linux-kernel - Re: [RFC PATCH v3 3/3] genirq/cpuhotplug: Adjust managed irqs according to change of housekeeping CPU

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Message-ID: <CADDUTFyxC-bFWR3pUa_zCYbr5AcQeno1gC_oa3evks5bci18vQ@mail.gmail.com>
Date: Mon, 6 Jan 2025 16:39:56 +0200
From: Costa Shulyupin <costa.shul@...hat.com>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: longman@...hat.com, ming.lei@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v3 3/3] genirq/cpuhotplug: Adjust managed irqs
 according to change of housekeeping CPU

On Tue, 29 Oct 2024 at 20:54, Thomas Gleixner <tglx@...utronix.de> wrote:
> CPU hotplug solves this problem without any hackery. Take a CPU offline,
> change the mask of that CPU and bring it online again. Repeat until all
> CPU changes are done.

Unfortunately, CPU hotplug interferes with realtime tests and is far from
suitable for CPU isolation.

Details:
- https://lore.kernel.org/lkml/87frmj73qj.ffs@tglx/
- https://lore.kernel.org/lkml/Z3l_2CiDgmDmAktE@csail.mit.edu/

Thank you,
Costa