doc: add cpu usage in acrntrace

This patch adds the description of newly added parameter of acrntrace analyzer,
as well as the user guide that how to analyze the cpu usage of VMs in cpu sharing
case.

Tracked-On: #8621

Signed-off-by: Na Cui <na.cui@intel.com>

doc/tutorials/debug.rst

@@ -159,6 +159,16 @@ reason and times of each vm_exit after we have done some operations.
 
       vmexit summary information
 
+4. Use the command to get a summary of cpu usage in cpu-sharing case::
+
+      # acrnalyze.py -i /home/trace/acrntrace/20231122-054116/0 -o cpu_usage --cpu_usage
+
+   .. figure:: images/debug_image29.png
+      :align: center
+
+      cpu usage summary information
+
+
 Using Self-Defined Trace Event ID to Analyze Trace
 ==================================================
 

misc/debug_tools/acrn_trace/README.rst

@@ -75,6 +75,7 @@ Options:
 -f, --frequency=unsigned_int      TSC frequency in MHz
 --vm_exit                         generate a vm_exit report
 --irq                             generate an IRQ-related report
+--cpu_usage                       generate a cpu_usage report
 
 .. note:: The tool depends on TSC frequency to do time-based analysis. Be sure
    to configure the right TSC frequency that ACRN runs on. TSC frequency can be
@@ -140,6 +141,8 @@ data to your development computer (Linux system), and run the analysis tool.
    - The analysis report is written to stdout, or to a CSV file if
      a file name is specified using ``-o filename``.
    - The scripts require Python3.
+   - If want to analyze cpu usage of each VM in cpu-sharing case, use ``--cpu_usage``
+     to replace.
 
 Build and Install
 *****************