tjh.dev / kernel
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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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>

authored by

Muhammad Usama Anjum and committed by
Andrew Morton 7d695b1c 20a2191c

+7
+4
tools/testing/selftests/mm/charge_reserved_hugetlb.sh
··· 11 11 exit $ksft_skip 12 12 fi 13 13 14 + nr_hugepgs=$(cat /proc/sys/vm/nr_hugepages) 15 + 14 16 fault_limit_file=limit_in_bytes 15 17 reservation_limit_file=rsvd.limit_in_bytes 16 18 fault_usage_file=usage_in_bytes ··· 584 582 umount $cgroup_path 585 583 rmdir $cgroup_path 586 584 fi 585 + 586 + echo "$nr_hugepgs" > /proc/sys/vm/nr_hugepages
+3
tools/testing/selftests/mm/hugetlb_reparenting_test.sh
··· 11 11 exit $ksft_skip 12 12 fi 13 13 14 + nr_hugepgs=$(cat /proc/sys/vm/nr_hugepages) 14 15 usage_file=usage_in_bytes 15 16 16 17 if [[ "$1" == "-cgroup-v2" ]]; then ··· 253 252 umount $CGROUP_ROOT 254 253 rm -rf $CGROUP_ROOT 255 254 fi 255 + 256 + echo "$nr_hugepgs" > /proc/sys/vm/nr_hugepages