netdev - Re: [PATCH v2 1/7] Basic kernel memory functionality for the Memory Controller

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Date:	Sun, 18 Sep 2011 22:05:09 +0300
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Glauber Costa <glommer@...allels.com>
Cc:	linux-kernel@...r.kernel.org, paul@...lmenage.org,
	lizf@...fujitsu.com, kamezawa.hiroyu@...fujitsu.com,
	ebiederm@...ssion.com, davem@...emloft.net, gthelen@...gle.com,
	netdev@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v2 1/7] Basic kernel memory functionality for the Memory
 Controller

On Sun, Sep 18, 2011 at 12:39:12AM -0300, Glauber Costa wrote:
> > No kernel memory accounting for root cgroup, right?
> Not sure. Maybe kernel memory accounting is useful even for root cgroup. 
> Same as normal memory accounting... what we want to avoid is kernel 
> memory limits. OTOH, if we are not limiting it anyway, accounting it is 
> just useless overhead... Even the statistics can then be gathered 
> through all
> the proc files that show slab usage, I guess?

It's better to leave root cgroup without accounting. At least for now.
We can add it later if needed.

> >
> >> @@ -3979,6 +3999,10 @@ static u64 mem_cgroup_read(struct cgroup *cont, struct cftype *cft)
> >>   		else
> >>   			val = res_counter_read_u64(&mem->memsw, name);
> >>   		break;
> >> +	case _KMEM:
> >> +		val = res_counter_read_u64(&mem->kmem, name);
> >> +		break;
> >> +
> >
> > Always zero in root cgroup?
> 
> Yes, if we're not accounting, it should be zero. WARN_ON, maybe?

-ENOSYS?

-- 
 Kirill A. Shutemov
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