perf bench uprobe: Add uretprobe variant of uprobe benchmarks

Name benchmarks with _ret at the end to avoid creating a new set of
benchmarks.

Signed-off-by: Ian Rogers <[e-mail]>
Acked-by: Jiri Olsa <[e-mail]>
Cc: Adrian Hunter <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: Andrei Vagin <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Kan Liang <[e-mail]>
Cc: Kees Kook <[e-mail]>
Cc: Mark Rutland <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/bench/bench.h

···
 int bench_uprobe_baseline(int argc, const char **argv);
 int bench_uprobe_empty(int argc, const char **argv);
 int bench_uprobe_trace_printk(int argc, const char **argv);
+int bench_uprobe_empty_ret(int argc, const char **argv);
+int bench_uprobe_trace_printk_ret(int argc, const char **argv);
 int bench_pmu_scan(int argc, const char **argv);
 
 #define BENCH_FORMAT_DEFAULT_STR	"default"

tools/perf/bench/uprobe.c

···
 static int loops = LOOPS_DEFAULT;
 
 enum bench_uprobe {
-        BENCH_UPROBE__BASELINE,
-        BENCH_UPROBE__EMPTY,
-        BENCH_UPROBE__TRACE_PRINTK,
+	BENCH_UPROBE__BASELINE,
+	BENCH_UPROBE__EMPTY,
+	BENCH_UPROBE__TRACE_PRINTK,
+	BENCH_UPROBE__EMPTY_RET,
+	BENCH_UPROBE__TRACE_PRINTK_RET,
 };
 
 static const struct option options[] = {
···
 	case BENCH_UPROBE__BASELINE:							break;
 	case BENCH_UPROBE__EMPTY:	 bench_uprobe__attach_uprobe(empty);		break;
 	case BENCH_UPROBE__TRACE_PRINTK: bench_uprobe__attach_uprobe(trace_printk);	break;
+	case BENCH_UPROBE__EMPTY_RET:	 bench_uprobe__attach_uprobe(empty_ret);	break;
+	case BENCH_UPROBE__TRACE_PRINTK_RET: bench_uprobe__attach_uprobe(trace_printk_ret); break;
 	default:
 		fprintf(stderr, "Invalid bench: %d\n", bench);
 		goto cleanup;
···
 int bench_uprobe_trace_printk(int argc, const char **argv)
 {
 	return bench_uprobe(argc, argv, BENCH_UPROBE__TRACE_PRINTK);
+}
+
+int bench_uprobe_empty_ret(int argc, const char **argv)
+{
+	return bench_uprobe(argc, argv, BENCH_UPROBE__EMPTY_RET);
+}
+
+int bench_uprobe_trace_printk_ret(int argc, const char **argv)
+{
+	return bench_uprobe(argc, argv, BENCH_UPROBE__TRACE_PRINTK_RET);
 }

tools/perf/builtin-bench.c

···
 	{ "baseline",	"Baseline libc usleep(1000) call",				bench_uprobe_baseline,	},
 	{ "empty",	"Attach empty BPF prog to uprobe on usleep, system wide",	bench_uprobe_empty,	},
 	{ "trace_printk", "Attach trace_printk BPF prog to uprobe on usleep syswide",	bench_uprobe_trace_printk,	},
+	{ "empty_ret",	"Attach empty BPF prog to uretprobe on usleep, system wide",	bench_uprobe_empty_ret,	},
+	{ "trace_printk_ret", "Attach trace_printk BPF prog to uretprobe on usleep syswide", bench_uprobe_trace_printk_ret,},
 	{ NULL,	NULL, NULL },
 };
 

tools/perf/util/bpf_skel/bench_uprobe.bpf.c

···
 #include <bpf/bpf_tracing.h>
 
 unsigned int nr_uprobes;
+unsigned int nr_uretprobes;
 
 SEC("uprobe")
 int BPF_UPROBE(empty)
···
 	char fmt[] = "perf bench uprobe %u";
 
 	bpf_trace_printk(fmt, sizeof(fmt), ++nr_uprobes);
+	return 0;
+}
+
+SEC("uretprobe")
+int BPF_URETPROBE(empty_ret)
+{
+	return 0;
+}
+
+SEC("uretprobe")
+int BPF_URETPROBE(trace_printk_ret)
+{
+	char fmt[] = "perf bench uretprobe %u";
+
+	bpf_trace_printk(fmt, sizeof(fmt), ++nr_uretprobes);
 	return 0;
 }