linux-kernel - Re: tracing : bootconfig : Early boot config for non intrd systems

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Message-ID: <20220309190651.GA3735@pswork>
Date:   Wed, 9 Mar 2022 20:06:51 +0100
From:   Padmanabha Srinivasaiah <treasure4paddy@...il.com>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     rostedt@...dmis.org, linux-kernel@...r.kernel.org
Subject: Re: tracing : bootconfig : Early boot config for non intrd systems

On Wed, Mar 09, 2022 at 05:01:24PM +0900, Masami Hiramatsu wrote:
> On Tue, 8 Mar 2022 18:48:29 +0100
> Padmanabha Srinivasaiah <treasure4paddy@...il.com> wrote:
> 
> > Hello Masami Hiramatsu,
> > 
> > On Tue, Mar 08, 2022 at 04:36:00PM +0900, Masami Hiramatsu wrote:
> > > Hello Padmanabha,
> > > 
> > > On Mon, 7 Mar 2022 19:40:11 +0100
> > > Padmanabha Srinivasaiah <treasure4paddy@...il.com> wrote:
> > > 
> > > > Hello Masami Hiramatsu,
> > > > 
> > > > Thanks for detailed explanation on boot time tracing using early boot configuration file.
> > > > https://linuxfoundation.org/wp-content/uploads/boottrace-LF-live-2021-update.pdf
> > > > 
> > > > Also for https://lwn.net/Articles/806002/.
> > > > 
> > > > Latter link also states we can embed boot config into the kernel image for non intrd based system.
> > > 
> > > Ah, that was an original plan, but since no one interested in, I didn't implement it.
> > > So we still need the initrd for bootconfig.
> > >
> > Ok.
> > > > 
> > > > I tried searching mailing lists not able to find pointer for same.
> > > > 
> > > > A hint/pointer on how-to will be very helpful. 
> > > 
> > > BTW, what is your problem, could you share your use-case?
> > > 
> > 
> > I have hetrogenous system which donot use intrd.
> > 
> > The use-case is to capture __system wide__ event based tracing for
> > boot-up sequence, which also covers early stage of default init programs
> > used.
> > 
> > As buffer size is limited, will have hand-picked events set configured.
> 
> Hm, so I guess you will boot linux from your custom bootloader (or binary loader on sub processor?).
>
Yes, customised implemation which loads linux. 

> Can you even try to add a dummy initrd? or are you OK to rebuild kernel for embedding the bootconfig data?
Yes, re-building the kernel image to appended bootconfig data is feasable option.

> If both don't work, the solution will be architecture or bootloader specific.
> 
> Thank you,
>

Thanks and Regards,
Padmanabha.S
> -- 
> Masami Hiramatsu <mhiramat@...nel.org>