The asm is the same as asm, but can't be. This signifies a piece of inline assembly that the compiler must insert into its output code. It uses the often confusing inline assembly features of GCC to perform this, as follows : asm (. Instead, it was forced to introduce a global static variable called current to identify the process descriptor of the running process. getcurrent () is a routine for getting access to the taskstruct of the currently executing task. Linux 2.0 did not store the kernel stack and the process descriptor together.
#Current linux kernel upgrade
For example, current->pid returns the process ID of the process currently running on the CPU.Īnother advantage of storing the process descriptor with the stack emerges on multiprocessor systems: the correct current process for each hardware processor can be derived just by checking the stack, as shown previously. ahs: Debian 6.4 Easy kernel upgrade or downgrade with MX Package Installer.
#Current linux kernel code
The current macro often appears in kernel code as a prefix to fields of the process descriptor. This may turn out to be a problem when little dynamic memory is available. determine the current loaded kernel determine the default kernel determine which kernel versions are available on the system use grubby to manage kernels. One drawback to the shared-storage approach is that, for efficiency reasons, the kernel stores the 8-KB memory area in two consecutive page frames with the first page frame aligned to a multiple of 213. Movl $0xffffe000, %ecx andl %esp, %ecx movl %ecx, pĪfter executing these three instructions, p contains the process descriptor pointer of the process running on the CPU that executes the instruction. This is done by the current macro, which produces assembly language instructions like the following: To display/view current kernel parameters use the cat command: cat /proc/cmdline Sample outputs: BOOTIMAGE/boot/vmlinuz-4.15.0-42-generic root/dev/sda ro consoletty0 consolettyS0,19200n8 splash The above entry from /proc/cmdline file shows the parameters passed to the kernel at the time it is started. Improved extension searching, dynamic kernel. In fact, since the memory area is 8 KB (213 bytes) long, all the kernel has to do is mask out the 13 least significant bits of esp to obtain the base address of the process descriptor. Kernel (3.03), busybox, udev, eglibc, e2fsprogs, gcc-base, util-linux, and Xlibs. Then, on the breadcrumb navigation in that page, there is a link to the "kernels" section: Īnd by searching for linux-image- in that page, we find several kernels that can be installed in the system.The close association between the process descriptor and the Kernel Mode stack just described offers a key benefit in terms of efficiency: the kernel can easily obtain the process descriptor pointer of the process currently running on a CPU from the value of the esp register. If you search for the package name on Google: linux-image-4.15.0-29-generic, it also leads us to the page: So I conclude that Ubuntu 18.04 comes with Linux kernel 4.15. The Red Hat distributed kernel package has its own versioning, in this case, 957. From an operating system point of view, that kernel is built from source 3.10.0 available from the kernel package.
That means, for example with RHEL7.6, that it shipped with the kernel version branch 3.10.0-957. So I just search for linux-image- in the. Figure 1: Listing of RHEL releases with kernel versions. Then, since I know that my kernel is located at: /boot/vmlinuz-4.4.0-141-generic, to find the package name I did: apt-file search /boot/vmlinuz-4.4.0-141-generic
#Current linux kernel how to
You can see which packages are pre-installed as mentioned at: How to get a list of preinstalled packages?Į.g., on Ubuntu 18.04, the packages are at: You can get the list of the Ubuntu versions and their corresponding kernels from Wikipedia: 4.10 Warty Warthog 2.6.8
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