Any guidance for analyzing bootchart.png

[Yu FranzKafka]

Thanks for this awesome project，and I am using this tool to get bootchart.png,but I am confusing for the result.I couldn't find any useful infomation to analyze the result.

I upload my result here:

Especially the third one,the abscissa is time,and we got many progresses here,there are different colors to represent diferent factors,such as Unit.sleep(I/O) ,I noticed that there are serval progresses named pcie_itssm_dete,isp-recv-msg,recv_thread etc,during the boot time it seems that they have long 'pink' time,what does this mean?it means that the process occupied too much I/O at this moment?

If some of you can help me analyze this it would be a great favor.