Re: [PATCH v11 3/3] ksm: add mremap selftests for ksm_rmap_walk

[David Hildenbrand (Arm)]

On 7/3/26 10:26, xu.xin16@xxxxxxxxxx wrote:
> From: xu xin <xu.xin16@xxxxxxxxxx>
> 
> The existing tools/testing/selftests/mm/rmap.c has already one testcase
> for ksm_rmap_walk in TEST_F(migrate, ksm), which takes use of migration
> of page from one NUMA node to another NUMA node. However, it just lacks
> the scenario of mremapped VMAs.
> 
> We add the calling of mremap() and then trigger KSM to merge pages before
> migrating, which is specifically to test an optimization which is
> introduced by this patch ("ksm: Optimize rmap_walk_ksm by passing a
> suitable address pgoff").
> 
> This test can reproduce the issue that Hugh points out at
> https://lore.kernel.org/all/02e1b8df-d568-8cbb-b8f6-46d5476d9d75@xxxxxxxxxx/
> 
> Signed-off-by: xu xin <xu.xin16@xxxxxxxxxx>
> ---

Acked-by: David Hildenbrand (Arm) <david@xxxxxxxxxx>

-- 
Cheers,

David