On Wed, 25 Jun 2014 08:58:48 +0100 Mel Gorman <mgorman@xxxxxxx> wrote:
> @@ -325,7 +321,14 @@ static unsigned long zone_dirty_limit(struct zone *zone)
> */
> bool zone_dirty_ok(struct zone *zone)
> {
> - unsigned long limit = zone_dirty_limit(zone);
> + unsigned long limit = zone->dirty_limit_cached;
> + struct task_struct *tsk = current;
> +
> + if (tsk->flags & PF_LESS_THROTTLE || rt_task(tsk)) {
> + limit = zone_dirty_limit(zone);
> + zone->dirty_limit_cached = limit;
> + limit += limit / 4;
> + }
Could we get a comment in here explaining what we're doing and why
PF_LESS_THROTTLE and rt_task control whether we do it?
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