Re: [PATCH 2/2] selftests/mm: Allow tests to run with no huge pages support

On Wed, Feb 12, 2025 at 10:52 AM Mark Brown broonie@kernel.org wrote:

Currently the mm selftests refuse to run if huge pages are not available in the current system but this is an optional feature and not all the tests actually require them. Change the test during startup to be non-fatal and skip or omit tests which actually rely on having huge pages, allowing the other tests to be run.

The gup_test does support using madvise() to configure huge pages but it ignores the error code so we just let it run.

Signed-off-by: Mark Brown broonie@kernel.org

We currently deal with the same issue when running selftests on smaller machines or 64k kernels. This is a nice addition.

Reviewed-by: Nico Pache npache@redhat.com

---

tools/testing/selftests/mm/run_vmtests.sh | 66 ++++++++++++++++++++----------- 1 file changed, 42 insertions(+), 24 deletions(-)

diff --git a/tools/testing/selftests/mm/run_vmtests.sh b/tools/testing/selftests/mm/run_vmtests.sh index da7e266681031d2772fb0c4139648904a18e0bf9..d3866b50a6e16a9ba08b6cf33d131edf2a9226be 100755 --- a/tools/testing/selftests/mm/run_vmtests.sh +++ b/tools/testing/selftests/mm/run_vmtests.sh @@ -187,9 +187,10 @@ if [ -n "$freepgs" ] && [ -n "$hpgsize_KB" ]; then printf "Not enough huge pages available (%d < %d)\n" \ "$freepgs" "$needpgs" fi

•   HAVE_HUGEPAGES=1
  

else echo "no hugetlbfs support in kernel?"

•   exit 1
  

•   HAVE_HUGEPAGES=0
  

fi

# filter 64bit architectures @@ -218,13 +219,20 @@ pretty_name() { # Usage: run_test [test binary] [arbitrary test arguments...] run_test() { if test_selected ${CATEGORY}; then

•           local skip=0
  

•           # On memory constrainted systems some tests can fail to allocate hugepages.
            # perform some cleanup before the test for a higher success rate.
            if [ ${CATEGORY} == "thp" -o ${CATEGORY} == "hugetlb" ]; then
  

•                   echo 3 > /proc/sys/vm/drop_caches
  

•                   sleep 2
  

•                   echo 1 > /proc/sys/vm/compact_memory
  

•                   sleep 2
  

•                   if [ "${HAVE_HUGEPAGES}" = "1" ]; then
  

•                           echo 3 > /proc/sys/vm/drop_caches
  

•                           sleep 2
  

•                           echo 1 > /proc/sys/vm/compact_memory
  

•                           sleep 2
  

•                   else
  

•                           echo "hugepages not supported" | tap_prefix
  

•                           skip=1
  

•                   fi
            fi
  
            local test=$(pretty_name "$*")
  

@@ -232,8 +240,12 @@ run_test() { local sep=$(echo -n "$title" | tr "[:graph:][:space:]" -) printf "%s\n%s\n%s\n" "$sep" "$title" "$sep" | tap_prefix

•           ("$@" 2>&1) | tap_prefix
  

•           local ret=${PIPESTATUS[0]}
  

•           if [ "${skip}" != "1" ]; then
  

•                   ("$@" 2>&1) | tap_prefix
  

•                   local ret=${PIPESTATUS[0]}
  

•           else
  

•                   local ret=$ksft_skip
  

•           fi
            count_total=$(( count_total + 1 ))
            if [ $ret -eq 0 ]; then
                    count_pass=$(( count_pass + 1 ))
  

@@ -271,13 +283,15 @@ CATEGORY="hugetlb" run_test ./hugepage-vmemmap CATEGORY="hugetlb" run_test ./hugetlb-madvise CATEGORY="hugetlb" run_test ./hugetlb_dio

-nr_hugepages_tmp=$(cat /proc/sys/vm/nr_hugepages) -# For this test, we need one and just one huge page -echo 1 > /proc/sys/vm/nr_hugepages -CATEGORY="hugetlb" run_test ./hugetlb_fault_after_madv -CATEGORY="hugetlb" run_test ./hugetlb_madv_vs_map -# Restore the previous number of huge pages, since further tests rely on it -echo "$nr_hugepages_tmp" > /proc/sys/vm/nr_hugepages +if [ "${HAVE_HUGEPAGES}" = "1" ]; then

•   nr_hugepages_tmp=$(cat /proc/sys/vm/nr_hugepages)
  

•   # For this test, we need one and just one huge page
  

•   echo 1 > /proc/sys/vm/nr_hugepages
  

•   CATEGORY="hugetlb" run_test ./hugetlb_fault_after_madv
  

•   CATEGORY="hugetlb" run_test ./hugetlb_madv_vs_map
  

•   # Restore the previous number of huge pages, since further tests rely on it
  

•   echo "$nr_hugepages_tmp" > /proc/sys/vm/nr_hugepages
  

+fi

if test_selected "hugetlb"; then echo "NOTE: These hugetlb tests provide minimal coverage. Use" | tap_prefix @@ -391,7 +405,9 @@ CATEGORY="memfd_secret" run_test ./memfd_secret fi

# KSM KSM_MERGE_TIME_HUGE_PAGES test with size of 100 -CATEGORY="ksm" run_test ./ksm_tests -H -s 100 +if [ "${HAVE_HUGEPAGES}" = "1" ]; then

•   CATEGORY="ksm" run_test ./ksm_tests -H -s 100
  

+fi # KSM KSM_MERGE_TIME test with size of 100 CATEGORY="ksm" run_test ./ksm_tests -P -s 100 # KSM MADV_MERGEABLE test with 10 identical pages @@ -440,15 +456,17 @@ CATEGORY="thp" run_test ./transhuge-stress -d 20

# Try to create XFS if not provided if [ -z "${SPLIT_HUGE_PAGE_TEST_XFS_PATH}" ]; then

• if test_selected "thp"; then

•    if grep xfs /proc/filesystems &>/dev/null; then
  

•        XFS_IMG=$(mktemp /tmp/xfs_img_XXXXXX)
  

•        SPLIT_HUGE_PAGE_TEST_XFS_PATH=$(mktemp -d /tmp/xfs_dir_XXXXXX)
  

•        truncate -s 314572800 ${XFS_IMG}
  

•        mkfs.xfs -q ${XFS_IMG}
  

•        mount -o loop ${XFS_IMG} ${SPLIT_HUGE_PAGE_TEST_XFS_PATH}
  

•        MOUNTED_XFS=1
  

•    fi
  

• if [ "${HAVE_HUGEPAGES}" = "1" ]; then

•   if test_selected "thp"; then
  

•       if grep xfs /proc/filesystems &>/dev/null; then
  

•           XFS_IMG=$(mktemp /tmp/xfs_img_XXXXXX)
  

•           SPLIT_HUGE_PAGE_TEST_XFS_PATH=$(mktemp -d /tmp/xfs_dir_XXXXXX)
  

•           truncate -s 314572800 ${XFS_IMG}
  

•           mkfs.xfs -q ${XFS_IMG}
  

•           mount -o loop ${XFS_IMG} ${SPLIT_HUGE_PAGE_TEST_XFS_PATH}
  

•           MOUNTED_XFS=1
  

•       fi
  

•   fi
  

  fi

fi

-- 2.39.5