Re: [PATCH 14/18] writeback: control dirty pause time

[Peter Zijlstra]

On Wed, 2011-09-07 at 10:02 +0800, Wu Fengguang wrote:
> > also, do the two other line segments connect on the transition
> > point?
> 
> I guess we can simply unify the other two formulas into one:
> 
>         } else if (period <= max_pause / 4 &&
>                  pages_dirtied >= current->nr_dirtied_pause) {
>                 current->nr_dirtied_pause = clamp_val(
> ==>                                     dirty_ratelimit * (max_pause / 2) / HZ,
>                                         pages_dirtied + pages_dirtied / 8,
>                                         pages_dirtied * 4);
>         } else if (pause >= max_pause) {
>                 current->nr_dirtied_pause = 1 | clamp_val(
> ==>                                     dirty_ratelimit * (max_pause / 2) / HZ,
>                                         pages_dirtied / 4,
>                                         pages_dirtied - pages_dirtied / 8);
>         } 


There's still the clamping, that combined with the various conditionals
make it very hard to tell if the functions are connected or jump around.
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