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

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Message-ID: <20240419162428.GB23130@noisy.programming.kicks-ass.net>
Date: Fri, 19 Apr 2024 18:24:28 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Chen Yu <yu.c.chen@...el.com>
Cc: Xuewen Yan <xuewen.yan94@...il.com>, Abel Wu <wuyun.abel@...edance.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>,
	Yujie Liu <yujie.liu@...el.com>, linux-kernel@...r.kernel.org,
	kernel test robot <oliver.sang@...el.com>,
	Tianchen Ding <dtcccc@...ux.alibaba.com>
Subject: Re: [RFC PATCH] sched/eevdf: Return leftmost entity in pick_eevdf()
 if no eligible entity is found

On Fri, Apr 19, 2024 at 06:04:25PM +0800, Chen Yu wrote:

> > Also, could you put a few words in on how often these clips are hit? I
> > suspect it's fairly rare (but crucial when it does).
> 
> Everytime it happens a subsequent NULL pointer exception usually happens.
> The trace data was posted here: 

That was not the question. Suppose I put a printk whenever the clamp()
actually changes the value, do I get a stormflood of output, or do I get
a sporadic blip.