Hi Chris,
This btrfs patch depends on the account_page_redirty() introduced
earlier in this series.
Shall I carry it together with this patchset?
Thanks,
Fengguang
On Mon, Nov 28, 2011 at 09:53:43PM +0800, Wu, Fengguang wrote:
> 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 <chris.mason@xxxxxxxxxx>
> Signed-off-by: Wu Fengguang <fengguang.wu@xxxxxxxxx>
> ---
> fs/btrfs/file.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> --- linux-next.orig/fs/btrfs/file.c 2011-11-17 20:13:47.000000000 +0800
> +++ linux-next/fs/btrfs/file.c 2011-11-17 20:18:51.000000000 +0800
> @@ -1136,7 +1136,8 @@ again:
> 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]));
> }
>
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