[LTP] [PATCH v1] Check for maximum available pids in dio_sparse.c

[Andrea Cervesato]

Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>
---
 testcases/kernel/io/ltp-aiodio/dio_sparse.c | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/testcases/kernel/io/ltp-aiodio/dio_sparse.c b/testcases/kernel/io/ltp-aiodio/dio_sparse.c
index 929adbfba..5236539ff 100644
--- a/testcases/kernel/io/ltp-aiodio/dio_sparse.c
+++ b/testcases/kernel/io/ltp-aiodio/dio_sparse.c
@@ -59,6 +59,7 @@ static void dio_sparse(int fd, int align, long long fs, int ws, long long off)
 static void setup(void)
 {
 	struct stat sb;
+	int max_pids;
 
 	numchildren = 1000;
 	writesize = 1024;
@@ -69,6 +70,13 @@ static void setup(void)
 	if (tst_parse_int(str_numchildren, &numchildren, 1, INT_MAX))
 		tst_brk(TBROK, "Invalid number of children '%s'", str_numchildren);
 
+	max_pids = tst_get_free_pids();
+	if (numchildren > max_pids) {
+		numchildren = max_pids;
+
+		tst_res(TCONF, "Number of children reduced to %d due to system limitations", numchildren);
+	}
+
 	if (tst_parse_filesize(str_writesize, &writesize, 1, LLONG_MAX))
 		tst_brk(TBROK, "Invalid write blocks size '%s'", str_writesize);
 
@@ -129,10 +137,10 @@ static struct tst_test test = {
 	.needs_tmpdir = 1,
 	.forks_child = 1,
 	.options = (struct tst_option[]) {
-		{"n:", &str_numchildren, "Number of threads (default 1000)"},
-		{"w:", &str_writesize, "Size of writing blocks (default 1K)"},
-		{"s:", &str_filesize, "Size of file (default 100M)"},
-		{"o:", &str_offset, "File offset (default 0)"},
-		{}
+		{"n:", &str_numchildren, "-n\t Number of threads (default 1000)"},
+		{"w:", &str_writesize, "-w\t Size of writing blocks (default 1K)"},
+		{"s:", &str_filesize, "-s\t Size of file (default 100M)"},
+		{"o:", &str_offset, "-o\t File offset (default 0)"},
+		{},
 	},
 };
-- 
2.34.1