linux-kernel - Re: [PATCH -V8 13/16] hugetlb/cgroup: add hugetlb cgroup control files

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Date:	Tue, 12 Jun 2012 17:35:19 +0900
From:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
CC:	linux-mm@...ck.org, dhillf@...il.com, rientjes@...gle.com,
	mhocko@...e.cz, akpm@...ux-foundation.org, hannes@...xchg.org,
	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org
Subject: Re: [PATCH -V8 13/16] hugetlb/cgroup: add hugetlb cgroup control
 files

(2012/06/09 17:59), Aneesh Kumar K.V wrote:
> From: "Aneesh Kumar K.V"<aneesh.kumar@...ux.vnet.ibm.com>
> 
> Add the control files for hugetlb controller
> 
> Signed-off-by: Aneesh Kumar K.V<aneesh.kumar@...ux.vnet.ibm.com>
> ---
>   include/linux/hugetlb.h        |    5 ++
>   include/linux/hugetlb_cgroup.h |    6 ++
>   mm/hugetlb.c                   |    8 +++
>   mm/hugetlb_cgroup.c            |  130 ++++++++++++++++++++++++++++++++++++++++
>   4 files changed, 149 insertions(+)
> 
> diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
> index 4aca057..9650bb1 100644
> --- a/include/linux/hugetlb.h
> +++ b/include/linux/hugetlb.h
> @@ -4,6 +4,7 @@
>   #include<linux/mm_types.h>
>   #include<linux/fs.h>
>   #include<linux/hugetlb_inline.h>
> +#include<linux/cgroup.h>
> 
>   struct ctl_table;
>   struct user_struct;
> @@ -221,6 +222,10 @@ struct hstate {
>   	unsigned int nr_huge_pages_node[MAX_NUMNODES];
>   	unsigned int free_huge_pages_node[MAX_NUMNODES];
>   	unsigned int surplus_huge_pages_node[MAX_NUMNODES];
> +#ifdef CONFIG_CGROUP_HUGETLB_RES_CTLR
> +	/* cgroup control files */
> +	struct cftype cgroup_files[5];
> +#endif
>   	char name[HSTATE_NAME_LEN];
>   };
> 
> diff --git a/include/linux/hugetlb_cgroup.h b/include/linux/hugetlb_cgroup.h
> index ceff1d5..ba4836f 100644
> --- a/include/linux/hugetlb_cgroup.h
> +++ b/include/linux/hugetlb_cgroup.h
> @@ -62,6 +62,7 @@ extern void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages,
>   					 struct page *page);
>   extern void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
>   					   struct hugetlb_cgroup *h_cg);
> +extern int hugetlb_cgroup_file_init(int idx) __init;
>   #else
>   static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
>   {
> @@ -106,5 +107,10 @@ hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
>   {
>   	return;
>   }
> +
> +static inline int __init hugetlb_cgroup_file_init(int idx)
> +{
> +	return 0;
> +}
>   #endif  /* CONFIG_MEM_RES_CTLR_HUGETLB */
>   #endif
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index 1ca2d8f..bf79131 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -30,6 +30,7 @@
>   #include<linux/hugetlb.h>
>   #include<linux/hugetlb_cgroup.h>
>   #include<linux/node.h>
> +#include<linux/hugetlb_cgroup.h>
>   #include "internal.h"
> 
>   const unsigned long hugetlb_zero = 0, hugetlb_infinity = ~0UL;
> @@ -1916,6 +1917,13 @@ void __init hugetlb_add_hstate(unsigned order)
>   	h->next_nid_to_free = first_node(node_states[N_HIGH_MEMORY]);
>   	snprintf(h->name, HSTATE_NAME_LEN, "hugepages-%lukB",
>   					huge_page_size(h)/1024);
> +	/*
> +	 * Add cgroup control files only if the huge page consists
> +	 * of more than two normal pages. This is because we use
> +	 * page[2].lru.next for storing cgoup details.
> +	 */
> +	if (order>= 2)
> +		hugetlb_cgroup_file_init(hugetlb_max_hstate - 1);
> 

What happens at hugetlb module exit ? please see hugetlb_exit().

BTW, module unload of hugetlbfs is restricted if hugetlb cgroup is mounted ??

Thanks,
-Kame

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