linux-kernel - Re: [PATCH 2/4] sched/eevdf: Sort the rbtree by virtual deadline

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Message-ID: <20231107110327.GU8262@noisy.programming.kicks-ass.net>
Date:   Tue, 7 Nov 2023 12:03:27 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Abel Wu <wuyun.abel@...edance.com>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Valentin Schneider <valentin.schneider@....com>,
        Barry Song <21cnbao@...il.com>,
        Benjamin Segall <bsegall@...gle.com>,
        Chen Yu <yu.c.chen@...el.com>,
        Daniel Jordan <daniel.m.jordan@...cle.com>,
        "Gautham R . Shenoy" <gautham.shenoy@....com>,
        Joel Fernandes <joel@...lfernandes.org>,
        K Prateek Nayak <kprateek.nayak@....com>,
        Mike Galbraith <efault@....de>,
        Qais Yousef <qyousef@...alina.io>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Yicong Yang <yangyicong@...wei.com>,
        Youssef Esmat <youssefesmat@...omium.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] sched/eevdf: Sort the rbtree by virtual deadline

On Tue, Nov 07, 2023 at 05:05:08PM +0800, Abel Wu wrote:

> Sort the task timeline by virtual deadline and keep the min_vruntime
> in the augmented tree, so we can avoid doubling the worst case cost
> and make full use of the cached leftmost node to enable O(1) fastpath
> picking in next patch.

Another very good patch, just a note:

> This patch also cleans up the unused max_vruntime() and adjusts pos
> for some functions.

There's this thing about saying 'this patch' in Changelogs, per
definition the Changelog is about 'this patch' so saying it is a bit
redundant.

It even gets mentioned in the Documentation on submitting patches
somewhere.

But what I care about more is this patch doing extra unrelated things,
this should be split out.