linux-kernel - Re: [PATCH] Add the memcg print oom info for system oom

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Date:   Thu, 17 May 2018 09:11:40 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     ufo19890607 <ufo19890607@...il.com>
Cc:     akpm@...ux-foundation.org, rientjes@...gle.com,
        kirill.shutemov@...ux.intel.com, aarcange@...hat.com,
        penguin-kernel@...ove.SAKURA.ne.jp, guro@...com,
        yang.s@...baba-inc.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        yuzhoujian <yuzhoujian@...ichuxing.com>
Subject: Re: [PATCH] Add the memcg print oom info for system oom

On Thu 17-05-18 08:00:28, ufo19890607 wrote:
> From: yuzhoujian <yuzhoujian@...ichuxing.com>
> 
> The dump_header does not print the memcg's name when the system
> oom happened. Some users want to locate the certain container
> which contains the task that has been killed by the oom killer.
> So I add the mem_cgroup_print_oom_info when system oom events
> happened.

The oom report is quite heavy today. Do we really need the full memcg
oom report here. Wouldn't it be sufficient to print the memcg the task
belongs to?

> Signed-off-by: yuzhoujian <yuzhoujian@...ichuxing.com>
> ---
>  mm/oom_kill.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/mm/oom_kill.c b/mm/oom_kill.c
> index 8ba6cb88cf58..244416c9834a 100644
> --- a/mm/oom_kill.c
> +++ b/mm/oom_kill.c
> @@ -433,6 +433,7 @@ static void dump_header(struct oom_control *oc, struct task_struct *p)
>  	if (is_memcg_oom(oc))
>  		mem_cgroup_print_oom_info(oc->memcg, p);
>  	else {
> +		mem_cgroup_print_oom_info(mem_cgroup_from_task(p), p);
>  		show_mem(SHOW_MEM_FILTER_NODES, oc->nodemask);
>  		if (is_dump_unreclaim_slabs())
>  			dump_unreclaimable_slab();
> -- 
> 2.14.1
> 

-- 
Michal Hocko
SUSE Labs