linux-kernel - [PATCH 14/15] task_diag: Enhance fork tool to spawn threads

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Date:	Mon, 11 Apr 2016 16:35:54 -0700
From:	Andrey Vagin <avagin@...nvz.org>
To:	linux-kernel@...r.kernel.org
Cc:	Andrey Vagin <avagin@...nvz.org>, Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	Roger Luethi <rl@...lgate.ch>, Arnd Bergmann <arnd@...db.de>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	David Ahern <dsahern@...il.com>,
	Andy Lutomirski <luto@...capital.net>,
	Pavel Odintsov <pavel.odintsov@...il.com>
Subject: [PATCH 14/15] task_diag: Enhance fork tool to spawn threads

From: David Ahern <dsahern@...il.com>

Add option to fork threads as well as processes.
Make the sleep time configurable too so that spawned
tasks exit on their own.

Signed-off-by: David Ahern <dsahern@...il.com>
Signed-off-by: Andrey Vagin <avagin@...nvz.org>
---
 tools/testing/selftests/task_diag/Makefile |  2 ++
 tools/testing/selftests/task_diag/_run.sh  |  4 ++--
 tools/testing/selftests/task_diag/fork.c   | 36 ++++++++++++++++++++++++++----
 3 files changed, 36 insertions(+), 6 deletions(-)

diff --git a/tools/testing/selftests/task_diag/Makefile b/tools/testing/selftests/task_diag/Makefile
index 69b7934..c9977231 100644
--- a/tools/testing/selftests/task_diag/Makefile
+++ b/tools/testing/selftests/task_diag/Makefile
@@ -10,6 +10,8 @@ task_diag_comm.o: task_diag_comm.c task_diag_comm.h
 
 task_diag_all: task_diag_all.o task_diag_comm.o
 fork: fork.c
+	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ -lpthread
+
 task_proc_all: task_proc_all.c
 
 clean:
diff --git a/tools/testing/selftests/task_diag/_run.sh b/tools/testing/selftests/task_diag/_run.sh
index 3f541fe..559f02a 100755
--- a/tools/testing/selftests/task_diag/_run.sh
+++ b/tools/testing/selftests/task_diag/_run.sh
@@ -2,7 +2,7 @@
 set -o pipefail
 set -e -x
 
-./fork 1000
+./fork 1000 10
 
 nprocesses=`./task_diag_all all --maps | grep 'pid.*tgid.*ppid.*comm fork$' | wc -l`
 nthreads=`./task_diag_all All --smaps --cred | grep 'pid.*tgid.*ppid.*comm fork$' | wc -l`
@@ -12,7 +12,7 @@ nchildren=`./task_diag_all children --pid 1 | grep 'pid.*tgid.*ppid.*comm fork$'
 
 killall -9 fork
 
-[ "$nthreads"     -eq 1000 ] &&
+[ "$nthreads"     -eq 10000 ] &&
 [ "$nprocesses"   -eq 1000  ] &&
 [ "$nchildren"    -eq 1000  ] &&
 true ||  {
diff --git a/tools/testing/selftests/task_diag/fork.c b/tools/testing/selftests/task_diag/fork.c
index c6e17d1..ebddedd2 100644
--- a/tools/testing/selftests/task_diag/fork.c
+++ b/tools/testing/selftests/task_diag/fork.c
@@ -2,15 +2,39 @@
 #include <string.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <pthread.h>
 
+void *f(void *arg)
+{
+	unsigned long t = (unsigned long) arg;
+
+	sleep(t);
+	return NULL;
+}
+
+/* usage: fork nproc [mthreads [sleep]] */
 int main(int argc, char **argv)
 {
-	int i, n;
+	int i, j, n, m = 0;
+	unsigned long t_sleep = 1000;
+	pthread_attr_t attr;
+	pthread_t id;
 
-	if (argc < 2)
+	if (argc < 2) {
+		fprintf(stderr, "usage: fork nproc [mthreads [sleep]]\n");
 		return 1;
+	}
 
 	n = atoi(argv[1]);
+
+	if (argc > 2)
+		m = atoi(argv[2]);
+
+	if (argc > 3)
+		t_sleep = atoi(argv[3]);
+
+	pthread_attr_init(&attr);
+
 	for (i = 0; i < n; i++) {
 		pid_t pid;
 
@@ -20,8 +44,12 @@ int main(int argc, char **argv)
 			return 1;
 		}
 		if (pid == 0) {
-			while (1)
-				sleep(1000);
+			if (m) {
+				for (j = 0; j < m-1; ++j)
+					pthread_create(&id, &attr, f, (void *)t_sleep);
+			}
+
+			sleep(t_sleep);
 			return 0;
 		}
 	}
-- 
2.5.5