linux-kernel - Re: [PATCH -V4 05/10] hugetlb: add charge/uncharge calls for HugeTLB alloc/free

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Date:	Mon, 19 Mar 2012 11:41:07 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.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 05/10] hugetlb: add charge/uncharge calls for HugeTLB
 alloc/free

(2012/03/17 2:39), Aneesh Kumar K.V wrote:

> From: "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
> 
> This adds necessary charge/uncharge calls in the HugeTLB code
> 
> Acked-by: Hillf Danton <dhillf@...il.com>
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>


Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
A nitpick below.

> ---
>  mm/hugetlb.c    |   21 ++++++++++++++++++++-
>  mm/memcontrol.c |    5 +++++
>  2 files changed, 25 insertions(+), 1 deletions(-)
> 
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index c672187..91361a0 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -21,6 +21,8 @@
>  #include <linux/rmap.h>
>  #include <linux/swap.h>
>  #include <linux/swapops.h>
> +#include <linux/memcontrol.h>
> +#include <linux/page_cgroup.h>
>  
>  #include <asm/page.h>
>  #include <asm/pgtable.h>
> @@ -542,6 +544,9 @@ static void free_huge_page(struct page *page)
>  	BUG_ON(page_mapcount(page));
>  	INIT_LIST_HEAD(&page->lru);
>  
> +	if (mapping)
> +		mem_cgroup_hugetlb_uncharge_page(hstate_index(h),
> +						 pages_per_huge_page(h), page);
>  	spin_lock(&hugetlb_lock);
>  	if (h->surplus_huge_pages_node[nid] && huge_page_order(h) < MAX_ORDER) {
>  		update_and_free_page(h, page);
> @@ -1019,12 +1024,15 @@ static void vma_commit_reservation(struct hstate *h,
>  static struct page *alloc_huge_page(struct vm_area_struct *vma,
>  				    unsigned long addr, int avoid_reserve)
>  {
> +	int ret, idx;
>  	struct hstate *h = hstate_vma(vma);
>  	struct page *page;
> +	struct mem_cgroup *memcg = NULL;


Can't we this initialization in mem_cgroup_hugetlb_charge_page() ?

Thanks,
-Kame

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