linux-kernel - Re: [RFC patch v3 01/20] sched: Cache aware load-balancing

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Message-ID: <20250704084547.GF2001818@noisy.programming.kicks-ass.net>
Date: Fri, 4 Jul 2025 10:45:47 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: "Chen, Yu C" <yu.c.chen@...el.com>
Cc: Shrikanth Hegde <sshegde@...ux.ibm.com>,
	Juri Lelli <juri.lelli@...hat.com>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
	Valentin Schneider <vschneid@...hat.com>,
	Tim Chen <tim.c.chen@...el.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Libo Chen <libo.chen@...cle.com>,
	Abel Wu <wuyun.abel@...edance.com>,
	Madadi Vineeth Reddy <vineethr@...ux.ibm.com>,
	Hillf Danton <hdanton@...a.com>, Len Brown <len.brown@...el.com>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	K Prateek Nayak <kprateek.nayak@....com>,
	"Gautham R . Shenoy" <gautham.shenoy@....com>,
	Tim Chen <tim.c.chen@...ux.intel.com>
Subject: Re: [RFC patch v3 01/20] sched: Cache aware load-balancing

On Fri, Jul 04, 2025 at 04:40:39PM +0800, Chen, Yu C wrote:

> > > @@ -953,6 +953,10 @@ config NUMA_BALANCING
> > > ?????????????? This system will be inactive on UMA systems.
> > > +config SCHED_CACHE
> > > +?????? bool "Cache aware scheduler"
> > > +?????? default y
> > > +
> > 
> > Should it depend on EXPERT?
> > IMO this could add quite a bit of overhead and maybe n by default?
> > 
> 
> I would leave this to Peter and Tim to decide.

Runtime controls are always better than compile time. Distros will have
no choice but to enable the config option.

But that is not the kind of thing you start a series with. First
versions didn't even have the config option. First you make it work,
then later you worry about silly detail.