perf test shell: Use a fallback to get the pathname in vfs_getname

Some kernels, like 4.19.13-300.fc29.x86_64 in fedora 29, fail with the
existing probe definition asking for the contents of result->name,
working when we ask for the 'filename' variable instead, so add a
fallback to that.

Now those tests are back working on fedora 29 systems with that kernel:

  # perf test vfs_getname
  65: Use vfs_getname probe to get syscall args filenames   : Ok
  66: Add vfs_getname probe to get syscall args filenames   : Ok
  67: Check open filename arg using perf trace + vfs_getname: Ok
  #

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-klt3n0i58dfqttveti09q3fi@git.kernel.orgSigned-off-by: 's avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent f712a86c
......@@ -13,7 +13,8 @@ add_probe_vfs_getname() {
local verbose=$1
if [ $had_vfs_getname -eq 1 ] ; then
line=$(perf probe -L getname_flags 2>&1 | egrep 'result.*=.*filename;' | sed -r 's/[[:space:]]+([[:digit:]]+)[[:space:]]+result->uptr.*/\1/')
perf probe $verbose "vfs_getname=getname_flags:${line} pathname=result->name:string"
perf probe -q "vfs_getname=getname_flags:${line} pathname=result->name:string" || \
perf probe $verbose "vfs_getname=getname_flags:${line} pathname=filename:string"
fi
}
......
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