From 8fc375d7d36c72b4c2d55f5c24be022a939295d4 Mon Sep 17 00:00:00 2001 From: Arnaldo Carvalho de Melo Date: Thu, 10 Aug 2017 14:50:49 -0300 Subject: perf test shell: Add uprobes + backtrace ping test Installs a probe on libc's inet_pton function, that will use uprobes, then use 'perf trace' on a ping to localhost asking for just one packet with the a backtrace 3 levels deep, check that it is what we expect. This needs no debuginfo package, all is done using the libc ELF symtab and the CFI info in the binaries. Testing it: # perf test ping 61: probe libc's inet_pton & backtrace it with ping : Ok In verbose mode: # perf test -v ping 61: probe libc's inet_pton & backtrace it with ping : --- start --- test child forked, pid 1007 PING ::1(::1) 56 data bytes 64 bytes from ::1: icmp_seq=1 ttl=64 time=0.058 ms --- ::1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.058/0.058/0.058/0.000 ms 0.000 probe_libc:inet_pton:(7f75fce12a20)) __GI___inet_pton (/usr/lib64/libc-2.24.so) getaddrinfo (/usr/lib64/libc-2.24.so) _init (/usr/bin/ping) test child finished with 0 ---- end ---- probe libc's inet_pton & backtrace it with ping: Ok # Cc: Adrian Hunter Cc: David Ahern Cc: Jiri Olsa Cc: Michael Petlan Cc: Namhyung Kim Cc: Thomas Richter Cc: Wang Nan Link: http://lkml.kernel.org/n/tip-idrntt4nbg15aafu8hjmv7sk@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- .../perf/tests/shell/trace+probe_libc_inet_pton.sh | 40 ++++++++++++++++++++++ 1 file changed, 40 insertions(+) create mode 100755 tools/perf/tests/shell/trace+probe_libc_inet_pton.sh (limited to 'tools/perf/tests/shell') diff --git a/tools/perf/tests/shell/trace+probe_libc_inet_pton.sh b/tools/perf/tests/shell/trace+probe_libc_inet_pton.sh new file mode 100755 index 000000000000..1b9a276e2ace --- /dev/null +++ b/tools/perf/tests/shell/trace+probe_libc_inet_pton.sh @@ -0,0 +1,40 @@ +# probe libc's inet_pton & backtrace it with ping + +# Installs a probe on libc's inet_pton function, that will use uprobes, +# then use 'perf trace' on a ping to localhost asking for just one packet +# with the a backtrace 3 levels deep, check that it is what we expect. +# This needs no debuginfo package, all is done using the libc ELF symtab +# and the CFI info in the binaries. + +# Arnaldo Carvalho de Melo , 2017 + +trace_libc_inet_pton_backtrace() { + idx=0 + expected[0]="PING.*bytes" + expected[1]="64 bytes from ::1.*" + expected[2]=".*ping statistics.*" + expected[3]=".*packets transmitted.*" + expected[4]="rtt min.*" + expected[5]="[0-9]+\.[0-9]+[[:space:]]+probe_libc:inet_pton:\([[:xdigit:]]+\)" + expected[6]=".*inet_pton[[:space:]]\(/usr/lib.*/libc-[0-9]+\.[0-9]+\.so\)$" + expected[7]="getaddrinfo[[:space:]]\(/usr/lib.*/libc-[0-9]+\.[0-9]+\.so\)$" + expected[8]=".*\(.*/bin/ping.*\)$" + + perf trace --no-syscalls -e probe_libc:inet_pton/max-stack=3/ ping -6 -c 1 ::1 |& grep -v ^$ | while read line ; do + echo $line + echo "$line" | egrep -q "${expected[$idx]}" + if [ $? -ne 0 ] ; then + printf "FAIL: expected backtrace entry %d \"%s\" got \"%s\"\n" $idx "${expected[$idx]}" "$line" + exit 1 + fi + let idx+=1 + [ $idx -eq 9 ] && break + done +} + +perf probe -q /lib64/libc-*.so inet_pton && \ +trace_libc_inet_pton_backtrace +err=$? +rm -f ${file} +perf probe -q -d probe_libc:inet_pton +exit $err -- cgit v1.2.3