tools/testing/selftests/memfd/run_hugetlbfs_test.sh

   1 #!/bin/bash
   2 # please run as root
   3
   4 # Kselftest framework requirement - SKIP code is 4.
   5 ksft_skip=4
   6
   7 #
   8 # To test memfd_create with hugetlbfs, there needs to be hpages_test
   9 # huge pages free.  Attempt to allocate enough pages to test.
  10 #
  11 hpages_test=8
  12
  13 #
  14 # Get count of free huge pages from /proc/meminfo
  15 #
  16 while read name size unit; do
  17         if [ "$name" = "HugePages_Free:" ]; then
  18                 freepgs=$size
  19         fi
  20 done < /proc/meminfo
  21
  22 #
  23 # If not enough free huge pages for test, attempt to increase
  24 #
  25 if [ -n "$freepgs" ] && [ $freepgs -lt $hpages_test ]; then
  26         nr_hugepgs=`cat /proc/sys/vm/nr_hugepages`
  27         hpages_needed=`expr $hpages_test - $freepgs`
  28
  29         if [ $UID != 0 ]; then
  30                 echo "Please run memfd with hugetlbfs test as root"
  31                 exit $ksft_skip
  32         fi
  33
  34         echo 3 > /proc/sys/vm/drop_caches
  35         echo $(( $hpages_needed + $nr_hugepgs )) > /proc/sys/vm/nr_hugepages
  36         while read name size unit; do
  37                 if [ "$name" = "HugePages_Free:" ]; then
  38                         freepgs=$size
  39                 fi
  40         done < /proc/meminfo
  41 fi
  42
  43 #
  44 # If still not enough huge pages available, exit.  But, give back any huge
  45 # pages potentially allocated above.
  46 #
  47 if [ $freepgs -lt $hpages_test ]; then
  48         # nr_hugepgs non-zero only if we attempted to increase
  49         if [ -n "$nr_hugepgs" ]; then
  50                 echo $nr_hugepgs > /proc/sys/vm/nr_hugepages
  51         fi
  52         printf "Not enough huge pages available (%d < %d)\n" \
  53                 $freepgs $needpgs
  54         exit $ksft_skip
  55 fi
  56
  57 #
  58 # Run the hugetlbfs test
  59 #
  60 ./memfd_test hugetlbfs
  61 ./run_fuse_test.sh hugetlbfs
  62
  63 #
  64 # Give back any huge pages allocated for the test
  65 #
  66 if [ -n "$nr_hugepgs" ]; then
  67         echo $nr_hugepgs > /proc/sys/vm/nr_hugepages
  68 fi