Linux apanic mechanism and difference from newer ram_console/persistent_rammechanism

[Vijay]

Hello,

I am new to the Kernel-Mailing list. I am not subscribed at the moment
and would really appreciate it, if I can be CC'd in the
reply/responses for my question.

I am studying the different logging mechanisms on Linux in case of a
Kernel panic (OOPS). So far from  my search on the web, I have been
able to derive the following information, please correct me if wrong:

- apanic was an old mechanism of getting the job done.
- ram_console/persistent_ram is a new mechanism.

Could someone enlighten me about the following in this regard ?

- What was the old apanic mechanism, at a high-level how did this work ?

- Why was the apanic mechanism deprecated, in favor of the
ram_console/persistent_ram mechanism ?

- What advantages does the new ram_console/persistent_ram mechinsm
bring to the table.

- In what way is the ram_console/persistent_ram functionally different
from the old apanic approach ?

I am just looking for pointers and high level answers, in some sense a
direction which I can take to research the mechanisms further. I would
appreciate any relevant information in this regard.

Thanks
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