The patch titled
Subject: mm/khugepaged: stop using vma linked list
has been added to the -mm mm-unstable branch. Its filename is
mm-khugepaged-stop-using-vma-linked-list.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-khugepaged-stop-using-vma-linked-list.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: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Subject: mm/khugepaged: stop using vma linked list
Date: Mon, 22 Aug 2022 15:06:28 +0000
Use vma iterator & find_vma() instead of vma linked list.
Link: https://lkml.kernel.org/r/20220822150128.1562046-53-Liam.Howlett@xxxxxxxxxx
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: David Howells <dhowells@xxxxxxxxxx>
Cc: SeongJae Park <sj@xxxxxxxxxx>
Cc: Sven Schnelle <svens@xxxxxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: Yu Zhao <yuzhao@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/huge_memory.c | 4 ++--
mm/khugepaged.c | 11 ++++++++---
2 files changed, 10 insertions(+), 5 deletions(-)
--- a/mm/huge_memory.c~mm-khugepaged-stop-using-vma-linked-list
+++ a/mm/huge_memory.c
@@ -2339,11 +2339,11 @@ void vma_adjust_trans_huge(struct vm_are
split_huge_pmd_if_needed(vma, end);
/*
- * If we're also updating the vma->vm_next->vm_start,
+ * If we're also updating the next vma vm_start,
* check if we need to split it.
*/
if (adjust_next > 0) {
- struct vm_area_struct *next = vma->vm_next;
+ struct vm_area_struct *next = find_vma(vma->vm_mm, vma->vm_end);
unsigned long nstart = next->vm_start;
nstart += adjust_next;
split_huge_pmd_if_needed(next, nstart);
--- a/mm/khugepaged.c~mm-khugepaged-stop-using-vma-linked-list
+++ a/mm/khugepaged.c
@@ -2053,10 +2053,12 @@ static unsigned int khugepaged_scan_mm_s
__releases(&khugepaged_mm_lock)
__acquires(&khugepaged_mm_lock)
{
+ struct vma_iterator vmi;
struct mm_slot *mm_slot;
struct mm_struct *mm;
struct vm_area_struct *vma;
int progress = 0;
+ unsigned long address;
VM_BUG_ON(!pages);
lockdep_assert_held(&khugepaged_mm_lock);
@@ -2081,11 +2083,14 @@ static unsigned int khugepaged_scan_mm_s
vma = NULL;
if (unlikely(!mmap_read_trylock(mm)))
goto breakouterloop_mmap_lock;
- if (likely(!hpage_collapse_test_exit(mm)))
- vma = find_vma(mm, khugepaged_scan.address);
progress++;
- for (; vma; vma = vma->vm_next) {
+ if (unlikely(hpage_collapse_test_exit(mm)))
+ goto breakouterloop;
+
+ address = khugepaged_scan.address;
+ vma_iter_init(&vmi, mm, address);
+ for_each_vma(vmi, vma) {
unsigned long hstart, hend;
cond_resched();
_
Patches currently in -mm which might be from willy@xxxxxxxxxxxxx are
support-highmem-pages-in-vmap_pages_range_noflush.patch
mm-add-vma-iterator.patch
mmap-use-the-vma-iterator-in-count_vma_pages_range.patch
proc-remove-vma-rbtree-use-from-nommu.patch
arm64-remove-mmap-linked-list-from-vdso.patch
parisc-remove-mmap-linked-list-from-cache-handling.patch
powerpc-remove-mmap-linked-list-walks.patch
s390-remove-vma-linked-list-walks.patch
x86-remove-vma-linked-list-walks.patch
xtensa-remove-vma-linked-list-walks.patch
cxl-remove-vma-linked-list-walk.patch
optee-remove-vma-linked-list-walk.patch
um-remove-vma-linked-list-walk.patch
coredump-remove-vma-linked-list-walk.patch
exec-use-vma-iterator-instead-of-linked-list.patch
fs-proc-task_mmu-stop-using-linked-list-and-highest_vm_end.patch
acct-use-vma-iterator-instead-of-linked-list.patch
perf-use-vma-iterator.patch
sched-use-maple-tree-iterator-to-walk-vmas.patch
fork-use-vma-iterator.patch
mm-khugepaged-stop-using-vma-linked-list.patch
mm-ksm-use-vma-iterators-instead-of-vma-linked-list.patch
mm-mlock-use-vma-iterator-and-maple-state-instead-of-vma-linked-list.patch
mm-pagewalk-use-vma_find-instead-of-vma-linked-list.patch
i915-use-the-vma-iterator.patch
nommu-remove-uses-of-vma-linked-list.patch
