Re: [PATCH 2/5] writeback: dirty position control

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On Sat, 2011-08-06 at 16:44 +0800, Wu Fengguang wrote:
> +static unsigned long bdi_position_ratio(struct backing_dev_info *bdi,
> +                                       unsigned long thresh,
> +                                       unsigned long dirty,
> +                                       unsigned long bdi_thresh,
> +                                       unsigned long bdi_dirty)
> +{
> +       unsigned long limit = hard_dirty_limit(thresh);
> +       unsigned long origin;
> +       unsigned long goal;
> +       unsigned long long span;
> +       unsigned long long pos_ratio;   /* for scaling up/down the rate limit */
> +
> +       if (unlikely(dirty >= limit))
> +               return 0;
> +
> +       /*
> +        * global setpoint
> +        */
> +       goal = thresh - thresh / DIRTY_SCOPE;
> +       origin = 4 * thresh;
> +
> +       if (unlikely(origin < limit && dirty > (goal + origin) / 2)) {
> +               origin = limit;                 /* auxiliary control line */
> +               goal = (goal + origin) / 2;
> +               pos_ratio >>= 1; 

use before init?
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