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mm/khugepaged: fix comment for default scan sleep duration

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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.  While at it, replace the magic value 512 by HPAGE_PMD_NR and
use 'ptes'.

Link: https://lkml.kernel.org/r/20251015092957.37432-1-lianux.mm@gmail.com
Signed-off-by: wang lian <lianux.mm@gmail.com>
Suggested-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Dev Jain <dev.jain@arm.com>
Reviewed-by: Wei Yang <richard.weiyang@gmail.com>
Reviewed-by: Lance Yang <lance.yang@linux.dev>
Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Reviewed-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Acked-by: Nico Pache <npache@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Barry Song <baohua@kernel.org>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
wang lian
2025-10-15 17:29:57 +08:00
committed by Andrew Morton
parent 2f79ddb64b
commit a059ad48b4
1 changed files with 1 additions and 1 deletions
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mm/khugepaged.c
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@@ -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;