linux-kernel - Re: [PATCH 2/2] ufs: don't use the fair tag sharings

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Date:   Thu, 18 May 2023 15:55:35 +0800
From:   Yu Kuai <yukuai1@...weicloud.com>
To:     Bart Van Assche <bvanassche@....org>,
        Yu Kuai <yukuai1@...weicloud.com>,
        Christoph Hellwig <hch@...radead.org>
Cc:     Ed Tsai <ed.tsai@...iatek.com>, axboe@...nel.dk,
        linux-block@...r.kernel.org, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org, martin.petersen@...cle.com,
        stanley.chu@...iatek.com, peter.wang@...iatek.com,
        chun-hung.wu@...iatek.com, alice.chao@...iatek.com,
        powen.kao@...iatek.com, naomi.chu@...iatek.com,
        wsd_upstream@...iatek.com, "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH 2/2] ufs: don't use the fair tag sharings

Hi,

在 2023/05/18 10:23, Bart Van Assche 写道:
> On 5/17/23 18:49, Yu Kuai wrote:
>> Currently, fair share from hctx_may_queue() requires two
>> atomic_read(active_queues and active_requests), I think this smoothing
>> method can be placed into get_tag fail path, for example, the more times
>> a disk failed to get tag in a period of time, the more tag this disk can
>> get, and all the information can be updated here(perhaps directly
>> record how many tags a disk can get, then hctx_may_queue() still only
>> require 2 atomic_read()).
> 
> That sounds interesting to me. Do you perhaps plan to implement this 
> approach and to post it as a patch?

Of course, I'll try to send a RFC patch.

Thanks,
Kuai
> 
> Thanks,
> 
> Bart.
> 
> 
> .
>