On Tue, Jun 14, 2022 at 01:16:45AM -0600, Yu Zhao wrote:

+static bool get_next_vma(unsigned long mask, unsigned long size, struct mm_walk *args,
+			 unsigned long *vm_start, unsigned long *vm_end)
+{
+	unsigned long start = round_up(*vm_end, size);
+	unsigned long end = (start | ~mask) + 1;
+
+	VM_WARN_ON_ONCE(mask & size);
+	VM_WARN_ON_ONCE((start & mask) != (*vm_start & mask));
+
+	while (args->vma) {
+		if (start >= args->vma->vm_end) {
+			args->vma = args->vma->vm_next;
+			continue;
+		}
+
+		if (end && end <= args->vma->vm_start)
+			return false;
+
+		if (should_skip_vma(args->vma->vm_start, args->vma->vm_end, args)) {
+			args->vma = args->vma->vm_next;
+			continue;
+		}
+
+		*vm_start = max(start, args->vma->vm_start);
+		*vm_end = min(end - 1, args->vma->vm_end - 1) + 1;
+
+		return true;
+	}
+
+	return false;
+}

Andrew,

The above function has a conflict with Maple Tree. Please use the
following fix-up if you apply MGLRU on top of Maple Tree. Thanks.

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 69a52aae1e03..05e62948e365 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c

@@ -3749,23 +3749,14 @@ static bool get_next_vma(unsigned long mask, unsigned long size, struct mm_walk
 {
 	unsigned long start = round_up(*vm_end, size);
 	unsigned long end = (start | ~mask) + 1;
+	VMA_ITERATOR(vmi, args->mm, start);
 
 	VM_WARN_ON_ONCE(mask & size);
 	VM_WARN_ON_ONCE((start & mask) != (*vm_start & mask));
 
-	while (args->vma) {
-		if (start >= args->vma->vm_end) {
-			args->vma = args->vma->vm_next;
+	for_each_vma_range(vmi, args->vma, end) {
+		if (should_skip_vma(args->vma->vm_start, args->vma->vm_end, args))
 			continue;
-		}
-
-		if (end && end <= args->vma->vm_start)
-			return false;
-
-		if (should_skip_vma(args->vma->vm_start, args->vma->vm_end, args)) {
-			args->vma = args->vma->vm_next;
-			continue;
-		}
 
 		*vm_start = max(start, args->vma->vm_start);
 		*vm_end = min(end - 1, args->vma->vm_end - 1) + 1;

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