Messages in this thread | | | Date | Wed, 9 Mar 2022 20:06:51 +0100 | From | Padmanabha Srinivasaiah <> | Subject | Re: tracing : bootconfig : Early boot config for non intrd systems |
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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@gmail.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@gmail.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@kernel.org>
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