tools/testing/selftests/damon/sysfs_update_removed_scheme_dir.sh

   1 #!/bin/bash
   2 # SPDX-License-Identifier: GPL-2.0
   3
   4 # Kselftest framework requirement - SKIP code is 4.
   5 ksft_skip=4
   6
   7 if [ $EUID -ne 0 ]
   8 then
   9         echo "Run as root"
  10         exit $ksft_skip
  11 fi
  12
  13 damon_sysfs="/sys/kernel/mm/damon/admin"
  14 if [ ! -d "$damon_sysfs" ]
  15 then
  16         echo "damon sysfs not found"
  17         exit $ksft_skip
  18 fi
  19
  20 # clear log
  21 dmesg -C
  22
  23 # start DAMON with a scheme
  24 echo 1 > "$damon_sysfs/kdamonds/nr_kdamonds"
  25 echo 1 > "$damon_sysfs/kdamonds/0/contexts/nr_contexts"
  26 echo "vaddr" > "$damon_sysfs/kdamonds/0/contexts/0/operations"
  27 echo 1 > "$damon_sysfs/kdamonds/0/contexts/0/targets/nr_targets"
  28 echo $$ > "$damon_sysfs/kdamonds/0/contexts/0/targets/0/pid_target"
  29 echo 1 > "$damon_sysfs/kdamonds/0/contexts/0/schemes/nr_schemes"
  30 scheme_dir="$damon_sysfs/kdamonds/0/contexts/0/schemes/0"
  31 echo 4096000 > "$scheme_dir/access_pattern/sz/max"
  32 echo 20 > "$scheme_dir/access_pattern/nr_accesses/max"
  33 echo 1024 > "$scheme_dir/access_pattern/age/max"
  34 echo "on" > "$damon_sysfs/kdamonds/0/state"
  35 sleep 0.3
  36
  37 # remove scheme sysfs dir
  38 echo 0 > "$damon_sysfs/kdamonds/0/contexts/0/schemes/nr_schemes"
  39
  40 # try to update stat of already removed scheme sysfs dir
  41 echo "update_schemes_stats" > "$damon_sysfs/kdamonds/0/state"
  42 if dmesg | grep -q BUG
  43 then
  44         echo "update_schemes_stats triggers a kernel bug"
  45         dmesg
  46         exit 1
  47 fi
  48
  49 # try to update tried regions of already removed scheme sysfs dir
  50 echo "update_schemes_tried_regions" > "$damon_sysfs/kdamonds/0/state"
  51 if dmesg | grep -q BUG
  52 then
  53         echo "update_schemes_tried_regions triggers a kernel bug"
  54         dmesg
  55         exit 1
  56 fi
  57
  58 echo "off" > "$damon_sysfs/kdamonds/0/state"