1 files changed, 55 insertions, 11 deletions

diff --git a/mm/rmap.c b/mm/rmap.c
index d24e2c36372e..c6bb2339e35b 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -798,6 +798,7 @@ struct folio_referenced_arg {
 	unsigned long vm_flags;
 	struct mem_cgroup *memcg;
 };
+
 /*
  * arg: folio_referenced_arg will be passed
  */
@@ -807,17 +808,33 @@ static bool folio_referenced_one(struct folio *folio,
 	struct folio_referenced_arg *pra = arg;
 	DEFINE_FOLIO_VMA_WALK(pvmw, folio, vma, address, 0);
 	int referenced = 0;
+	unsigned long start = address, ptes = 0;
 
 	while (page_vma_mapped_walk(&pvmw)) {
 		address = pvmw.address;
 
-		if ((vma->vm_flags & VM_LOCKED) &&
-		    (!folio_test_large(folio) || !pvmw.pte)) {
-			/* Restore the mlock which got missed */
-			mlock_vma_folio(folio, vma, !pvmw.pte);
-			page_vma_mapped_walk_done(&pvmw);
-			pra->vm_flags |= VM_LOCKED;
-			return false; /* To break the loop */
+		if (vma->vm_flags & VM_LOCKED) {
+			if (!folio_test_large(folio) || !pvmw.pte) {
+				/* Restore the mlock which got missed */
+				mlock_vma_folio(folio, vma);
+				page_vma_mapped_walk_done(&pvmw);
+				pra->vm_flags |= VM_LOCKED;
+				return false; /* To break the loop */
+			}
+			/*
+			 * For large folio fully mapped to VMA, will
+			 * be handled after the pvmw loop.
+			 *
+			 * For large folio cross VMA boundaries, it's
+			 * expected to be picked  by page reclaim. But
+			 * should skip reference of pages which are in
+			 * the range of VM_LOCKED vma. As page reclaim
+			 * should just count the reference of pages out
+			 * the range of VM_LOCKED vma.
+			 */
+			ptes++;
+			pra->mapcount--;
+			continue;
 		}
 
 		if (pvmw.pte) {
@@ -842,6 +859,23 @@ static bool folio_referenced_one(struct folio *folio,
 		pra->mapcount--;
 	}
 
+	if ((vma->vm_flags & VM_LOCKED) &&
+			folio_test_large(folio) &&
+			folio_within_vma(folio, vma)) {
+		unsigned long s_align, e_align;
+
+		s_align = ALIGN_DOWN(start, PMD_SIZE);
+		e_align = ALIGN_DOWN(start + folio_size(folio) - 1, PMD_SIZE);
+
+		/* folio doesn't cross page table boundary and fully mapped */
+		if ((s_align == e_align) && (ptes == folio_nr_pages(folio))) {
+			/* Restore the mlock which got missed */
+			mlock_vma_folio(folio, vma);
+			pra->vm_flags |= VM_LOCKED;
+			return false; /* To break the loop */
+		}
+	}
+
 	if (referenced)
 		folio_clear_idle(folio);
 	if (folio_test_clear_young(folio))
@@ -1254,7 +1288,14 @@ void page_add_anon_rmap(struct page *page, struct vm_area_struct *vma,
 			  (folio_test_large(folio) && folio_entire_mapcount(folio) > 1)) &&
 			 PageAnonExclusive(page), folio);
 
-	mlock_vma_folio(folio, vma, compound);
+	/*
+	 * For large folio, only mlock it if it's fully mapped to VMA. It's
+	 * not easy to check whether the large folio is fully mapped to VMA
+	 * here. Only mlock normal 4K folio and leave page reclaim to handle
+	 * large folio.
+	 */
+	if (!folio_test_large(folio))
+		mlock_vma_folio(folio, vma);
 }
 
 /**
@@ -1354,7 +1395,9 @@ void folio_add_file_rmap_range(struct folio *folio, struct page *page,
 	if (nr)
 		__lruvec_stat_mod_folio(folio, NR_FILE_MAPPED, nr);
 
-	mlock_vma_folio(folio, vma, compound);
+	/* See comments in page_add_anon_rmap() */
+	if (!folio_test_large(folio))
+		mlock_vma_folio(folio, vma);
 }
 
 /**
@@ -1465,7 +1508,7 @@ void page_remove_rmap(struct page *page, struct vm_area_struct *vma,
 	 * it's only reliable while mapped.
 	 */
 
-	munlock_vma_folio(folio, vma, compound);
+	munlock_vma_folio(folio, vma);
 }
 
 /*
@@ -1530,7 +1573,8 @@ static bool try_to_unmap_one(struct folio *folio, struct vm_area_struct *vma,
 		if (!(flags & TTU_IGNORE_MLOCK) &&
 		    (vma->vm_flags & VM_LOCKED)) {
 			/* Restore the mlock which got missed */
-			mlock_vma_folio(folio, vma, false);
+			if (!folio_test_large(folio))
+				mlock_vma_folio(folio, vma);
 			page_vma_mapped_walk_done(&pvmw);
 			ret = false;
 			break;