Re: [PATCH v3 3/3] oom: decouple mems_allowed from oom_unkillable_task

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On Wed, 26 Jun 2019 17:18:26 +0800 Michal Hocko wrote:
> On Wed 26-06-19 17:12:10, Hillf Danton wrote:
> >
> > On Mon, 24 Jun 2019 14:27:11 -0700 (PDT) Shakeel Butt wrote:
> > >
> > > @@ -1085,7 +1091,8 @@ bool out_of_memory(struct oom_control *oc)
> > >  	check_panic_on_oom(oc, constraint);
> > > 
> > >  	if (!is_memcg_oom(oc) && sysctl_oom_kill_allocating_task &&
> > > -	    current->mm && !oom_unkillable_task(current, oc->nodemask) &&
> > > +	    current->mm && !oom_unkillable_task(current) &&
> > > +	    has_intersects_mems_allowed(current, oc) &&
> > For what?
> 
> This is explained in the changelog I believe - see the initial section

Correct, Sir.

> about the history and motivation for the check. This patch removes it

I'd read that again.

> from oom_unkillable_task so we have to check it explicitly here.
> 
Thank you very much for the light you are casting, Sir.

--
Hillf
> > >  	    current->signal->oom_score_adj !=3D OOM_SCORE_ADJ_MIN) {
> > >  		get_task_struct(current);
> > >  		oc->chosen =3D current;
> > > --
> > > 2.22.0.410.gd8fdbe21b5-goog
> 
> --
> Michal Hocko
> SUSE Labs




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