Merge mysql-5.1 to mysql-5.5.

mysql-test/suite/sys_vars/r/innodb_buffer_pool_evict_basic.result

+SELECT @@global.innodb_buffer_pool_evict;
+@@global.innodb_buffer_pool_evict
+
+SET GLOBAL innodb_buffer_pool_evict = 'uncompressed';
+SELECT @@global.innodb_buffer_pool_evict;
+@@global.innodb_buffer_pool_evict
+

mysql-test/suite/sys_vars/t/innodb_buffer_pool_evict_basic.test

+-- source include/have_innodb.inc
+# This is a debug variable for now
+-- source include/have_debug.inc
+
+SELECT @@global.innodb_buffer_pool_evict;
+
+SET GLOBAL innodb_buffer_pool_evict = 'uncompressed';
+
+# Should always be empty.
+SELECT @@global.innodb_buffer_pool_evict;

storage/innobase/buf/buf0buf.c

 /*****************************************************************************
 
-Copyright (c) 1995, 2012, Oracle and/or its affiliates. All Rights Reserved.
+Copyright (c) 1995, 2013, Oracle and/or its affiliates. All Rights Reserved.
 Copyright (c) 2008, Google Inc.
 
 Portions of this file contain modifications contributed and copyrighted by
@@ -2359,6 +2359,7 @@ got_block:
 		/* The page is being read to buffer pool,
 		but we cannot wait around for the read to
 		complete. */
+null_exit:
 		buf_pool_mutex_exit(buf_pool);
 
 		return(NULL);
@@ -2373,6 +2374,14 @@ got_block:
 
 	case BUF_BLOCK_ZIP_PAGE:
 	case BUF_BLOCK_ZIP_DIRTY:
+		if (mode == BUF_PEEK_IF_IN_POOL) {
+			/* This mode is only used for dropping an
+			adaptive hash index.  There cannot be an
+			adaptive hash index for a compressed-only
+			page, so do not bother decompressing the page. */
+			goto null_exit;
+		}
+
 		bpage = &block->page;
 		/* Protect bpage->buf_fix_count. */
 		mutex_enter(&buf_pool->zip_mutex);

storage/innobase/handler/ha_innodb.cc

 /*****************************************************************************
 
-Copyright (c) 2000, 2012, Oracle and/or its affiliates. All Rights Reserved.
+Copyright (c) 2000, 2013, Oracle and/or its affiliates. All Rights Reserved.
 Copyright (c) 2008, 2009 Google Inc.
 Copyright (c) 2009, Percona Inc.
 
@@ -11201,6 +11201,61 @@ innodb_change_buffering_update(
 		 *static_cast<const char*const*>(save);
 }
 
+#ifndef DBUG_OFF
+static char* srv_buffer_pool_evict;
+
+/****************************************************************//**
+Called on SET GLOBAL innodb_buffer_pool_evict=...
+Handles some values specially, to evict pages from the buffer pool.
+SET GLOBAL innodb_buffer_pool_evict='uncompressed'
+evicts all uncompressed page frames of compressed tablespaces. */
+static
+void
+innodb_buffer_pool_evict_update(
+/*============================*/
+	THD*			thd,	/*!< in: thread handle */
+	struct st_mysql_sys_var*var,	/*!< in: pointer to system variable */
+	void*			var_ptr,/*!< out: ignored */
+	const void*		save)	/*!< in: immediate result
+					from check function */
+{
+	if (const char* op = *static_cast<const char*const*>(save)) {
+		if (!strcmp(op, "uncompressed")) {
+			/* Evict all uncompressed pages of compressed
+			tables from the buffer pool. Keep the compressed
+			pages in the buffer pool. */
+
+			for (ulint i = 0; i < srv_buf_pool_instances; i++) {
+				buf_pool_t*	buf_pool = &buf_pool_ptr[i];
+
+				buf_pool_mutex_enter(buf_pool);
+
+				for (buf_block_t* block = UT_LIST_GET_LAST(
+					     buf_pool->unzip_LRU);
+				     block != NULL; ) {
+
+					buf_block_t*	prev_block
+						= UT_LIST_GET_PREV(unzip_LRU,
+								   block);
+					ut_ad(buf_block_get_state(block)
+					      == BUF_BLOCK_FILE_PAGE);
+					ut_ad(block->in_unzip_LRU_list);
+					ut_ad(block->page.in_LRU_list);
+
+					mutex_enter(&block->mutex);
+					buf_LRU_free_block(&block->page,
+							   FALSE);
+					mutex_exit(&block->mutex);
+					block = prev_block;
+				}
+
+				buf_pool_mutex_exit(buf_pool);
+			}
+		}
+	}
+}
+#endif /* !DBUG_OFF */
+
 static int show_innodb_vars(THD *thd, SHOW_VAR *var, char *buff)
 {
   innodb_export_status();
@@ -11442,6 +11497,13 @@ static MYSQL_SYSVAR_ULONG(autoextend_increment, srv_auto_extend_increment,
   "Data file autoextend increment in megabytes",
   NULL, NULL, 8L, 1L, 1000L, 0);
 
+#ifndef DBUG_OFF
+static MYSQL_SYSVAR_STR(buffer_pool_evict, srv_buffer_pool_evict,
+  PLUGIN_VAR_RQCMDARG,
+  "Evict pages from the InnoDB buffer pool.",
+  NULL, innodb_buffer_pool_evict_update, "");
+#endif /* !DBUG_OFF */
+
 static MYSQL_SYSVAR_LONGLONG(buffer_pool_size, innobase_buffer_pool_size,
   PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
   "The size of the memory buffer InnoDB uses to cache data and indexes of its tables.",
@@ -11629,6 +11691,9 @@ static MYSQL_SYSVAR_BOOL(print_all_deadlocks, srv_print_all_deadlocks,
 static struct st_mysql_sys_var* innobase_system_variables[]= {
   MYSQL_SYSVAR(additional_mem_pool_size),
   MYSQL_SYSVAR(autoextend_increment),
+#ifndef DBUG_OFF
+  MYSQL_SYSVAR(buffer_pool_evict),
+#endif /* !DBUG_OFF */
   MYSQL_SYSVAR(buffer_pool_size),
   MYSQL_SYSVAR(buffer_pool_instances),
   MYSQL_SYSVAR(checksums),