linux-kernel - Re: [PATCH v5 06/22] liveupdate: luo

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Message-ID: <CA+CK2bAhJ+Lbm6v375RuZKs40q34gsKHE-N+dD8gKqgzsHCqww@mail.gmail.com>
Date: Wed, 12 Nov 2025 15:47:05 -0500
From: Pasha Tatashin <pasha.tatashin@...een.com>
To: Mike Rapoport <rppt@...nel.org>
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Subject: Re: [PATCH v5 06/22] liveupdate: luo_session: add sessions support

On Wed, Nov 12, 2025 at 3:39 PM Mike Rapoport <rppt@...nel.org> wrote:
>
> On Fri, Nov 07, 2025 at 04:03:04PM -0500, Pasha Tatashin wrote:
> > Introduce concept of "Live Update Sessions" within the LUO framework.
> > LUO sessions provide a mechanism to group and manage `struct file *`
> > instances (representing file descriptors) that need to be preserved
> > across a kexec-based live update.
> >
> > Each session is identified by a unique name and acts as a container
> > for file objects whose state is critical to a userspace workload, such
> > as a virtual machine or a high-performance database, aiming to maintain
> > their functionality across a kernel transition.
> >
> > This groundwork establishes the framework for preserving file-backed
> > state across kernel updates, with the actual file data preservation
> > mechanisms to be implemented in subsequent patches.
> >
> > Signed-off-by: Pasha Tatashin <pasha.tatashin@...een.com>
> > ---
> >  include/linux/liveupdate/abi/luo.h |  81 ++++++
> >  include/uapi/linux/liveupdate.h    |   3 +
> >  kernel/liveupdate/Makefile         |   3 +-
> >  kernel/liveupdate/luo_core.c       |   9 +
> >  kernel/liveupdate/luo_internal.h   |  39 +++
> >  kernel/liveupdate/luo_session.c    | 405 +++++++++++++++++++++++++++++
> >  6 files changed, 539 insertions(+), 1 deletion(-)
> >  create mode 100644 kernel/liveupdate/luo_session.c
> >
> > diff --git a/include/linux/liveupdate/abi/luo.h b/include/linux/liveupdate/abi/luo.h
> > index 9483a294287f..37b9fecef3f7 100644
> > --- a/include/linux/liveupdate/abi/luo.h
> > +++ b/include/linux/liveupdate/abi/luo.h
> > @@ -28,6 +28,11 @@
> >   *     / {
> >   *         compatible = "luo-v1";
> >   *         liveupdate-number = <...>;
> > + *
> > + *         luo-session {
> > + *             compatible = "luo-session-v1";
> > + *             luo-session-head = <phys_addr_of_session_head_ser>;
>
> 'head' reads to me as list head rather than a header. I'd use 'hdr' for the
> latter.

Or just use the full name: "header" ? It is not too long as well.

Pasha

>
> --
> Sincerely yours,
> Mike.