From: Linus Torvalds Date: Tue, 15 Jan 2008 05:21:29 +0000 (-0800) Subject: Revert "writeback: introduce writeback_control.more_io to indicate more io" X-Git-Tag: v2.6.24-rc8~11 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=c23f72cae9523d29ff94eec8f30ccbdaf234b20e;p=linux-2.6-omap-h63xx.git Revert "writeback: introduce writeback_control.more_io to indicate more io" This reverts commit 2e6883bdf49abd0e7f0d9b6297fc3be7ebb2250b, as requested by Fengguang Wu. It's not quite fully baked yet, and while there are patches around to fix the problems it caused, they should get more testing. Says Fengguang: "I'll resend them both for -mm later on, in a more complete patchset". See http://bugzilla.kernel.org/show_bug.cgi?id=9738 for some of this discussion. Requested-by: Fengguang Wu Cc: Andrew Morton Cc: Peter Zijlstra Signed-off-by: Linus Torvalds --- diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c index 0fca82021d7..300324bd563 100644 --- a/fs/fs-writeback.c +++ b/fs/fs-writeback.c @@ -482,8 +482,6 @@ sync_sb_inodes(struct super_block *sb, struct writeback_control *wbc) if (wbc->nr_to_write <= 0) break; } - if (!list_empty(&sb->s_more_io)) - wbc->more_io = 1; return; /* Leave any unwritten inodes on s_io */ } diff --git a/include/linux/writeback.h b/include/linux/writeback.h index bef7d66601c..c6148bbf125 100644 --- a/include/linux/writeback.h +++ b/include/linux/writeback.h @@ -62,7 +62,6 @@ struct writeback_control { unsigned for_reclaim:1; /* Invoked from the page allocator */ unsigned for_writepages:1; /* This is a writepages() call */ unsigned range_cyclic:1; /* range_start is cyclic */ - unsigned more_io:1; /* more io to be dispatched */ }; /* diff --git a/mm/page-writeback.c b/mm/page-writeback.c index d55cfcae2ef..3d3848fa632 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -558,7 +558,6 @@ static void background_writeout(unsigned long _min_pages) global_page_state(NR_UNSTABLE_NFS) < background_thresh && min_pages <= 0) break; - wbc.more_io = 0; wbc.encountered_congestion = 0; wbc.nr_to_write = MAX_WRITEBACK_PAGES; wbc.pages_skipped = 0; @@ -566,9 +565,8 @@ static void background_writeout(unsigned long _min_pages) min_pages -= MAX_WRITEBACK_PAGES - wbc.nr_to_write; if (wbc.nr_to_write > 0 || wbc.pages_skipped > 0) { /* Wrote less than expected */ - if (wbc.encountered_congestion || wbc.more_io) - congestion_wait(WRITE, HZ/10); - else + congestion_wait(WRITE, HZ/10); + if (!wbc.encountered_congestion) break; } } @@ -633,12 +631,11 @@ static void wb_kupdate(unsigned long arg) global_page_state(NR_UNSTABLE_NFS) + (inodes_stat.nr_inodes - inodes_stat.nr_unused); while (nr_to_write > 0) { - wbc.more_io = 0; wbc.encountered_congestion = 0; wbc.nr_to_write = MAX_WRITEBACK_PAGES; writeback_inodes(&wbc); if (wbc.nr_to_write > 0) { - if (wbc.encountered_congestion || wbc.more_io) + if (wbc.encountered_congestion) congestion_wait(WRITE, HZ/10); else break; /* All the old data is written */