diff --git a/src/utest/perf/context_switch_tc.c b/src/utest/perf/context_switch_tc.c
index c095edec216..1ce4f3bf197 100644
--- a/src/utest/perf/context_switch_tc.c
+++ b/src/utest/perf/context_switch_tc.c
@@ -57,6 +57,22 @@ static void local_modify_time(rt_perf_t *perf)
         perf->real_time = perf->real_time - perf->tmp_time;
 }
 
+//我的改动----------------------------------
+static void local_modify_time(rt_perf_t *perf)
+{
+    if(perf)
+        perf->real_time = perf->real_time - perf->tmp_time;
+}
+//我的改动----------------------------------
+
+static void perf_thread_event1(void *parameter)
+{
+    while (1)
+    {
+        rt_sem_take(sem1, RT_WAITING_FOREVER);
+        rt_sem_release(sem2);
+    }
+}
 static void perf_thread_event1(void *parameter)
 {
     while (1)
@@ -65,7 +81,6 @@ static void perf_thread_event1(void *parameter)
         rt_sem_release(sem2);
     }
 }
-
 static void perf_thread_event2(void *parameter)
 {
     rt_perf_t *perf = (rt_perf_t *)parameter;
@@ -136,4 +151,45 @@ rt_err_t context_switch_test(rt_perf_t *perf)
 
     return RT_EOK;
 }
+/*
+ * 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
+ */