On Wed, 2011-09-07 at 10:02 +0800, Wu Fengguang wrote:

quoted

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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