This patch enables thp migration for move_pages(2).
Signed-off-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
---
mm/migrate.c | 37 ++++++++++++++++++++++++++++---------
1 file changed, 28 insertions(+), 9 deletions(-)
diff --git v4.9-rc2-mmotm-2016-10-27-18-27/mm/migrate.c v4.9-rc2-mmotm-2016-10-27-18-27_patched/mm/migrate.c
index 97ab8d9..6a589b9 100644
--- v4.9-rc2-mmotm-2016-10-27-18-27/mm/migrate.c
+++ v4.9-rc2-mmotm-2016-10-27-18-27_patched/mm/migrate.c
@@ -1443,7 +1443,17 @@ static struct page *new_page_node(struct page *p, unsigned long private,
if (PageHuge(p))
return alloc_huge_page_node(page_hstate(compound_head(p)),
pm->node);
- else
+ else if (thp_migration_supported() && PageTransHuge(p)) {
+ struct page *thp;
+
+ thp = alloc_pages_node(pm->node,
+ (GFP_TRANSHUGE | __GFP_THISNODE) & ~__GFP_RECLAIM,
+ HPAGE_PMD_ORDER);
+ if (!thp)
+ return NULL;
+ prep_transhuge_page(thp);
+ return thp;
+ } else
return __alloc_pages_node(pm->node,
GFP_HIGHUSER_MOVABLE | __GFP_THISNODE, 0);
}
@@ -1470,6 +1480,8 @@ static int do_move_page_to_node_array(struct mm_struct *mm,
for (pp = pm; pp->node != MAX_NUMNODES; pp++) {
struct vm_area_struct *vma;
struct page *page;
+ struct page *head;
+ unsigned int follflags;
err = -EFAULT;
vma = find_vma(mm, pp->addr);
@@ -1477,8 +1489,10 @@ static int do_move_page_to_node_array(struct mm_struct *mm,
goto set_status;
/* FOLL_DUMP to ignore special (like zero) pages */
- page = follow_page(vma, pp->addr,
- FOLL_GET | FOLL_SPLIT | FOLL_DUMP);
+ follflags = FOLL_GET | FOLL_SPLIT | FOLL_DUMP;
+ if (thp_migration_supported())
+ follflags &= ~FOLL_SPLIT;
+ page = follow_page(vma, pp->addr, follflags);
err = PTR_ERR(page);
if (IS_ERR(page))
@@ -1488,7 +1502,6 @@ static int do_move_page_to_node_array(struct mm_struct *mm,
if (!page)
goto set_status;
- pp->page = page;
err = page_to_nid(page);
if (err == pp->node)
@@ -1503,16 +1516,22 @@ static int do_move_page_to_node_array(struct mm_struct *mm,
goto put_and_set;
if (PageHuge(page)) {
- if (PageHead(page))
+ if (PageHead(page)) {
isolate_huge_page(page, &pagelist);
+ err = 0;
+ pp->page = page;
+ }
goto put_and_set;
}
- err = isolate_lru_page(page);
+ pp->page = compound_head(page);
+ head = compound_head(page);
+ err = isolate_lru_page(head);
if (!err) {
- list_add_tail(&page->lru, &pagelist);
- inc_node_page_state(page, NR_ISOLATED_ANON +
- page_is_file_cache(page));
+ list_add_tail(&head->lru, &pagelist);
+ mod_node_page_state(page_pgdat(head),
+ NR_ISOLATED_ANON + page_is_file_cache(head),
+ hpage_nr_pages(head));
}
put_and_set:
/*
--
2.7.0
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