linux-kernel - Re: [PATCH v2 1/6] selftests: vm: add hugetlb_shared userfaultfd test to run

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Date:   Tue, 26 Apr 2022 10:06:36 -0600
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Axel Rasmussen <axelrasmussen@...gle.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Charan Teja Reddy <charante@...eaurora.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "Dmitry V . Levin" <ldv@...linux.org>,
        Gleb Fotengauer-Malinovskiy <glebfm@...linux.org>,
        Hugh Dickins <hughd@...gle.com>, Jan Kara <jack@...e.cz>,
        Jonathan Corbet <corbet@....net>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Mike Rapoport <rppt@...nel.org>, Nadav Amit <namit@...are.com>,
        Peter Xu <peterx@...hat.com>, Shuah Khan <shuah@...nel.org>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>, zhangyi <yi.zhang@...wei.com>
Cc:     linux-doc@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-kselftest@...r.kernel.org,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH v2 1/6] selftests: vm: add hugetlb_shared userfaultfd test
 to run_vmtests.sh

On 4/22/22 3:29 PM, Axel Rasmussen wrote:
> This not being included was just a simple oversight. There are certain
> features (like minor fault support) which are only enabled on shared
> mappings, so without including hugetlb_shared we actually lose a
> significant amount of test coverage.
> 
> Signed-off-by: Axel Rasmussen <axelrasmussen@...gle.com>
> ---
>   tools/testing/selftests/vm/run_vmtests.sh | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/testing/selftests/vm/run_vmtests.sh b/tools/testing/selftests/vm/run_vmtests.sh
> index a2302b5faaf2..5065dbd89bdb 100755
> --- a/tools/testing/selftests/vm/run_vmtests.sh
> +++ b/tools/testing/selftests/vm/run_vmtests.sh
> @@ -121,9 +121,11 @@ run_test ./gup_test -a
>   run_test ./gup_test -ct -F 0x1 0 19 0x1000
>   
>   run_test ./userfaultfd anon 20 16
> -# Test requires source and destination huge pages.  Size of source
> -# (half_ufd_size_MB) is passed as argument to test.
> +# Hugetlb tests require source and destination huge pages. Pass in half the
> +# size ($half_ufd_size_MB), which is used for *each*.
>   run_test ./userfaultfd hugetlb "$half_ufd_size_MB" 32
> +run_test ./userfaultfd hugetlb_shared "$half_ufd_size_MB" 32 "$mnt"/uffd-test
> +rm -f "$mnt"/uffd-test
>   run_test ./userfaultfd shmem 20 16
>   
>   #cleanup
> 

Looks good to me.

Reviewed-by: Shuah Khan <skhan@...uxfoundation.org>

thanks,
-- Shuah