On Mon, Nov 20, 2017 at 10:00:27AM +0800, Joseph Qi wrote:
> From: Joseph Qi <qijiang...@alibaba-inc.com>
>
> dm device set QUEUE_FLAG_NONROT in resume, which is after register
> queue. That is to mean, the previous initialization in
> blk_throtl_register_queue is wrong in this case.
> Fix it by checking and then updating the info during root tg
> initialization as we don't have a better choice.
>
> Signed-off-by: Joseph Qi <qijiang...@alibaba-inc.com>
> ---
> block/blk-throttle.c | 17 +++++++++++++++++
> 1 file changed, 17 insertions(+)
>
> diff --git a/block/blk-throttle.c b/block/blk-throttle.c
> index bf52035..6d6b220 100644
> --- a/block/blk-throttle.c
> +++ b/block/blk-throttle.c
> @@ -541,6 +541,23 @@ static void throtl_pd_init(struct blkg_policy_data *pd)
> if (cgroup_subsys_on_dfl(io_cgrp_subsys) && blkg->parent)
> sq->parent_sq = &blkg_to_tg(blkg->parent)->service_queue;
> tg->td = td;
> +
> + /*
> + * dm device set QUEUE_FLAG_NONROT in resume, which is after resister
> + * queue, so the previous initialization is wrong in this case. Check
> + * and update it here.
> + */
> + if (blk_queue_nonrot(blkg->q) &&
> + td->filtered_latency != LATENCY_FILTERED_SSD) {
> + int i;
> +
> + td->throtl_slice = DFL_THROTL_SLICE_SSD;
if CONFIG_BLK_DEV_THROTTLING_LOW isn't not set, we use old slice, can you do
the same thing here? Otherwise,
Reviewed-by: Shaohua Li <s...@kernel.org>
> + td->filtered_latency = LATENCY_FILTERED_SSD;
> + for (i = 0; i < LATENCY_BUCKET_SIZE; i++) {
> + td->avg_buckets[READ][i].latency = 0;
> + td->avg_buckets[WRITE][i].latency = 0;
> + }
> + }
> }
>
> /*
> --
> 1.9.4
