DM:tools: add README.rst for acrntrace

Reviewed-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Yan, Like <like.yan@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>

tools/acrntrace/README.rst

@@ -0,0 +1,49 @@
+acrntrace
+#########
+
+DESCRIPTION
+###########
+acrntrace: is a tool running on SOS, to capture trace data.
+scripts directory includes scripts to analyze the trace data.
+
+USAGE
+#####
+Capture trace data on SOS
+
+ 1) Launch acrntrace
+   Capture buffered trace data:
+   # acrntrace
+   or clear buffer before tracing start:
+   # acrntrace -c
+   Trace files are created under /tmp/acrntrace/, directory name with time
+   string eg: 20171115-101605
+ 2) To stop acrntrace
+   # q <enter>
+ 3) Copy the trace data to linux pc
+   # scp -r /tmp/acrntrace/20171115-101605/   xxx@10.239.142.239:/home/xxxx/t
+   race_data
+
+Analyze the trace data on Linux PC
+
+ 1) Run the python script to analyze the vm_exits:
+   # acrnalyze.py -i /home/xxxx/trace_data/20171115-101605/0 -o /home/xxxx/trac
+     e_data/20171115-101605/cpu0 --vm_exit
+   - "--vm_exit" specify the analysis to do, currently, only vm_exit analysis
+     is supported.
+   - A preprocess would be taken out to make the trace data start and end with
+     an VM_ENTER, and a copy of original data file is saved with suffix ".orig";
+   - Analysis report would be given on the std output and in a csv file with
+     name specified via "-o outpu_file";
+   Script usage:
+   [Usage] acrnalyze.py [options] [value] ...
+   [options]
+   -h: print this message
+   -i, --ifile=[string]: input file
+   -o, --ofile=[string]: output file
+   --vm_exit: to generate vm_exit report
+
+   The scripts require bash and python2.
+
+BUILD
+#####
+# make