[PATCH v2 2/2] perf test: Add DWARF callchain conversion test

Namhyung Kim
2026-01-10T01:17:17Z

$ ./perf test -vv "DWARF callchain"
87: perf inject to convert DWARF callchains to regular ones:
--- start ---
test child forked, pid 1560328
recording data with DWARF callchain
[ perf record: Woken up 4 times to write data ]
[ perf record: Captured and wrote 0.908 MB /tmp/perf-test.nM3WoW (105 samples) ]
convert DWARF callchain using perf inject
compare the both result excluding inlined functions
---- end(0) ----
87: perf inject to convert DWARF callchains to regular ones : Ok

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
tools/perf/tests/shell/inject-callchain.sh | 45 ++++++++++++++++++++++
1 file changed, 45 insertions(+)
create mode 100755 tools/perf/tests/shell/inject-callchain.sh

diff --git a/tools/perf/tests/shell/inject-callchain.sh b/tools/perf/tests/shell/inject-callchain.sh
new file mode 100755
index 0000000000000000..a1cba8010f954d21
--- /dev/null
+++ b/tools/perf/tests/shell/inject-callchain.sh
@@ -0,0 +1,45 @@
+#!/bin/bash
+# perf inject to convert DWARF callchains to regular ones
+# SPDX-License-Identifier: GPL-2.0
+
+if ! perf check feature -q dwarf; then
+ echo "SKIP: DWARF support is not available"
+ exit 2
+fi
+
+TESTDATA=$(mktemp /tmp/perf-test.XXXXXX)
+
+err=0
+
+cleanup()
+{
+ trap - EXIT TERM INT
+ rm -f ${TESTDATA}*
+}
+
+trap_cleanup()
+{
+ cleanup
+ exit 1
+}
+
+trap trap_cleanup EXIT TERM INT
+
+echo "recording data with DWARF callchain"
+perf record -F 999 --call-graph dwarf -o "${TESTDATA}" -- perf test -w noploop
+
+echo "convert DWARF callchain using perf inject"
+perf inject -i "${TESTDATA}" --convert-callchain -o "${TESTDATA}.new"
+
+perf report -i "${TESTDATA}" --no-children -q --percent-limit=1 > ${TESTDATA}.out
+perf report -i "${TESTDATA}.new" --no-children -q --percent-limit=1 > ${TESTDATA}.new.out
+
+echo "compare the both result excluding inlined functions"
+if diff -u "${TESTDATA}.out" "${TESTDATA}.new.out" | grep "^- " | grep -qv "(inlined)"; then
+ echo "Found some differences"
+ diff -u "${TESTDATA}.out" "${TESTDATA}.new.out"
+ err=1
+fi
+
+cleanup
+exit $err
--
2.52.0.457.g6b5491de43-goog