linux-kernel - Re: [patch v2] mm, hugetlb_cgroup: align hugetlb cgroup limit to hugepage size

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Date:	Sat, 09 Aug 2014 15:35:47 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Tejun Heo <tj@...nel.org>, Li Zefan <lizefan@...wei.com>,
	Michal Hocko <mhocko@...e.cz>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [patch v2] mm, hugetlb_cgroup: align hugetlb cgroup limit to hugepage size

David Rientjes <rientjes@...gle.com> writes:

> Memcg aligns memory.limit_in_bytes to PAGE_SIZE as part of the resource counter
> since it makes no sense to allow a partial page to be charged.
>
> As a result of the hugetlb cgroup using the resource counter, it is also aligned
> to PAGE_SIZE but makes no sense unless aligned to the size of the hugepage being
> limited.
>
> Align hugetlb cgroup limit to hugepage size.
>
> Acked-by: Michal Hocko <mhocko@...e.cz>
> Signed-off-by: David Rientjes <rientjes@...gle.com>

Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>

> ---
>  v2: use huge_page_order() per Aneesh
>      Sorry for not cc'ing you initially, get_maintainer.pl failed me
>
>  mm/hugetlb_cgroup.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/mm/hugetlb_cgroup.c b/mm/hugetlb_cgroup.c
> --- a/mm/hugetlb_cgroup.c
> +++ b/mm/hugetlb_cgroup.c
> @@ -275,6 +275,7 @@ static ssize_t hugetlb_cgroup_write(struct kernfs_open_file *of,
>  		ret = res_counter_memparse_write_strategy(buf, &val);
>  		if (ret)
>  			break;
> +		val = ALIGN(val, 1ULL << huge_page_shift(&hstates[idx]));

Do we really need ULL ? max value should fit in unsigned long right ?

>  		ret = res_counter_set_limit(&h_cg->hugepage[idx], val);
>  		break;
>  	default:

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