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

   1 #!/bin/sh
   2 # Check open filename arg using perf trace + vfs_getname (exclusive)
   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 # shellcheck source=lib/probe.sh
  14 . "$(dirname $0)"/lib/probe.sh
  15
  16 skip_if_no_perf_probe || exit 2
  17 skip_if_no_perf_trace || exit 2
  18
  19 . "$(dirname $0)"/lib/probe_vfs_getname.sh
  20
  21 trace_open_vfs_getname() {
  22         evts="$(echo "$(perf list tracepoint 2>/dev/null | grep -E 'syscalls:sys_enter_open(at)? ' | sed -r 's/.*sys_enter_([a-z]+) +\[.*$/\1/')" | sed ':a;N;s:\n:,:g')"
  23         perf trace -e $evts touch $file 2>&1 | \
  24         grep -E " +[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]+$"
  25 }
  26
  27
  28 add_probe_vfs_getname || skip_if_no_debuginfo
  29 err=$?
  30 if [ $err -ne 0 ] ; then
  31         exit $err
  32 fi
  33
  34 file=$(mktemp /tmp/temporary_file.XXXXX)
  35
  36 # Do not use whatever ~/.perfconfig file, it may change the output
  37 # via trace.{show_timestamp,show_prefix,etc}
  38 export PERF_CONFIG=/dev/null
  39
  40 trace_open_vfs_getname
  41 err=$?
  42 rm -f ${file}
  43 cleanup_probe_vfs_getname
  44 exit $err