linux-kernel - Re: [PATCH 2/3] sched/core: Introduce nr

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Message-ID: <YsKrPm0lov9yIQpk@hirez.programming.kicks-ass.net>
Date:   Mon, 4 Jul 2022 10:56:30 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Cruz Zhao <CruzZhao@...ux.alibaba.com>
Cc:     mingo@...hat.com, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
        bristot@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] sched/core: Introduce nr_running percpu for each
 cookie

On Tue, Jun 28, 2022 at 03:57:24PM +0800, Cruz Zhao wrote:
> Introduce a percpu count to struct sched_core_cookie, which indicates how
> many tasks with this cookie in the runqueue of this cpu.

*why* ?!?

Changelog should always motivate why a change is done. The patch itself
mostly shows what it does, it doesn't explain why.