From 32c7f202a4801252a0f3578807b75a961f792870 Mon Sep 17 00:00:00 2001 From: Wu Fengguang Date: Mon, 8 Aug 2011 15:19:47 -0600 Subject: [PATCH] btrfs: fix dirtied pages accounting on sub-page writes When doing 1KB sequential writes to the same page, balance_dirty_pages_ratelimited_nr() should be called once instead of 4 times, the latter makes the dirtier tasks be throttled much too heavy. Fix it with proper de-accounting on clear_page_dirty_for_io(). CC: Chris Mason Signed-off-by: Wu Fengguang --- fs/btrfs/file.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index 97fbe939c050d..bfb620ead295d 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -1136,7 +1136,8 @@ static noinline int prepare_pages(struct btrfs_root *root, struct file *file, GFP_NOFS); } for (i = 0; i < num_pages; i++) { - clear_page_dirty_for_io(pages[i]); + if (clear_page_dirty_for_io(pages[i])) + account_page_redirty(pages[i]); set_page_extent_mapped(pages[i]); WARN_ON(!PageLocked(pages[i])); }