linux-kernel - Re: [PATCH v2 01/20] mm, hugetlb: protect reserved pages when soft offlining a hugepage

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Date:	Mon, 12 Aug 2013 06:20:58 -0700
From:	Davidlohr Bueso <davidlohr@...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>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Hillf Danton <dhillf@...il.com>
Subject: Re: [PATCH v2 01/20] mm, hugetlb: protect reserved pages when soft
 offlining a hugepage

On Fri, 2013-08-09 at 18:26 +0900, Joonsoo Kim wrote:
> Don't use the reserve pool when soft offlining a hugepage.
> Check we have free pages outside the reserve pool before we
> dequeue the huge page. Otherwise, we can steal other's reserve page.
> 
> Reviewed-by: Aneesh Kumar <aneesh.kumar@...ux.vnet.ibm.com>
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>

Reviewed-by: Davidlohr Bueso <davidlohr@...com>

> 
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index 6782b41..d971233 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -935,10 +935,11 @@ static struct page *alloc_buddy_huge_page(struct hstate *h, int nid)
>   */
>  struct page *alloc_huge_page_node(struct hstate *h, int nid)
>  {
> -	struct page *page;
> +	struct page *page = NULL;
>  
>  	spin_lock(&hugetlb_lock);
> -	page = dequeue_huge_page_node(h, nid);
> +	if (h->free_huge_pages - h->resv_huge_pages > 0)
> +		page = dequeue_huge_page_node(h, nid);
>  	spin_unlock(&hugetlb_lock);
>  
>  	if (!page)


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