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tests: sched: Add busy threads for SMP

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The sched benchmark is designed for systems with a single
CPU. Otherwise, the timestamps would be wrong when the partner
thread is scheduled on another CPU, i.e. negative values:

```
unpend   63 ready   62 switch -16562 pend 18937 tot 2500 (avg  928)
```

When the system allows for multiple CPUs, spawn a non-preemptible
thread to keep the other CPUs busy.

Signed-off-by: Yong Cong Sin <ycsin@meta.com>
This commit is contained in:
Yong Cong Sin 2024-11-07 15:08:31 +08:00 • committed by Anas Nashif
commit 927420a423
1 changed files with 27 additions and 0 deletions
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27
tests/benchmarks/sched/src/main.c
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@ -36,6 +36,15 @@
static K_THREAD_STACK_DEFINE(partner_stack, 1024);
static struct k_thread partner_thread;
#if (CONFIG_MP_MAX_NUM_CPUS > 1)
static struct k_thread busy_thread[CONFIG_MP_MAX_NUM_CPUS - 1];
#define BUSY_THREAD_STACK_SIZE (1024 + CONFIG_TEST_EXTRA_STACK_SIZE)
static K_THREAD_STACK_ARRAY_DEFINE(busy_thread_stack, CONFIG_MP_MAX_NUM_CPUS - 1,
BUSY_THREAD_STACK_SIZE);
#endif /* (CONFIG_MP_MAX_NUM_CPUS > 1) */
_wait_q_t waitq;
enum {
@ -88,8 +97,26 @@ static void partner_fn(void *arg1, void *arg2, void *arg3)
}
}
#if (CONFIG_MP_MAX_NUM_CPUS > 1)
static void busy_thread_entry(void *arg1, void *arg2, void *arg3)
{
while (true) {
}
}
#endif /* (CONFIG_MP_MAX_NUM_CPUS > 1) */
int main(void)
{
#if (CONFIG_MP_MAX_NUM_CPUS > 1)
/* Spawn busy threads that will execute on the other cores */
for (uint32_t i = 0; i < CONFIG_MP_MAX_NUM_CPUS - 1; i++) {
k_thread_create(&busy_thread[i], busy_thread_stack[i],
BUSY_THREAD_STACK_SIZE, busy_thread_entry,
NULL, NULL, NULL,
K_HIGHEST_THREAD_PRIO, 0, K_NO_WAIT);
}
#endif /* (CONFIG_MP_MAX_NUM_CPUS > 1) */
z_waitq_init(&waitq);
int main_prio = k_thread_priority_get(k_current_get());