# name       : innodb_buffer_pool_shm.patch
# introduced : 12
# maintainer : Yasufumi
#
#!!! notice !!!
# Any small change to this file in the main branch
# should be done or reviewed by the maintainer!
--- a/storage/innobase/buf/buf0buf.c
+++ b/storage/innobase/buf/buf0buf.c
@@ -1022,10 +1022,12 @@
 	buf_block_t*	block;
 	byte*		frame;
 	ulint		i;
+	ulint		size_target;
 
 	/* Round down to a multiple of page size,
 	although it already should be. */
 	mem_size = ut_2pow_round(mem_size, UNIV_PAGE_SIZE);
+	size_target = (mem_size / UNIV_PAGE_SIZE) - 1;
 	/* Reserve space for the block descriptors. */
 	mem_size += ut_2pow_round((mem_size / UNIV_PAGE_SIZE) * (sizeof *block)
 				  + (UNIV_PAGE_SIZE - 1), UNIV_PAGE_SIZE);
@@ -1063,6 +1065,10 @@
 		chunk->size = size;
 	}
 
+	if (chunk->size > size_target) {
+		chunk->size = size_target;
+	}
+
 	/* Init block structs and assign frames for them. Then we
 	assign the frames to the first blocks (we already mapped the
 	memory above). */
--- a/storage/innobase/handler/ha_innodb.cc
+++ b/storage/innobase/handler/ha_innodb.cc
@@ -195,6 +195,8 @@
 static my_bool	innobase_stats_on_metadata		= TRUE;
 static my_bool	innobase_large_prefix			= FALSE;
 static my_bool	innobase_use_sys_stats_table		= FALSE;
+static my_bool	innobase_buffer_pool_shm_checksum	= TRUE;
+static uint	innobase_buffer_pool_shm_key		= 0;
 
 
 static char*	internal_innobase_data_file_path	= NULL;
@@ -2706,6 +2708,12 @@
 	srv_buf_pool_size = (ulint) innobase_buffer_pool_size;
 	srv_buf_pool_instances = (ulint) innobase_buffer_pool_instances;
 
+	if (innobase_buffer_pool_shm_key) {
+		fprintf(stderr,
+			"InnoDB: Warning: innodb_buffer_pool_shm_key is deprecated function.\n"
+			"InnoDB:          innodb_buffer_pool_shm_key was ignored.\n");
+	}
+
 	srv_mem_pool_size = (ulint) innobase_additional_mem_pool_size;
 
 	srv_n_file_io_threads = (ulint) innobase_file_io_threads;
@@ -11863,6 +11871,16 @@
   "Number of buffer pool instances, set to higher value on high-end machines to increase scalability",
   NULL, NULL, 1L, 1L, MAX_BUFFER_POOLS, 1L);
 
+static MYSQL_SYSVAR_UINT(buffer_pool_shm_key, innobase_buffer_pool_shm_key,
+  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
+  "[Deprecated option] no effect",
+  NULL, NULL, 0, 0, INT_MAX32, 0);
+
+static MYSQL_SYSVAR_BOOL(buffer_pool_shm_checksum, innobase_buffer_pool_shm_checksum,
+  PLUGIN_VAR_NOCMDARG | PLUGIN_VAR_READONLY,
+  "[Deprecated option] no effect",
+  NULL, NULL, TRUE);
+
 static MYSQL_SYSVAR_ULONG(commit_concurrency, innobase_commit_concurrency,
   PLUGIN_VAR_RQCMDARG,
   "Helps in performance tuning in heavily concurrent environments.",
@@ -12209,6 +12227,8 @@
   MYSQL_SYSVAR(autoextend_increment),
   MYSQL_SYSVAR(buffer_pool_size),
   MYSQL_SYSVAR(buffer_pool_instances),
+  MYSQL_SYSVAR(buffer_pool_shm_key),
+  MYSQL_SYSVAR(buffer_pool_shm_checksum),
   MYSQL_SYSVAR(checksums),
   MYSQL_SYSVAR(fast_checksum),
   MYSQL_SYSVAR(commit_concurrency),
--- /dev/null
+++ b/mysql-test/r/percona_innodb_buffer_pool_shm.result
@@ -0,0 +1,4 @@
+show variables like 'innodb_buffer_pool_shm%';
+Variable_name	Value
+innodb_buffer_pool_shm_checksum	ON
+innodb_buffer_pool_shm_key	123456
--- /dev/null
+++ b/mysql-test/t/percona_innodb_buffer_pool_shm-master.opt
@@ -0,0 +1 @@
+--innodb_buffer_pool_shm_key=123456
--- /dev/null
+++ b/mysql-test/t/percona_innodb_buffer_pool_shm.test
@@ -0,0 +1,2 @@
+--source include/have_innodb.inc
+show variables like 'innodb_buffer_pool_shm%';