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author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2017-08-04 14:39:37 -0300 |
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committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2017-08-11 16:06:30 -0300 |
commit | 6060c7264ded3f6fa17e74bca3e192ce477e8063 (patch) | |
tree | cd049cecdc90f308c9fab5459ba772355ed56f5b /tools/perf/tests | |
parent | 5ce669a59503f7c05c4648c70fe72bbe42613743 (diff) | |
download | op-kernel-dev-6060c7264ded3f6fa17e74bca3e192ce477e8063.zip op-kernel-dev-6060c7264ded3f6fa17e74bca3e192ce477e8063.tar.gz |
perf test shell: Add test using probe:vfs_getname and verifying results
This test uses the 'perf test shell' library to add probe:vfs_getname to the
system then use it with 'perf record' using 'touch' to write to a temp file,
then checks that that was captured by the vfs_getname probe in the generated
perf.data file, with the temp file name as the pathname argument.
Using it:
# perf test "Use vfs_getname"
60: Use vfs_getname probe to get syscall args filenames: Ok
# perf test -v "Use vfs_getname"
60: Use vfs_getname probe to get syscall args filenames:
--- start ---
test child forked, pid 16414
Added new event:
probe:vfs_getname (on getname_flags:72 with pathname=result->name:string)
You can now use it in all perf tools, such as:
perf record -e probe:vfs_getname -aR sleep 1
Recording open file:
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.022 MB /tmp/vaca.perf.data.QZsn7 (13 samples) ]
Looking at perf.data file for vfs_getname records for the file we touched:
touch 16421 [002] 1255152.879561: probe:vfs_getname: (ffffffffa626e608) pathname="/tmp/vaca.l10SL"
test child finished with 0
---- end ----
Use vfs_getname probe to get syscall args filenames: Ok
#
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Thomas Richter <tmricht@linux.vnet.ibm.com>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-t555fnhbcbxnukltk23dqxur@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/tests')
-rwxr-xr-x | tools/perf/tests/shell/record+script_probe_vfs_getname.sh | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/tools/perf/tests/shell/record+script_probe_vfs_getname.sh b/tools/perf/tests/shell/record+script_probe_vfs_getname.sh new file mode 100755 index 0000000..2725c5d --- /dev/null +++ b/tools/perf/tests/shell/record+script_probe_vfs_getname.sh @@ -0,0 +1,37 @@ +# Use vfs_getname probe to get syscall args filenames + +# Uses the 'perf test shell' library to add probe:vfs_getname to the system +# then use it with 'perf record' using 'touch' to write to a temp file, then +# checks that that was captured by the vfs_getname probe in the generated +# perf.data file, with the temp file name as the pathname argument. + +# Arnaldo Carvalho de Melo <acme@kernel.org>, 2017 + +. $(dirname $0)/lib/probe_vfs_getname.sh + +perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX) +file=$(mktemp /tmp/temporary_file.XXXXX) + +record_open_file() { + echo "Recording open file:" + perf record -o ${perfdata} -e probe:vfs_getname touch $file +} + +perf_script_filenames() { + echo "Looking at perf.data file for vfs_getname records for the file we touched:" + perf script -i ${perfdata} | \ + egrep " +touch +[0-9]+ +\[[0-9]+\] +[0-9]+\.[0-9]+: +probe:vfs_getname: +\([[:xdigit:]]+\) +pathname=\"${file}\"" +} + +add_probe_vfs_getname || skip_if_no_debuginfo +err=$? +if [ $err -ne 0 ] ; then + exit $err +fi + +record_open_file && perf_script_filenames +err=$? +rm -f ${perfdata} +rm -f ${file} +cleanup_probe_vfs_getname +exit $err |