[v2,17/18] selftests/vm: run_vmtests: invoke gup_benchmark with basic FOLL_PIN coverage

Commit Message

John Hubbard Nov. 3, 2019, 9:18 p.m. UTC

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 <[e-mail]>
---
 tools/testing/selftests/vm/run_vmtests | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

Patch

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 "-------------------"