On Fri, Jan 15, 2016 at 06:17:25PM +0300, Andrey Ryabinin wrote:
> +void balance_dirty_pages_ratelimited_nr(struct address_space *mapping,
> + unsigned long nr_pages_dirtied)
> +{
> + unsigned long ratelimit;
> + int *p;
> +
> + ratelimit = ratelimit_pages;
> + if (mapping->backing_dev_info->dirty_exceeded ||
> + test_bit(UB_DIRTY_EXCEEDED, &get_io_ub()->ub_flags))
> + ratelimit = 8;
> +
> + /*
> + * Check the rate limiting. Also, we do not want to throttle real-time
> + * tasks in balance_dirty_pages(). Period.
> + */
> + preempt_disable();
> + p = &__get_cpu_var(bdp_ratelimits);
> + *p += nr_pages_dirtied;
> + if (unlikely(*p >= ratelimit)) {
> + ratelimit = sync_writeback_pages(*p);
> + *p = 0;
> + preempt_enable();
> + balance_dirty_pages_ub(mapping, ratelimit);
> + return;
> + }
> + preempt_enable();
> +}
I don't think it makes sense copying ratelimiting code from RH6. I guess
it wouldn't hurt if we just called balance_dirty_pages_ub every time we
call global balance_dirty_pages.
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