RE: [PATCH v4 7/9] scsi: ufshpb: Add "Cold" regions timer

[Daejun Park]

Hi Avri,

> +static void ufshpb_read_to_handler(struct work_struct *work)
> +{
> +        struct delayed_work *dwork = to_delayed_work(work);
> +        struct ufshpb_lu *hpb;
> +        struct victim_select_info *lru_info;
> +        struct ufshpb_region *rgn;
> +        unsigned long flags;
> +        LIST_HEAD(expired_list);
> +
> +        hpb = container_of(dwork, struct ufshpb_lu, ufshpb_read_to_work);
> +
> +        if (test_and_set_bit(TIMEOUT_WORK_PENDING, &hpb->work_data_bits))
> +                return;
> +
> +        spin_lock_irqsave(&hpb->rgn_state_lock, flags);
> +
> +        lru_info = &hpb->lru_info;
> +
> +        list_for_each_entry(rgn, &lru_info->lh_lru_rgn, list_lru_rgn) {
> +                bool timedout = ktime_after(ktime_get(), rgn->read_timeout);
> +
> +                if (timedout) {

It is important not just to check the timeout, but how much time has passed.
If the time exceeded is twice the threshold, the read_timeout_expiries
value should be reduced by 2 instead of 1.

> +                        rgn->read_timeout_expiries--;

Thanks,
Daejun