHEAD:
+    if (argument == disabled_my_option)
+      srv_read_ahead = 0;
+    else if (! argument)
+      srv_read_ahead = 3;
+    else
+    {
+      int type;
+      if ((type=find_type(argument, &innodb_read_ahead_typelib, 2)) <= 0)
+      {
+        fprintf(stderr,"Unknown innodb_read_ahead type: %s\n",argument);
+        exit(1);
+      }
+      srv_read_ahead = (uint) ((type - 1) & 3);
+    }
+    break;
 #endif /* HAVE_INNOBASE_DB */
   case OPT_MYISAM_RECOVER:
   {
diff -ruN a/sql/set_var.cc b/sql/set_var.cc
--- a/sql/set_var.cc	2009-01-09 15:40:23.000000000 +0900
+++ b/sql/set_var.cc	2009-01-09 16:05:22.000000000 +0900
@@ -484,6 +484,37 @@
 sys_var_long_ptr  sys_innodb_flush_log_at_trx_commit(
                                         "innodb_flush_log_at_trx_commit",
                                         &srv_flush_log_at_trx_commit);
+sys_var_long_ptr	sys_innodb_io_capacity("innodb_io_capacity",
+                                               &srv_io_capacity);
+sys_var_long_ptr	sys_innodb_ibuf_active_contract("innodb_ibuf_active_contract",
+                                                        &srv_ibuf_active_contract);
+sys_var_long_ptr	sys_innodb_ibuf_accel_rate("innodb_ibuf_accel_rate",
+                                                   &srv_ibuf_accel_rate);
+sys_var_long_ptr	sys_innodb_flush_neighbor_pages("innodb_flush_neighbor_pages",
+                                                        &srv_flush_neighbor_pages);
+
+const char *innodb_read_ahead_names[]=
+{
+  "none", /* 0 */
+  "random",
+  "linear",
+  "both", /* 3 */
+  /* For compatibility of the older patch */
+  "0", /* 4 ("none" + 4) */
+  "1",
+  "2",
+  "3", /* 7 ("both" + 4) */
+  NullS
+};
+TYPELIB innodb_read_ahead_typelib=
+{
+  array_elements(innodb_read_ahead_names) - 1, "innodb_read_ahead_typelib",
+  innodb_read_ahead_names, NULL
+};
+sys_var_enum	sys_innodb_read_ahead("innodb_read_ahead", &srv_read_ahead,
+                                      &innodb_read_ahead_typelib, fix_innodb_read_ahead);
+sys_var_long_ptr	sys_innodb_adaptive_checkpoint("innodb_adaptive_checkpoint",
+                                                      &srv_adaptive_checkpoint);
 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", 
@@ -847,6 +859,12 @@
   &sys_innodb_thread_concurrency,
   &sys_innodb_commit_concurrency,
   &sys_innodb_flush_log_at_trx_commit,
+  &sys_innodb_io_capacity,
+  &sys_innodb_ibuf_active_contract,
+  &sys_innodb_ibuf_accel_rate,
+  &sys_innodb_flush_neighbor_pages,
+  &sys_innodb_read_ahead,
+  &sys_innodb_adaptive_checkpoint,
 #endif
   &sys_trust_routine_creators,
   &sys_trust_function_creators,
@@ -982,6 +1000,15 @@
   {sys_innodb_table_locks.name, (char*) &sys_innodb_table_locks, SHOW_SYS},
   {sys_innodb_thread_concurrency.name, (char*) &sys_innodb_thread_concurrency, SHOW_SYS},
   {sys_innodb_thread_sleep_delay.name, (char*) &sys_innodb_thread_sleep_delay, SHOW_SYS},
+  {sys_innodb_io_capacity.name, (char*) &sys_innodb_io_capacity, SHOW_SYS},
+  {"innodb_ibuf_max_size", (char*) &srv_ibuf_max_size, SHOW_LONGLONG},
+  {sys_innodb_ibuf_active_contract.name, (char*) &sys_innodb_ibuf_active_contract, SHOW_SYS},
+  {sys_innodb_ibuf_accel_rate.name, (char*) &sys_innodb_ibuf_accel_rate, SHOW_SYS},
+  {sys_innodb_flush_neighbor_pages.name, (char*) &sys_innodb_flush_neighbor_pages, SHOW_SYS},
+  {sys_innodb_read_ahead.name, (char*) &sys_innodb_read_ahead, SHOW_SYS},
+  {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},
 #endif
   {sys_interactive_timeout.name,(char*) &sys_interactive_timeout,   SHOW_SYS},
   {sys_join_buffer_size.name,   (char*) &sys_join_buffer_size,	    SHOW_SYS},
@@ -1482,6 +1501,13 @@
   }
 }

+#ifdef HAVE_INNOBASE_DB
+extern void fix_innodb_read_ahead(THD *thd, enum_var_type type)
+{
+  srv_read_ahead &= 3;
+}
+#endif /* HAVE_INNOBASE_DB */
+
 static void fix_max_binlog_size(THD *thd, enum_var_type type)
 {
   DBUG_ENTER("fix_max_binlog_size");
diff -ruN a/sql/set_var.h b/sql/set_var.h
--- a/sql/set_var.h	2009-01-12 11:20:31.000000000 +0900
+++ b/sql/set_var.h	2009-01-12 15:26:35.000000000 +0900
@@ -31,6 +31,10 @@

 extern TYPELIB bool_typelib, delay_key_write_typelib, sql_mode_typelib;

+#ifdef HAVE_INNOBASE_DB
+extern TYPELIB innodb_read_ahead_typelib;
+#endif /* HAVE_INNOBASE_DB */
+
 typedef int (*sys_check_func)(THD *,  set_var *);
 typedef bool (*sys_update_func)(THD *, set_var *);
 typedef void (*sys_after_update_func)(THD *,enum_var_type);
@@ -1114,6 +1118,9 @@
 int sql_set_variables(THD *thd, List<set_var_base> *var_list);
 bool not_all_support_one_shot(List<set_var_base> *var_list);
 void fix_delay_key_write(THD *thd, enum_var_type type);
+#ifdef HAVE_INNOBASE_DB
+void fix_innodb_read_ahead(THD *thd, enum_var_type type);
+#endif /* HAVE_INNOBASE_DB */
 ulong fix_sql_mode(ulong sql_mode);
 extern sys_var_const_str sys_charset_system;
 extern sys_var_str sys_init_connect;