From: Filippo Arcidiacono <redacted>

On slow systems it could be needed to increase the max value [us]time
increment beetween two getrusage calls.

Signed-off-by: Filippo Arcidiacono <redacted>
Signed-off-by: Salvatore Cro <redacted>
---
 testcases/kernel/syscalls/getrusage/getrusage04.c |   42 +++++++++++++++++---
 1 files changed, 35 insertions(+), 7 deletions(-)

diff --git a/testcases/kernel/syscalls/getrusage/getrusage04.c b/testcases/kernel/syscalls/getrusage/getrusage04.c
index 3bdd3b0..92f8361 100644
--- a/testcases/kernel/syscalls/getrusage/getrusage04.c
+++ b/testcases/kernel/syscalls/getrusage/getrusage04.c

@@ -54,11 +54,22 @@ int TST_TOTAL = 1;
 
 #define BIAS_MAX      1000
 #define RECORD_MAX    20
+#define FACTOR_MAX    10
 
 #ifndef RUSAGE_THREAD
 #define RUSAGE_THREAD 1
 #endif
 
+static int opt_factor;
+static char *factor_str;
+static long factor_nr = 1;
+
+option_t child_options[] = {
+	{ "m:", &opt_factor, &factor_str },
+	{ NULL, NULL,         NULL }
+};
+
+static void fusage(void);
 static void busyloop(long wait);
 static void setup(void);
 static void cleanup(void);

@@ -69,8 +80,9 @@ int main(int argc, char *argv[])
 	unsigned long ulast, udelta, slast, sdelta;
 	int i, lc;
 	char *msg;
+	char msg_string[BUFSIZ];
 
-	msg = parse_opts(argc, argv, NULL, NULL);
+	msg = parse_opts(argc, argv, child_options, fusage);
 	if (msg != NULL)
 		tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg);
 

@@ -80,6 +92,11 @@ int main(int argc, char *argv[])
 
 	setup();
 
+	if (opt_factor)
+		factor_nr = SAFE_STRTOL(cleanup, factor_str, 0, FACTOR_MAX);
+
+	tst_resm(TINFO, "Using %ld as multiply factor for max [us]time increment (1000+%ldus)!", factor_nr, BIAS_MAX * factor_nr);

+
 	for (lc = 0; TEST_LOOPING(lc); lc++) {
 		Tst_count = 0; i = 0;
 		ulast = 0, slast = 0;

@@ -95,14 +112,20 @@ int main(int argc, char *argv[])
 				tst_resm(TINFO, "utime:%12luus; stime:%12luus",
 					    usage.ru_utime.tv_usec,
 					    usage.ru_stime.tv_usec);
-				if (udelta > 1000+BIAS_MAX)
-					tst_brkm(TFAIL, cleanup,
-						    "utime increased > 1000us:"
+				if (udelta > 1000+(BIAS_MAX * factor_nr)) {
+					sprintf(msg_string,
+						"utime increased > %ldus:",
+						1000 + BIAS_MAX * factor_nr);
+					tst_brkm(TFAIL, cleanup, msg_string,
 						    " delta = %luus", udelta);
-				if (sdelta > 1000+BIAS_MAX)
-					tst_brkm(TFAIL, cleanup,
-						    "stime increased > 1000us:"
+				}
+				if (sdelta > 1000+(BIAS_MAX * factor_nr)) {
+					sprintf(msg_string,
+						"stime increased > %ldus:",
+						1000 + BIAS_MAX * factor_nr);
+					tst_brkm(TFAIL, cleanup, msg_string,
 						    " delta = %luus", sdelta);
+				}
 			}
 			ulast = usage.ru_utime.tv_usec;
 			slast = usage.ru_stime.tv_usec;

@@ -113,6 +136,11 @@ int main(int argc, char *argv[])
 	tst_exit();
 }
 
+static void fusage(void)
+{
+	printf("  -m n    use n as multiply factor for max [us]time increment (1000+(1000*n)us), default value is 1\n");