linux-kernel - Re: [RFC v2 05/16] luo: luo

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Message-ID: <aFv9sZj6e8RJldjZ@kernel.org>
Date: Wed, 25 Jun 2025 16:46:25 +0300
From: Mike Rapoport <rppt@...nel.org>
To: Pasha Tatashin <pasha.tatashin@...een.com>
Cc: Pratyush Yadav <pratyush@...nel.org>, Jason Gunthorpe <jgg@...pe.ca>,
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Subject: Re: [RFC v2 05/16] luo: luo_core: integrate with KHO

On Mon, Jun 23, 2025 at 07:29:09AM -0400, Pasha Tatashin wrote:
> On Mon, Jun 23, 2025 at 3:32 AM Mike Rapoport <rppt@...nel.org> wrote:
> >
> > On Wed, Jun 18, 2025 at 01:43:18PM -0400, Pasha Tatashin wrote:
> > > On Wed, Jun 18, 2025 at 1:00 PM Pasha Tatashin
> > >
> > > So currently, KHO provides the following two types of  internal API:
> > >
> > > Preserve memory and metadata
> > > =========================
> > > kho_preserve_folio() / kho_preserve_phys()
> > > kho_unpreserve_folio() / kho_unpreserve_phys()
> > > kho_restore_folio()
> > >
> > > kho_add_subtree() kho_retrieve_subtree()
> > >
> > > State machine
> > > ===========
> > > register_kho_notifier() / unregister_kho_notifier()
> > >
> > > kho_finalize() / kho_abort()
> > >
> > > We should remove the "State machine", and only keep the "Preserve
> > > Memory" API functions. At the time these functions are called, KHO
> > > should do the magic of making sure that the memory gets preserved
> > > across the reboot.
> > >
> > > This way, reserve_mem_init() would call: kho_preserve_folio() and
> > > kho_add_subtree() during boot, and be done with it.
> 
> For completeness, we also need `void kho_remove_substree(const char
> *name);`, currently, all trees are removed during kho_abort(). Let's
> rebase and include this patch on top of the next version of LUO, that
> we are exchanging off list, and send it together later this week.

Oh, here's what I've got:
https://git.kernel.org/pub/scm/linux/kernel/git/rppt/linux.git/tree/?h=luo/v1.1

It complies, passes basic KHO test and LUO selftest.
 
> Thanks,
> Pasha

-- 
Sincerely yours,
Mike.