linux-kernel - [PATCH mm-new v4 6/6] mm: khugepaged: set to next mm direct when mm has MMF_DISABLE_THP

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Message-ID: <20260111121909.8410-7-yanglincheng@kylinos.cn>
Date: Sun, 11 Jan 2026 20:19:09 +0800
From: Vernon Yang <vernon2gm@...il.com>
To: akpm@...ux-foundation.org,
	david@...nel.org
Cc: lorenzo.stoakes@...cle.com,
	ziy@...dia.com,
	dev.jain@....com,
	baohua@...nel.org,
	lance.yang@...ux.dev,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Vernon Yang <yanglincheng@...inos.cn>
Subject: [PATCH mm-new v4 6/6] 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.

Signed-off-by: Vernon Yang <yanglincheng@...inos.cn>
---
 mm/khugepaged.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 8a7008760566..4c055d6c2717 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -2566,7 +2566,7 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages, enum scan_result
 	 * Release the current mm_slot if this mm is about to die, or
 	 * if we scanned all vmas of this mm.
 	 */
-	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
-- 
2.51.0