linux-kernel - Re: [RFC PATCH] sched/eevdf: Return leftmost entity in pick

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Message-ID: <20240408120045.GG21904@noisy.programming.kicks-ass.net>
Date: Mon, 8 Apr 2024 14:00:45 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Abel Wu <wuyun.abel@...edance.com>
Cc: Chen Yu <yu.c.chen@...el.com>, Ingo Molnar <mingo@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Juri Lelli <juri.lelli@...hat.com>, Tim Chen <tim.c.chen@...el.com>,
	Tiwei Bie <tiwei.btw@...group.com>,
	Honglei Wang <wanghonglei@...ichuxing.com>,
	Aaron Lu <aaron.lu@...el.com>, Chen Yu <yu.chen.surf@...il.com>,
	linux-kernel@...r.kernel.org,
	kernel test robot <oliver.sang@...el.com>
Subject: Re: [RFC PATCH] sched/eevdf: Return leftmost entity in pick_eevdf()
 if no eligible entity is found

On Fri, Mar 01, 2024 at 04:42:43PM +0800, Abel Wu wrote:

> After a second thought, this doesn't solve the insane huge vruntime
> itself. Since the immediate problem is that 'huge' number actually is
> a small one, is it possible to make vruntime s64 at definition?

In part that was never done because wrapping of signed types in C is UB
and UBSAN used to be buggy. But also, given how it all works, it mostly
doesn't matter.