linux-kernel - [PATCH 3/6] mm: migrate: teach migrate_misplaced

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Date:   Mon, 29 Mar 2021 11:33:09 -0700
From:   Yang Shi <shy828301@...il.com>
To:     mgorman@...e.de, kirill.shutemov@...ux.intel.com, ziy@...dia.com,
        mhocko@...e.com, ying.huang@...el.com, hughd@...gle.com,
        hca@...ux.ibm.com, gor@...ux.ibm.com, borntraeger@...ibm.com,
        akpm@...ux-foundation.org
Cc:     shy828301@...il.com, linux-mm@...ck.org,
        linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/6] mm: migrate: teach migrate_misplaced_page() about THP

In the following patch the migrate_misplaced_page() will be used to migrate THP
for NUMA faul too.  Prepare to deal with THP.

Signed-off-by: Yang Shi <shy828301@...il.com>
---
 include/linux/migrate.h | 6 ++++--
 mm/memory.c             | 2 +-
 mm/migrate.c            | 2 +-
 3 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/include/linux/migrate.h b/include/linux/migrate.h
index 3a389633b68f..6abd34986cc5 100644
--- a/include/linux/migrate.h
+++ b/include/linux/migrate.h
@@ -102,14 +102,16 @@ static inline void __ClearPageMovable(struct page *page)
 #ifdef CONFIG_NUMA_BALANCING
 extern bool pmd_trans_migrating(pmd_t pmd);
 extern int migrate_misplaced_page(struct page *page,
-				  struct vm_area_struct *vma, int node);
+				  struct vm_area_struct *vma, int node,
+				  bool compound);
 #else
 static inline bool pmd_trans_migrating(pmd_t pmd)
 {
 	return false;
 }
 static inline int migrate_misplaced_page(struct page *page,
-					 struct vm_area_struct *vma, int node)
+					 struct vm_area_struct *vma, int node,
+					 bool compound)
 {
 	return -EAGAIN; /* can't migrate now */
 }
diff --git a/mm/memory.c b/mm/memory.c
index 003bbf3187d4..7fed578bdc31 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -4169,7 +4169,7 @@ static vm_fault_t do_numa_page(struct vm_fault *vmf)
 	}
 
 	/* Migrate to the requested node */
-	migrated = migrate_misplaced_page(page, vma, target_nid);
+	migrated = migrate_misplaced_page(page, vma, target_nid, false);
 	if (migrated) {
 		page_nid = target_nid;
 		flags |= TNF_MIGRATED;
diff --git a/mm/migrate.c b/mm/migrate.c
index 62b81d5257aa..9c4ae5132919 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -2127,7 +2127,7 @@ static inline bool is_shared_exec_page(struct vm_area_struct *vma,
  * the page that will be dropped by this function before returning.
  */
 int migrate_misplaced_page(struct page *page, struct vm_area_struct *vma,
-			   int node)
+			   int node, bool compound)
 {
 	pg_data_t *pgdat = NODE_DATA(node);
 	int isolated;
-- 
2.26.2