1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
/*
* Copyright (c) 2006-2025, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2025-07-03 rcitach test case for context_switch
* 2025-11-30 westcity-YOLO Add standardized utest documentation block
*/
/*
* Test Case Name: Kernel Core Context Switch Performance Test
*
* Test Objectives:
* - Measures thread context switch overhead using semaphore synchronization
* - Validates interrupt-to-thread response time in switch scenarios
* - Provides quantitative results in microseconds (us)
*
* Test Scenarios:
* - **Thread Switch Simulation**: Two threads alternate using semaphores
* - **High-Resolution Timing**: Hardware timer measures switch duration
* - **Stress Cycles**: Repeated switch operations (RT_UTEST_SYS_PERF_TC_COUNT times)
* - **Priority Handling**: Higher-priority thread execution (THREAD_PRIORITY+1)
*
* Verification Metrics:
* - Switch time within reasonable limits (< 100 us)
* - Consistent results across multiple test cycles
* - No memory leaks during test execution
* - Correct thread priority handling
*
* Dependencies:
* - RT_USING_PERF_TEST must be enabled
* - RT_USING_UTEST framework must be enabled
* - Hardware timer support (for high-resolution timing)
*
* Expected Results:
* [ PASSED ] [ result ] testcase (core.context_switch)
* - Performance data printed in structured table format
* - Final line: "=== Context Switch Test Results End ==="
* - Test executed via: `utest_run core.context_switch` in msh
*/
#include <rtthread.h>
#include <rthw.h>
#include <rtdevice.h>
#include <utest.h>
#include <utest_assert.h>
#include <perf_tc.h>
static rt_sem_t sem1, sem2;
static rt_sem_t complete_sem = RT_NULL;
static void local_modify_time(rt_perf_t *perf)
{
if(perf)
perf->real_time = perf->real_time - perf->tmp_time;
}
static void perf_thread_event1(void *parameter)
{
while (1)
{
rt_sem_take(sem1, RT_WAITING_FOREVER);
rt_sem_release(sem2);
}
}
static void perf_thread_event2(void *parameter)
{
rt_perf_t *perf = (rt_perf_t *)parameter;
for (rt_uint32_t i = 0; i < RT_UTEST_SYS_PERF_TC_COUNT; i++)
{
perf->tmp_time = 0;
rt_perf_start(perf);
rt_sem_take(sem2, RT_WAITING_FOREVER);
rt_sem_release(sem2);
rt_perf_stop(perf);
rt_mutex_take(perf->lock,RT_WAITING_FOREVER);
perf->count -= 1;
perf->tmp_time = perf->real_time;
rt_mutex_release(perf->lock);
rt_perf_start(perf);
rt_sem_take(sem2, RT_WAITING_FOREVER);
rt_sem_release(sem1);
rt_perf_stop(perf);
}
rt_sem_release(complete_sem);
}
rt_err_t context_switch_test(rt_perf_t *perf)
{
rt_thread_t thread1 = RT_NULL;
rt_thread_t thread2 = RT_NULL;
# if __STDC_VERSION__ >= 199901L
rt_strcpy(perf->name,__func__);
#else
rt_strcpy(perf->name,"context_switch_test");
#endif
perf->local_modify = local_modify_time;
sem1 = rt_sem_create("sem1", 1, RT_IPC_FLAG_FIFO);
sem2 = rt_sem_create("sem2", 0, RT_IPC_FLAG_FIFO);
complete_sem = rt_sem_create("complete_sem", 0, RT_IPC_FLAG_FIFO);
thread1 = rt_thread_create("perf_thread_event1", perf_thread_event1, perf,
THREAD_STACK_SIZE, THREAD_PRIORITY, THREAD_TIMESLICE);
if (thread1 == RT_NULL)
{
LOG_E("perf_thread_event1 create failed.");
return -RT_ERROR;
}
thread2 = rt_thread_create("perf_thread_event2", perf_thread_event2, perf,
THREAD_STACK_SIZE, THREAD_PRIORITY + 1, THREAD_TIMESLICE);
if (thread2 == RT_NULL)
{
LOG_E("perf_thread_event2 create failed.");
return -RT_ERROR;
}
rt_thread_startup(thread1);
rt_thread_startup(thread2);
rt_sem_take(complete_sem, RT_WAITING_FOREVER);
rt_perf_dump(perf);
rt_thread_delete(thread1);
rt_sem_delete(complete_sem);
rt_sem_delete(sem1);
rt_sem_delete(sem2);
return RT_EOK;
}
|
