[PATCH v9] selftests/vm: enable running select groups of tests

From: Joel Savitz
Date: Tue Oct 18 2022 - 19:12:59 EST

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Our memory management kernel CI testing at Red Hat uses the VM
selftests and we have run into two problems:

First, our LTP tests overlap with the VM selftests.

We want to avoid unhelpful redundancy in our testing practices.

Second, we have observed the current run_vmtests.sh to report overall
failure/ambiguous results in the case that a machine lacks the necessary
hardware to perform one or more of the tests. E.g. ksm tests that
require more than one numa node.

We want to be able to run the vm selftests suitable to particular hardware.

Add the ability to run one or more groups of vm tests via run_vmtests.sh
instead of simply all-or-none in order to solve these problems.

Preserve existing default behavior of running all tests when the script
is invoked with no arguments.

Documentation of test groups is included in the patch as follows:

# ./run_vmtests.sh [ -h || --help ]

usage: ./tools/testing/selftests/vm/run_vmtests.sh [ -h | -t "<categories>"]
-t: specify specific categories to tests to run
-h: display this message

The default behavior is to run all tests.

Alternatively, specific groups tests can be run by passing a string
to the -t argument containing one or more of the following categories
separated by spaces:
- mmap
tests for mmap(2)
- gup_test
tests for gup using gup_test interface
- userfaultfd
tests for userfaultfd(2)
- compaction
a test for the patch "Allow compaction of unevictable pages"
- mlock
tests for mlock(2)
- mremap
tests for mremap(2)
- hugevm
tests for very large virtual address space
- vmalloc
vmalloc smoke tests
- hmm
hmm smoke tests
- madv_populate
test memadvise(2) MADV_POPULATE_{READ,WRITE} options
- memfd_secret
test memfd_secret(2)
- process_mrelease
test process_mrelease(2)
- ksm
ksm tests that do not require >=2 NUMA nodes
- ksm_numa
ksm tests that require >=2 NUMA nodes
- pkey
memory protection key tests
- soft_dirty
test soft dirty page bit semantics
- anon_cow
test anonymous copy-on-write semantics
example: ./run_vmtests.sh -t "hmm mmap ksm"

Changes from v6:
- rebase onto mm-unstable per akpm's request
- add control and usage for soft_dirty and anon_cow tests

Changes from v5:
- rebase onto mainline master branch
- integrate changes to pkey and userfaultfd invocation sites

Changes from v4:
- fix imprecise checking in test_selected
- drop conditional setup/cleanup of hugetlb

Changes from v3:
- rename variable TEST_ITEMS as VM_TEST_ITEMS

Changes from v2:
- rebase onto the mm-everyting branch in
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git
- integrate this functionality with new the tests

Changes from v1:
- use a command line argument to pass the test categories to the
script instead of an environmet variable
- remove novel prints to avoid messing with extant parsers of this
script
- update the usage text

Signed-off-by: Joel Savitz <jsavitz@xxxxxxxxxx>
---
tools/testing/selftests/vm/run_vmtests.sh | 216 +++++++++++++++-------
1 file changed, 148 insertions(+), 68 deletions(-)

diff --git a/tools/testing/selftests/vm/run_vmtests.sh b/tools/testing/selftests/vm/run_vmtests.sh
index 1fa783732296..0eb16f427a61 100755
--- a/tools/testing/selftests/vm/run_vmtests.sh
+++ b/tools/testing/selftests/vm/run_vmtests.sh
@@ -1,21 +1,86 @@
#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
-#please run as root
+# Please run as root

# Kselftest framework requirement - SKIP code is 4.
ksft_skip=4

exitcode=0

-#get huge pagesize and freepages from /proc/meminfo
-while read -r name size unit; do
- if [ "$name" = "HugePages_Free:" ]; then
- freepgs="$size"
+usage() {
+ cat <<EOF
+usage: ${BASH_SOURCE[0]:-$0} [ -h | -t "<categories>"]
+ -t: specify specific categories to tests to run
+ -h: display this message
+
+The default behavior is to run all tests.
+
+Alternatively, specific groups tests can be run by passing a string
+to the -t argument containing one or more of the following categories
+separated by spaces:
+- mmap
+ tests for mmap(2)
+- gup_test
+ tests for gup using gup_test interface
+- userfaultfd
+ tests for userfaultfd(2)
+- compaction
+ a test for the patch "Allow compaction of unevictable pages"
+- mlock
+ tests for mlock(2)
+- mremap
+ tests for mremap(2)
+- hugevm
+ tests for very large virtual address space
+- vmalloc
+ vmalloc smoke tests
+- hmm
+ hmm smoke tests
+- madv_populate
+ test memadvise(2) MADV_POPULATE_{READ,WRITE} options
+- memfd_secret
+ test memfd_secret(2)
+- process_mrelease
+ test process_mrelease(2)
+- ksm
+ ksm tests that do not require >=2 NUMA nodes
+- ksm_numa
+ ksm tests that require >=2 NUMA nodes
+- pkey
+ memory protection key tests
+- soft_dirty
+ test soft dirty page bit semantics
+- anon_cow
+ test anonymous copy-on-write semantics
+example: ./run_vmtests.sh -t "hmm mmap ksm"
+EOF
+ exit 0
+}
+
+
+while getopts "ht:" OPT; do
+ case ${OPT} in
+ "h") usage ;;
+ "t") VM_SELFTEST_ITEMS=${OPTARG} ;;
+ esac
+done
+shift $((OPTIND -1))
+
+# default behavior: run all tests
+VM_SELFTEST_ITEMS=${VM_SELFTEST_ITEMS:-default}
+
+test_selected() {
+ if [ "$VM_SELFTEST_ITEMS" == "default" ]; then
+ # If no VM_SELFTEST_ITEMS are specified, run all tests
+ return 0
fi
- if [ "$name" = "Hugepagesize:" ]; then
- hpgsize_KB="$size"
+ # If test selected argument is one of the test items
+ if [[ " ${VM_SELFTEST_ITEMS[*]} " =~ " ${1} " ]]; then
+ return 0
+ else
+ return 1
fi
-done < /proc/meminfo
+}

# Simple hugetlbfs tests have a hardcoded minimum requirement of
# huge pages totaling 256MB (262144KB) in size. The userfaultfd
@@ -27,7 +92,17 @@ hpgsize_MB=$((hpgsize_KB / 1024))
half_ufd_size_MB=$((((nr_cpus * hpgsize_MB + 127) / 128) * 128))
needmem_KB=$((half_ufd_size_MB * 2 * 1024))

-#set proper nr_hugepages
+# get huge pagesize and freepages from /proc/meminfo
+while read -r name size unit; do
+ if [ "$name" = "HugePages_Free:" ]; then
+ freepgs="$size"
+ fi
+ if [ "$name" = "Hugepagesize:" ]; then
+ hpgsize_KB="$size"
+ fi
+done < /proc/meminfo
+
+# set proper nr_hugepages
if [ -n "$freepgs" ] && [ -n "$hpgsize_KB" ]; then
nr_hugepgs=$(cat /proc/sys/vm/nr_hugepages)
needpgs=$((needmem_KB / hpgsize_KB))
@@ -56,136 +131,141 @@ else
exit 1
fi

-#filter 64bit architectures
+# filter 64bit architectures
ARCH64STR="arm64 ia64 mips64 parisc64 ppc64 ppc64le riscv64 s390x sh64 sparc64 x86_64"
if [ -z "$ARCH" ]; then
ARCH=$(uname -m 2>/dev/null | sed -e 's/aarch64.*/arm64/')
fi
VADDR64=0
-echo "$ARCH64STR" | grep "$ARCH" && VADDR64=1
+echo "$ARCH64STR" | grep "$ARCH" &>/dev/null && VADDR64=1

# Usage: run_test [test binary] [arbitrary test arguments...]
run_test() {
- local title="running $*"
- local sep=$(echo -n "$title" | tr "[:graph:][:space:]" -)
- printf "%s\n%s\n%s\n" "$sep" "$title" "$sep"
-
- "$@"
- local ret=$?
- if [ $ret -eq 0 ]; then
- echo "[PASS]"
- elif [ $ret -eq $ksft_skip ]; then
- echo "[SKIP]"
- exitcode=$ksft_skip
- else
- echo "[FAIL]"
- exitcode=1
- fi
+ if test_selected ${CATEGORY}; then
+ echo "running: $1"
+ local title="running $*"
+ local sep=$(echo -n "$title" | tr "[:graph:][:space:]" -)
+ printf "%s\n%s\n%s\n" "$sep" "$title" "$sep"
+
+ "$@"
+ local ret=$?
+ if [ $ret -eq 0 ]; then
+ echo "[PASS]"
+ elif [ $ret -eq $ksft_skip ]; then
+ echo "[SKIP]"
+ exitcode=$ksft_skip
+ else
+ echo "[FAIL]"
+ exitcode=1
+ fi
+ fi # test_selected
}

-run_test ./hugepage-mmap
+CATEGORY="hugetlb" run_test ./hugepage-mmap

shmmax=$(cat /proc/sys/kernel/shmmax)
shmall=$(cat /proc/sys/kernel/shmall)
echo 268435456 > /proc/sys/kernel/shmmax
echo 4194304 > /proc/sys/kernel/shmall
-run_test ./hugepage-shm
+CATEGORY="hugetlb" run_test ./hugepage-shm
echo "$shmmax" > /proc/sys/kernel/shmmax
echo "$shmall" > /proc/sys/kernel/shmall

-run_test ./map_hugetlb
-run_test ./hugepage-mremap
-run_test ./hugepage-vmemmap
-run_test ./hugetlb-madvise
+CATEGORY="hugetlb" run_test ./map_hugetlb
+CATEGORY="hugetlb" run_test ./hugepage-mremap
+CATEGORY="hugetlb" run_test ./hugepage-vmemmap
+CATEGORY="hugetlb" run_test ./hugetlb-madvise

-echo "NOTE: The above hugetlb tests provide minimal coverage. Use"
-echo " https://github.com/libhugetlbfs/libhugetlbfs.git for"
-echo " hugetlb regression testing."
+if test_selected "hugetlb"; then
+ echo "NOTE: These hugetlb tests provide minimal coverage. Use"
+ echo " https://github.com/libhugetlbfs/libhugetlbfs.git for"
+ echo " hugetlb regression testing."
+fi

-run_test ./map_fixed_noreplace
+CATEGORY="mmap" run_test ./map_fixed_noreplace

# get_user_pages_fast() benchmark
-run_test ./gup_test -u
+CATEGORY="gup_test" run_test ./gup_test -u
# pin_user_pages_fast() benchmark
-run_test ./gup_test -a
+CATEGORY="gup_test" run_test ./gup_test -a
# Dump pages 0, 19, and 4096, using pin_user_pages:
-run_test ./gup_test -ct -F 0x1 0 19 0x1000
+CATEGORY="gup_test" run_test ./gup_test -ct -F 0x1 0 19 0x1000

uffd_mods=("" ":dev")
for mod in "${uffd_mods[@]}"; do
- run_test ./userfaultfd anon${mod} 20 16
+ CATEGORY="userfaultfd" run_test ./userfaultfd anon${mod} 20 16
# Hugetlb tests require source and destination huge pages. Pass in half
# the size ($half_ufd_size_MB), which is used for *each*.
- run_test ./userfaultfd hugetlb${mod} "$half_ufd_size_MB" 32
- run_test ./userfaultfd hugetlb_shared${mod} "$half_ufd_size_MB" 32
- run_test ./userfaultfd shmem${mod} 20 16
+ CATEGORY="userfaultfd" run_test ./userfaultfd hugetlb${mod} "$half_ufd_size_MB" 32
+ CATEGORY="userfaultfd" run_test ./userfaultfd hugetlb_shared${mod} "$half_ufd_size_MB" 32
+ CATEGORY="userfaultfd" run_test ./userfaultfd shmem${mod} 20 16
done

#cleanup
echo "$nr_hugepgs" > /proc/sys/vm/nr_hugepages

-run_test ./compaction_test
+CATEGORY="compaction" run_test ./compaction_test

-run_test sudo -u nobody ./on-fault-limit
+CATEGORY="mlock" run_test sudo -u nobody ./on-fault-limit

-run_test ./map_populate
+CATEGORY="mmap" run_test ./map_populate

-run_test ./mlock-random-test
+CATEGORY="mlock" run_test ./mlock-random-test

-run_test ./mlock2-tests
+CATEGORY="mlock" run_test ./mlock2-tests

-run_test ./mrelease_test
+CATEGORY="process_mrelease" run_test ./mrelease_test

-run_test ./mremap_test
+CATEGORY="mremap" run_test ./mremap_test

-run_test ./thuge-gen
+CATEGORY="hugetlb" run_test ./thuge-gen

if [ $VADDR64 -ne 0 ]; then
- run_test ./virtual_address_range
+ CATEGORY="hugevm" run_test ./virtual_address_range

# virtual address 128TB switch test
- run_test ./va_128TBswitch.sh
+ CATEGORY="hugevm" run_test ./va_128TBswitch.sh
fi # VADDR64

# vmalloc stability smoke test
-run_test ./test_vmalloc.sh smoke
+CATEGORY="vmalloc" run_test ./test_vmalloc.sh smoke

-run_test ./mremap_dontunmap
+CATEGORY="mremap" run_test ./mremap_dontunmap

-run_test ./test_hmm.sh smoke
+CATEGORY="hmm" run_test ./test_hmm.sh smoke

# MADV_POPULATE_READ and MADV_POPULATE_WRITE tests
-run_test ./madv_populate
+CATEGORY="madv_populate" run_test ./madv_populate

-run_test ./memfd_secret
+CATEGORY="memfd_secret" run_test ./memfd_secret

# KSM MADV_MERGEABLE test with 10 identical pages
-run_test ./ksm_tests -M -p 10
+CATEGORY="ksm" run_test ./ksm_tests -M -p 10
# KSM unmerge test
-run_test ./ksm_tests -U
+CATEGORY="ksm" run_test ./ksm_tests -U
# KSM test with 10 zero pages and use_zero_pages = 0
-run_test ./ksm_tests -Z -p 10 -z 0
+CATEGORY="ksm" run_test ./ksm_tests -Z -p 10 -z 0
# KSM test with 10 zero pages and use_zero_pages = 1
-run_test ./ksm_tests -Z -p 10 -z 1
+CATEGORY="ksm" run_test ./ksm_tests -Z -p 10 -z 1
# KSM test with 2 NUMA nodes and merge_across_nodes = 1
-run_test ./ksm_tests -N -m 1
+CATEGORY="ksm_numa" run_test ./ksm_tests -N -m 1
# KSM test with 2 NUMA nodes and merge_across_nodes = 0
-run_test ./ksm_tests -N -m 0
+CATEGORY="ksm_numa" run_test ./ksm_tests -N -m 0

# protection_keys tests
if [ -x ./protection_keys_32 ]
then
- run_test ./protection_keys_32
+ CATEGORY="pkey" run_test ./protection_keys_32
fi

if [ -x ./protection_keys_64 ]
then
- run_test ./protection_keys_64
+ CATEGORY="pkey" run_test ./protection_keys_64
fi

-run_test ./soft-dirty
+CATEGORY="soft_dirty" run_test ./soft-dirty

# COW tests for anonymous memory
-run_test ./anon_cow
+CATEGORY="anon_cow" run_test ./anon_cow

exit $exitcode
--
2.31.1

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