On Sun, 2011-09-04 at 09:53 +0800, Wu Fengguang wrote:
> @@ -591,6 +790,7 @@ static void global_update_bandwidth(unsi
>
> void __bdi_update_bandwidth(struct backing_dev_info *bdi,
> unsigned long thresh,
> + unsigned long bg_thresh,
> unsigned long dirty,
> unsigned long bdi_thresh,
> unsigned long bdi_dirty,
> @@ -627,6 +827,7 @@ snapshot:
>
> static void bdi_update_bandwidth(struct backing_dev_info *bdi,
> unsigned long thresh,
> + unsigned long bg_thresh,
> unsigned long dirty,
> unsigned long bdi_thresh,
> unsigned long bdi_dirty,
> @@ -635,8 +836,8 @@ static void bdi_update_bandwidth(struct
> if (time_is_after_eq_jiffies(bdi->bw_time_stamp + BANDWIDTH_INTERVAL))
> return;
> spin_lock(&bdi->wb.list_lock);
> - __bdi_update_bandwidth(bdi, thresh, dirty, bdi_thresh, bdi_dirty,
> - start_time);
> + __bdi_update_bandwidth(bdi, thresh, bg_thresh, dirty,
> + bdi_thresh, bdi_dirty, start_time);
> spin_unlock(&bdi->wb.list_lock);
> }
>
> @@ -677,7 +878,8 @@ static void balance_dirty_pages(struct a
> * catch-up. This avoids (excessively) small writeouts
> * when the bdi limits are ramping up.
> */
> - if (nr_dirty <= (background_thresh + dirty_thresh) / 2)
> + if (nr_dirty <= dirty_freerun_ceiling(dirty_thresh,
> + background_thresh))
> break;
>
> bdi_thresh = bdi_dirty_limit(bdi, dirty_thresh);
> @@ -721,8 +923,9 @@ static void balance_dirty_pages(struct a
> if (!bdi->dirty_exceeded)
> bdi->dirty_exceeded = 1;
>
> - bdi_update_bandwidth(bdi, dirty_thresh, nr_dirty,
> - bdi_thresh, bdi_dirty, start_time);
> + bdi_update_bandwidth(bdi, dirty_thresh, background_thresh,
> + nr_dirty, bdi_thresh, bdi_dirty,
> + start_time);
>
> /* Note: nr_reclaimable denotes nr_dirty + nr_unstable.
> * Unstable writes are a feature of certain networked
> --- linux-next.orig/fs/fs-writeback.c 2011-08-26 15:57:18.000000000 +0800
> +++ linux-next/fs/fs-writeback.c 2011-08-26 15:57:20.000000000 +0800
> @@ -675,7 +675,7 @@ static inline bool over_bground_thresh(v
> static void wb_update_bandwidth(struct bdi_writeback *wb,
> unsigned long start_time)
> {
> - __bdi_update_bandwidth(wb->bdi, 0, 0, 0, 0, start_time);
> + __bdi_update_bandwidth(wb->bdi, 0, 0, 0, 0, 0, start_time);
> }
>
> /*
> --- linux-next.orig/include/linux/writeback.h 2011-08-26 15:57:18.000000000 +0800
> +++ linux-next/include/linux/writeback.h 2011-08-26 15:57:20.000000000 +0800
> @@ -141,6 +141,7 @@ unsigned long bdi_dirty_limit(struct bac
>
> void __bdi_update_bandwidth(struct backing_dev_info *bdi,
> unsigned long thresh,
> + unsigned long bg_thresh,
> unsigned long dirty,
> unsigned long bdi_thresh,
> unsigned long bdi_dirty,
All this function signature muck doesn't seem immediately relevant to
the introduction of bdi_position_ratio() since the new function isn't
actually used.
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