Re: [RFC PATCH v5 06/10] KVM: selftests: Add a helper to get system configured THP page size

[Andrew Jones]

On Tue, Mar 23, 2021 at 09:52:27PM +0800, Yanan Wang wrote:
> If we want to have some tests about transparent hugepages, the system
> configured THP hugepage size should better be known by the tests, which
> can be used for kinds of alignment or guest memory accessing of vcpus...
> So it makes sense to add a helper to get the transparent hugepage size.
> 
> With VM_MEM_SRC_ANONYMOUS_THP specified in vm_userspace_mem_region_add(),
> we now stat /sys/kernel/mm/transparent_hugepage to check whether THP is
> configured in the host kernel before madvise(). Based on this, we can also
> read file /sys/kernel/mm/transparent_hugepage/hpage_pmd_size to get THP
> hugepage size.
> 
> Signed-off-by: Yanan Wang <wangyanan55@xxxxxxxxxx>
> Reviewed-by: Ben Gardon <bgardon@xxxxxxxxxx>
> ---
>  .../testing/selftests/kvm/include/test_util.h |  2 ++
>  tools/testing/selftests/kvm/lib/test_util.c   | 29 +++++++++++++++++++
>  2 files changed, 31 insertions(+)


Reviewed-by: Andrew Jones <drjones@xxxxxxxxxx>