Re: [PATCH] oom_kill: add option to disable dump_stack()

[Aristeu Rozanski <arozansk-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>]

Hi Michal,
On Mon, Oct 26, 2015 at 06:20:12PM +0100, Michal Hocko wrote:
> I can see why you want to reduce the amount of information, I guess you
> have tried to reduce the loglevel but this hasn't helped because
> dump_stack uses default log level which is too low to be usable, right?
> Or are there any other reasons?

One would be that the stack trace isn't very useful for users IMHO.

> I am not sure sysctl is a good way to tell this particular restriction
> on the output. What if somebody else doesn't want to see the list of
> eligible tasks? Should we add another knob?
>
> Would it make more sense to distinguish different parts of the OOM
> report by loglevel properly?
> pr_err - killed task report
> pr_warning - oom invocation + memory info
> pr_notice - task list
> pr_info - stack trace

That'd work, yes, but I'd think the stack trace would be pr_debug. At a
point that you suspect the OOM killer isn't doing the right thing picking
up tasks and you need more information.

-- 
Aristeu