linux-kernel - Re: [PATCH -V4 07/10] hugetlbfs: Add memcg control files for hugetlbfs

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Message-ID: <87wr6hjc58.fsf@linux.vnet.ibm.com>
Date:	Mon, 19 Mar 2012 12:44:11 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	linux-mm@...ck.org, mgorman@...e.de, dhillf@...il.com,
	aarcange@...hat.com, mhocko@...e.cz, akpm@...ux-foundation.org,
	hannes@...xchg.org, linux-kernel@...r.kernel.org,
	cgroups@...r.kernel.org
Subject: Re: [PATCH -V4 07/10] hugetlbfs: Add memcg control files for hugetlbfs

On Mon, 19 Mar 2012 11:56:25 +0900, KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:
> (2012/03/17 2:39), Aneesh Kumar K.V wrote:
> 
> > From: "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
> > 
> > This add control files for hugetlbfs in memcg
> > 
> > Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
> 
> 
> I have a question. When a user does
> 
> 	1. create memory cgroup as
> 		/cgroup/A
> 	2. insmod hugetlb.ko
> 	3. ls /cgroup/A
> 
> and then, files can be shown ? Don't we have any problem at rmdir A ?
> 
> I'm sorry if hugetlb never be used as module.

HUGETLBFS cannot be build as kernel module


> 
> a comment below.
> 
> > ---
> >  include/linux/hugetlb.h    |   17 +++++++++++++++
> >  include/linux/memcontrol.h |    7 ++++++
> >  mm/hugetlb.c               |   25 ++++++++++++++++++++++-
> >  mm/memcontrol.c            |   48 ++++++++++++++++++++++++++++++++++++++++++++
> >  4 files changed, 96 insertions(+), 1 deletions(-)


......

> > 
> > +#ifdef CONFIG_MEM_RES_CTLR_HUGETLB
> > +static char *mem_fmt(char *buf, unsigned long n)
> > +{
> > +	if (n >= (1UL << 30))
> > +		sprintf(buf, "%luGB", n >> 30);
> > +	else if (n >= (1UL << 20))
> > +		sprintf(buf, "%luMB", n >> 20);
> > +	else
> > +		sprintf(buf, "%luKB", n >> 10);
> > +	return buf;
> > +}
> > +
> > +int mem_cgroup_hugetlb_file_init(int idx)
> > +{
> 
> 
> __init ? 

Added .

>And... do we have guarantee that this function is called before
> creating root mem cgroup even if CONFIG_HUGETLBFS=y ?
> 

Yes. This should be called before creating root mem cgroup.

-aneesh

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