Commit 7d695b1c authored Jan 25, 2024 by Muhammad Usama Anjum Committed by Andrew Morton Feb 22, 2024

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>

parent 20a2191c

tools/testing/selftests/mm/charge_reserved_hugetlb.sh

+4 −0

Original line number	Diff line number	Diff line
		@@ -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

tools/testing/selftests/mm/hugetlb_reparenting_test.sh

+3 −0

Original line number	Diff line number	Diff line
		@@ -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