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Content-Transfer-Encoding: 7bit On 12/24/2025 8:19 PM, Wei Yang wrote: > On Wed, Dec 24, 2025 at 07:51:36PM +0800, Lance Yang wrote: >> >> >> On 2025/12/24 19:13, Shivank Garg wrote: >>> The khugepaged_scan_mm_slot() uses a 'progress' counter to limit the >>> amount of work performed and consists of three components: >>> 1. Transitioning to a new mm (+1). > > Hmm... maybe not only a new mm, but also we start another scan from last mm. > > Since default khugepaged_pages_to_scan is 8 PMD, it looks very possible. > It makes sense, will correct this. >>> 2. Skipping an unsuitable VMA (+1). >>> 3. Scanning a PMD-sized range (+HPAGE_PMD_NR). >>> >>> Consider a 1MB VMA sitting between two 2MB alignment boundaries: >>> >>> vma1 vma2 vma3 >>> +----------+------+----------+ >>> |2M |1M |2M | >>> +----------+------+----------+ >>> ^ ^ >>> start end >>> ^ >>> hstart,hend >>> >>> In this case, for vma2: >>> hstart = round_up(start, HPAGE_PMD_SIZE) -> Next 2MB alignment >>> hend = round_down(end, HPAGE_PMD_SIZE) -> Prev 2MB alignment >>> >>> Currently, since `hend <= hstart`, VMAs that are too small or unaligned >>> to contain a hugepage are skipped without incrementing 'progress'. >>> A process containing a large number of such small VMAs will unfairly >>> consume more CPU cycles before yielding compared to a process with >>> fewer, larger, or aligned VMAs. >>> >>> Fix this by incrementing progress when the `hend <= hstart` condition >>> is met. >>> >>> Additionally, change 'progress' type to `unsigned int` to match both >>> the 'pages' type and the function return value. >>> >>> Suggested-by: Wei Yang >>> Signed-off-by: Shivank Garg >>> --- >>> mm/khugepaged.c | 4 ++-- >>> 1 file changed, 2 insertions(+), 2 deletions(-) >>> >>> diff --git a/mm/khugepaged.c b/mm/khugepaged.c >>> index 107146f012b1..0b549c3250f9 100644 >>> --- a/mm/khugepaged.c >>> +++ b/mm/khugepaged.c >>> @@ -2403,7 +2403,7 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages, int *result, >>> struct mm_slot *slot; >>> struct mm_struct *mm; >>> struct vm_area_struct *vma; >>> - int progress = 0; >>> + unsigned int progress = 0; >>> VM_BUG_ON(!pages); >>> lockdep_assert_held(&khugepaged_mm_lock); >>> @@ -2447,7 +2447,7 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages, int *result, >>> } >>> hstart = round_up(vma->vm_start, HPAGE_PMD_SIZE); >>> hend = round_down(vma->vm_end, HPAGE_PMD_SIZE); >>> - if (khugepaged_scan.address > hend) { >> >> Maybe add a short comment explaining why we increment progress for small VMAs >> ;) >> >> Something like this: >> >> /* Count small VMAs that can't hold a hugepage towards scan limit */ I'll add explanation. >>> + if (khugepaged_scan.address > hend || hend <= hstart) { >>> progress++; >>> continue; >>> } >> >> Otherwise, looks good to me. >> >> Reviewed-by: Lance Yang >> > > The code change LGTM. > > Reviewed-by: Wei Yang > Thanks Lance and Wei. 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