linux/tools/perf/tests/shell/lib/probe_vfs_getname.sh
Athira Rajeev 766b0beedb perf tests shell: Fix check for libtracevent support
Test “Use vfs_getname probe to get syscall args filenames” fails in
environment with missing libtraceevent support as below:

  82: Use vfs_getname probe to get syscall args filenames             :
  --- start ---
  test child forked, pid 304726
  Recording open file:
  event syntax error: 'probe:vfs_getname*'
                       \___ unsupported tracepoint

  libtraceevent is necessary for tracepoint support
  Run 'perf list' for a list of valid events

   Usage: perf record [<options>] [<command>]
      or: perf record [<options>] -- <command> [<options>]

      -e, --event <event>   event selector. use 'perf list' to list available events
  test child finished with -1
  ---- end ----
  Use vfs_getname probe to get syscall args filenames: FAILED!

The environment has debuginfo but is missing the libtraceevent devel.

Hence perf is compiled without libtraceevent support.  The test tries to
add probe “probe:vfs_getname” and then uses it with “perf record”.  This
fails at function “parse_events_add_tracepoint" due to missing
libtraceevent.

Similarly "probe libc's inet_pton & backtrace it with ping" test slso
fails with same reason.

Add a function in 'perf test shell' library to check if perf record with
—dry-run reports any error on missing support for libtraceevent. Update
both the tests to use this new function “skip_no_probe_record_support”
before proceeding With using probe point via perf builtin record.

With the change,

  82: Use vfs_getname probe to get syscall args filenames             :
  --- start ---
  test child forked, pid 305014
  Recording open file:
  libtraceevent is necessary for tracepoint support
  test child finished with -2
  ---- end ----
  Use vfs_getname probe to get syscall args filenames: Skip

   81: probe libc's inet_pton & backtrace it with ping                 :
  --- start ---
  test child forked, pid 305036
  libtraceevent is necessary for tracepoint support
  test child finished with -2
  ---- end ----
  probe libc's inet_pton & backtrace it with ping: Skip

Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Disha Goel <disgoel@linux.ibm.com>
Cc: Ian Rogers <irogers@google.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nageswara R Sastry <rnsastry@linux.ibm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: kjain@linux.ibm.com,
Cc: linuxppc-dev@lists.ozlabs.org
Link: http://lore.kernel.org/r/20230201180421.59640-2-atrajeev@linux.vnet.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2023-02-01 21:44:26 -03:00

33 lines
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# Arnaldo Carvalho de Melo <acme@kernel.org>, 2017
perf probe -l 2>&1 | grep -q probe:vfs_getname
had_vfs_getname=$?
cleanup_probe_vfs_getname() {
if [ $had_vfs_getname -eq 1 ] ; then
perf probe -q -d probe:vfs_getname*
fi
}
add_probe_vfs_getname() {
local verbose=$1
if [ $had_vfs_getname -eq 1 ] ; then
line=$(perf probe -L getname_flags 2>&1 | grep -E 'result.*=.*filename;' | sed -r 's/[[:space:]]+([[:digit:]]+)[[:space:]]+result->uptr.*/\1/')
perf probe -q "vfs_getname=getname_flags:${line} pathname=result->name:string" || \
perf probe $verbose "vfs_getname=getname_flags:${line} pathname=filename:ustring"
fi
}
skip_if_no_debuginfo() {
add_probe_vfs_getname -v 2>&1 | grep -E -q "^(Failed to find the path for the kernel|Debuginfo-analysis is not supported)|(file has no debug information)" && return 2
return 1
}
# check if perf is compiled with libtraceevent support
skip_no_probe_record_support() {
if [ $had_vfs_getname -eq 1 ] ; then
perf record --dry-run -e $1 2>&1 | grep "libtraceevent is necessary for tracepoint support" && return 2
return 1
fi
}