linux-kernel - Re: [PATCH] block: kyber: make kyber more friendly with merging

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Message-ID: <08921b9d-0f31-f31d-096f-6c4f3a1e4d4f@oracle.com>
Date:   Wed, 30 May 2018 17:20:10 +0800
From:   "jianchao.wang" <jianchao.w.wang@...cle.com>
To:     Ming Lei <tom.leiming@...il.com>
Cc:     Omar Sandoval <osandov@...ndov.com>, Jens Axboe <axboe@...nel.dk>,
        linux-block <linux-block@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] block: kyber: make kyber more friendly with merging

Hi ming

On 05/30/2018 05:13 PM, Ming Lei wrote:
>> Yes, it maybe good for merging of 'none', because the rq_list is split into 3
>> lists, and not need to iterate the whole rq_list any more.
>> But what's about the dispatch when there is no io scheduler.
> blk_mq_flush_busy_ctxs() and blk_mq_dequeue_from_ctx() should work
> fine in case of 'none' if per-domain list is added to ctx. Then we can make
> none to be a bit fair on READ/WRITE.
> 

But how to determine when to dispatch READ, WRITE or other more, when there is no io scheduler ?

Thanks
Jianchao