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tests: kernel: added tests for timeslice reset

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Added test cases to verify timeslice reset among thread context
switching.

Jira: ZEP-948

Signed-off-by: Sharron LIU <sharron.liu@intel.com>
This commit is contained in:
Sharron LIU 2017-05-04 10:11:04 +08:00 • committed by Anas Nashif
commit ab6d4c1a42
5 changed files with 102 additions and 2 deletions
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1
tests/kernel/threads_scheduling/schedule_api/prj.conf
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@ -1,2 +1,3 @@
CONFIG_ZTEST=y
CONFIG_IRQ_OFFLOAD=y
CONFIG_TIMESLICING=y

2
tests/kernel/threads_scheduling/schedule_api/src/Makefile
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@ -1,4 +1,4 @@
include $(ZEPHYR_BASE)/tests/Makefile.test
obj-y = main.o test_sched_priority.o test_sched_timeslice_and_lock.o
obj-y += test_sched_is_preempt_thread.o
obj-y += test_sched_is_preempt_thread.o test_sched_timeslice_reset.o

3
tests/kernel/threads_scheduling/schedule_api/src/main.c
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@ -28,7 +28,8 @@ void test_main(void *p1, void *p2, void *p3)
ztest_unit_test(test_time_slicing_disable_preemptible),
ztest_unit_test(test_lock_preemptible),
ztest_unit_test(test_unlock_preemptible),
ztest_unit_test(test_sched_is_preempt_thread)
ztest_unit_test(test_sched_is_preempt_thread),
ztest_unit_test(test_slice_reset)
);
ztest_run_test_suite(test_threads_scheduling);
}

1
tests/kernel/threads_scheduling/schedule_api/src/test_sched.h
View file

@ -32,5 +32,6 @@ void test_time_slicing_disable_preemptible(void);
void test_lock_preemptible(void);
void test_unlock_preemptible(void);
void test_sched_is_preempt_thread(void);
void test_slice_reset(void);
#endif /* __TEST_SCHED_H__ */

97
tests/kernel/threads_scheduling/schedule_api/src/test_sched_timeslice_reset.c Normal file
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@ -0,0 +1,97 @@
/*
* Copyright (c) 2017 Intel Corporation
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <ztest.h>
#define STACK_SIZE 512
#define NUM_THREAD 3
static char __noinit __stack tstack[NUM_THREAD][STACK_SIZE];
/* slice size in millisecond*/
#define SLICE_SIZE 200
/* busy for more than one slice*/
#define BUSY_MS (SLICE_SIZE+20)
/* a half timeslice*/
#define HALF_SLICE_SIZE (SLICE_SIZE >> 1)
K_SEM_DEFINE(sema, 0, NUM_THREAD);
/*elapsed_slice taken by last thread*/
static s64_t elapsed_slice;
/*expected elapsed duration*/
static s64_t expected_slice[NUM_THREAD] = {
HALF_SLICE_SIZE,/* the ztest native thread taking a half timeslice*/
SLICE_SIZE, /* the spawned thread taking a full timeslice, reset*/
SLICE_SIZE /* the spawned thread taking a full timeslice, reset*/
};
static int thread_idx;
static void thread_tslice(void *p1, void *p2, void *p3)
{
s64_t t = k_uptime_delta(&elapsed_slice);
#ifdef CONFIG_DEBUG
TC_PRINT("thread[%d] elapsed slice %lld, ", thread_idx, t);
TC_PRINT("expected %lld\n", expected_slice[thread_idx]);
#endif
/** TESTPOINT: timeslice should be reset for each preemptive thread*/
zassert_true(t <= expected_slice[thread_idx], NULL);
thread_idx = (thread_idx + 1) % NUM_THREAD;
u32_t t32 = k_uptime_get_32();
/* Keep the current thread busy for more than one slice, even though,
* when timeslice used up the next thread should be scheduled in.
*/
while (k_uptime_get_32() - t32 < BUSY_MS)
;
k_sem_give(&sema);
}
/*test cases*/
void test_slice_reset(void)
{
u32_t t32;
k_tid_t tid[NUM_THREAD];
struct k_thread t[NUM_THREAD];
int old_prio = k_thread_priority_get(k_current_get());
thread_idx = 0;
/*disable timeslice*/
k_sched_time_slice_set(0, K_PRIO_PREEMPT(0));
for (int j = 0; j < 2; j++) {
k_sem_reset(&sema);
/* update priority for current thread*/
k_thread_priority_set(k_current_get(), K_PRIO_PREEMPT(j));
/* create delayed threads with equal preemptive priority*/
for (int i = 0; i < NUM_THREAD; i++) {
tid[i] = k_thread_create(&t[i], tstack[i], STACK_SIZE,
thread_tslice, NULL, NULL, NULL,
K_PRIO_PREEMPT(j), 0, 0);
}
/* enable time slice*/
k_sched_time_slice_set(SLICE_SIZE, K_PRIO_PREEMPT(0));
k_uptime_delta(&elapsed_slice);
/* current thread (ztest native) consumed a half timeslice*/
t32 = k_uptime_get_32();
while (k_uptime_get_32() - t32 < HALF_SLICE_SIZE)
;
/* relinquish CPU and wait for each thread to complete*/
for (int i = 0; i < NUM_THREAD; i++) {
k_sem_take(&sema, K_FOREVER);
}
/* test case teardown*/
for (int i = 0; i < NUM_THREAD; i++) {
k_thread_abort(tid[i]);
}
/* disable time slice*/
k_sched_time_slice_set(0, K_PRIO_PREEMPT(0));
}
k_thread_priority_set(k_current_get(), old_prio);
}