linux-kernel - Re: [PATCH 5/7] blk-iocost: Move the usage ratio calculation to the correct place

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Date:   Wed, 25 Nov 2020 21:36:11 +0800
From:   Baolin Wang <baolin.wang@...ux.alibaba.com>
To:     Tejun Heo <tj@...nel.org>
Cc:     axboe@...nel.dk, baolin.wang7@...il.com,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/7] blk-iocost: Move the usage ratio calculation to the
 correct place



在 2020/11/25 20:19, Tejun Heo 写道:
> Hello,
>> @@ -2225,6 +2207,25 @@ static void ioc_timer_fn(struct timer_list *timer)
>>   		     time_before64(vtime, now.vnow - ioc->margins.low))) {
>>   			u32 hwa, old_hwi, hwm, new_hwi;
>>   
>> +			if (vdone != vtime) {
>> +				u64 inflight_us = DIV64_U64_ROUND_UP(
>> +					cost_to_abs_cost(vtime - vdone, hw_inuse),
>> +					ioc->vtime_base_rate);
>> +
>> +				usage_us = max(usage_us, inflight_us);
>> +			}
>> +
>> +			/* convert to hweight based usage ratio */
>> +			if (time_after64(iocg->activated_at, ioc->period_at))
>> +				usage_dur = max_t(u64, now.now - iocg->activated_at, 1);
>> +			else
>> +				usage_dur = max_t(u64, now.now - ioc->period_at, 1);
>> +
>> +			usage = clamp_t(u32,
>> +				DIV64_U64_ROUND_UP(usage_us * WEIGHT_ONE,
>> +						   usage_dur),
>> +				1, WEIGHT_ONE);
> 
> Can you please move the variable declarations inside the block together with
> the code?

Yes, sure. Will do in next version. Thanks.