Linux Kernel

• Allocate memory in driver
• what is IRQ? how will you register your IRQ no? Are you sure you willget the IRQ no you have requested? What if you don't get?
• Difference bet insmode and modprobe
• list currently available drivers
• How to access userspace memory from kernel
• Where will you place filesystem? above device driver or below it?
• What is the use of file->private_data in a device driver structure ?
• What are the two types of devices drivers from VFS point of view ?
• What is the use of register_chrdev and unregister_chrdev ?
•  How will you make interrupt handlers as fast as possible ?
•   What are the types of softirqs ?
•   Difference between Timer Softirq and Tasklet Softirq ?
•   What are tasklets ? How are they activated ? when and How are they initialized ?
•   What is task_struct and how are task states maintained ?
•    When will you use rwlock instead of spinlock ?
•   Can spinlock/rwlock be used in Interrupt handler ?
•   Tell about the Memory Layout of a Process in Linux .
•   How will you trace the system calls made into the kernel of lInux ?
•   What is mmap ? MMAP & malloc ? MMAP & brk ? MMAP adv & dis-adv.
•   Tell the relation between Malloc and MMAP
•  Advantages of MMAP over Read ?
•   Tell the role of brk() in malloc / Tell the relation between heap and brk?
•  Example of using MMAP and MUNMAP in C ?
•  Tell about the method/steps in Linux Kernel Compilation.
•  What is Kmalloc and how does it differ from normal malloc ? or Why can't we use malloc in kernel code ?
•   What happens as soon as a packet arrives from the network in Linux ?
•  What is a stack frame, stack pointer & frame pointer ?
•   What is a profiler ?
•   How do you determine the direction of stack growth ?