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ksm: use precise linear_page_index instead of the whole address space

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Since we now have linear_page_index available that we can use here,
allowing for optimizing the RMAP walk, we can also use it to locate more
precisely all related-processes when error hits the KSM page, which will
decrease a lot of invalid iterations.

Link: https://lore.kernel.org/20260709173312403qgj1Af6pRkFMDSsmc19sM@zte.com.cn
Signed-off-by: xu xin <xu.xin16@zte.com.cn>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Cc: Chengming Zhou <chengming.zhou@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
xu xin
2026-07-09 17:33:12 +08:00
committed by Andrew Morton
parent 887311e5cd
commit 0471cade0a
1 changed files with 3 additions and 2 deletions
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5
mm/ksm.c
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@@ -3290,12 +3290,13 @@ void collect_procs_ksm(const struct folio *folio, const struct page *page,
for_each_process(tsk) {
struct anon_vma_chain *vmac;
const unsigned long addr = rmap_item->address & PAGE_MASK;
const unsigned long index = rmap_item->linear_page_index;
struct task_struct *t =
task_early_kill(tsk, force_early);
if (!t)
continue;
anon_vma_interval_tree_foreach(vmac, &av->rb_root, 0,
ULONG_MAX)
anon_vma_interval_tree_foreach(vmac, &av->rb_root, index,
index)
{
vma = vmac->vma;
if (vma->vm_mm == t->mm) {