Messages in this thread | | | Date | Wed, 09 Sep 2009 09:47:24 +0800 | From | Li Zefan <> | Subject | Re: [PATCH 1/2] tracing: Add sysctl to enable/disable tracing on oops |
| |
Steven Rostedt wrote: > On Wed, 2009-09-09 at 09:37 +0800, Li Zefan wrote: >> Steven Rostedt wrote: >>> On Wed, 2009-09-09 at 09:15 +0800, Li Zefan wrote: >>>> Currently we always disable tracing on oops, and this patch >>>> adds a sysctl so one can choose to enable it. >>> Hmm, we already have a way to enable it. >>> >>> # echo 1 > /debug/tracing/tracing_on >>> >> What I want is a way to not disable it when an oops happened. :) >> > > Ah, I misunderstood. May I ask a silly question? > > Why? >
Otherwise we won't get trace output from trae_crash_kexec if crash_kexec() is not called by panic(). For example:
oops_begin() ->trace_off() ->panic_on_oops ->kexec_should_crash() ->crash_kexec()
| |