mm/hugetlb: unify migration callbacks

There is no difference between two migration callback functions,
alloc_huge_page_node() and alloc_huge_page_nodemask(), except
__GFP_THISNODE handling.  It's redundant to have two almost similar
functions in order to handle this flag.  So, this patch tries to remove
one by introducing a new argument, gfp_mask, to
alloc_huge_page_nodemask().

After introducing gfp_mask argument, it's caller's job to provide correct
gfp_mask.  So, every callsites for alloc_huge_page_nodemask() are changed
to provide gfp_mask.

Note that it's safe to remove a node id check in alloc_huge_page_node()
since there is no caller passing NUMA_NO_NODE as a node id.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Roman Gushchin <guro@fb.com>
Link: http://lkml.kernel.org/r/1594622517-20681-4-git-send-email-iamjoonsoo.kim@lge.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index a520bf2..3517edd 100644 (file)
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -10,6 +10,7 @@
 #include <linux/list.h>
 #include <linux/kref.h>
 #include <linux/pgtable.h>
+#include <linux/gfp.h>
 
 struct ctl_table;
 struct user_struct;
@@ -506,9 +507,8 @@ struct huge_bootmem_page {
 
 struct page *alloc_huge_page(struct vm_area_struct *vma,
                                unsigned long addr, int avoid_reserve);
-struct page *alloc_huge_page_node(struct hstate *h, int nid);
 struct page *alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
-                               nodemask_t *nmask);
+                               nodemask_t *nmask, gfp_t gfp_mask);
 struct page *alloc_huge_page_vma(struct hstate *h, struct vm_area_struct *vma,
                                unsigned long address);
 struct page *alloc_migrate_huge_page(struct hstate *h, gfp_t gfp_mask,
@@ -694,6 +694,15 @@ static inline bool hugepage_movable_supported(struct hstate *h)
        return true;
 }
 
+/* Movability of hugepages depends on migration support. */
+static inline gfp_t htlb_alloc_mask(struct hstate *h)
+{
+       if (hugepage_movable_supported(h))
+               return GFP_HIGHUSER_MOVABLE;
+       else
+               return GFP_HIGHUSER;
+}
+
 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
                                           struct mm_struct *mm, pte_t *pte)
 {
@@ -761,13 +770,9 @@ static inline struct page *alloc_huge_page(struct vm_area_struct *vma,
        return NULL;
 }
 
-static inline struct page *alloc_huge_page_node(struct hstate *h, int nid)
-{
-       return NULL;
-}
-
 static inline struct page *
-alloc_huge_page_nodemask(struct hstate *h, int preferred_nid, nodemask_t *nmask)
+alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
+                       nodemask_t *nmask, gfp_t gfp_mask)
 {
        return NULL;
 }
@@ -880,6 +885,11 @@ static inline bool hugepage_movable_supported(struct hstate *h)
        return false;
 }
 
+static inline gfp_t htlb_alloc_mask(struct hstate *h)
+{
+       return 0;
+}
+
 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
                                           struct mm_struct *mm, pte_t *pte)
 {

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index b66bf74..eaab9ef 100644 (file)
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1093,15 +1093,6 @@ retry_cpuset:
        return NULL;
 }
 
-/* Movability of hugepages depends on migration support. */
-static inline gfp_t htlb_alloc_mask(struct hstate *h)
-{
-       if (hugepage_movable_supported(h))
-               return GFP_HIGHUSER_MOVABLE;
-       else
-               return GFP_HIGHUSER;
-}
-
 static struct page *dequeue_huge_page_vma(struct hstate *h,
                                struct vm_area_struct *vma,
                                unsigned long address, int avoid_reserve,
@@ -1985,32 +1976,10 @@ struct page *alloc_buddy_huge_page_with_mpol(struct hstate *h,
        return page;
 }
 
-/* page migration callback function */
-struct page *alloc_huge_page_node(struct hstate *h, int nid)
-{
-       gfp_t gfp_mask = htlb_alloc_mask(h);
-       struct page *page = NULL;
-
-       if (nid != NUMA_NO_NODE)
-               gfp_mask |= __GFP_THISNODE;
-
-       spin_lock(&hugetlb_lock);
-       if (h->free_huge_pages - h->resv_huge_pages > 0)
-               page = dequeue_huge_page_nodemask(h, gfp_mask, nid, NULL);
-       spin_unlock(&hugetlb_lock);
-
-       if (!page)
-               page = alloc_migrate_huge_page(h, gfp_mask, nid, NULL);
-
-       return page;
-}
-
 /* page migration callback function */
 struct page *alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
-               nodemask_t *nmask)
+               nodemask_t *nmask, gfp_t gfp_mask)
 {
-       gfp_t gfp_mask = htlb_alloc_mask(h);
-
        spin_lock(&hugetlb_lock);
        if (h->free_huge_pages - h->resv_huge_pages > 0) {
                struct page *page;
@@ -2038,7 +2007,7 @@ struct page *alloc_huge_page_vma(struct hstate *h, struct vm_area_struct *vma,
 
        gfp_mask = htlb_alloc_mask(h);
        node = huge_node(vma, address, gfp_mask, &mpol, &nodemask);
-       page = alloc_huge_page_nodemask(h, node, nodemask);
+       page = alloc_huge_page_nodemask(h, node, nodemask, gfp_mask);
        mpol_cond_put(mpol);
 
        return page;

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 25b7e41..9ae2b70 100644 (file)
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1068,10 +1068,12 @@ static int migrate_page_add(struct page *page, struct list_head *pagelist,
 /* page allocation callback for NUMA node migration */
 struct page *alloc_new_node_page(struct page *page, unsigned long node)
 {
-       if (PageHuge(page))
-               return alloc_huge_page_node(page_hstate(compound_head(page)),
-                                       node);
-       else if (PageTransHuge(page)) {
+       if (PageHuge(page)) {
+               struct hstate *h = page_hstate(compound_head(page));
+               gfp_t gfp_mask = htlb_alloc_mask(h) | __GFP_THISNODE;
+
+               return alloc_huge_page_nodemask(h, node, NULL, gfp_mask);
+       } else if (PageTransHuge(page)) {
                struct page *thp;
 
                thp = alloc_pages_node(node,

diff --git a/mm/migrate.c b/mm/migrate.c
index 5269bc5..8d084e9 100644 (file)
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1545,10 +1545,13 @@ struct page *new_page_nodemask(struct page *page,
        unsigned int order = 0;
        struct page *new_page = NULL;
 
-       if (PageHuge(page))
-               return alloc_huge_page_nodemask(
-                               page_hstate(compound_head(page)),
-                               preferred_nid, nodemask);
+       if (PageHuge(page)) {
+               struct hstate *h = page_hstate(compound_head(page));
+
+               gfp_mask = htlb_alloc_mask(h);
+               return alloc_huge_page_nodemask(h, preferred_nid,
+                                               nodemask, gfp_mask);
+       }
 
        if (PageTransHuge(page)) {
                gfp_mask |= GFP_TRANSHUGE;