linux-kernel - Re: [-mm patch] Show memcg information during OOM

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Date:	Mon, 2 Feb 2009 12:37:54 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Balbir Singh <balbir@...ux.vnet.ibm.com>
cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	"lizf@...fujitsu.com" <lizf@...fujitsu.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [-mm patch] Show memcg information during OOM

On Mon, 2 Feb 2009, Balbir Singh wrote:

> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 8e4be9c..954b0d5 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -813,6 +813,25 @@ bool mem_cgroup_oom_called(struct task_struct *task)
>  	rcu_read_unlock();
>  	return ret;
>  }
> +
> +void mem_cgroup_print_mem_info(struct mem_cgroup *memcg)
> +{
> +	if (!memcg)
> +		return;
> +
> +	printk(KERN_WARNING "Memory cgroups's name %s\n",
> +		memcg->css.cgroup->dentry->d_name.name);
> +	printk(KERN_WARNING "Cgroup memory: usage %llu, limit %llu"
> +		" failcnt %llu\n", res_counter_read_u64(&memcg->res, RES_USAGE),
> +		res_counter_read_u64(&memcg->res, RES_LIMIT),
> +		res_counter_read_u64(&memcg->res, RES_FAILCNT));
> +	printk(KERN_WARNING "Cgroup memory+swap: usage %llu, limit %llu "
> +		"failcnt %llu\n",
> +		res_counter_read_u64(&memcg->memsw, RES_USAGE),
> +		res_counter_read_u64(&memcg->memsw, RES_LIMIT),
> +		res_counter_read_u64(&memcg->memsw, RES_FAILCNT));
> +}
> +
>  /*
>   * Unlike exported interface, "oom" parameter is added. if oom==true,
>   * oom-killer can be invoked.

I think you'd want a less critical log level for these messages such as 
KERN_INFO.
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