linux-kernel - Re: [RFC PATCH] blk-mq: hctx has only one ctx mapping is no need to redirect the completion

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Message-ID: <94e530a2-7641-f908-ab0f-94d4c7746d7a@linux.alibaba.com>
Date:   Thu, 22 Sep 2022 15:17:28 +0800
From:   Liu Song <liusong@...ux.alibaba.com>
To:     Christoph Hellwig <hch@....de>
Cc:     axboe@...nel.dk, kbusch@...nel.org, linux-kernel@...r.kernel.org,
        linux-nvme@...ts.infradead.org, sagi@...mberg.me
Subject: Re: [RFC PATCH] blk-mq: hctx has only one ctx mapping is no need to
 redirect the completion


On 2022/9/22 14:20, Christoph Hellwig wrote:

> On Wed, Sep 21, 2022 at 11:32:03AM +0800, Liu Song wrote:
>> From: Liu Song <liusong@...ux.alibaba.com>
>>
>> High-performance NVMe devices usually support a large hw queue, which
> a larger number of?
>
>>   	/*
>> -	 * For a polled request, always complete locally, it's pointless
>> -	 * to redirect the completion.
>> +	 * For request which hctx has only one ctx mapping,
>> +	 * or a polled request, always complete locally,
>> +	 * it's pointless to redirect the completion.
>>   	 */
>> -	if (rq->cmd_flags & REQ_POLLED)
>> +	if (rq->mq_hctx->nr_ctx == 1 ||
>> +		rq->cmd_flags & REQ_POLLED)
> Some very odd comment formatting and and indentation here.

Thanks, I will issue a V2 patch as suggested.