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Message-Id: <20250212-kselftest-mm-no-hugepages-v1-2-44702f538522@kernel.org>
Date: Wed, 12 Feb 2025 17:44:26 +0000
From: Mark Brown <broonie@...nel.org>
To: Andrew Morton <akpm@...ux-foundation.org>,
Shuah Khan <shuah@...nel.org>
Cc: Nico Pache <npache@...hat.com>, linux-mm@...ck.org,
linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
Mark Brown <broonie@...nel.org>
Subject: [PATCH 2/2] selftests/mm: Allow tests to run with no huge pages
support
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@...nel.org>
---
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
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