linux-kernel - [PATCH v2 5/6] perf test workload: Add inlineloop test workload

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Message-ID: <20260110082647.1487574-6-irogers@google.com>
Date: Sat, 10 Jan 2026 00:26:46 -0800
From: Ian Rogers <irogers@...gle.com>
To: Tony Jones <tonyj@...e.de>, Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	James Clark <james.clark@...aro.org>, Howard Chu <howardchu95@...il.com>, 
	Stephen Brennan <stephen.s.brennan@...cle.com>, linux-kernel@...r.kernel.org, 
	linux-perf-users@...r.kernel.org
Subject: [PATCH v2 5/6] perf test workload: Add inlineloop test workload

The purpose of this workload is to gather samples in an inlined
function. This can be used to test whether inlined addr2line works
correctly.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/tests/builtin-test.c         |  1 +
 tools/perf/tests/tests.h                |  1 +
 tools/perf/tests/workloads/Build        |  2 +
 tools/perf/tests/workloads/inlineloop.c | 52 +++++++++++++++++++++++++
 4 files changed, 56 insertions(+)
 create mode 100644 tools/perf/tests/workloads/inlineloop.c

diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
index bd6ffa8e4578..e2490652f030 100644
--- a/tools/perf/tests/builtin-test.c
+++ b/tools/perf/tests/builtin-test.c
@@ -153,6 +153,7 @@ static struct test_workload *workloads[] = {
 	&workload__datasym,
 	&workload__landlock,
 	&workload__traploop,
+	&workload__inlineloop,
 };
 
 #define workloads__for_each(workload) \
diff --git a/tools/perf/tests/tests.h b/tools/perf/tests/tests.h
index cb67ddbd0375..1f0f8b267fb1 100644
--- a/tools/perf/tests/tests.h
+++ b/tools/perf/tests/tests.h
@@ -240,6 +240,7 @@ DECLARE_WORKLOAD(brstack);
 DECLARE_WORKLOAD(datasym);
 DECLARE_WORKLOAD(landlock);
 DECLARE_WORKLOAD(traploop);
+DECLARE_WORKLOAD(inlineloop);
 
 extern const char *dso_to_test;
 extern const char *test_objdump_path;
diff --git a/tools/perf/tests/workloads/Build b/tools/perf/tests/workloads/Build
index fb1012cc4fc3..866a00bd14a0 100644
--- a/tools/perf/tests/workloads/Build
+++ b/tools/perf/tests/workloads/Build
@@ -8,9 +8,11 @@ perf-test-y += brstack.o
 perf-test-y += datasym.o
 perf-test-y += landlock.o
 perf-test-y += traploop.o
+perf-test-y += inlineloop.o
 
 CFLAGS_sqrtloop.o         = -g -O0 -fno-inline -U_FORTIFY_SOURCE
 CFLAGS_leafloop.o         = -g -O0 -fno-inline -fno-omit-frame-pointer -U_FORTIFY_SOURCE
 CFLAGS_brstack.o          = -g -O0 -fno-inline -U_FORTIFY_SOURCE
 CFLAGS_datasym.o          = -g -O0 -fno-inline -U_FORTIFY_SOURCE
 CFLAGS_traploop.o         = -g -O0 -fno-inline -U_FORTIFY_SOURCE
+CFLAGS_inlineloop.o       = -g -O2
diff --git a/tools/perf/tests/workloads/inlineloop.c b/tools/perf/tests/workloads/inlineloop.c
new file mode 100644
index 000000000000..bc82dfc7c410
--- /dev/null
+++ b/tools/perf/tests/workloads/inlineloop.c
@@ -0,0 +1,52 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <pthread.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <unistd.h>
+#include <linux/compiler.h>
+#include "../tests.h"
+
+static volatile int a;
+static volatile sig_atomic_t done;
+
+static void sighandler(int sig __maybe_unused)
+{
+	done = 1;
+}
+
+static inline void __attribute__((always_inline)) leaf(int b)
+{
+again:
+	a += b;
+	if (!done)
+		goto again;
+}
+
+static inline void __attribute__((always_inline)) middle(int b)
+{
+	leaf(b);
+}
+
+static noinline void parent(int b)
+{
+	middle(b);
+}
+
+static int inlineloop(int argc, const char **argv)
+{
+	int sec = 1;
+
+	pthread_setname_np(pthread_self(), "perf-inlineloop");
+	if (argc > 0)
+		sec = atoi(argv[0]);
+
+	signal(SIGINT, sighandler);
+	signal(SIGALRM, sighandler);
+	alarm(sec);
+
+	parent(sec);
+
+	return 0;
+}
+
+DEFINE_WORKLOAD(inlineloop);
-- 
2.52.0.457.g6b5491de43-goog