linux-kernel - [PATCH v2 1/3] perf bench syscall: Introduce bench_syscall

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Date:   Thu, 29 Sep 2022 16:52:49 +0800
From:   Tiezhu Yang <yangtiezhu@...ngson.cn>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>
Cc:     linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/3] perf bench syscall: Introduce bench_syscall_common()

In the current code, there is only a basic syscall benchmark via getppid,
this is not enough. Introduce bench_syscall_common() so that we can add
more syscalls to benchmark. This is preparation for later patch.

Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
---
 tools/perf/bench/syscall.c | 30 ++++++++++++++++++++++++++----
 1 file changed, 26 insertions(+), 4 deletions(-)

diff --git a/tools/perf/bench/syscall.c b/tools/perf/bench/syscall.c
index 9b75101..51840e9 100644
--- a/tools/perf/bench/syscall.c
+++ b/tools/perf/bench/syscall.c
@@ -16,6 +16,7 @@
 #include <sys/types.h>
 #include <unistd.h>
 #include <stdlib.h>
+#include <asm/unistd.h>
 
 #define LOOPS_DEFAULT 10000000
 static	int loops = LOOPS_DEFAULT;
@@ -30,25 +31,41 @@ static const char * const bench_syscall_usage[] = {
 	NULL
 };
 
-int bench_syscall_basic(int argc, const char **argv)
+static int bench_syscall_common(int argc, const char **argv, int syscall)
 {
 	struct timeval start, stop, diff;
 	unsigned long long result_usec = 0;
+	const char *name = NULL;
 	int i;
 
 	argc = parse_options(argc, argv, options, bench_syscall_usage, 0);
 
 	gettimeofday(&start, NULL);
 
-	for (i = 0; i < loops; i++)
-		getppid();
+	for (i = 0; i < loops; i++) {
+		switch (syscall) {
+		case __NR_getppid:
+			getppid();
+			break;
+		default:
+			break;
+		}
+	}
 
 	gettimeofday(&stop, NULL);
 	timersub(&stop, &start, &diff);
 
+	switch (syscall) {
+	case __NR_getppid:
+		name = "getppid()";
+		break;
+	default:
+		break;
+	}
+
 	switch (bench_format) {
 	case BENCH_FORMAT_DEFAULT:
-		printf("# Executed %'d getppid() calls\n", loops);
+		printf("# Executed %'d %s calls\n", loops, name);
 
 		result_usec = diff.tv_sec * 1000000;
 		result_usec += diff.tv_usec;
@@ -79,3 +96,8 @@ int bench_syscall_basic(int argc, const char **argv)
 
 	return 0;
 }
+
+int bench_syscall_basic(int argc, const char **argv)
+{
+	return bench_syscall_common(argc, argv, __NR_getppid);
+}
-- 
2.1.0