[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <Y02qD1dWzU5ZSDEj@slm.duckdns.org>
Date: Mon, 17 Oct 2022 09:16:31 -1000
From: Tejun Heo <tj@...nel.org>
To: Kemeng Shi <shikemeng@...wei.com>
Cc: axboe@...nel.dk, linux-block@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/8] blk-iocost: Remove redundant initialization of
struct ioc_gq
On Mon, Oct 17, 2022 at 10:00:10AM +0800, Kemeng Shi wrote:
> Some member of struct ioc_gq will not be accessed before it's
> first activation and will be initialized again in it's first
> activation after ioc_pd_init. To be more specific:
> 1)Member iocg->vtime and iocg->done_vtime will set to target in
> activation which only expects vtime is equal to done_vtime in
> first activation.
> 2)Member iocg->active_period will be set with ioc->cur_period
> again in first activation.
>
> Remove the redundant initialization to improve ioc_pd_init a
> littile bit.
>
> The parameter now of weight_updated will not be used if iocg is
> not active, so pass NULL to weight_update here is safe and we
> can remove call to ioc_now.
This isn't a meaningful optimization and makes the code fragile for no
practical gain. Let's not do this.
Thanks.
--
tejun
Powered by blists - more mailing lists