[PATCH 04/11] mm/hugetlb: unify hugetlb migration callback function

[js1304@xxxxxxxxx]

From: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>

There is no difference between two migration callback functions,
alloc_huge_page_node() and alloc_huge_page_nodemask(), except
__GFP_THISNODE handling. This patch adds one more field on to
the alloc_control and handles this exception.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
---
 include/linux/hugetlb.h |  8 --------
 mm/hugetlb.c            | 23 ++---------------------
 mm/internal.h           |  1 +
 mm/mempolicy.c          |  3 ++-
 4 files changed, 5 insertions(+), 30 deletions(-)

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 6da217e..4892ed3 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -505,8 +505,6 @@ struct huge_bootmem_page {
 
 struct page *alloc_migrate_huge_page(struct hstate *h,
 				struct alloc_control *ac);
-struct page *alloc_huge_page_node(struct hstate *h,
-				struct alloc_control *ac);
 struct page *alloc_huge_page_nodemask(struct hstate *h,
 				struct alloc_control *ac);
 struct page *alloc_huge_page_vma(struct hstate *h, struct vm_area_struct *vma,
@@ -755,12 +753,6 @@ static inline void huge_ptep_modify_prot_commit(struct vm_area_struct *vma,
 struct hstate {};
 
 static inline struct page *
-alloc_huge_page_node(struct hstate *h, struct alloc_control *ac)
-{
-	return NULL;
-}
-
-static inline struct page *
 alloc_huge_page_nodemask(struct hstate *h, struct alloc_control *ac)
 {
 	return NULL;
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 859dba4..60b0983 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1981,31 +1981,12 @@ struct page *alloc_buddy_huge_page_with_mpol(struct hstate *h,
 }
 
 /* page migration callback function */
-struct page *alloc_huge_page_node(struct hstate *h,
-				struct alloc_control *ac)
-{
-	struct page *page = NULL;
-
-	ac->gfp_mask |= htlb_alloc_mask(h);
-	if (ac->nid != NUMA_NO_NODE)
-		ac->gfp_mask |= __GFP_THISNODE;
-
-	spin_lock(&hugetlb_lock);
-	if (h->free_huge_pages - h->resv_huge_pages > 0)
-		page = dequeue_huge_page_nodemask(h, ac);
-	spin_unlock(&hugetlb_lock);
-
-	if (!page)
-		page = alloc_migrate_huge_page(h, ac);
-
-	return page;
-}
-
-/* page migration callback function */
 struct page *alloc_huge_page_nodemask(struct hstate *h,
 				struct alloc_control *ac)
 {
 	ac->gfp_mask |= htlb_alloc_mask(h);
+	if (ac->thisnode && ac->nid != NUMA_NO_NODE)
+		ac->gfp_mask |= __GFP_THISNODE;
 
 	spin_lock(&hugetlb_lock);
 	if (h->free_huge_pages - h->resv_huge_pages > 0) {
diff --git a/mm/internal.h b/mm/internal.h
index 75b3f8e..574722d0 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -618,6 +618,7 @@ struct alloc_control {
 	int nid;
 	nodemask_t *nmask;
 	gfp_t gfp_mask;
+	bool thisnode;
 };
 
 #endif	/* __MM_INTERNAL_H */
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 06f60a5..629feaa 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1073,9 +1073,10 @@ struct page *alloc_new_node_page(struct page *page, unsigned long node)
 		struct alloc_control ac = {
 			.nid = node,
 			.nmask = NULL,
+			.thisnode = true,
 		};
 
-		return alloc_huge_page_node(h, &ac);
+		return alloc_huge_page_nodemask(h, &ac);
 	} else if (PageTransHuge(page)) {
 		struct page *thp;
 
-- 
2.7.4