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[PATCH 3/3] mm, hugetlb, soft_offline: use new_page_nodemask for soft offline migration

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  [PATCH 3/3] mm, hugetlb, soft_offline: use new_page_nodemask for soft offline migration Michal Hocko <mhocko@kernel.org> - 2017-06-22 21:40 +0200
    Re: [PATCH 3/3] mm, hugetlb, soft_offline: use new_page_nodemask for  soft offline migration Mike Kravetz <mike.kravetz@oracle.com> - 2017-06-26 20:40 +0200

#1672999 — [PATCH 3/3] mm, hugetlb, soft_offline: use new_page_nodemask for soft offline migration

From: Michal Hocko <mhocko@suse.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@suse.cz>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Michal Hocko <mhocko@suse.com>
---
 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]);
 }
 
 /*
-- 
2.11.0

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#1675000 — Re: [PATCH 3/3] mm, hugetlb, soft_offline: use new_page_nodemask for soft offline migration

On 06/22/2017 12:30 PM, Michal Hocko wrote:
> From: Michal Hocko <mhocko@suse.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.

Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Tested-by: Mike Kravetz <mike.kravetz@oracle.com>

-- 
Mike Kravetz

> 
> Noticed-by: Vlastimil Babka <vbabka@suse.cz>
> Acked-by: Vlastimil Babka <vbabka@suse.cz>
> Signed-off-by: Michal Hocko <mhocko@suse.com>
> ---
>  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]);
>  }
>  
>  /*
> 

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