+ mm-khugepaged-use-vma_start_write_killable-in-collapse_huge_page.patch added to mm-new branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: mm/khugepaged: use vma_start_write_killable() in collapse_huge_page()
has been added to the -mm mm-new branch.  Its filename is
     mm-khugepaged-use-vma_start_write_killable-in-collapse_huge_page.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-khugepaged-use-vma_start_write_killable-in-collapse_huge_page.patch

This patch will later appear in the mm-new branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
notice and to finish up reviews.  Please do not hesitate to respond to
review feedback and post updated versions to replace or incrementally
fixup patches in mm-new.

The mm-new branch of mm.git is not included in linux-next

If a few days of testing in mm-new is successful, the patch will me moved
into mm.git's mm-unstable branch, which is included in linux-next

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------------------------------------------------------
From: Suren Baghdasaryan <surenb@google.com>
Subject: mm/khugepaged: use vma_start_write_killable() in collapse_huge_page()
Date: Fri, 27 Mar 2026 13:54:54 -0700

Replace vma_start_write() with vma_start_write_killable(), improving
reaction time to the kill signal.  Replace vma_start_write() in
collapse_huge_page().

Link: https://lkml.kernel.org/r/20260327205457.604224-4-surenb@google.com
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Suggested-by: Matthew Wilcox <willy@infradead.org>
Reviewed-by: Lorenzo Stoakes (Oracle) <ljs@kernel.org>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Barry Song <baohua@kernel.org>
Cc: Byungchul Park <byungchul@sk.com>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Claudio Imbrenda <imbrenda@linux.ibm.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Cc: Gregory Price <gourry@gourry.net>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: "Huang, Ying" <ying.huang@linux.alibaba.com>
Cc: Jann Horn <jannh@google.com>
Cc: Janosch Frank <frankja@linux.ibm.com>
Cc: Joshua Hahn <joshua.hahnjy@gmail.com>
Cc: Kees Cook <kees@kernel.org>
Cc: Lance Yang <lance.yang@linux.dev>
Cc: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Nico Pache <npache@redhat.com>
Cc: Pedro Falcato <pfalcato@suse.de>
Cc: Rakie Kim <rakie.kim@sk.com>
Cc: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/khugepaged.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/mm/khugepaged.c~mm-khugepaged-use-vma_start_write_killable-in-collapse_huge_page
+++ a/mm/khugepaged.c
@@ -1166,7 +1166,10 @@ static enum scan_result collapse_huge_pa
 	if (result != SCAN_SUCCEED)
 		goto out_up_write;
 	/* check if the pmd is still valid */
-	vma_start_write(vma);
+	if (vma_start_write_killable(vma)) {
+		result = SCAN_FAIL;
+		goto out_up_write;
+	}
 	result = check_pmd_still_valid(mm, address, pmd);
 	if (result != SCAN_SUCCEED)
 		goto out_up_write;
_

Patches currently in -mm which might be from surenb@google.com are

mm-vma-cleanup-error-handling-path-in-vma_expand.patch
mm-use-vma_start_write_killable-in-mm-syscalls.patch
mm-khugepaged-use-vma_start_write_killable-in-collapse_huge_page.patch
mm-vma-use-vma_start_write_killable-in-vma-operations.patch
mm-use-vma_start_write_killable-in-process_vma_walk_lock.patch
kvm-ppc-use-vma_start_write_killable-in-kvmppc_memslot_page_merge.patch
mm-vmscan-prevent-mglru-reclaim-from-pinning-address-space.patch