1 files changed, 16 insertions, 7 deletions

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 7b09fe75799c..0ad946974df4 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1305,13 +1305,14 @@ int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
         if (current_nid == numa_node_id())
                 count_vm_numa_event(NUMA_HINT_FAULTS_LOCAL);
 
-        target_nid = mpol_misplaced(page, vma, haddr);
-        if (target_nid == -1) {
-                put_page(page);
-                goto clear_pmdnuma;
-        }
+        /*
+         * Acquire the page lock to serialise THP migrations but avoid dropping
+         * page_table_lock if at all possible
+         */
+        if (trylock_page(page))
+                goto got_lock;
 
-        /* Acquire the page lock to serialise THP migrations */
+        /* Serialise against migrationa and check placement check placement */
         spin_unlock(&mm->page_table_lock);
         lock_page(page);
 
@@ -1322,9 +1323,17 @@ int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
                 put_page(page);
                 goto out_unlock;
         }
-        spin_unlock(&mm->page_table_lock);
+
+got_lock:
+        target_nid = mpol_misplaced(page, vma, haddr);
+        if (target_nid == -1) {
+                unlock_page(page);
+                put_page(page);
+                goto clear_pmdnuma;
+        }
 
         /* Migrate the THP to the requested node */
+        spin_unlock(&mm->page_table_lock);
         migrated = migrate_misplaced_transhuge_page(mm, vma,
                                 pmdp, pmd, addr, page, target_nid);
         if (!migrated)