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mm/ksm: use vma iterators instead of vma linked list

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Remove the use of the linked list for eventual removal.

Link: https://lkml.kernel.org/r/20220906194824.2110408-54-Liam.Howlett@oracle.com
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Reviewed-by: Davidlohr Bueso <dave@stgolabs.net>
Tested-by: Yu Zhao <yuzhao@google.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Howells <dhowells@redhat.com>
Cc: SeongJae Park <sj@kernel.org>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2022-09-06 19:49:01 +00:00 committed by Andrew Morton
parent 685405020b
commit a5f18ba072
1 changed files with 11 additions and 7 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

18
mm/ksm.c
View file

@ -981,11 +981,13 @@ static int unmerge_and_remove_all_rmap_items(void)
struct mm_slot, mm_list);
spin_unlock(&ksm_mmlist_lock);
for (mm_slot = ksm_scan.mm_slot;
mm_slot != &ksm_mm_head; mm_slot = ksm_scan.mm_slot) {
for (mm_slot = ksm_scan.mm_slot; mm_slot != &ksm_mm_head;
mm_slot = ksm_scan.mm_slot) {
VMA_ITERATOR(vmi, mm_slot->mm, 0);
mm = mm_slot->mm;
mmap_read_lock(mm);
for (vma = mm->mmap; vma; vma = vma->vm_next) {
for_each_vma(vmi, vma) {
if (ksm_test_exit(mm))
break;
if (!(vma->vm_flags & VM_MERGEABLE) || !vma->anon_vma)
@ -2243,6 +2245,7 @@ static struct rmap_item *scan_get_next_rmap_item(struct page **page)
struct mm_slot *slot;
struct vm_area_struct *vma;
struct rmap_item *rmap_item;
struct vma_iterator vmi;
int nid;
if (list_empty(&ksm_mm_head.mm_list))
@ -2301,13 +2304,13 @@ static struct rmap_item *scan_get_next_rmap_item(struct page **page)
}
mm = slot->mm;
vma_iter_init(&vmi, mm, ksm_scan.address);
mmap_read_lock(mm);
if (ksm_test_exit(mm))
vma = NULL;
else
vma = find_vma(mm, ksm_scan.address);
goto no_vmas;
for (; vma; vma = vma->vm_next) {
for_each_vma(vmi, vma) {
if (!(vma->vm_flags & VM_MERGEABLE))
continue;
if (ksm_scan.address < vma->vm_start)
@ -2345,6 +2348,7 @@ static struct rmap_item *scan_get_next_rmap_item(struct page **page)
}
if (ksm_test_exit(mm)) {
no_vmas:
ksm_scan.address = 0;
ksm_scan.rmap_list = &slot->rmap_list;
}