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authorTiezhu Yang <yangtiezhu@loongson.cn>2023-03-21 09:57:01 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2023-04-04 15:39:55 +0300
commitece7f7c0507cc147f72e117e22732091db758885 (patch)
treedba408a55d719e4ff50d10635cf34ca75569aa60
parent51ea4cb96f35ae2f31d45d9a0dbf30da13bbe441 (diff)
downloadlinux-ece7f7c0507cc147f72e117e22732091db758885.tar.xz
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: Namhyung Kim <namhyung@kernel.org> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn> Acked-by: Namhyung 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: Arnaldo Carvalho de Melo <acme@redhat.com>
-rw-r--r--tools/arch/x86/include/uapi/asm/unistd_32.h4
-rw-r--r--tools/arch/x86/include/uapi/asm/unistd_64.h3
-rw-r--r--tools/perf/bench/bench.h1
-rw-r--r--tools/perf/bench/syscall.c35
-rw-r--r--tools/perf/builtin-bench.c1
5 files changed, 42 insertions, 2 deletions
diff --git a/tools/arch/x86/include/uapi/asm/unistd_32.h b/tools/arch/x86/include/uapi/asm/unistd_32.h
index 2712d5e03e2e..b8ddfc4c4ab0 100644
--- a/tools/arch/x86/include/uapi/asm/unistd_32.h
+++ b/tools/arch/x86/include/uapi/asm/unistd_32.h
@@ -1,6 +1,6 @@
/* 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
diff --git a/tools/arch/x86/include/uapi/asm/unistd_64.h b/tools/arch/x86/include/uapi/asm/unistd_64.h
index a6f7fe84d4df..f70d2cada256 100644
--- a/tools/arch/x86/include/uapi/asm/unistd_64.h
+++ b/tools/arch/x86/include/uapi/asm/unistd_64.h
@@ -1,4 +1,7 @@
/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __NR_fork
+#define __NR_fork 57
+#endif
#ifndef __NR_execve
#define __NR_execve 59
#endif
diff --git a/tools/perf/bench/bench.h b/tools/perf/bench/bench.h
index e43893151a3e..edfc25793cca 100644
--- a/tools/perf/bench/bench.h
+++ b/tools/perf/bench/bench.h
@@ -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);
diff --git a/tools/perf/bench/syscall.c b/tools/perf/bench/syscall.c
index fe79f7f3091e..ea4dfc07cbd6 100644
--- a/tools/perf/bench/syscall.c
+++ b/tools/perf/bench/syscall.c
@@ -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);
diff --git a/tools/perf/builtin-bench.c b/tools/perf/builtin-bench.c
index 814e9afc86f6..d0fcc3cdc185 100644
--- a/tools/perf/builtin-bench.c
+++ b/tools/perf/builtin-bench.c
@@ -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 },