On Tue, Jan 31, 2012 at 06:34:16PM +0800, Wu Fengguang wrote: > } > > + blk_start_plug(&plug); > written = mapping->a_ops->direct_IO(WRITE, iocb, iov, pos, *nr_segs); > + blk_finish_plug(&plug); Please move the plugging into ->direct_IO for both read and write, as that is the boundary between generic highlevel code, and low-level block code that should know about plugs. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>