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

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Message-ID: <20210323140742.5nubgjbwvqe7c52f@kamzik.brq.redhat.com>
Date:   Tue, 23 Mar 2021 15:07:42 +0100
From:   Andrew Jones <drjones@...hat.com>
To:     Yanan Wang <wangyanan55@...wei.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        Ben Gardon <bgardon@...gle.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Peter Xu <peterx@...hat.com>, Ingo Molnar <mingo@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Arnd Bergmann <arnd@...db.de>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        wanghaibin.wang@...wei.com, yuzenghui@...wei.com
Subject: Re: [RFC PATCH v5 06/10] KVM: selftests: Add a helper to get system
 configured THP page size

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@...wei.com>
> Reviewed-by: Ben Gardon <bgardon@...gle.com>
> ---
>  .../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@...hat.com>