selftests/bpf: Add 5-byte NOP uprobe trigger benchmark

JIRA: https://issues.redhat.com/browse/RHEL-78203

commit fe8e5a3
Author: Jiri Olsa <jolsa@kernel.org>
Date:   Mon Apr 14 10:36:47 2025 +0200

    selftests/bpf: Add 5-byte NOP uprobe trigger benchmark
    
    Add a 5-byte NOP uprobe trigger benchmark (x86_64 specific) to measure
    uprobes/uretprobes on top of NOP5 instructions.
    
    Signed-off-by: Jiri Olsa <jolsa@kernel.org>
    Signed-off-by: Ingo Molnar <mingo@kernel.org>
    Acked-by: Andrii Nakryiko <andrii@kernel.org>
    Cc: Oleg Nesterov <oleg@redhat.com>
    Cc: Song Liu <songliubraving@fb.com>
    Cc: Yonghong Song <yhs@fb.com>
    Cc: John Fastabend <john.fastabend@gmail.com>
    Cc: Hao Luo <haoluo@google.com>
    Cc: Steven Rostedt <rostedt@goodmis.org>
    Cc: Masami Hiramatsu <mhiramat@kernel.org>
    Cc: Alan Maguire <alan.maguire@oracle.com>
    Link: https://lore.kernel.org/r/20250414083647.1234007-2-jolsa@kernel.org

Signed-off-by: Viktor Malik <vmalik@redhat.com>

Author: viktormalik

tools/testing/selftests/bpf/bench.c

@@ -526,6 +526,12 @@ extern const struct bench bench_trig_uprobe_multi_push;
 extern const struct bench bench_trig_uretprobe_multi_push;
 extern const struct bench bench_trig_uprobe_multi_ret;
 extern const struct bench bench_trig_uretprobe_multi_ret;
+#ifdef __x86_64__
+extern const struct bench bench_trig_uprobe_nop5;
+extern const struct bench bench_trig_uretprobe_nop5;
+extern const struct bench bench_trig_uprobe_multi_nop5;
+extern const struct bench bench_trig_uretprobe_multi_nop5;
+#endif
 
 extern const struct bench bench_rb_libbpf;
 extern const struct bench bench_rb_custom;
@@ -586,6 +592,12 @@ static const struct bench *benchs[] = {
 	&bench_trig_uretprobe_multi_push,
 	&bench_trig_uprobe_multi_ret,
 	&bench_trig_uretprobe_multi_ret,
+#ifdef __x86_64__
+	&bench_trig_uprobe_nop5,
+	&bench_trig_uretprobe_nop5,
+	&bench_trig_uprobe_multi_nop5,
+	&bench_trig_uretprobe_multi_nop5,
+#endif
 	/* ringbuf/perfbuf benchmarks */
 	&bench_rb_libbpf,
 	&bench_rb_custom,

tools/testing/selftests/bpf/benchs/bench_trigger.c

@@ -333,6 +333,20 @@ static void *uprobe_producer_ret(void *input)
 	return NULL;
 }
 
+#ifdef __x86_64__
+__nocf_check __weak void uprobe_target_nop5(void)
+{
+	asm volatile (".byte 0x0f, 0x1f, 0x44, 0x00, 0x00");
+}
+
+static void *uprobe_producer_nop5(void *input)
+{
+	while (true)
+		uprobe_target_nop5();
+	return NULL;
+}
+#endif
+
 static void usetup(bool use_retprobe, bool use_multi, void *target_addr)
 {
 	size_t uprobe_offset;
@@ -448,6 +462,28 @@ static void uretprobe_multi_ret_setup(void)
 	usetup(true, true /* use_multi */, &uprobe_target_ret);
 }
 
+#ifdef __x86_64__
+static void uprobe_nop5_setup(void)
+{
+	usetup(false, false /* !use_multi */, &uprobe_target_nop5);
+}
+
+static void uretprobe_nop5_setup(void)
+{
+	usetup(true, false /* !use_multi */, &uprobe_target_nop5);
+}
+
+static void uprobe_multi_nop5_setup(void)
+{
+	usetup(false, true /* use_multi */, &uprobe_target_nop5);
+}
+
+static void uretprobe_multi_nop5_setup(void)
+{
+	usetup(true, true /* use_multi */, &uprobe_target_nop5);
+}
+#endif
+
 const struct bench bench_trig_syscall_count = {
 	.name = "trig-syscall-count",
 	.validate = trigger_validate,
@@ -506,3 +542,9 @@ BENCH_TRIG_USERMODE(uprobe_multi_ret, ret, "uprobe-multi-ret");
 BENCH_TRIG_USERMODE(uretprobe_multi_nop, nop, "uretprobe-multi-nop");
 BENCH_TRIG_USERMODE(uretprobe_multi_push, push, "uretprobe-multi-push");
 BENCH_TRIG_USERMODE(uretprobe_multi_ret, ret, "uretprobe-multi-ret");
+#ifdef __x86_64__
+BENCH_TRIG_USERMODE(uprobe_nop5, nop5, "uprobe-nop5");
+BENCH_TRIG_USERMODE(uretprobe_nop5, nop5, "uretprobe-nop5");
+BENCH_TRIG_USERMODE(uprobe_multi_nop5, nop5, "uprobe-multi-nop5");
+BENCH_TRIG_USERMODE(uretprobe_multi_nop5, nop5, "uretprobe-multi-nop5");
+#endif

tools/testing/selftests/bpf/benchs/run_bench_uprobes.sh

@@ -2,7 +2,7 @@
 
 set -eufo pipefail
 
-for i in usermode-count syscall-count {uprobe,uretprobe}-{nop,push,ret}
+for i in usermode-count syscall-count {uprobe,uretprobe}-{nop,push,ret,nop5}
 do
 	summary=$(sudo ./bench -w2 -d5 -a trig-$i | tail -n1 | cut -d'(' -f1 | cut -d' ' -f3-)
 	printf "%-15s: %s\n" $i "$summary"