hello i'm writing this letter because i have some questions about
kernel log.

1. The difference between last_kmsg and tombstones?

 i heard last_kmsg is created by kernel panic but i also heard
tombstones is created in same case.
 but when kernel panic happened, i just only got last_kmsg ...

 so i wanna know how and when can i get that files and what is the
difference of meaning between last_kmsg and tombstones?

 2. how to create last_kmsg?

 when the phone is terminated(or reboot) because of kernel panic,
maybe a certain flag is changed.
 when the flag is 1(or 0), it creates last_kmsg file.  (it's just my
guess)

 what i wonder is how can the phone knows whether the kernel panic is
happened or unhappened.
and where (which file) can i see that codes?
 - when kernel boots, check something in ram_console.c but i can't
understand
so please explain process of creating last_kmsg

thank you for your reading ^^

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