Re: [PATCH] printk: Add caller information to printk() output.
From: Sergey Senozhatsky
Date: Fri Dec 07 2018 - 00:31:13 EST
On (12/07/18 13:58), Tetsuo Handa wrote:
> > All you need is a way to reconstruct a message around
> > some very specific place in the log - say in a range [-500, +500] lines,
> > assuming that a backtrace you are trying to reconstruct is badly fragmented.
> > I think, even 3 lower digits of a PID should do the trick.
>
> 3 lower digits is insufficient for reconstructing PID of interest; it can
> conflict at 1/1000 probability.
OK. So you want to "trace" PID, not just a way to reconstruct fragmented
backtraces in particular places of a serial log file; that's a different
story.
> [15.922239TABI/] e1000: ens32 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: None
> [15.923927TABYb] IPv6: ADDRCONF(NETDEV_UP): ens32: link is not ready
> [15.930537TABI/] IPv6: ADDRCONF(NETDEV_CHANGE): ens32: link becomes ready
> [40.506011CAAAA] random: crng init done
> [926.716687TAAAB] reboot: Power down
> ----------------------------------------
Please, no.
PIDs, fixed size area, human readable. Just like Petr suggested.
[ 123.12312][ T234] apic: boom
-ss