perf test case 58 (record+probe_libc_inet_pton.sh)
executed on s390x using kernel 4.16.0rc3
displays this result:
# ./perf trace --no-syscalls
-e probe_libc:inet_pton/call-graph=dwarf/ ping -6 -c 1 ::1
probe_libc:inet_pton: (3ffa0240448)
__GI___inet_pton (/usr/lib64/libc-2.26.so)
gaih_inet (inlined)
__GI_getaddrinfo (inlined)
main (/usr/bin/ping)
__libc_start_main (/usr/lib64/libc-2.26.so)
_start (/usr/bin/ping)
After I installed kernel 4.16.0 the same tests uses
commands
# perf record -e probe_libc:inet_pton/call-graph=dwarf/
-o /tmp/perf.data.abc ping -6 -c 1 ::1
# perf script -i /tmp/perf.data.abc
and displays:
ping 39048 [006] 84230.381198: probe_libc:inet_pton: (3ffa0240448)
140448 __GI___inet_pton (/usr/lib64/libc-2.26.so)
fbde1 gaih_inet (inlined)
fe2b9 __GI_getaddrinfo (inlined)
398d main (/usr/bin/ping)
Nothing else changed including glibc elfutils and other libraries
picked up by the build.
The entries for __libc_start_main and _start are missing.
I bisected missing __libc_start_main and _start to commit
3d20c6246690219881786de10d2dda93f616d0ac
("perf unwind: Unwind with libdw doesn't take symfs into account")
When I undo this commit I get this call stack on s390:
[root@s35lp76 perf]# ./perf script -i /tmp/perf.data.abc
ping 39048 [006] 84230.381198: probe_libc:inet_pton: (3ffa0240448)
140448 __GI___inet_pton (/usr/lib64/libc-2.26.so)
fbde1 gaih_inet (inlined)
fe2b9 __GI_getaddrinfo (inlined)
398d main (/usr/bin/ping)
22fbd __libc_start_main (/usr/lib64/libc-2.26.so)
457b _start (/usr/bin/ping)
Looks like dwarf functions dwfl_xxx create different call back
stack trace when using file
/usr/lib/debug/usr/bin/ping-20161105-7.fc27.s390x.debug instead of
file /usr/bin/ping.
Fix this test case on s390 and do not expect any call back stack
entry after the main() function. Also be more robust and accept a
leading __GI_ prefix in front of getaddrinfo.
On x86 this test case shows the same call stack using
both kernel versions 4.16.0rc3 and 4.16.0 and also
stops at main:
[root@f27 perf]# ./perf script -i /tmp/perf.data.tmr
ping 4446 [000] 172.027088: probe_libc:inet_pton: (7fdfa08c93c0)
1393c0 __GI___inet_pton (/usr/lib64/libc-2.26.so)
fe60d getaddrinfo (/usr/lib64/libc-2.26.so)
2f40 main (/usr/bin/ping)
[root@f27 perf]#
Signed-off-by: Thomas Richter <[email protected]>
Reviewed-by: Hendrik Brueckner <[email protected]>
---
tools/perf/tests/shell/record+probe_libc_inet_pton.sh | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/tools/perf/tests/shell/record+probe_libc_inet_pton.sh b/tools/perf/tests/shell/record+probe_libc_inet_pton.sh
index 1ecc1f0ff84a..016882dbbc16 100755
--- a/tools/perf/tests/shell/record+probe_libc_inet_pton.sh
+++ b/tools/perf/tests/shell/record+probe_libc_inet_pton.sh
@@ -19,12 +19,10 @@ trace_libc_inet_pton_backtrace() {
expected[1]=".*inet_pton[[:space:]]\($libc\)$"
case "$(uname -m)" in
s390x)
- eventattr='call-graph=dwarf'
+ eventattr='call-graph=dwarf,max-stack=4'
expected[2]="gaih_inet.*[[:space:]]\($libc|inlined\)$"
- expected[3]="__GI_getaddrinfo[[:space:]]\($libc|inlined\)$"
+ expected[3]="(__GI_)?getaddrinfo[[:space:]]\($libc|inlined\)$"
expected[4]="main[[:space:]]\(.*/bin/ping.*\)$"
- expected[5]="__libc_start_main[[:space:]]\($libc\)$"
- expected[6]="_start[[:space:]]\(.*/bin/ping.*\)$"
;;
*)
eventattr='max-stack=3'
--
2.14.3
Em Mon, Apr 23, 2018 at 10:24:28AM +0200, Thomas Richter escreveu:
> perf test case 58 (record+probe_libc_inet_pton.sh)
> executed on s390x using kernel 4.16.0rc3
> displays this result:
> # ./perf trace --no-syscalls
> -e probe_libc:inet_pton/call-graph=dwarf/ ping -6 -c 1 ::1
> probe_libc:inet_pton: (3ffa0240448)
> __GI___inet_pton (/usr/lib64/libc-2.26.so)
> gaih_inet (inlined)
> __GI_getaddrinfo (inlined)
> main (/usr/bin/ping)
> __libc_start_main (/usr/lib64/libc-2.26.so)
> _start (/usr/bin/ping)
>
> After I installed kernel 4.16.0 the same tests uses
> commands
> # perf record -e probe_libc:inet_pton/call-graph=dwarf/
> -o /tmp/perf.data.abc ping -6 -c 1 ::1
> # perf script -i /tmp/perf.data.abc
> and displays:
> ping 39048 [006] 84230.381198: probe_libc:inet_pton: (3ffa0240448)
> 140448 __GI___inet_pton (/usr/lib64/libc-2.26.so)
> fbde1 gaih_inet (inlined)
> fe2b9 __GI_getaddrinfo (inlined)
> 398d main (/usr/bin/ping)
>
> Nothing else changed including glibc elfutils and other libraries
> picked up by the build.
> The entries for __libc_start_main and _start are missing.
>
> I bisected missing __libc_start_main and _start to commit
> 3d20c6246690219881786de10d2dda93f616d0ac
> ("perf unwind: Unwind with libdw doesn't take symfs into account")
>
> When I undo this commit I get this call stack on s390:
> [root@s35lp76 perf]# ./perf script -i /tmp/perf.data.abc
> ping 39048 [006] 84230.381198: probe_libc:inet_pton: (3ffa0240448)
> 140448 __GI___inet_pton (/usr/lib64/libc-2.26.so)
> fbde1 gaih_inet (inlined)
> fe2b9 __GI_getaddrinfo (inlined)
> 398d main (/usr/bin/ping)
> 22fbd __libc_start_main (/usr/lib64/libc-2.26.so)
> 457b _start (/usr/bin/ping)
>
> Looks like dwarf functions dwfl_xxx create different call back
> stack trace when using file
> /usr/lib/debug/usr/bin/ping-20161105-7.fc27.s390x.debug instead of
> file /usr/bin/ping.
>
> Fix this test case on s390 and do not expect any call back stack
> entry after the main() function. Also be more robust and accept a
> leading __GI_ prefix in front of getaddrinfo.
>
> On x86 this test case shows the same call stack using
> both kernel versions 4.16.0rc3 and 4.16.0 and also
> stops at main:
Thanks, applied.
Commit-ID: b31a8cc1a53dda3a33b6c9c62779869d4d5fc142
Gitweb: https://git.kernel.org/tip/b31a8cc1a53dda3a33b6c9c62779869d4d5fc142
Author: Thomas Richter <[email protected]>
AuthorDate: Mon, 23 Apr 2018 10:24:28 +0200
Committer: Arnaldo Carvalho de Melo <[email protected]>
CommitDate: Mon, 23 Apr 2018 11:04:37 -0300
perf test: Adapt test case record+probe_libc_inet_pton.sh for s390
perf test case 58 (record+probe_libc_inet_pton.sh) executed on s390x
using kernel 4.16.0rc3 displays this result:
# perf trace --no-syscalls -e probe_libc:inet_pton/call-graph=dwarf/ ping -6 -c 1 ::1
probe_libc:inet_pton: (3ffa0240448)
__GI___inet_pton (/usr/lib64/libc-2.26.so)
gaih_inet (inlined)
__GI_getaddrinfo (inlined)
main (/usr/bin/ping)
__libc_start_main (/usr/lib64/libc-2.26.so)
_start (/usr/bin/ping)
After I installed kernel 4.16.0 the same tests uses commands:
# perf record -e probe_libc:inet_pton/call-graph=dwarf/
-o /tmp/perf.data.abc ping -6 -c 1 ::1
# perf script -i /tmp/perf.data.abc
and displays:
ping 39048 [006] 84230.381198: probe_libc:inet_pton: (3ffa0240448)
140448 __GI___inet_pton (/usr/lib64/libc-2.26.so)
fbde1 gaih_inet (inlined)
fe2b9 __GI_getaddrinfo (inlined)
398d main (/usr/bin/ping)
Nothing else changed including glibc elfutils and other libraries picked
up by the build.
The entries for __libc_start_main and _start are missing.
I bisected missing __libc_start_main and _start to commit
Fixes: 3d20c6246690 ("perf unwind: Unwind with libdw doesn't take symfs into account")
When I undo this commit I get this call stack on s390:
[root@s35lp76 perf]# ./perf script -i /tmp/perf.data.abc
ping 39048 [006] 84230.381198: probe_libc:inet_pton: (3ffa0240448)
140448 __GI___inet_pton (/usr/lib64/libc-2.26.so)
fbde1 gaih_inet (inlined)
fe2b9 __GI_getaddrinfo (inlined)
398d main (/usr/bin/ping)
22fbd __libc_start_main (/usr/lib64/libc-2.26.so)
457b _start (/usr/bin/ping)
Looks like dwarf functions dwfl_xxx create different call back stack
trace when using file /usr/lib/debug/usr/bin/ping-20161105-7.fc27.s390x.debug
instead of file /usr/bin/ping.
Fix this test case on s390 and do not expect any call back stack entry
after the main() function. Also be more robust and accept a leading
__GI_ prefix in front of getaddrinfo.
On x86 this test case shows the same call stack using both kernel
versions 4.16.0rc3 and 4.16.0 and also stops at main:
[root@f27 perf]# ./perf script -i /tmp/perf.data.tmr
ping 4446 [000] 172.027088: probe_libc:inet_pton: (7fdfa08c93c0)
1393c0 __GI___inet_pton (/usr/lib64/libc-2.26.so)
fe60d getaddrinfo (/usr/lib64/libc-2.26.so)
2f40 main (/usr/bin/ping)
[root@f27 perf]#
Signed-off-by: Thomas Richter <[email protected]>
Reviewed-by: Hendrik Brueckner <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: Martin Schwidefsky <[email protected]>
Cc: Martin Vuille <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
---
tools/perf/tests/shell/record+probe_libc_inet_pton.sh | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/tools/perf/tests/shell/record+probe_libc_inet_pton.sh b/tools/perf/tests/shell/record+probe_libc_inet_pton.sh
index 1ecc1f0ff84a..016882dbbc16 100755
--- a/tools/perf/tests/shell/record+probe_libc_inet_pton.sh
+++ b/tools/perf/tests/shell/record+probe_libc_inet_pton.sh
@@ -19,12 +19,10 @@ trace_libc_inet_pton_backtrace() {
expected[1]=".*inet_pton[[:space:]]\($libc\)$"
case "$(uname -m)" in
s390x)
- eventattr='call-graph=dwarf'
+ eventattr='call-graph=dwarf,max-stack=4'
expected[2]="gaih_inet.*[[:space:]]\($libc|inlined\)$"
- expected[3]="__GI_getaddrinfo[[:space:]]\($libc|inlined\)$"
+ expected[3]="(__GI_)?getaddrinfo[[:space:]]\($libc|inlined\)$"
expected[4]="main[[:space:]]\(.*/bin/ping.*\)$"
- expected[5]="__libc_start_main[[:space:]]\($libc\)$"
- expected[6]="_start[[:space:]]\(.*/bin/ping.*\)$"
;;
*)
eventattr='max-stack=3'