Re: [PATCH 06/10] mm, oom: kill all tasks sharing the mm

[Michal Hocko]

On Wed 08-06-16 15:51:20, David Rientjes wrote:
> On Wed, 8 Jun 2016, Michal Hocko wrote:
> 
> > > Why is the patch asking users to report oom killing of a process that 
> > > raced with setting /proc/pid/oom_score_adj to OOM_SCORE_ADJ_MIN?  What is 
> > > possibly actionable about it?
> > 
> > Well, the primary point is to know whether such races happen in the real
> > loads and whether they actually matter. If yes we can harden the locking
> > or come up with a less racy solutions.
> 
> A thread being set to oom disabled while racing with the oom killer 
> obviously isn't a concern: it could very well be set to oom disabled after 
> the SIGKILL is sent and before the signal is handled, and that's not even 
> fixable without unneeded complexity because we don't know the source of 
> the SIGKILL.  Please remove the printk entirely.

OK, if you find it more confusing than useful I will not insist.

-- 
Michal Hocko
SUSE Labs