tools/perf/tests/shell/trace+probe_vfs_getname.sh

   1 # Check open filename arg using perf trace + vfs_getname
   2
   3 # Uses the 'perf test shell' library to add probe:vfs_getname to the system
   4 # then use it with 'perf trace' using 'touch' to write to a temp file, then
   5 # checks that that was captured by the vfs_getname was used by 'perf trace',
   6 # that already handles "probe:vfs_getname" if present, and used in the
   7 # "open" syscall "filename" argument beautifier.
   8
   9 # Arnaldo Carvalho de Melo <acme@kernel.org>, 2017
  10
  11 . $(dirname $0)/lib/probe.sh
  12
  13 skip_if_no_perf_probe || exit 2
  14
  15 . $(dirname $0)/lib/probe_vfs_getname.sh
  16
  17 file=$(mktemp /tmp/temporary_file.XXXXX)
  18
  19 trace_open_vfs_getname() {
  20         evts=$(echo $(perf list syscalls:sys_enter_open* |& egrep 'open(at)? ' | sed -r 's/.*sys_enter_([a-z]+) +\[.*$/\1/') | sed 's/ /,/')
  21         perf trace -e $evts touch $file 2>&1 | \
  22         egrep " +[0-9]+\.[0-9]+ +\( +[0-9]+\.[0-9]+ ms\): +touch\/[0-9]+ open(at)?\((dfd: +CWD, +)?filename: +${file}, +flags: CREAT\|NOCTTY\|NONBLOCK\|WRONLY, +mode: +IRUGO\|IWUGO\) += +[0-9]+$"
  23 }
  24
  25
  26 add_probe_vfs_getname || skip_if_no_debuginfo
  27 err=$?
  28 if [ $err -ne 0 ] ; then
  29         exit $err
  30 fi
  31
  32 trace_open_vfs_getname
  33 err=$?
  34 rm -f ${file}
  35 cleanup_probe_vfs_getname
  36 exit $err