linux-kernel - Re: [PATCH v4 22/23] selftests/vm: run_vmtests: invoke gup_benchmark with basic FOLL

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Date:   Wed, 13 Nov 2019 11:06:02 -0800
From:   Ira Weiny <ira.weiny@...el.com>
To:     John Hubbard <jhubbard@...dia.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Alex Williamson <alex.williamson@...hat.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Björn Töpel <bjorn.topel@...el.com>,
        Christoph Hellwig <hch@...radead.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Dave Chinner <david@...morbit.com>,
        David Airlie <airlied@...ux.ie>,
        "David S . Miller" <davem@...emloft.net>, Jan Kara <jack@...e.cz>,
        Jason Gunthorpe <jgg@...pe.ca>, Jens Axboe <axboe@...nel.dk>,
        Jonathan Corbet <corbet@....net>,
        Jérôme Glisse <jglisse@...hat.com>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Michal Hocko <mhocko@...e.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Paul Mackerras <paulus@...ba.org>,
        Shuah Khan <shuah@...nel.org>,
        Vlastimil Babka <vbabka@...e.cz>, bpf@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, kvm@...r.kernel.org,
        linux-block@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-media@...r.kernel.org, linux-rdma@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, netdev@...r.kernel.org,
        linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 22/23] selftests/vm: run_vmtests: invoke gup_benchmark
 with basic FOLL_PIN coverage

On Tue, Nov 12, 2019 at 08:27:09PM -0800, John Hubbard wrote:
> It's good to have basic unit test coverage of the new FOLL_PIN
> behavior. Fortunately, the gup_benchmark unit test is extremely
> fast (a few milliseconds), so adding it the the run_vmtests suite
> is going to cause no noticeable change in running time.
> 
> So, add two new invocations to run_vmtests:
> 
> 1) Run gup_benchmark with normal get_user_pages().
> 
> 2) Run gup_benchmark with pin_user_pages(). This is much like
> the first call, except that it sets FOLL_PIN.
> 
> Running these two in quick succession also provide a visual
> comparison of the running times, which is convenient.
> 
> The new invocations are fairly early in the run_vmtests script,
> because with test suites, it's usually preferable to put the
> shorter, faster tests first, all other things being equal.
> 
> Signed-off-by: John Hubbard <jhubbard@...dia.com>

Reviewed-by: Ira Weiny <ira.weiny@...el.com>

> ---
>  tools/testing/selftests/vm/run_vmtests | 22 ++++++++++++++++++++++
>  1 file changed, 22 insertions(+)
> 
> diff --git a/tools/testing/selftests/vm/run_vmtests b/tools/testing/selftests/vm/run_vmtests
> index 951c507a27f7..93e8dc9a7cad 100755
> --- a/tools/testing/selftests/vm/run_vmtests
> +++ b/tools/testing/selftests/vm/run_vmtests
> @@ -104,6 +104,28 @@ echo "NOTE: The above hugetlb tests provide minimal coverage.  Use"
>  echo "      https://github.com/libhugetlbfs/libhugetlbfs.git for"
>  echo "      hugetlb regression testing."
>  
> +echo "--------------------------------------------"
> +echo "running 'gup_benchmark -U' (normal/slow gup)"
> +echo "--------------------------------------------"
> +./gup_benchmark -U
> +if [ $? -ne 0 ]; then
> +	echo "[FAIL]"
> +	exitcode=1
> +else
> +	echo "[PASS]"
> +fi
> +
> +echo "------------------------------------------"
> +echo "running gup_benchmark -c (pin_user_pages)"
> +echo "------------------------------------------"
> +./gup_benchmark -c
> +if [ $? -ne 0 ]; then
> +	echo "[FAIL]"
> +	exitcode=1
> +else
> +	echo "[PASS]"
> +fi
> +
>  echo "-------------------"
>  echo "running userfaultfd"
>  echo "-------------------"
> -- 
> 2.24.0
>