linux-kernel - Re: [RFC v1 1/3] luo: Live Update Orchestrator

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Message-ID: <aAvEqZZeoCo8XF0G@wunner.de>
Date: Fri, 25 Apr 2025 19:21:45 +0200
From: Lukas Wunner <lukas@...ner.de>
To: Pasha Tatashin <pasha.tatashin@...een.com>
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	Pratyush Yadav <ptyadav@...zon.de>
Subject: Re: [RFC v1 1/3] luo: Live Update Orchestrator

On Thu, Mar 27, 2025 at 03:29:18PM -0400, Pasha Tatashin wrote:
> 3. Dependency Management: The viability of preserving a specific
> resource (file, device) will be checked when it initially requests
> participation.
> However, the actual dependencies will only be pulled and the final
> ordered list assembled during the prepare phase. This avoids the churn
> of repeatedly adding/removing dependencies as individual components
> register.
[...]
> The overall preservation sequence involve processing these handles in
> a specific order:
> 
> Preserved File Descriptors (e.g., memfd, kvmfd, iommufd, vfiofd)
> Preserved Devices (ordered appropriately, leaves-to-root)
                                            ^^^^^^^^^^^^^^

Device dependencies are no longer strictly hierarchical since the
introduction of device links.  However devices_kset->list already
has the correct order, so if you follow that you should be fine.
Just be careful not to assume it's always in hierarchical order.

Thanks,

Lukas