linux-kernel - Re: [PATCH] mm/hugetlb: create hugetlb cgroup file in hugetlb

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Date:	Wed, 12 Dec 2012 13:48:17 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	Xishi Qiu <qiuxishi@...wei.com>
Cc:	Jianguo Wu <wujianguo@...wei.com>, tj@...nel.org,
	lizefan@...wei.com, aneesh.kumar@...ux.vnet.ibm.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Liujiang <jiang.liu@...wei.com>, dhillf@...il.com,
	Jiang Liu <liuj97@...il.com>,
	Hanjun Guo <guohanjun@...wei.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org
Subject: Re: [PATCH] mm/hugetlb: create hugetlb cgroup file in hugetlb_init

On Wed 12-12-12 12:23:29, Michal Hocko wrote:
> On Wed 12-12-12 18:44:13, Xishi Qiu wrote:
[...]
> > Hi Michal,
> > 
> > __initcall functions will be called in
> > start_kernel()
> > 	rest_init()  // -> slab is already
> > 		kernel_init()
> > 			kernel_init_freeable()
> > 				do_basic_setup()
> > 					do_initcalls()
> > 
> > and setup_hugepagesz() will be called in
> > start_kernel()
> > 	parse_early_param()  // -> before mm_init() -> kmem_cache_init()
> > 
> > Is this right?
> 
> Yes this is right. I just noticed that kmem_cache_init_late is an __init
> function as well and didn't realize it is called directly. Sorry about
> the confusion.
> Anyway I still think it would be a better idea to move the call into the
> hugetlb_cgroup_create callback where it is more logical IMO but now that
> I'm looking at other controllers (blk and kmem.tcp) they all do this from
> init calls as well. So it doesn't make sense to have hugetlb behave
> differently.
> 
> So
> Acked-by: Michal Hocko <mhocko@...e.cz>

Ohh, and this deserves to be backported to stable (since 3.6).
-- 
Michal Hocko
SUSE Labs
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