tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#!/bin/sh
2# Arnaldo Carvalho de Melo <acme@kernel.org>, 2017
3
4perf probe -l 2>&1 | grep -q probe:vfs_getname
5had_vfs_getname=$?
6
7cleanup_probe_vfs_getname() {
8 if [ $had_vfs_getname -eq 1 ] ; then
9 perf probe -q -d probe:vfs_getname*
10 fi
11}
12
13add_probe_vfs_getname() {
14 add_probe_verbose=$1
15 if [ $had_vfs_getname -eq 1 ] ; then
16 result_initname_re="[[:space:]]+([[:digit:]]+)[[:space:]]+initname.*"
17 line=$(perf probe -L getname_flags 2>&1 | grep -E "$result_initname_re" | sed -r "s/$result_initname_re/\1/")
18
19 # Search the old regular expressions so that this will
20 # pass on older kernels as well.
21 if [ -z "$line" ] ; then
22 result_filename_re="[[:space:]]+([[:digit:]]+)[[:space:]]+result->uptr.*"
23 line=$(perf probe -L getname_flags 2>&1 | grep -E "$result_filename_re" | sed -r "s/$result_filename_re/\1/")
24 fi
25
26 if [ -z "$line" ] ; then
27 result_aname_re="[[:space:]]+([[:digit:]]+)[[:space:]]+result->aname = NULL;"
28 line=$(perf probe -L getname_flags 2>&1 | grep -E "$result_aname_re" | sed -r "s/$result_aname_re/\1/")
29 fi
30
31 if [ -z "$line" ] ; then
32 echo "Could not find probeable line"
33 return 2
34 fi
35
36 perf probe -q "vfs_getname=getname_flags:${line} pathname=result->name:string" || \
37 perf probe $add_probe_verbose "vfs_getname=getname_flags:${line} pathname=filename:ustring" || return 1
38 fi
39}
40
41skip_if_no_debuginfo() {
42 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
43 return 1
44}
45
46# check if perf is compiled with libtraceevent support
47skip_no_probe_record_support() {
48 if [ $had_vfs_getname -eq 1 ] ; then
49 perf check feature -q libtraceevent && return 1
50 return 2
51 fi
52}