Re: [PATCH 4/5] writeback: per task dirty rate limit

Wu Fengguang
2011-08-08T23:32:59Z

> --- linux-next.orig/kernel/fork.c 2011-08-08 22:11:59.000000000 +0800
> +++ linux-next/kernel/fork.c 2011-08-08 22:18:05.000000000 +0800
> @@ -1301,6 +1301,9 @@ static struct task_struct *copy_process(
> p->pdeath_signal = 0;
> p->exit_state = 0;
>
> + p->nr_dirtied = 0;
> + p->nr_dirtied_pause = 8;

Hmm, it looks better to allow a new task to dirty 128KB without being
throttled, if the system is not in dirty exceeded state. So changed
the last line to this:

+ p->nr_dirtied_pause = 128 >> (PAGE_SHIFT - 10);

Thanks,
Fengguang