1 files changed, 10 insertions, 0 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index de9b4d8..fbc0c84 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1231,6 +1231,16 @@ void task_numa_work(struct callback_head *work)
 		if (!vma_migratable(vma) || !vma_policy_mof(p, vma))
 			continue;
 
+		/*
+		 * Shared library pages mapped by multiple processes are not
+		 * migrated as it is expected they are cache replicated. Avoid
+		 * hinting faults in read-only file-backed mappings or the vdso
+		 * as migrating the pages will be of marginal benefit.
+		 */
+		if (!vma->vm_mm ||
+		    (vma->vm_file && (vma->vm_flags & (VM_READ|VM_WRITE)) == (VM_READ)))
+			continue;
+
 		do {
 			start = max(start, vma->vm_start);
 			end = ALIGN(start + (pages << PAGE_SHIFT), HPAGE_SIZE);