under test, not sure no errors

upstream_ref/xllm/tools/README.md

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+# NPU Timeline Generation Guide
+## Prerequisites
+- Python environment
+- Chrome browser (for visualization)
+## Implementation Steps
+### 1. Code Modification
+#### Register the subscriber
+Add the following at the beginning of your program:
+```cpp
+MsptiMetrics::register_subscriber();
+```
+#### Add tracing to ACLNN functions (work for msprof as well)
+Insert the following macro in your ACLNN functions where you want to measure performance:
+```cpp
+LLM_MSTX_RANGE();
+```
+#### Release the subscriber
+Add this at the end of your program:
+```cpp
+MsptiMetrics::release_subscriber();
+```
+### 2. Log Processing
+After running your program, process the generated log file using the timeline script:
+```bash
+python npu_timeline.py -i custom_log.log -o custom_output.json
+```
+### 3. Visualization
+Open Chrome browser
+Navigate to: chrome://tracing
+Load the generated JSON file: custom_output.json