Message-ID: <CAGETcx-5r6+-9q1GCOry6PP1hALMuPbwSco7jdcNZ24MTMcBpw@mail.gmail.com>
Date: Tue, 5 Nov 2024 19:41:42 -0800
From: Saravana Kannan <saravanak@...gle.com>
To: "Bird, Tim" <Tim.Bird@...y.com>
Cc: Brian Masney <bmasney@...hat.com>, 
	"linux-embedded@...r.kernel.org" <linux-embedded@...r.kernel.org>, 
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Boot-time initiative (SIG) thoughts and next steps

On Tue, Nov 5, 2024 at 4:45 PM Bird, Tim <Tim.Bird@...y.com> wrote:
>
>
>
> > -----Original Message-----
> > From: Brian Masney <bmasney@...hat.com>
> > Sent: Tuesday, November 5, 2024 5:10 PM
> > To: Saravana Kannan <saravanak@...gle.com>
> > Cc: Bird, Tim <Tim.Bird@...y.com>; linux-embedded@...r.kernel.org; linux-kernel@...r.kernel.org
> > Subject: Re: Boot-time initiative (SIG) thoughts and next steps
> >
> > On Mon, Oct 28, 2024 at 03: 33: 29PM -0700, Saravana Kannan wrote: > On Sun, Oct 27, 2024 at 6: 30 PM Bird, Tim
> > <Tim. Bird@ sony. com> wrote: > > > On Fri, Oct 25, 2024 at 11: 18 AM Bird, Tim <Tim. Bird@ sony. com> wrote: >
> >
> > On Mon, Oct 28, 2024 at 03:33:29PM -0700, Saravana Kannan wrote:
> > > On Sun, Oct 27, 2024 at 6:30 PM Bird, Tim <Tim.Bird@...y.com> wrote:
> > > > > On Fri, Oct 25, 2024 at 11:18 AM Bird, Tim <Tim.Bird@...y.com> wrote:
> > > > > > = wiki account =
> > > > > > The wiki where we'll be maintaining information about
> > > > > > boot time, and about activities of the boot time SIG, is the elinux wiki.
> > > > > > The page we'll be focusing on is: https://elinux.org/Boot_Time.
> > > > > > If you are interested in helping update and maintain the information there
> > > > > > (which I hope almost everyone is), then please make sure you have a user
> > > > > > account on the wiki.
> > > > > > If you don't have one, please go here:
> > > > > > https://elinux.org/Special:RequestAccount
> > > > > > I have to manually approve accounts in order to fight spambots.  It might
> > > > > > take a few days for me to get to your request.  It's very helpful if you
> > > > > > put a comment in one of the request fields about this being related to
> > > > > > the boot-time initiative or SIG, so I can distinguish your request from
> > > > > > spam requests.
> > > > >
> > > > > Can we instead keep this all a part of the kernel docs instead of the
> > > > > wiki? Couple of reasons for that:
> > > >
> > > > Ideally, we would put some material in the wiki, and also
> > > > produce a document - some kind of "boot-time tuning guide" that can
> > > > live in the kernel tree.
> > >
> > > This is the part I care most about being in the kernel docs. Eg: what
> > > configs to use. What commandline params to set. Dos and Don'ts for the
> > > drivers, etc. So, good to see that is an acceptable option.
> >
> > I'm interested to help contribute to a boot speed document, and I
> > suspect some others at Red Hat are interested as well. Personally,
> > I would prefer to have a section in the kernel documentation over a
> > Wiki
> OK - that's at least two votes for an upstream kernel doc.
>
> I think it would be good to have a boot time tuning guide upstream.
> I hope to augment that with a tool that will check for various
> items or conditions on a machine, and give a list of recommendations.
> This could go along with the tuning guide.
>
> However, I would still plan to collect some information on the wiki
> that I don't think will be upstreamable.  For example, see this page:
> https://elinux.org/Disable_Console
>
> The first few items on that page could be sentences in a kernel tuning
> guide, but the data from actual uses I don't think belongs there, as
> it will quickly bitrot.  (Indeed the information on that page has already
> bitrotted.)
>
> I think it would be useful to gather this results information on a wiki, but its
> possible that if reports are sent by e-mail, just a few lore links would
> suffice.
>
> > Besides arch-specific recommendations, we can also contribute
> > some boot speed improvement techniques that we've done that are
> > specific to RT.
> That would be great.
>
> > In addition to the recommended configs, I think it would also be
> > beneficial to list some upstream patches that improve boot speed along
> > with the kernel version it was introduced in.
> I think this would be good also.
>
> We should discuss what a kernel boot-time tuning guide should look like
> and how it should be organized.  Starting this may be one of the first
> things the SIG does.

I wrote something like this for the Android ecosystem
https://source.android.com/docs/core/architecture/kernel/boot-time-opt

So, I'm happy to add something like this to the kernel doc if we have
some consensus on having a kernel doc.

-Saravana

> The other one may be a data-gathering tool that
> I've been working on, that (of all things) automatically populates a wiki
> with boot time data.  I will explain my intentions when I post the script
> (likely tomorrow).
>  -- Tim
>

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