linux-kernel - Re: [PATCH v3 19/30] liveupdate: luo

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Message-ID: <20251009145043.GE3839422@nvidia.com>
Date: Thu, 9 Oct 2025 11:50:43 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Pasha Tatashin <pasha.tatashin@...een.com>
Cc: Pratyush Yadav <pratyush@...nel.org>,
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Subject: Re: [PATCH v3 19/30] liveupdate: luo_sysfs: add sysfs state
 monitoring

On Thu, Oct 09, 2025 at 08:01:13AM -0400, Pasha Tatashin wrote:
> > > Because the window of kernel live update is short, it is difficult to statistics
> > > how many times the kernel is live updated.
> > >
> > > Is it possible to add a variable to statistics the times that the kernel is live
> > > updated?
> >
> > The kernel doesn't do the live update on its own. The process is driven
> > and sequenced by userspace. So if you want to keep statistics, you
> > should do it from your userspace (luod maybe?). I don't see any need for
> > this in the kernel.
> >
> 
> One use case I can think of is including information in kdump or the
> backtrace warning/panic messages about how many times this machine has
> been live-updated. In the past, I've seen bugs (related to memory
> corruption) that occurred only after several kexecs, not on the first
> one. 

That seems like a reasonable point, to do something like a taint where
this is recorded, visible and logged during an oops.

Jason