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mm: khugepaged: set to next mm direct when mm has MMF_DISABLE_THP_COMPLETELY

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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 <yanglincheng@kylinos.cn>
Acked-by: David Hildenbrand (Red Hat) <david@kernel.org>
Reviewed-by: Lance Yang <lance.yang@linux.dev>
Reviewed-by: Dev Jain <dev.jain@arm.com>
Reviewed-by: Barry Song <baohua@kernel.org>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: "Liam R. Howlett" <Liam.Howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Nico Pache <npache@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:
Vernon Yang 2026-02-07 16:16:13 +08:00 committed by Andrew Morton
parent 15c578d0dc
commit 80a4bcac69
1 changed files with 2 additions and 2 deletions
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4
mm/khugepaged.c
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@ -2508,9 +2508,9 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages, enum scan_result
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