Received-SPF: pass (google.com: domain of linux-kernel+bounces-77844-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:45d1:ec00::1 as permitted sender) client-ip=2604:1380:45d1:ec00::1;
Date: Thu, 22 Feb 2024 22:41:06 -0800
From: Christoph Hellwig <hch@infradead.org>
To: "zhaoyang.huang" <zhaoyang.huang@unisoc.com>
Cc: Vincent Guittot <vincent.guittot@linaro.org>,
	Jens Axboe <axboe@kernel.dk>, linux-block@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	Zhaoyang Huang <huangzhaoyang@gmail.com>, steve.kang@unisoc.com
Subject: Re: [PATCHv2 1/2] sched: introduce helper function to calculate
 distribution over sched class
Message-ID: <Zdg-AvQpsgB8AS5X@infradead.org>
References: <20240222092220.642294-1-zhaoyang.huang@unisoc.com>
Precedence: bulk
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20240222092220.642294-1-zhaoyang.huang@unisoc.com>

On Thu, Feb 22, 2024 at 05:22:19PM +0800, zhaoyang.huang wrote:
> From: Zhaoyang Huang <zhaoyang.huang@unisoc.com>
> 
> As RT, DL, IRQ time could be deemed as lost time of CFS's task, some
> timing value want to know the distribution of how these spread
> approximately by using utilization account value (nivcsw is not enough
> sometimes). This commit would like to introduce a helper function to
> achieve this goal.

Maybe I'm just thick but this still looks like alphabet soup to me.
Can you try to exlain why this matters, or maybe get help from the
scheduler folks to help with explaining the concepts?