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Date: Tue, 20 Jun 2017 19:07:13 -0400
From: Zi Yan <zi.yan@...t.com>
To: kirill.shutemov@...ux.intel.com, linux-kernel@...r.kernel.org,
linux-mm@...ck.org
Cc: akpm@...ux-foundation.org, minchan@...nel.org, vbabka@...e.cz,
mgorman@...hsingularity.net, mhocko@...nel.org,
khandual@...ux.vnet.ibm.com, zi.yan@...rutgers.edu,
dnellans@...dia.com, dave.hansen@...el.com,
n-horiguchi@...jp.nec.com
Subject: [PATCH v7 08/10] mm: mempolicy: mbind and migrate_pages support thp migration
From: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
This patch enables thp migration for mbind(2) and migrate_pages(2).
ChangeLog v1 -> v2:
- support pte-mapped and doubly-mapped thp
Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
ChangeLog v2 -> v6:
- use the same gfp flag (GFP_TRANSHUGE) in mbind() and migrate_pages()
for thp allocations.
Signed-off-by: Zi Yan <zi.yan@...rutgers.edu>
---
mm/mempolicy.c | 108 +++++++++++++++++++++++++++++++++++++++++----------------
1 file changed, 79 insertions(+), 29 deletions(-)
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index a6160e9ce8dc..539144ec9c59 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -97,6 +97,7 @@
#include <linux/mm_inline.h>
#include <linux/mmu_notifier.h>
#include <linux/printk.h>
+#include <linux/swapops.h>
#include <asm/tlbflush.h>
#include <linux/uaccess.h>
@@ -426,6 +427,49 @@ static inline bool queue_pages_required(struct page *page,
return node_isset(nid, *qp->nmask) == !(flags & MPOL_MF_INVERT);
}
+static int queue_pages_pmd(pmd_t *pmd, spinlock_t *ptl, unsigned long addr,
+ unsigned long end, struct mm_walk *walk)
+{
+ int ret = 0;
+ struct page *page;
+ struct queue_pages *qp = walk->private;
+ unsigned long flags;
+
+ if (unlikely(is_pmd_migration_entry(*pmd))) {
+ ret = 1;
+ goto unlock;
+ }
+ page = pmd_page(*pmd);
+ if (is_huge_zero_page(page)) {
+ spin_unlock(ptl);
+ __split_huge_pmd(walk->vma, pmd, addr, false, NULL);
+ goto out;
+ }
+ if (!thp_migration_supported()) {
+ get_page(page);
+ spin_unlock(ptl);
+ lock_page(page);
+ ret = split_huge_page(page);
+ unlock_page(page);
+ put_page(page);
+ goto out;
+ }
+ if (!queue_pages_required(page, qp)) {
+ ret = 1;
+ goto unlock;
+ }
+
+ ret = 1;
+ flags = qp->flags;
+ /* go to thp migration */
+ if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL))
+ migrate_page_add(page, qp->pagelist, flags);
+unlock:
+ spin_unlock(ptl);
+out:
+ return ret;
+}
+
/*
* Scan through pages checking if pages follow certain conditions,
* and move them to the pagelist if they do.
@@ -437,30 +481,15 @@ static int queue_pages_pte_range(pmd_t *pmd, unsigned long addr,
struct page *page;
struct queue_pages *qp = walk->private;
unsigned long flags = qp->flags;
- int nid, ret;
+ int ret;
pte_t *pte;
spinlock_t *ptl;
- if (pmd_trans_huge(*pmd)) {
- ptl = pmd_lock(walk->mm, pmd);
- if (pmd_trans_huge(*pmd)) {
- page = pmd_page(*pmd);
- if (is_huge_zero_page(page)) {
- spin_unlock(ptl);
- __split_huge_pmd(vma, pmd, addr, false, NULL);
- } else {
- get_page(page);
- spin_unlock(ptl);
- lock_page(page);
- ret = split_huge_page(page);
- unlock_page(page);
- put_page(page);
- if (ret)
- return 0;
- }
- } else {
- spin_unlock(ptl);
- }
+ ptl = pmd_trans_huge_lock(pmd, vma);
+ if (ptl) {
+ ret = queue_pages_pmd(pmd, ptl, addr, end, walk);
+ if (ret)
+ return 0;
}
if (pmd_trans_unstable(pmd))
@@ -481,7 +510,7 @@ static int queue_pages_pte_range(pmd_t *pmd, unsigned long addr,
continue;
if (!queue_pages_required(page, qp))
continue;
- if (PageTransCompound(page)) {
+ if (PageTransCompound(page) && !thp_migration_supported()) {
get_page(page);
pte_unmap_unlock(pte, ptl);
lock_page(page);
@@ -898,19 +927,21 @@ static long do_get_mempolicy(int *policy, nodemask_t *nmask,
#ifdef CONFIG_MIGRATION
/*
- * page migration
+ * page migration, thp tail pages can be passed.
*/
static void migrate_page_add(struct page *page, struct list_head *pagelist,
unsigned long flags)
{
+ struct page *head = compound_head(page);
/*
* Avoid migrating a page that is shared with others.
*/
- if ((flags & MPOL_MF_MOVE_ALL) || page_mapcount(page) == 1) {
- if (!isolate_lru_page(page)) {
- list_add_tail(&page->lru, pagelist);
- inc_node_page_state(page, NR_ISOLATED_ANON +
- page_is_file_cache(page));
+ if ((flags & MPOL_MF_MOVE_ALL) || page_mapcount(head) == 1) {
+ if (!isolate_lru_page(head)) {
+ 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));
}
}
}
@@ -920,7 +951,17 @@ static struct page *new_node_page(struct page *page, unsigned long node, int **x
if (PageHuge(page))
return alloc_huge_page_node(page_hstate(compound_head(page)),
node);
- else
+ else if (thp_migration_supported() && PageTransHuge(page)) {
+ struct page *thp;
+
+ thp = alloc_pages_node(node,
+ (GFP_TRANSHUGE | __GFP_THISNODE),
+ HPAGE_PMD_ORDER);
+ if (!thp)
+ return NULL;
+ prep_transhuge_page(thp);
+ return thp;
+ } else
return __alloc_pages_node(node, GFP_HIGHUSER_MOVABLE |
__GFP_THISNODE, 0);
}
@@ -1086,6 +1127,15 @@ static struct page *new_page(struct page *page, unsigned long start, int **x)
if (PageHuge(page)) {
BUG_ON(!vma);
return alloc_huge_page_noerr(vma, address, 1);
+ } else if (thp_migration_supported() && PageTransHuge(page)) {
+ struct page *thp;
+
+ thp = alloc_hugepage_vma(GFP_TRANSHUGE, vma, address,
+ HPAGE_PMD_ORDER);
+ if (!thp)
+ return NULL;
+ prep_transhuge_page(thp);
+ return thp;
}
/*
* if !vma, alloc_page_vma() will use task or system default policy
--
2.11.0
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