Commit ece7f7c0 authored by Tiezhu Yang's avatar Tiezhu Yang Committed by Arnaldo Carvalho de Melo
Browse files

perf bench syscall: Add fork syscall benchmark 



This is a follow up patch for the execve bench which is actually
fork + execve, it makes sense to add the fork syscall benchmark
to compare the execve part precisely.

Some archs have no __NR_fork definition which is used only as a
check condition to call test_fork(), let us just define it as -1
to avoid build error.

Suggested-by: default avatarNamhyung Kim <namhyung@kernel.org>
Signed-off-by: default avatarTiezhu Yang <yangtiezhu@loongson.cn>
Acked-by: default avatarNamhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ian Rogers <irogers@google.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>
Cc: loongson-kernel@lists.loongnix.cn
Link: https://lore.kernel.org/r/1679381821-22736-1-git-send-email-yangtiezhu@loongson.cn


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 51ea4cb9

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

+2 −2
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0 */

#ifndef __NR_execve

#define __NR_execve 11

#ifndef __NR_fork

#define __NR_fork 2

#endif

#ifndef __NR_getppid

#define __NR_getppid 64

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

+3 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0 */

#ifndef __NR_fork

#define __NR_fork 57

#endif

#ifndef __NR_execve

#define __NR_execve 59

#endif

tools/perf/bench/bench.h

+1 −0
Original line number Diff line number Diff line
@@ -23,6 +23,7 @@ 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_syscall_fork(int argc, const char **argv);

int bench_syscall_execve(int argc, const char **argv);

int bench_mem_memcpy(int argc, const char **argv);

int bench_mem_memset(int argc, const char **argv);

tools/perf/bench/syscall.c

+35 −0
Original line number Diff line number Diff line
@@ -18,6 +18,10 @@ 
#include <unistd.h>

#include <stdlib.h>



#ifndef __NR_fork

#define __NR_fork -1

#endif



#define LOOPS_DEFAULT 10000000

static	int loops = LOOPS_DEFAULT;
@@ -31,6 +35,23 @@ static const char * const bench_syscall_usage[] = { 
	NULL

};



static void test_fork(void)

{

	pid_t pid = fork();



	if (pid < 0) {

		fprintf(stderr, "fork failed\n");

		exit(1);

	} else if (pid == 0) {

		exit(0);

	} else {

		if (waitpid(pid, NULL, 0) < 0) {

			fprintf(stderr, "waitpid failed\n");

			exit(1);

		}

	}

}



static void test_execve(void)

{

	const char *pathname = "/bin/true";
@@ -71,6 +92,12 @@ static int bench_syscall_common(int argc, const char **argv, int syscall) 
		case __NR_getpgid:

			getpgid(0);

			break;

		case __NR_fork:

			test_fork();

			/* Only loop 10000 times to save time */

			if (i == 10000)

				loops = 10000;

			break;

		case __NR_execve:

			test_execve();

			/* Only loop 10000 times to save time */
@@ -92,6 +119,9 @@ static int bench_syscall_common(int argc, const char **argv, int syscall) 
	case __NR_getpgid:

		name = "getpgid()";

		break;

	case __NR_fork:

		name = "fork()";

		break;

	case __NR_execve:

		name = "execve()";

		break;
@@ -143,6 +173,11 @@ int bench_syscall_getpgid(int argc, const char **argv) 
	return bench_syscall_common(argc, argv, __NR_getpgid);

}



int bench_syscall_fork(int argc, const char **argv)

{

	return bench_syscall_common(argc, argv, __NR_fork);

}



int bench_syscall_execve(int argc, const char **argv)

{

	return bench_syscall_common(argc, argv, __NR_execve);

tools/perf/builtin-bench.c

+1 −0
Original line number Diff line number Diff line
@@ -53,6 +53,7 @@ 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	},

	{ "fork",	"Benchmark for fork(2) calls",			bench_syscall_fork	},

	{ "execve",	"Benchmark for execve(2) calls",		bench_syscall_execve	},

	{ "all",	"Run all syscall benchmarks",			NULL			},

	{ NULL,		NULL,						NULL			},