linux-kernel - Re: [RFC PATCH 4/4] mm, hugetlb, soft_offline: use new_page

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Message-ID: <1fdaa94e-33a7-f280-d682-1ffb0b8547db@suse.cz>
Date:   Wed, 14 Jun 2017 18:22:21 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Michal Hocko <mhocko@...nel.org>, linux-mm@...ck.org
Cc:     Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Mel Gorman <mgorman@...e.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Michal Hocko <mhocko@...e.com>
Subject: Re: [RFC PATCH 4/4] mm, hugetlb, soft_offline: use new_page_nodemask
 for soft offline migration

On 06/13/2017 11:00 AM, Michal Hocko wrote:
> From: Michal Hocko <mhocko@...e.com>
> 
> new_page is yet another duplication of the migration callback which has
> to handle hugetlb migration specially. We can safely use the generic
> new_page_nodemask for the same purpose.
> 
> Please note that gigantic hugetlb pages do not need any special handling
> because alloc_huge_page_nodemask will make sure to check pages in all
> per node pools. The reason this was done previously was that
> alloc_huge_page_node treated NO_NUMA_NODE and a specific node
> differently and so alloc_huge_page_node(nid) would check on this
> specific node.
> 
> Noticed-by: Vlastimil Babka <vbabka@...e.cz>
> Signed-off-by: Michal Hocko <mhocko@...e.com>

Acked-by: Vlastimil Babka <vbabka@...e.cz>

> ---
>  mm/memory-failure.c | 10 +---------
>  1 file changed, 1 insertion(+), 9 deletions(-)
> 
> diff --git a/mm/memory-failure.c b/mm/memory-failure.c
> index 3615bffbd269..7040f60ecb71 100644
> --- a/mm/memory-failure.c
> +++ b/mm/memory-failure.c
> @@ -1487,16 +1487,8 @@ EXPORT_SYMBOL(unpoison_memory);
>  static struct page *new_page(struct page *p, unsigned long private, int **x)
>  {
>  	int nid = page_to_nid(p);
> -	if (PageHuge(p)) {
> -		struct hstate *hstate = page_hstate(compound_head(p));
>  
> -		if (hstate_is_gigantic(hstate))
> -			return alloc_huge_page_node(hstate, NUMA_NO_NODE);
> -
> -		return alloc_huge_page_node(hstate, nid);
> -	} else {
> -		return __alloc_pages_node(nid, GFP_HIGHUSER_MOVABLE, 0);
> -	}
> +	return new_page_nodemask(p, nid, &node_states[N_MEMORY]);
>  }
>  
>  /*
>