linux-kernel - Re: [RFC v2 11/16] luo: luo_sysfs: add sysfs state monitoring

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Message-ID: <mafs0plfirwh3.fsf@kernel.org>
Date: Thu, 05 Jun 2025 18:20:40 +0200
From: Pratyush Yadav <pratyush@...nel.org>
To: Pasha Tatashin <pasha.tatashin@...een.com>
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Subject: Re: [RFC v2 11/16] luo: luo_sysfs: add sysfs state monitoring

On Thu, May 15 2025, Pasha Tatashin wrote:

> Introduce a sysfs interface for the Live Update Orchestrator
> under /sys/kernel/liveupdate/. This interface provides a way for
> userspace tools and scripts to monitor the current state of the LUO
> state machine.

I am not sure if adding and maintaining a new UAPI that does the same
thing is worth it. Can't we just have commandline utilities that can do
the ioctls and fetch the LUO state, and those can be called from tools
and scripts?

>
> The main feature is a read-only file, state, which displays the
> current LUO state as a string ("normal", "prepared", "frozen",
> "updated"). The interface uses sysfs_notify to allow userspace
> listeners (e.g., via poll) to be efficiently notified of state changes.
>
> ABI documentation for this new sysfs interface is added in
> Documentation/ABI/testing/sysfs-kernel-liveupdate.
>
> This read-only sysfs interface complements the main ioctl interface
> provided by /dev/liveupdate, which handles LUO control operations and
> resource management.
>
> Signed-off-by: Pasha Tatashin <pasha.tatashin@...een.com>
[...]

-- 
Regards,
Pratyush Yadav