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

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Message-ID: <20220308174829.GA2471@pswork>
Date:   Tue, 8 Mar 2022 18:48:29 +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

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.

Thanks,
Padmanabha.S

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