presentation on kernels with their importance and disadvantages

1. ∑ Kernel: kernel is a bridge between applications and the actual data
processing done at the hardware level
∑ Kernel basic facilities are :1)process management,
2) Memory management,
3) Device management,
4) System calls
∑ Some of the kinds of kernels
are:1)monolithic,2)microkernel,3)hybrid kernel
∑ In monolithic kernel all operating system services run along
with the main kernel thread
∑ it is traditionally used by Unix-like operating systems
∑ in this less software was used so it is faster as it is single piece of
software it should be smaller both in source and compiled forms
∑ less code generally means fewer bugs which can translate to fewer
security problems
∑ most work in the monolithic kernel is done via system calls
∑ coding in the kernel space is hard since you cannot use common
libraries
∑ bugs in one part of the kernel have strong side effects
∑ kernel often become very huge and difficult to maintain
∑ since the modules run in the same address space, a bug can bring down
the entire system
• application
•vfs,systemcall
•ipc,file system
• scheduler,virtual memory
• device drivers,dispatcher
• hardware

2. ∑ disadvantage of monolithic kernel is the they are not portable
that is they must be rewritten for each new architecture that the
operating system is to be used on