[LTP] [PATCH v2] sched/starvation: Choose from available cpus

Edward Liaw via ltp
2024-06-06T01:40:52Z

From: Edward Liaw via ltp <ltp@lists.linux.it>

Use the first available cpu in the sched_getaffinity set.

This test was failing as a 32bit test for some arm architectures where
cpu 0 does not support 32bit applications.

Reviewed-by: Petr Vorel <pvorel@suse.cz>
Signed-off-by: Edward Liaw <edliaw@google.com>
---
.../kernel/sched/cfs-scheduler/starvation.c | 19 +++++++++++++++++--
1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/testcases/kernel/sched/cfs-scheduler/starvation.c b/testcases/kernel/sched/cfs-scheduler/starvation.c
index eb9fd6ff5..0fd45e281 100644
--- a/testcases/kernel/sched/cfs-scheduler/starvation.c
+++ b/testcases/kernel/sched/cfs-scheduler/starvation.c
@@ -49,12 +49,27 @@ again:
static void setup(void)
{
cpu_set_t mask;
+ int cpu = 0;
+ long ncpus = tst_ncpus_conf();

CPU_ZERO(&mask);

- CPU_SET(0, &mask);
+ /* Restrict test to a single cpu */
+ TST_EXP_PASS(sched_getaffinity(0, sizeof(mask), &mask));

- TST_EXP_POSITIVE(sched_setaffinity(0, sizeof(mask), &mask));
+ if (CPU_COUNT(&mask) == 0)
+ tst_brk(TBROK, "No cpus available");
+
+ while (CPU_ISSET(cpu, &mask) == 0 && cpu < ncpus)
+ cpu++;
+
+ CPU_ZERO(&mask);
+
+ CPU_SET(cpu, &mask);
+
+ TST_EXP_PASS(sched_setaffinity(0, sizeof(mask), &mask));
+
+ tst_res(TINFO, "Set affinity to CPU %d", cpu);

if (tst_parse_long(str_loop, &loop, 1, LONG_MAX))
tst_brk(TBROK, "Invalid number of loop number '%s'", str_loop);
--
2.45.1.467.gbab1589fc0-goog

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