Commit ee7bbf55 authored by Peter Mitsis's avatar Peter Mitsis Committed by Anas Nashif
Browse files

tests: latency_measure: Add busy threads for SMP 



The latency_measure benchmark is designed for systems with a single
CPU. When the system allows for multiple CPUs, instead of forcing
a single CPU to be used via 'prj.conf', spawn a non-preemptible
thread to keep the other CPUs busy.

Signed-off-by: default avatarPeter Mitsis <peter.mitsis@intel.com>
parent 57651fca

tests/benchmarks/latency_measure/prj.conf

+0 −2
Original line number Diff line number Diff line
@@ -20,8 +20,6 @@ CONFIG_COVERAGE=n 
# Disable system power management

CONFIG_PM=n



# Can only run under 1 CPU

CONFIG_MP_MAX_NUM_CPUS=1

CONFIG_TIMING_FUNCTIONS=y



CONFIG_HEAP_MEM_POOL_SIZE=2048

tests/benchmarks/latency_measure/src/main.c

+27 −0
Original line number Diff line number Diff line
@@ -31,6 +31,14 @@ K_THREAD_STACK_DEFINE(alt_stack, ALT_STACK_SIZE); 


K_SEM_DEFINE(pause_sem, 0, 1);



#if (CONFIG_MP_MAX_NUM_CPUS > 1)

struct k_thread  busy_thread[CONFIG_MP_MAX_NUM_CPUS - 1];



#define BUSY_THREAD_STACK_SIZE  (1024 + CONFIG_TEST_EXTRA_STACK_SIZE)



K_THREAD_STACK_DEFINE(busy_thread_stack, BUSY_THREAD_STACK_SIZE);

#endif



struct k_thread  start_thread;

struct k_thread  alt_thread;
@@ -60,6 +68,14 @@ extern int stack_blocking_ops(uint32_t num_iterations, uint32_t start_options, 
			       uint32_t alt_options);

extern void heap_malloc_free(void);



#if (CONFIG_MP_MAX_NUM_CPUS > 1)

static void busy_thread_entry(void *arg1, void *arg2, void *arg3)

{

	while (1) {

	}

}

#endif



static void test_thread(void *arg1, void *arg2, void *arg3)

{

	uint32_t freq;
@@ -68,6 +84,17 @@ static void test_thread(void *arg1, void *arg2, void *arg3) 
	ARG_UNUSED(arg2);

	ARG_UNUSED(arg3);



#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



#ifdef CONFIG_USERSPACE

	k_mem_domain_add_partition(&k_mem_domain_default,

				   &bench_mem_partition);

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