linux-kernel - Re: [PATCHSET v2 block/for-5.8] iocost: improve use

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Message-ID: <6f69d35c-c593-f140-c351-c7fd2c13069e@gmail.com>
Date:   Mon, 13 Apr 2020 20:00:29 +0300
From:   Pavel Begunkov <asml.silence@...il.com>
To:     Tejun Heo <tj@...nel.org>, axboe@...nel.dk
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-team@...com, cgroups@...r.kernel.org, newella@...com,
        josef@...icpanda.com, ming.lei@...hat.com, bvanassche@....org
Subject: Re: [PATCHSET v2 block/for-5.8] iocost: improve use_delay and latency
 target handling

On 13/04/2020 19:56, Pavel Begunkov wrote:
> On 13/04/2020 19:27, Tejun Heo wrote:
>> Changes from v1[1]
>>
>> * Dropped 0002-block-add-request-io_data_len.patch and updated to use
>>   rq->stats_sectors instead as suggested by Pavel Begunkov.
> 
> rq->stats_sectors is set only when there is QUEUE_FLAG_STATS, see
> blk_mq_start_request(). I don't see blk-iocost requiring it. Did I miss something?

And there is no reason to not initialise it unconditionally.

-- 
Pavel Begunkov



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