On Mon 02-08-21 16:12:50, Aaron Tomlin wrote:

On Mon 2021-08-02 08:34 +0200, Michal Hocko wrote:

quoted

If you really want/need to make any change here then I would propose to
either add E(eligible)/I(ligible) column without any specifics or
consistently skip over all tasks which are not eligible.

How about the suggestion made by David i.e. exposing the value returned by
oom_badness(), as if I understand correctly, this would provide a more
complete picture with regard to the rationale used?

There were some attempts to print oom_score during OOM. E.g.
http://lkml.kernel.org/r/20190808183247.28206-1-echron@arista.com. That
one was rejected on the grounds that the number on its own doesn't
really present any real value. It is really only valuable when comparing
to other potential oom victims. I have to say I am still worried about
printing this internal scoring as it should have really been an
implementation detail but with /proc/<pid>/oom_score this is likely a
lost battle and I am willing to give up on that front.

I am still not entirely convinced this is worth doing though.
oom_badness is not a cheap operation. task_lock has to be taken again
during dump_tasks for each task so the already quite expensive operation
will be more so. Is this really something we cannot live without?
-- 
Michal Hocko
SUSE Labs