linux-kernel - Re: [PATCH v2 2/3] sched/fair: Change likelyhood of nohz.nr

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Message-ID: <41202126-cf45-46f8-9506-126072bfe0fe@amd.com>
Date: Tue, 6 Jan 2026 11:20:10 +0530
From: K Prateek Nayak <kprateek.nayak@....com>
To: Shrikanth Hegde <sshegde@...ux.ibm.com>
CC: <linux-kernel@...r.kernel.org>, <juri.lelli@...hat.com>,
	<vschneid@...hat.com>, <tglx@...utronix.de>, <dietmar.eggemann@....com>,
	<anna-maria@...utronix.de>, <frederic@...nel.org>, <wangyang.guo@...el.com>,
	<mingo@...nel.org>, <peterz@...radead.org>, <vincent.guittot@...aro.org>
Subject: Re: [PATCH v2 2/3] sched/fair: Change likelyhood of nohz.nr_cpus and
 do stats update if its due

Hello Shrikanth,

On 1/6/2026 9:53 AM, Shrikanth Hegde wrote:
>> There are also nuances like the smp_mb__after_atomic() in
> 
> That reminds me, need to upgrade this to smp_mb now, given atomic is gone.

Isn't cpumask_set_cpu() also an atomic op?

set_bit() has a comment stating it is a "relaxed atomic operation" in
asm-generic/bitops/instrumented-atomic.h which makes it similar to a
atomic_inc().
-- 
Thanks and Regards,
Prateek