I need to know whether the Linux Kernel 2.6.x is a monolithic kernel or not. Please if you know anything about this or anything else related to this, post it.

It could be if you compile it that way. A monolithic kernel is one that doesnt' have any modules. It is simply one big bzImage. So, if you don't compile anything as a module then you have compiled a monolithic kernel.

Thank you very much Crashed_Again. If you know anything else about the Linux Kernel please post it here.

So we can say that generally the Linux Kernel is a monolithic one?

Typically OS people consider it somewhat of a hybrid, but it certainly leans more on the side of monolithic then it does on the side of a microkernel.

The general distinction is that microkernels contain a very small kernel that does as little as possible, and everything else is implemented as a module. This gives greater flexability in some cases, and also causes issues when you have to deal with module to module communication.

As far as the Linux Kernel goes, it does have support for modular code, but it is not anywhere near the modular flexability of the BSD series of kernels (or kernels like Darwin).

Even though the Linux kernel does have modules, it's still monolithic as the term is used by OS developers. This is because once you insert a module, it runs completely within the kernel. With a microkernel, significant chucks of stuff like the filesystem and memory manager actually run in user space (as normal processes), and only call on the kernel when they need to perform a priviledged operation like directly access hardware or flush the CPU's Translation Lookaside Buffer. Therefore, the Linux kernel is modular, but it's still, strictly speaking, monolithic.