linux-kernel - Re: [PATCH 1/2] sched: Feature to decide if steal should update CPU capacity

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Message-ID: <48f6372c-5cc6-472d-b2d2-31e151d85652@amd.com>
Date: Wed, 29 Oct 2025 11:38:35 +0530
From: K Prateek Nayak <kprateek.nayak@....com>
To: Shrikanth Hegde <sshegde@...ux.ibm.com>, Srikar Dronamraju
	<srikar@...ux.ibm.com>, <linux-kernel@...r.kernel.org>
CC: Michael Ellerman <mpe@...erman.id.au>, Madhavan Srinivasan
	<maddy@...ux.ibm.com>, <linuxppc-dev@...ts.ozlabs.org>, Ben Segall
	<bsegall@...gle.com>, Christophe Leroy <christophe.leroy@...roup.eu>,
	"Dietmar Eggemann" <dietmar.eggemann@....com>, Ingo Molnar
	<mingo@...hat.com>, "Juri Lelli" <juri.lelli@...hat.com>, Mel Gorman
	<mgorman@...e.de>, Nicholas Piggin <npiggin@...il.com>, Peter Zijlstra
	<peterz@...radead.org>, Steven Rostedt <rostedt@...dmis.org>, Thomas Gleixner
	<tglx@...utronix.de>, "Valentin Schneider" <vschneid@...hat.com>, Vincent
 Guittot <vincent.guittot@...aro.org>
Subject: Re: [PATCH 1/2] sched: Feature to decide if steal should update CPU
 capacity

Hello Shrikanth,

On 10/28/2025 8:35 PM, Shrikanth Hegde wrote:
>> @@ -792,8 +792,11 @@ static void update_rq_clock_task(struct rq *rq, s64 delta)
>>       rq->clock_task += delta;
>>     #ifdef CONFIG_HAVE_SCHED_AVG_IRQ
> 
> Curious to know if there are users/distro which have CONFIG_HAVE_SCHED_AVG_IRQ=n

Some arch such as s390 doesn't select HAVE_IRQ_TIME_ACCOUNTING which
disables IRQ_TIME_ACCOUNTING and HAVE_SCHED_AVG_IRQ.

Checking the Ubuntu 22.04 6.8.0-86-generic config on my machine shows
CONFIG_IRQ_TIME_ACCOUNTING is disabled by default. Same is the case
with 6.14.0-34-generic config on Ubuntu 24.04.

-- 
Thanks and Regards,
Prateek