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Subject[PATCH v5 11/11] mm: memory_hotplug: memory hotremove supports thp migration
Date
From: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>

This patch enables thp migration for memory hotremove.

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
---
ChangeLog v1->v2:
- base code switched from alloc_migrate_target to new_node_page()
---
include/linux/huge_mm.h | 8 ++++++++
mm/memory_hotplug.c | 17 ++++++++++++++---
2 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 6f44a2352597..92c2161704c3 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -189,6 +189,13 @@ static inline int hpage_nr_pages(struct page *page)
return 1;
}

+static inline int hpage_order(struct page *page)
+{
+ if (unlikely(PageTransHuge(page)))
+ return HPAGE_PMD_ORDER;
+ return 0;
+}
+
struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr,
pmd_t *pmd, int flags);
struct page *follow_devmap_pud(struct vm_area_struct *vma, unsigned long addr,
@@ -233,6 +240,7 @@ static inline bool thp_migration_supported(void)
#define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })

#define hpage_nr_pages(x) 1
+#define hpage_order(x) 0

#define transparent_hugepage_enabled(__vma) 0

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 257166ebdff0..ecae0852994f 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1574,6 +1574,7 @@ static struct page *new_node_page(struct page *page, unsigned long private,
int nid = page_to_nid(page);
nodemask_t nmask = node_states[N_MEMORY];
struct page *new_page = NULL;
+ unsigned int order = 0;

/*
* TODO: allocate a destination hugepage from a nearest neighbor node,
@@ -1584,6 +1585,11 @@ static struct page *new_node_page(struct page *page, unsigned long private,
return alloc_huge_page_node(page_hstate(compound_head(page)),
next_node_in(nid, nmask));

+ if (thp_migration_supported() && PageTransHuge(page)) {
+ order = hpage_order(page);
+ gfp_mask |= GFP_TRANSHUGE;
+ }
+
node_clear(nid, nmask);

if (PageHighMem(page)
@@ -1591,12 +1597,15 @@ static struct page *new_node_page(struct page *page, unsigned long private,
gfp_mask |= __GFP_HIGHMEM;

if (!nodes_empty(nmask))
- new_page = __alloc_pages_nodemask(gfp_mask, 0,
+ new_page = __alloc_pages_nodemask(gfp_mask, order,
node_zonelist(nid, gfp_mask), &nmask);
if (!new_page)
- new_page = __alloc_pages(gfp_mask, 0,
+ new_page = __alloc_pages(gfp_mask, order,
node_zonelist(nid, gfp_mask));

+ if (new_page && order == hpage_order(page))
+ prep_transhuge_page(new_page);
+
return new_page;
}

@@ -1626,7 +1635,9 @@ do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
if (isolate_huge_page(page, &source))
move_pages -= 1 << compound_order(head);
continue;
- }
+ } else if (thp_migration_supported() && PageTransHuge(page))
+ pfn = page_to_pfn(compound_head(page))
+ + hpage_nr_pages(page) - 1;

if (!get_page_unless_zero(page))
continue;
--
2.11.0
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