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

   1 #!/bin/sh
   2 # Check open filename arg using perf trace + vfs_getname
   3
   4 # Uses the 'perf test shell' library to add probe:vfs_getname to the system
   5 # then use it with 'perf trace' using 'touch' to write to a temp file, then
   6 # checks that that was captured by the vfs_getname was used by 'perf trace',
   7 # that already handles "probe:vfs_getname" if present, and used in the
   8 # "open" syscall "filename" argument beautifier.
   9
  10 # SPDX-License-Identifier: GPL-2.0
  11 # Arnaldo Carvalho de Melo <acme@kernel.org>, 2017
  12
  13 . $(dirname $0)/lib/probe.sh
  14
  15 skip_if_no_perf_probe || exit 2
  16 skip_if_no_perf_trace || exit 2
  17
  18 . $(dirname $0)/lib/probe_vfs_getname.sh
  19
  20 file=$(mktemp /tmp/temporary_file.XXXXX)
  21
  22 trace_open_vfs_getname() {
  23         evts=$(echo $(perf list syscalls:sys_enter_open* 2>&1 | egrep 'open(at)? ' | sed -r 's/.*sys_enter_([a-z]+) +\[.*$/\1/') | sed 's/ /,/')
  24         perf trace -e $evts touch $file 2>&1 | \
  25         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]+$"
  26 }
  27
  28
  29 add_probe_vfs_getname || skip_if_no_debuginfo
  30 err=$?
  31 if [ $err -ne 0 ] ; then
  32         exit $err
  33 fi
  34
  35 # Do not use whatever ~/.perfconfig file, it may change the output
  36 # via trace.{show_timestamp,show_prefix,etc}
  37 export PERF_CONFIG=/dev/null
  38
  39 trace_open_vfs_getname
  40 err=$?
  41 rm -f ${file}
  42 cleanup_probe_vfs_getname
  43 exit $err