When wbc.more_io was first introduced, it indicates whether there are at least one superblock whose s_more_io contains more IO work. Now with the per-bdi writeback, it can be replaced with a simple b_more_io test. Signed-off-by: Wu Fengguang --- fs/fs-writeback.c | 9 ++------- include/linux/writeback.h | 1 - include/trace/events/writeback.h | 5 +---- 3 files changed, 3 insertions(+), 12 deletions(-) --- linux-next.orig/fs/fs-writeback.c 2010-07-22 11:23:27.000000000 +0800 +++ linux-next/fs/fs-writeback.c 2010-07-22 12:56:42.000000000 +0800 @@ -507,12 +507,8 @@ static int writeback_sb_inodes(struct su iput(inode); cond_resched(); spin_lock(&inode_lock); - if (wbc->nr_to_write <= 0) { - wbc->more_io = 1; + if (wbc->nr_to_write <= 0) return 1; - } - if (!list_empty(&wb->b_more_io)) - wbc->more_io = 1; } /* b_io is empty */ return 1; @@ -622,7 +618,6 @@ static long wb_writeback(struct bdi_writ if (work->for_background && !over_bground_thresh()) break; - wbc.more_io = 0; wbc.nr_to_write = MAX_WRITEBACK_PAGES; wbc.pages_skipped = 0; @@ -644,7 +639,7 @@ static long wb_writeback(struct bdi_writ /* * Didn't write everything and we don't have more IO, bail */ - if (!wbc.more_io) + if (list_empty(&wb->b_more_io)) break; /* * Did we write something? Try for more --- linux-next.orig/include/linux/writeback.h 2010-07-22 11:23:27.000000000 +0800 +++ linux-next/include/linux/writeback.h 2010-07-22 11:24:46.000000000 +0800 @@ -49,7 +49,6 @@ struct writeback_control { unsigned for_background:1; /* A background writeback */ unsigned for_reclaim:1; /* Invoked from the page allocator */ unsigned range_cyclic:1; /* range_start is cyclic */ - unsigned more_io:1; /* more io to be dispatched */ }; /* --- linux-next.orig/include/trace/events/writeback.h 2010-07-22 11:23:27.000000000 +0800 +++ linux-next/include/trace/events/writeback.h 2010-07-22 11:24:46.000000000 +0800 @@ -99,7 +99,6 @@ DECLARE_EVENT_CLASS(wbc_class, __field(int, for_background) __field(int, for_reclaim) __field(int, range_cyclic) - __field(int, more_io) __field(long, range_start) __field(long, range_end) ), @@ -113,13 +112,12 @@ DECLARE_EVENT_CLASS(wbc_class, __entry->for_background = wbc->for_background; __entry->for_reclaim = wbc->for_reclaim; __entry->range_cyclic = wbc->range_cyclic; - __entry->more_io = wbc->more_io; __entry->range_start = (long)wbc->range_start; __entry->range_end = (long)wbc->range_end; ), TP_printk("bdi %s: towrt=%ld skip=%ld mode=%d kupd=%d " - "bgrd=%d reclm=%d cyclic=%d more=%d " + "bgrd=%d reclm=%d cyclic=%d " "start=0x%lx end=0x%lx", __entry->name, __entry->nr_to_write, @@ -129,7 +127,6 @@ DECLARE_EVENT_CLASS(wbc_class, __entry->for_background, __entry->for_reclaim, __entry->range_cyclic, - __entry->more_io, __entry->range_start, __entry->range_end) ) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/