linux-kernel - Re: [PATCHSET block/for-next] blkcg: Improve blkg config helpers and make iolatency init lazy

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Message-ID: <Y7cdV0vlExjtkF6C@slm.duckdns.org>
Date:   Thu, 5 Jan 2023 08:56:23 -1000
From:   Tejun Heo <tj@...nel.org>
To:     axboe@...nel.dk, josef@...icpanda.com, hch@....de
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHSET block/for-next] blkcg: Improve blkg config helpers and
 make iolatency init lazy

On Wed, Jan 04, 2023 at 02:20:03PM -1000, Tejun Heo wrote:
> Hello,
> 
> * Improve blkg config helpers so that they can be used consistently for all
>   the existing use cases. This also allows keeps using the same bdev open
>   instance across lazy init of rq_qos policies.
> 
> * Update iolatency so that it initializes lazily when a latency target is
>   set for the first time. This avoids registering the rq_qos policy when
>   iolatency is not used which removes unnecessary calls into iolat from IO
>   hot paths.

I forgot to update bfq. Will post v2 soon.

Thanks.

-- 
tejun