diff options
Diffstat (limited to 'tools/perf/tests/shell/record+probe_libc_inet_pton.sh')
| -rwxr-xr-x | tools/perf/tests/shell/record+probe_libc_inet_pton.sh | 96 |
1 files changed, 96 insertions, 0 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 new file mode 100755 index 000000000..f12a4e217 --- /dev/null +++ b/tools/perf/tests/shell/record+probe_libc_inet_pton.sh @@ -0,0 +1,96 @@ +#!/bin/sh +# 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. + +# SPDX-License-Identifier: GPL-2.0 +# Arnaldo Carvalho de Melo <acme@kernel.org>, 2017 + +. $(dirname $0)/lib/probe.sh + +libc=$(grep -w libc /proc/self/maps | head -1 | sed -r 's/.*[[:space:]](\/.*)/\1/g') +nm -Dg $libc 2>/dev/null | fgrep -q inet_pton || exit 254 + +event_pattern='probe_libc:inet_pton(\_[[:digit:]]+)?' + +add_libc_inet_pton_event() { + + event_name=$(perf probe -f -x $libc -a inet_pton 2>&1 | tail -n +2 | head -n -5 | \ + grep -P -o "$event_pattern(?=[[:space:]]\(on inet_pton in $libc\))") + + if [ $? -ne 0 -o -z "$event_name" ] ; then + printf "FAIL: could not add event\n" + return 1 + fi +} + +trace_libc_inet_pton_backtrace() { + + expected=`mktemp -u /tmp/expected.XXX` + + echo "ping[][0-9 \.:]+$event_name: \([[:xdigit:]]+\)" > $expected + echo ".*inet_pton\+0x[[:xdigit:]]+[[:space:]]\($libc|inlined\)$" >> $expected + case "$(uname -m)" in + s390x) + eventattr='call-graph=dwarf,max-stack=4' + echo "gaih_inet.*\+0x[[:xdigit:]]+[[:space:]]\($libc|inlined\)$" >> $expected + echo "(__GI_)?getaddrinfo\+0x[[:xdigit:]]+[[:space:]]\($libc|inlined\)$" >> $expected + echo "main\+0x[[:xdigit:]]+[[:space:]]\(.*/bin/ping.*\)$" >> $expected + ;; + ppc64|ppc64le) + eventattr='max-stack=4' + echo "gaih_inet.*\+0x[[:xdigit:]]+[[:space:]]\($libc\)$" >> $expected + echo "getaddrinfo\+0x[[:xdigit:]]+[[:space:]]\($libc\)$" >> $expected + echo ".*(\+0x[[:xdigit:]]+|\[unknown\])[[:space:]]\(.*/bin/ping.*\)$" >> $expected + ;; + *) + eventattr='max-stack=3' + echo "getaddrinfo\+0x[[:xdigit:]]+[[:space:]]\($libc\)$" >> $expected + echo ".*(\+0x[[:xdigit:]]+|\[unknown\])[[:space:]]\(.*/bin/ping.*\)$" >> $expected + ;; + esac + + perf_data=`mktemp -u /tmp/perf.data.XXX` + perf_script=`mktemp -u /tmp/perf.script.XXX` + perf record -e $event_name/$eventattr/ -o $perf_data ping -6 -c 1 ::1 > /dev/null 2>&1 + perf script -i $perf_data > $perf_script + + exec 3<$perf_script + exec 4<$expected + while read line <&3 && read -r pattern <&4; do + [ -z "$pattern" ] && break + echo $line + echo "$line" | egrep -q "$pattern" + if [ $? -ne 0 ] ; then + printf "FAIL: expected backtrace entry \"%s\" got \"%s\"\n" "$pattern" "$line" + return 1 + fi + done + + # If any statements are executed from this point onwards, + # the exit code of the last among these will be reflected + # in err below. If the exit code is 0, the test will pass + # even if the perf script output does not match. +} + +delete_libc_inet_pton_event() { + + if [ -n "$event_name" ] ; then + perf probe -q -d $event_name + fi +} + +# Check for IPv6 interface existence +ip a sh lo | fgrep -q inet6 || exit 2 + +skip_if_no_perf_probe && \ +add_libc_inet_pton_event && \ +trace_libc_inet_pton_backtrace +err=$? +rm -f ${perf_data} ${perf_script} ${expected} +delete_libc_inet_pton_event +exit $err |