On 10/28/2014 08:44 AM, Andi Kleen wrote: >>> I suppose ... but that would mean I would have to explain to an end user the >>> elaborate process of enabling kdb, inserting a break point, etc. The whole >>> purpose of this is to let an end user panic on WARN() easily. >>> >>> Asking an end user to enable kdb is magnitudes worse than asking them to >>> recompile a kernel. >> >> Agreed. Asking a customer to setup and run kdb and put breakpoints is much >> more pain than simply asking to reboot kernel with a command line option. > > If you have a command line option to execute kdb commands you still > would only have a command line option, just a slightly longer one. > > kdb="on, bp warn_slowpath_common sr c, go" KDB is not on all kernels. This would require me to go to great lengths to explain to a user how to set it up, etc., rather than saying "Hi, please add panic_on_warn as a kernel parameter/echo 1 into /proc/sys/kernel/panic_on_warn and on the next time you see that WARN() the system will panic and kdump. Send me that kdump." > > But it would be a generic facility instead of a special purpose hack. Generic to KDB be configured on and it is in no way trivial to use. P.
