linux-kernel - Re: [PATCH 0/4] sched: Various reweight

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Message-ID: <20260204104425.GD3016024@noisy.programming.kicks-ass.net>
Date: Wed, 4 Feb 2026 11:44:25 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: K Prateek Nayak <kprateek.nayak@....com>
Cc: mingo@...nel.org, juri.lelli@...hat.com, vincent.guittot@...aro.org,
	dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
	mgorman@...e.de, vschneid@...hat.com, linux-kernel@...r.kernel.org,
	wangtao554@...wei.com, quzicheng@...wei.com,
	wuyun.abel@...edance.com, dsmythies@...us.net
Subject: Re: [PATCH 0/4] sched: Various reweight_entity() fixes

On Tue, Feb 03, 2026 at 05:49:16PM +0530, K Prateek Nayak wrote:

> > If any of the fields are !0, you tripped an overflow.
> 
> Yup I see a few !0 values. Some inching closer to the BUG_ON()
> 
>  grep "shift.*: [^0]$" /sys/kernel/debug/sched/debug
>   .sum_shift                     : 4
>   .sum_shift                     : 3
>   .sum_shift                     : 5
>   .sum_shift                     : 1
>   .sum_shift                     : 2
>   .sum_shift                     : 3

Whee. Clearly I have some work to do ;-) I'll go prod at this.

Thanks!