linux-kernel - [PATCH V2] mm/khugepaged: fix comment for default scan sleep duration

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Message-ID: <20251015092957.37432-1-lianux.mm@gmail.com>
Date: Wed, 15 Oct 2025 17:29:57 +0800
From: wang lian <lianux.mm@...il.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: David Hildenbrand <david@...hat.com>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	Zi Yan <ziy@...dia.com>,
	Baolin Wang <baolin.wang@...ux.alibaba.com>,
	"Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Nico Pache <npache@...hat.com>,
	Ryan Roberts <ryan.roberts@....com>,
	Dev Jain <dev.jain@....com>,
	Barry Song <baohua@...nel.org>,
	Lance Yang <lance.yang@...ux.dev>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	Wei Yang <richard.weiyang@...il.com>,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	wang lian <lianux.mm@...il.com>
Subject: [PATCH V2] mm/khugepaged: fix comment for default scan sleep duration

The comment for khugepaged_scan_sleep_millisecs incorrectly states
the default scan period is 30 seconds. The actual default value in the
code is 10000ms (10 seconds).

This patch corrects the comment to match the code, preventing potential
confusion. The incorrect comment has existed since the feature was
first introduced.

Fixes: ba76149f47d8 ("thp: khugepaged")

Signed-off-by: wang lian <lianux.mm@...il.com>
Suggested-by: David Hildenbrand <david@...hat.com>
Reviewed-by: Dev Jain <dev.jain@....com>
Reviewed-by: Wei Yang <richard.weiyang@...il.com>
Reviewed-by: Lance Yang <lance.yang@...ux.dev>
---
 mm/khugepaged.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index e947b96e1443..d635d821f611 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -67,7 +67,7 @@ enum scan_result {
 static struct task_struct *khugepaged_thread __read_mostly;
 static DEFINE_MUTEX(khugepaged_mutex);
 
-/* default scan 8*512 pte (or vmas) every 30 second */
+/* default scan 8*HPAGE_PMD_NR ptes (or vmas) every 10 second */
 static unsigned int khugepaged_pages_to_scan __read_mostly;
 static unsigned int khugepaged_pages_collapsed;
 static unsigned int khugepaged_full_scans;
-- 
2.50.1 (Apple Git-155)