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perf test arm64: Test unwinding using fame-pointer (fp) mode 

Add a shell script to check that the call-graphs generated using frame
pointers (--call-graph fp) are complete and not missing leaf functions:

  | $ perf test 88 -v
  |  88: Check Arm64 callgraphs are complete in fp mode                  :
  | --- start ---
  | test child forked, pid 8734
  |  + Compiling test program (/tmp/test_program.Cz3yL)...
  |  + Recording (PID=8749)...
  |  + Stopping perf-record...
  | test_program.Cz
  |                  728 leaf
  |                  753 parent
  |                  76c main
  | test child finished with 0
  | ---- end ----
  | Check Arm SPE callgraphs are complete in fp mode: Ok

It's supposed to work with both unwinders:

  | $ make                # for libunwind (default)
  | $ make NO_LIBUNWIND=1 # for libdw

Tester notes:

Ran it on N1SDP and it passes, and it fails if b9f6fbb3b2 ("perf
arm64: Inject missing frames when using 'perf record --call-graph=fp'")
isn't applied.

Fixes: b9f6fbb3b2 ("perf arm64: Inject missing frames when using 'perf record --call-graph=fp'")
Suggested-by: Jiri Olsa <jolsa@kernel.org>
Reviewed-by: James Clark <james.clark@arm.com>
Tested-by: James Clark <james.clark@arm.com>
Signed-off-by: German Gomez <german.gomez@arm.com>
Cc: Alexandre Truong <alexandre.truong@arm.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20220316172015.98000-1-german.gomez@arm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
German Gomez 2022-03-16 17:20:15 +00:00 committed by Arnaldo Carvalho de Melo
parent 5edc3c618b
commit cd6382d827
1 changed files with 68 additions and 0 deletions
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68
tools/perf/tests/shell/test_arm_callgraph_fp.sh Executable file
View File

@ -0,0 +1,68 @@
#!/bin/sh
# Check Arm64 callgraphs are complete in fp mode
# SPDX-License-Identifier: GPL-2.0
lscpu | grep -q "aarch64" || exit 2
if ! [ -x "$(command -v cc)" ]; then
echo "failed: no compiler, install gcc"
exit 2
fi
PERF_DATA=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
TEST_PROGRAM_SOURCE=$(mktemp /tmp/test_program.XXXXX.c)
TEST_PROGRAM=$(mktemp /tmp/test_program.XXXXX)
cleanup_files()
{
rm -f $PERF_DATA
rm -f $TEST_PROGRAM_SOURCE
rm -f $TEST_PROGRAM
}
trap cleanup_files exit term int
cat << EOF > $TEST_PROGRAM_SOURCE
int a = 0;
void leaf(void) {
for (;;)
a += a;
}
void parent(void) {
leaf();
}
int main(void) {
parent();
return 0;
}
EOF
echo " + Compiling test program ($TEST_PROGRAM)..."
CFLAGS="-g -O0 -fno-inline -fno-omit-frame-pointer"
cc $CFLAGS $TEST_PROGRAM_SOURCE -o $TEST_PROGRAM || exit 1
# Add a 1 second delay to skip samples that are not in the leaf() function
perf record -o $PERF_DATA --call-graph fp -e cycles//u -D 1000 -- $TEST_PROGRAM 2> /dev/null &
PID=$!
echo " + Recording (PID=$PID)..."
sleep 2
echo " + Stopping perf-record..."
kill $PID
wait $PID
# expected perf-script output:
#
# program
# 728 leaf
# 753 parent
# 76c main
# ...
perf script -i $PERF_DATA -F comm,ip,sym | head -n4
perf script -i $PERF_DATA -F comm,ip,sym | head -n4 | \
awk '{ if ($2 != "") sym[i++] = $2 } END { if (sym[0] != "leaf" ||
sym[1] != "parent" ||
sym[2] != "main") exit 1 }'