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| author | Muhammad Usama Anjum <usama.anjum@collabora.com> | 2024-01-25 18:46:06 +0300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2024-02-23 02:38:55 +0300 |
| commit | 7d695b1c3695b4d0417674f15e2ccde12a272e16 (patch) | |
| tree | b65bbad9820c4dc3d53031697e8dfe015579c95e | |
| parent | 20a2191c2ef35d58aebed704ecf8f31ff959b412 (diff) | |
| download | linux-7d695b1c3695b4d0417674f15e2ccde12a272e16.tar.xz | |
selftests/mm: save and restore nr_hugepages value
Save and restore nr_hugepages before changing it during the test. A test
should not change system wide settings.
Link: https://lkml.kernel.org/r/20240125154608.720072-4-usama.anjum@collabora.com
Signed-off-by: Muhammad Usama Anjum <usama.anjum@collabora.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
| -rwxr-xr-x | tools/testing/selftests/mm/charge_reserved_hugetlb.sh | 4 | ||||
| -rwxr-xr-x | tools/testing/selftests/mm/hugetlb_reparenting_test.sh | 3 |
2 files changed, 7 insertions, 0 deletions
diff --git a/tools/testing/selftests/mm/charge_reserved_hugetlb.sh b/tools/testing/selftests/mm/charge_reserved_hugetlb.sh index e14bdd4455f2..d680c00d2853 100755 --- a/tools/testing/selftests/mm/charge_reserved_hugetlb.sh +++ b/tools/testing/selftests/mm/charge_reserved_hugetlb.sh @@ -11,6 +11,8 @@ if [[ $(id -u) -ne 0 ]]; then exit $ksft_skip fi +nr_hugepgs=$(cat /proc/sys/vm/nr_hugepages) + fault_limit_file=limit_in_bytes reservation_limit_file=rsvd.limit_in_bytes fault_usage_file=usage_in_bytes @@ -582,3 +584,5 @@ if [[ $do_umount ]]; then umount $cgroup_path rmdir $cgroup_path fi + +echo "$nr_hugepgs" > /proc/sys/vm/nr_hugepages diff --git a/tools/testing/selftests/mm/hugetlb_reparenting_test.sh b/tools/testing/selftests/mm/hugetlb_reparenting_test.sh index 615c4d766c90..11f9bbe7dc22 100755 --- a/tools/testing/selftests/mm/hugetlb_reparenting_test.sh +++ b/tools/testing/selftests/mm/hugetlb_reparenting_test.sh @@ -11,6 +11,7 @@ if [[ $(id -u) -ne 0 ]]; then exit $ksft_skip fi +nr_hugepgs=$(cat /proc/sys/vm/nr_hugepages) usage_file=usage_in_bytes if [[ "$1" == "-cgroup-v2" ]]; then @@ -252,3 +253,5 @@ if [[ $do_umount ]]; then umount $CGROUP_ROOT rm -rf $CGROUP_ROOT fi + +echo "$nr_hugepgs" > /proc/sys/vm/nr_hugepages |