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

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Date:	Mon, 2 Feb 2009 19:42:33 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	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

* KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> [2009-02-02 21:59:34]:

> Hi
> 
> > +void mem_cgroup_print_mem_info(struct mem_cgroup *memcg)
> > +{
> > +	printk(KERN_WARNING "Memory cgroups's name %s\n",
> > +		memcg->css.cgroup->dentry->d_name.name);
> > +	printk(KERN_WARNING "Memory cgroup RSS : 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 "Memory cgroup swap: 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));
> 
> s/res/memsw/ ?
> 
> and, I don't like the name of "Memory cgroup RSS" and "Memory cgroup swap".
> it seems misleading. memcg->res doesn't only count count rss, but also cache.
> memcg->memsw doesn't only count swap, but also memory.
> 
> otherthing, I think it is good patch for me :)
>

Good point, I fixed the res/memsw problem and sent out a patch. About
the RSS thing, not sure what to call it, just calling it memory can be
confusing, may be I should call it

Memory and Memory+swap

Thanks for the review 

-- 
	Balbir
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