perf bench syscall: Add getpgid syscall benchmark

This commit adds a simple getpgid syscall benchmark, more syscall
benchmarks can be added in the future.
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/1668052208-14047-4-git-send-email-yangtiezhu@loongson.cnSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/arch/x86/include/uapi/asm/unistd_32.h

@@ -2,6 +2,9 @@
 #ifndef __NR_getppid
 #define __NR_getppid 64
 #endif
+#ifndef __NR_getpgid
+#define __NR_getpgid 132
+#endif
 #ifndef __NR_gettid
 #define __NR_gettid 224
 #endif

tools/arch/x86/include/uapi/asm/unistd_64.h

@@ -2,6 +2,9 @@
 #ifndef __NR_getppid
 #define __NR_getppid 110
 #endif
+#ifndef __NR_getpgid
+#define __NR_getpgid 121
+#endif
 #ifndef __NR_gettid
 #define __NR_gettid 186
 #endif

tools/perf/bench/bench.h

@@ -22,6 +22,7 @@ int bench_numa(int argc, const char **argv);
 int bench_sched_messaging(int argc, const char **argv);
 int bench_sched_pipe(int argc, const char **argv);
 int bench_syscall_basic(int argc, const char **argv);
+int bench_syscall_getpgid(int argc, const char **argv);
 int bench_mem_memcpy(int argc, const char **argv);
 int bench_mem_memset(int argc, const char **argv);
 int bench_mem_find_bit(int argc, const char **argv);

tools/perf/bench/syscall.c

@@ -46,6 +46,9 @@ static int bench_syscall_common(int argc, const char **argv, int syscall)
 		case __NR_getppid:
 			getppid();
 			break;
+		case __NR_getpgid:
+			getpgid(0);
+			break;
 		default:
 			break;
 		}
@@ -58,6 +61,9 @@ static int bench_syscall_common(int argc, const char **argv, int syscall)
 	case __NR_getppid:
 		name = "getppid()";
 		break;
+	case __NR_getpgid:
+		name = "getpgid()";
+		break;
 	default:
 		break;
 	}
@@ -100,3 +106,8 @@ int bench_syscall_basic(int argc, const char **argv)
 {
 	return bench_syscall_common(argc, argv, __NR_getppid);
 }
+
+int bench_syscall_getpgid(int argc, const char **argv)
+{
+	return bench_syscall_common(argc, argv, __NR_getpgid);
+}

tools/perf/builtin-bench.c

@@ -52,6 +52,7 @@ static struct bench sched_benchmarks[] = {
 
 static struct bench syscall_benchmarks[] = {
 	{ "basic",	"Benchmark for basic getppid(2) calls",		bench_syscall_basic	},
+	{ "getpgid",	"Benchmark for getpgid(2) calls",		bench_syscall_getpgid	},
 	{ "all",	"Run all syscall benchmarks",			NULL			},
 	{ NULL,		NULL,						NULL			},
 };