linux-kernel - is there any dynamic equivalent to the "isolcpus=managed

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Message-ID: <a6a073ef-e208-44cb-b41f-85c29c42ee9c@usask.ca>
Date: Thu, 24 Oct 2024 13:04:04 -0600
From: Chris Friesen <cbf123@...sk.ca>
To: LKML <linux-kernel@...r.kernel.org>
Subject: is there any dynamic equivalent to the "isolcpus=managed_irq" boot
 arg?

Hi all,

In the kernel boot args we can specify something like 
"isolcpus=managed_irq,nohz,domain,<cpu-list>" to tell the kernel to 
isolate a given set of CPUs and *also* prevent them from being targeted 
by managed interrupts.

The boot-time isolcpus mechanism is deprecated, so is there a runtime 
equivalent to tell the kernel to avoid certain CPUs for managed 
interrupts?   I just stumbled over https://lkml.org/lkml/2024/9/16/563 
which makes me think the answer might be that no such mechanism exists 
currently.

I'm not subscribed to the list so please CC me on replies.

Thanks,
Chris Friesen