1.Describe the role of VFS and its location in the I/O stack. 2. Answer the following deeper questions: List the reasons why a thread would leave the current CPU. . Describe the advantages of virtual...

1.Describe the role of VFS and its location in the I/O stack. 2. Answer the following deeper questions: List the reasons why a thread would leave the current CPU. . Describe the advantages of virtual memory and demand paging1. List some static performance tools. 3. What is profiling? 4. Why would profilers use 99 Hertz instead of 100 Hertz? 5. What is tracing? 6. What is static instrumentation?