These are separate and unrelated tasks. To check the version of the running kernel in Linux, use the command uname -r. To upgrade the kernel, either use your distro's package manager (if any) to update the system, or download and compile the Linux kernel source.
To upgrade your Linux kernel / compile a newer version, you would need: 1. A working copy of GCC supported by the kernel version.. The latest GCC and the latest kernel version should be fine. 2. Preferably either the ncurses or GTK development libraries. It is possible to configure the kernel without these, but you either need a previous configuration or a lot of patience using the old question/answer configuration script. 3. Enough free space on your computer for the kernel sources. 100 MB should be fine; this isn't really an issue on modern computers. 4. A competent understanding of what components are needed for your computer. Most of the device support should be easy, but many people get confused in the networking section.
It is a kernel version that enables realtime.
wikipedia.org/wiki/Kernel_%28computing%29 A computer kernel is basically the "big brother" application and manages all other applications currently running on your computer, and controlling their access to cpu, ram, hard drive, and any devices currently connected (through device drivers of course). There's never more than 1 kernel running on your computer at a time, however if you have multiple operating systems installed on your computer they each have their own kernel (windows vista, windows 7, windows xp, linux, mac, etc...). If you install and run a virtual machine then another kernel will run in that and you could technically have multiple kernels running on your computer.
All versions of the Linux kernel are "full featured." The latest stable version of the Linux kernel as of May 17, 2011 is 2.6.38.6.
The 2.4 version of the Linux kernel was released in 2001.
the latest stable version is 3.4.4
Let's assume the kernel version is 2.1.xy.z. The .1 is the minor version number and if it is even, the kernel is stable. If it is odd, which in this case "1" is odd, it is a development or not stable release.
2.6.18
3.2.0
Debian 5.0 (Lenny) debuted with the 2.6.26 kernel.
The current version of the Linux kernel is 4.14 (November 12), whereas the LTS kernel is at 4.9 (November 21).
The current Linux kernel version is 3.9.