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

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Message-ID: <alpine.DEB.2.21.1807031832540.110853@chino.kir.corp.google.com>
Date:   Tue, 3 Jul 2018 18:34:48 -0700 (PDT)
From:   David Rientjes <rientjes@...gle.com>
To:     Rodrigo Freire <rfreire@...hat.com>
cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: be more informative in OOM task list

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.