linux-kernel - Re: [RFC] blk-mq: clean up the hctx restart

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Date:   Thu, 2 Aug 2018 17:24:15 +0000
From:   Bart Van Assche <Bart.VanAssche@....com>
To:     "ming.lei@...hat.com" <ming.lei@...hat.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "jianchao.w.wang@...cle.com" <jianchao.w.wang@...cle.com>,
        "axboe@...nel.dk" <axboe@...nel.dk>
Subject: Re: [RFC] blk-mq: clean up the hctx restart

On Fri, 2018-08-03 at 01:17 +0800, Ming Lei wrote:
> Not mentioning big CPU utilization is consumed unnecessarily for iterating
> over all queues even though there is only one active queue, is this fair from
> system view?

I hope that someone will come up some day with a better solution than the
list_for_each_entry_rcu_rr() loop. But as long as such a solution has not yet
been found that loop should stay in order to preserve fair handling of large
numbers of LUNs.

Bart.