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

[Wu Fengguang]

> --- 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
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