linux-kernel - Re: [PATCH] sched/nohz: Fix NOHZ imbalance by adding options for ILB CPU

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Message-ID: <cc41029e-ca82-bf3c-0cb9-c7bd907a4680@gentwo.org>
Date: Wed, 3 Sep 2025 13:33:16 -0700 (PDT)
From: "Christoph Lameter (Ampere)" <cl@...two.org>
To: Vincent Guittot <vincent.guittot@...aro.org>
cc: Valentin Schneider <vschneid@...hat.com>, 
    Adam Li <adamli@...amperecomputing.com>, mingo@...hat.com, 
    peterz@...radead.org, juri.lelli@...hat.com, dietmar.eggemann@....com, 
    rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de, 
    frederic@...nel.org, linux-kernel@...r.kernel.org, 
    patches@...erecomputing.com
Subject: Re: [PATCH] sched/nohz: Fix NOHZ imbalance by adding options for
 ILB CPU

On Wed, 3 Sep 2025, Vincent Guittot wrote:

> > AFAICT we have (at least) two options:
> > 1) Trigger NOHZ balancing on a busy housekeeping CPU (what this patch does)


Isnt there a third option?

3) Trigger load balancing if on a NOHZ_FULL cpu and multiple processes are
running on it.