linux-kernel - Re: [PATCH] mm: be more informative in OOM task list

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Date:   Wed, 4 Jul 2018 10:36:49 -0400
From:   Rafael Aquini <aquini@...hat.com>
To:     David Rientjes <rientjes@...gle.com>
Cc:     Rodrigo Freire <rfreire@...hat.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: be more informative in OOM task list

On Tue, Jul 03, 2018 at 06:34:48PM -0700, David Rientjes wrote:
> On Sun, 1 Jul 2018, Rodrigo Freire wrote:
> 
> > The default page memory unit of OOM task dump events might not be
> > intuitive for the non-initiated when debugging OOM events. Add
> > a small printk prior to the task dump informing that the memory
> > units are actually memory _pages_.
> > 
> > Signed-off-by: Rodrigo Freire <rfreire@...hat.com>
> > ---
> >  mm/oom_kill.c | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/mm/oom_kill.c b/mm/oom_kill.c
> > index 84081e7..b4d9557 100644
> > --- a/mm/oom_kill.c
> > +++ b/mm/oom_kill.c
> > @@ -392,6 +392,7 @@ static void dump_tasks(struct mem_cgroup *memcg, const nodemask_t *nodemask)
> >  	struct task_struct *p;
> >  	struct task_struct *task;
> >  
> > +	pr_info("Tasks state (memory values in pages):\n");
> >  	pr_info("[ pid ]   uid  tgid total_vm      rss pgtables_bytes swapents oom_score_adj name\n");
> >  	rcu_read_lock();
> >  	for_each_process(p) {
> 
> As the author of dump_tasks(), and having seen these values misinterpreted 
> on more than one occassion, I think this is a valuable addition.
> 
> Could you also expand out the "pid" field to allow for seven digits 
> instead of five?  I think everything else is aligned.
> 
> Feel free to add
> 
> Acked-by: David Rientjes <rientjes@...gle.com>
> 
> to a v2.
>

Same here, for a v2:
 
Acked-by: Rafael Aquini <aquini@...hat.com>