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Date: Fri, 22 Mar 2013 16:23:50 -0400
From: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To: linux-mm@...ck.org
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Mel Gorman <mel@....ul.ie>, Hugh Dickins <hughd@...gle.com>,
KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
Andi Kleen <andi@...stfloor.org>,
Hillf Danton <dhillf@...il.com>, Michal Hocko <mhocko@...e.cz>,
linux-kernel@...r.kernel.org
Subject: [PATCH 05/10] migrate: add hugepage migration code to migrate_pages()
This patch extends check_range() to handle vma with VM_HUGETLB set.
We will be able to migrate hugepage with migrate_pages(2) after
applying the enablement patch which comes later in this series.
Note that for larger hugepages (covered by pud entries, 1GB for
x86_64 for example), we simply skip it now.
ChangeLog v2:
- remove unnecessary extern
- fix page table lock in check_hugetlb_pmd_range
- updated description and renamed patch title
Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
---
include/linux/hugetlb.h | 2 ++
mm/hugetlb.c | 10 ++++++++++
mm/mempolicy.c | 46 ++++++++++++++++++++++++++++++++++------------
3 files changed, 46 insertions(+), 12 deletions(-)
diff --git v3.9-rc3.orig/include/linux/hugetlb.h v3.9-rc3/include/linux/hugetlb.h
index baa0aa0..3c62b82 100644
--- v3.9-rc3.orig/include/linux/hugetlb.h
+++ v3.9-rc3/include/linux/hugetlb.h
@@ -68,6 +68,7 @@ void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
int dequeue_hwpoisoned_huge_page(struct page *page);
void putback_active_hugepage(struct page *page);
void putback_active_hugepages(struct list_head *l);
+void migrate_hugepage_add(struct page *page, struct list_head *list);
void copy_huge_page(struct page *dst, struct page *src);
extern unsigned long hugepages_treat_as_movable;
@@ -132,6 +133,7 @@ static inline int dequeue_hwpoisoned_huge_page(struct page *page)
#define putback_active_hugepage(p) 0
#define putback_active_hugepages(l) 0
+#define migrate_hugepage_add(p, l) 0
static inline void copy_huge_page(struct page *dst, struct page *src)
{
}
diff --git v3.9-rc3.orig/mm/hugetlb.c v3.9-rc3/mm/hugetlb.c
index a787c44..99ef969 100644
--- v3.9-rc3.orig/mm/hugetlb.c
+++ v3.9-rc3/mm/hugetlb.c
@@ -3201,3 +3201,13 @@ void putback_active_hugepages(struct list_head *l)
list_for_each_entry_safe(page, page2, l, lru)
putback_active_hugepage(page);
}
+
+void migrate_hugepage_add(struct page *page, struct list_head *list)
+{
+ VM_BUG_ON(!PageHead(page));
+ get_page(page);
+ spin_lock(&hugetlb_lock);
+ list_move_tail(&page->lru, list);
+ spin_unlock(&hugetlb_lock);
+ return;
+}
diff --git v3.9-rc3.orig/mm/mempolicy.c v3.9-rc3/mm/mempolicy.c
index 7431001..b9e323e 100644
--- v3.9-rc3.orig/mm/mempolicy.c
+++ v3.9-rc3/mm/mempolicy.c
@@ -512,6 +512,27 @@ static int check_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
return addr != end;
}
+static void check_hugetlb_pmd_range(struct vm_area_struct *vma, pmd_t *pmd,
+ const nodemask_t *nodes, unsigned long flags,
+ void *private)
+{
+#ifdef CONFIG_HUGETLB_PAGE
+ int nid;
+ struct page *page;
+
+ spin_lock(&vma->vm_mm->page_table_lock);
+ page = pte_page(huge_ptep_get((pte_t *)pmd));
+ nid = page_to_nid(page);
+ if (node_isset(nid, *nodes) != !!(flags & MPOL_MF_INVERT)
+ && ((flags & MPOL_MF_MOVE && page_mapcount(page) == 1)
+ || flags & MPOL_MF_MOVE_ALL))
+ migrate_hugepage_add(page, private);
+ spin_unlock(&vma->vm_mm->page_table_lock);
+#else
+ BUG();
+#endif
+}
+
static inline int check_pmd_range(struct vm_area_struct *vma, pud_t *pud,
unsigned long addr, unsigned long end,
const nodemask_t *nodes, unsigned long flags,
@@ -523,6 +544,11 @@ static inline int check_pmd_range(struct vm_area_struct *vma, pud_t *pud,
pmd = pmd_offset(pud, addr);
do {
next = pmd_addr_end(addr, end);
+ if (pmd_huge(*pmd) && is_vm_hugetlb_page(vma)) {
+ check_hugetlb_pmd_range(vma, pmd, nodes,
+ flags, private);
+ continue;
+ }
split_huge_page_pmd(vma, addr, pmd);
if (pmd_none_or_trans_huge_or_clear_bad(pmd))
continue;
@@ -544,6 +570,8 @@ static inline int check_pud_range(struct vm_area_struct *vma, pgd_t *pgd,
pud = pud_offset(pgd, addr);
do {
next = pud_addr_end(addr, end);
+ if (pud_huge(*pud) && is_vm_hugetlb_page(vma))
+ continue;
if (pud_none_or_clear_bad(pud))
continue;
if (check_pmd_range(vma, pud, addr, next, nodes,
@@ -635,9 +663,6 @@ check_range(struct mm_struct *mm, unsigned long start, unsigned long end,
return ERR_PTR(-EFAULT);
}
- if (is_vm_hugetlb_page(vma))
- goto next;
-
if (flags & MPOL_MF_LAZY) {
change_prot_numa(vma, start, endvma);
goto next;
@@ -986,7 +1011,11 @@ static void migrate_page_add(struct page *page, struct list_head *pagelist,
static struct page *new_node_page(struct page *page, unsigned long node, int **x)
{
- return alloc_pages_exact_node(node, GFP_HIGHUSER_MOVABLE, 0);
+ if (PageHuge(page))
+ return alloc_huge_page_node(page_hstate(compound_head(page)),
+ node);
+ else
+ return alloc_pages_exact_node(node, GFP_HIGHUSER_MOVABLE, 0);
}
/*
@@ -998,7 +1027,6 @@ static int migrate_to_node(struct mm_struct *mm, int source, int dest,
{
nodemask_t nmask;
LIST_HEAD(pagelist);
- int err = 0;
nodes_clear(nmask);
node_set(source, nmask);
@@ -1012,14 +1040,8 @@ static int migrate_to_node(struct mm_struct *mm, int source, int dest,
check_range(mm, mm->mmap->vm_start, mm->task_size, &nmask,
flags | MPOL_MF_DISCONTIG_OK, &pagelist);
- if (!list_empty(&pagelist)) {
- err = migrate_pages(&pagelist, new_node_page, dest,
+ return migrate_movable_pages(&pagelist, new_node_page, dest,
MIGRATE_SYNC, MR_SYSCALL);
- if (err)
- putback_lru_pages(&pagelist);
- }
-
- return err;
}
/*
--
1.7.11.7
--
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