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ched/starvation: handle explicit runtime and voluntary preempt #1327

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ched/starvation: handle explicit runtime and voluntary preempt #1327

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6d3658a
sched/starvation: honor explicit runtime option
Jun 17, 2026
e823c5a
sched/starvation: skip voluntary preemption kernels
Jun 17, 2026
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21 changes: 18 additions & 3 deletions testcases/kernel/sched/cfs-scheduler/starvation.c
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,7 @@
#include <sys/wait.h>
#include <stdlib.h>
#include <sched.h>
#include <string.h>

#include "tst_test.h"
#include "tst_kconfig.h"
Expand All @@ -30,6 +31,15 @@ static int timeout;

#define CALLIBRATE_LOOPS 120000000

static int has_preempt_voluntary(void)
{
struct tst_kconfig_var kconfig = TST_KCONFIG_INIT("CONFIG_PREEMPT_VOLUNTARY");

tst_kconfig_read(&kconfig, 1);

return kconfig.choice == 'y';
}

static int callibrate(void)
{
int i;
Expand Down Expand Up @@ -81,6 +91,9 @@ static void setup(void)
if (tst_check_preempt_rt())
tst_brk(TCONF, "This test is not designed for the RT kernel");

if (has_preempt_voluntary())
tst_brk(TCONF, "This test is not reliable on voluntary preemption kernels");

CPU_ZERO(&mask);

/* Restrict test to a single cpu */
Expand All @@ -105,10 +118,12 @@ static void setup(void)
if (tst_parse_long(str_loop, &loop, 1, LONG_MAX))
tst_brk(TBROK, "Invalid number of loop number '%s'", str_loop);

if (tst_parse_int(str_timeout, &timeout, 1, INT_MAX))
tst_brk(TBROK, "Invalid number of timeout '%s'", str_timeout);
else
if (str_timeout) {
if (tst_parse_int(str_timeout, &timeout, 1, INT_MAX))
tst_brk(TBROK, "Invalid number of timeout '%s'", str_timeout);
} else {
timeout = callibrate() / 1000;
}

if (tst_has_slow_kconfig())
tst_brk(TCONF, "Skip test due to slow kernel configuration");
Expand Down