From 80a4bcac69348e32ccb5ab46401ac2a416fcb576 Mon Sep 17 00:00:00 2001 From: Vernon Yang Date: Sat, 7 Feb 2026 16:16:13 +0800 Subject: [PATCH] mm: khugepaged: set to next mm direct when mm has MMF_DISABLE_THP_COMPLETELY When an mm with the MMF_DISABLE_THP_COMPLETELY flag is detected during scanning, directly set khugepaged_scan.mm_slot to the next mm_slot, reduce redundant operation. Without this patch, entering khugepaged_scan_mm_slot() next time, we will set khugepaged_scan.mm_slot to the next mm_slot. With this patch, we will directly set khugepaged_scan.mm_slot to the next mm_slot. Link: https://lkml.kernel.org/r/20260207081613.588598-6-vernon2gm@gmail.com Signed-off-by: Vernon Yang Acked-by: David Hildenbrand (Red Hat) Reviewed-by: Lance Yang Reviewed-by: Dev Jain Reviewed-by: Barry Song Cc: Baolin Wang Cc: "Liam R. Howlett" Cc: Lorenzo Stoakes Cc: Nico Pache Cc: Ryan Roberts Cc: Zi Yan Signed-off-by: Andrew Morton --- mm/khugepaged.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/mm/khugepaged.c b/mm/khugepaged.c index 1dd3cfca610db..17ab58681032b 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -2508,9 +2508,9 @@ breakouterloop_mmap_lock: VM_BUG_ON(khugepaged_scan.mm_slot != slot); /* * Release the current mm_slot if this mm is about to die, or - * if we scanned all vmas of this mm. + * if we scanned all vmas of this mm, or THP got disabled. */ - if (hpage_collapse_test_exit(mm) || !vma) { + if (hpage_collapse_test_exit_or_disable(mm) || !vma) { /* * Make sure that if mm_users is reaching zero while * khugepaged runs here, khugepaged_exit will find -- 2.47.3