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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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On Intel test case trace+probe_libc_inet_pton.sh succeeds and the output is: [root@f27 perf]# ./perf trace --no-syscalls -e probe_libc:inet_pton/max-stack=3/ ping -6 -c 1 ::1 PING ::1(::1) 56 data bytes 64 bytes from ::1: icmp_seq=1 ttl=64 time=0.037 ms --- ::1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.037/0.037/0.037/0.000 ms 0.000 probe_libc:inet_pton:(7fa40ac618a0)) __GI___inet_pton (/usr/lib64/libc-2.26.so) getaddrinfo (/usr/lib64/libc-2.26.so) main (/usr/bin/ping) The kernel stack unwinder is used, it is specified implicitly as call-graph=fp (frame pointer). On s390x only dwarf is available for stack unwinding. It is also done in user space. This requires different parameter setup and result checking for s390x and Intel. This patch adds separate perf trace setup and result checking for Intel and s390x. On s390x specify this command line to get a call-graph and handle the different call graph result checking: [root@s35lp76 perf]# ./perf trace --no-syscalls -e probe_libc:inet_pton/call-graph=dwarf/ ping -6 -c 1 ::1 PING ::1(::1) 56 data bytes 64 bytes from ::1: icmp_seq=1 ttl=64 time=0.041 ms --- ::1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.041/0.041/0.041/0.000 ms 0.000 probe_libc:inet_pton:(3ffb9942060)) __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) [root@s35lp76 perf]# Before: [root@s8360047 perf]# ./perf test -vv 58 58: probe libc's inet_pton & backtrace it with ping : --- start --- test child forked, pid 26349 PING ::1(::1) 56 data bytes 64 bytes from ::1: icmp_seq=1 ttl=64 time=0.079 ms --- ::1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.079/0.079/0.079/0.000 ms 0.000 probe_libc:inet_pton:(3ff925c2060)) test child finished with -1 ---- end ---- probe libc's inet_pton & backtrace it with ping: FAILED! [root@s8360047 perf]# After: [root@s35lp76 perf]# ./perf test -vv 57 57: probe libc's inet_pton & backtrace it with ping : --- start --- test child forked, pid 38708 PING ::1(::1) 56 data bytes 64 bytes from ::1: icmp_seq=1 ttl=64 time=0.038 ms --- ::1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.038/0.038/0.038/0.000 ms 0.000 probe_libc:inet_pton:(3ff87342060)) __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) test child finished with 0 ---- end ---- probe libc's inet_pton & backtrace it with ping: Ok [root@s35lp76 perf]# On Intel the test case runs unchanged and succeeds. Signed-off-by: Thomas Richter <tmricht@linux.vnet.ibm.com> Reviewed-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Link: http://lkml.kernel.org/r/20180117083831.101001-1-tmricht@linux.vnet.ibm.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> |
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.. | ||
attr | ||
shell | ||
.gitignore | ||
attr.c | ||
attr.py | ||
backward-ring-buffer.c | ||
bitmap.c | ||
bp_signal_overflow.c | ||
bp_signal.c | ||
bpf-script-example.c | ||
bpf-script-test-kbuild.c | ||
bpf-script-test-prologue.c | ||
bpf-script-test-relocation.c | ||
bpf.c | ||
Build | ||
builtin-test.c | ||
clang.c | ||
code-reading.c | ||
cpumap.c | ||
dso-data.c | ||
dwarf-unwind.c | ||
event_update.c | ||
event-times.c | ||
evsel-roundtrip-name.c | ||
evsel-tp-sched.c | ||
expr.c | ||
fdarray.c | ||
hists_common.c | ||
hists_common.h | ||
hists_cumulate.c | ||
hists_filter.c | ||
hists_link.c | ||
hists_output.c | ||
is_printable_array.c | ||
keep-tracking.c | ||
kmod-path.c | ||
llvm.c | ||
llvm.h | ||
make | ||
mem.c | ||
mmap-basic.c | ||
mmap-thread-lookup.c | ||
openat-syscall-all-cpus.c | ||
openat-syscall-tp-fields.c | ||
openat-syscall.c | ||
parse-events.c | ||
parse-no-sample-id-all.c | ||
perf-hooks.c | ||
perf-record.c | ||
perf-targz-src-pkg | ||
pmu.c | ||
python-use.c | ||
sample-parsing.c | ||
sdt.c | ||
stat.c | ||
sw-clock.c | ||
switch-tracking.c | ||
task-exit.c | ||
tests.h | ||
thread-map.c | ||
thread-mg-share.c | ||
topology.c | ||
unit_number__scnprintf.c | ||
vmlinux-kallsyms.c |