linux-kernel - Re: [PATCH 04/19] sched/fair: Introduce a static key to enable cache aware only for multi LLCs

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Message-ID: <0a6fce4b-d96f-492e-ad7c-d1fde723cc33@amd.com>
Date: Tue, 28 Oct 2025 08:16:23 +0530
From: K Prateek Nayak <kprateek.nayak@....com>
To: "Chen, Yu C" <yu.c.chen@...el.com>
CC: Vincent Guittot <vincent.guittot@...aro.org>, 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>, "Madadi Vineeth
 Reddy" <vineethr@...ux.ibm.com>, Hillf Danton <hdanton@...a.com>, "Shrikanth
 Hegde" <sshegde@...ux.ibm.com>, Jianyong Wu <jianyong.wu@...look.com>, Yangyu
 Chen <cyy@...self.name>, Tingyin Duan <tingyin.duan@...il.com>, "Vern Hao"
	<vernhao@...cent.com>, Len Brown <len.brown@...el.com>, Aubrey Li
	<aubrey.li@...el.com>, Zhao Liu <zhao1.liu@...el.com>, Chen Yu
	<yu.chen.surf@...il.com>, Adam Li <adamli@...amperecomputing.com>, Tim Chen
	<tim.c.chen@...el.com>, <linux-kernel@...r.kernel.org>, Tim Chen
	<tim.c.chen@...ux.intel.com>, Peter Zijlstra <peterz@...radead.org>, "Gautham
 R . Shenoy" <gautham.shenoy@....com>, Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH 04/19] sched/fair: Introduce a static key to enable cache
 aware only for multi LLCs

Hello Chenyu,

On 10/27/2025 6:26 PM, Chen, Yu C wrote:
> build_sched_domains() might get invoked to rebuild the corresponding sched
> domains during CPU hotplug via cpuset subsystem. So if the CPU gets online
> after bootup, we still have the chance to detect multiple LLCs I suppose?

Ah yes! Thank you for confirming.

-- 
Thanks and Regards,
Prateek