linux-kernel - Re: [PATCH 08/18] mm, hugetlb: do hugepage_subpool_get_pages() when avoid

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Date:	Mon, 29 Jul 2013 14:05:51 -0400
From:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>,
	Michal Hocko <mhocko@...e.cz>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Hugh Dickins <hughd@...gle.com>,
	Davidlohr Bueso <davidlohr.bueso@...com>,
	David Gibson <david@...son.dropbear.id.au>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Joonsoo Kim <js1304@...il.com>,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>,
	Hillf Danton <dhillf@...il.com>
Subject: Re: [PATCH 08/18] mm, hugetlb: do hugepage_subpool_get_pages() when
 avoid_reserve

On Mon, Jul 29, 2013 at 02:31:59PM +0900, Joonsoo Kim wrote:
> When we try to get a huge page with avoid_reserve, we don't consume
> a reserved page. So it is treated like as non-reserve case.

This patch will be completely overwritten with 9/18.
So is this patch necessary?

Naoya Horiguchi

> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
> 
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index 1426c03..749629e 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -1149,12 +1149,13 @@ static struct page *alloc_huge_page(struct vm_area_struct *vma,
>  	if (has_reserve < 0)
>  		return ERR_PTR(-ENOMEM);
>  
> -	if (!has_reserve && (hugepage_subpool_get_pages(spool, 1) < 0))
> +	if ((!has_reserve || avoid_reserve)
> +		&& (hugepage_subpool_get_pages(spool, 1) < 0))
>  			return ERR_PTR(-ENOSPC);
>  
>  	ret = hugetlb_cgroup_charge_cgroup(idx, pages_per_huge_page(h), &h_cg);
>  	if (ret) {
> -		if (!has_reserve)
> +		if (!has_reserve || avoid_reserve)
>  			hugepage_subpool_put_pages(spool, 1);
>  		return ERR_PTR(-ENOSPC);
>  	}
> @@ -1167,7 +1168,7 @@ static struct page *alloc_huge_page(struct vm_area_struct *vma,
>  			hugetlb_cgroup_uncharge_cgroup(idx,
>  						       pages_per_huge_page(h),
>  						       h_cg);
> -			if (!has_reserve)
> +			if (!has_reserve || avoid_reserve)
>  				hugepage_subpool_put_pages(spool, 1);
>  			return ERR_PTR(-ENOSPC);
>  		}
> -- 
> 1.7.9.5
>
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