The patch titled
Subject: mm: mmap: no need to call khugepaged_enter_vma() for stack
has been added to the -mm mm-unstable branch. Its filename is
mm-mmap-no-need-to-call-khugepaged_enter_vma-for-stack.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-mmap-no-need-to-call-khugepaged_enter_vma-for-stack.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Yang Shi <yang@xxxxxxxxxxxxxxxxxxxxxx>
Subject: mm: mmap: no need to call khugepaged_enter_vma() for stack
Date: Wed, 20 Dec 2023 22:59:42 -0800
We avoid allocating THP for temporary stack, even tnough
khugepaged_enter_vma() is called for stack VMAs, it actualy returns false.
So no need to call it in the first place at all.
Link: https://lkml.kernel.org/r/20231221065943.2803551-1-shy828301@xxxxxxxxx
Signed-off-by: Yang Shi <yang@xxxxxxxxxxxxxxxxxxxxxx>
Reviewed-by: Yin Fengwei <fengwei.yin@xxxxxxxxx>
Cc: Christopher Lameter <cl@xxxxxxxxx>
Cc: "Huang, Ying" <ying.huang@xxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxxx>
Cc: kernel test robot <oliver.sang@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mmap.c | 2 --
1 file changed, 2 deletions(-)
--- a/mm/mmap.c~mm-mmap-no-need-to-call-khugepaged_enter_vma-for-stack
+++ a/mm/mmap.c
@@ -2049,7 +2049,6 @@ static int expand_upwards(struct vm_area
}
}
anon_vma_unlock_write(vma->anon_vma);
- khugepaged_enter_vma(vma, vma->vm_flags);
mas_destroy(&mas);
validate_mm(mm);
return error;
@@ -2143,7 +2142,6 @@ int expand_downwards(struct vm_area_stru
}
}
anon_vma_unlock_write(vma->anon_vma);
- khugepaged_enter_vma(vma, vma->vm_flags);
mas_destroy(&mas);
validate_mm(mm);
return error;
_
Patches currently in -mm which might be from yang@xxxxxxxxxxxxxxxxxxxxxx are
mm-mmap-no-need-to-call-khugepaged_enter_vma-for-stack.patch
mm-mmap-map-map_stack-to-vm_nohugepage.patch
