Commit 8fc375d7 authored Aug 10, 2017 by Arnaldo Carvalho de Melo

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 <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-idrntt4nbg15aafu8hjmv7sk@git.kernel.org


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

parent 4a084ecf

tools/perf/tests/shell/trace+probe_libc_inet_pton.sh

0 → 100755

+40 −0

Original line number	Diff line number	Diff line
		# 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 <acme@kernel.org>, 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

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