The kernel of operating systems popularly known as Linux, or sometimes GNU/Linux.
226
votes
7answers
20k views
Understanding the Linux kernel source
I am trying to understand how a function, say mkdir, works by looking at the kernel source. This is an attempt to understand the kernel internals and navigate between various functions. I know mkdir ...
19
votes
7answers
9k views
Linux Kernel: Good beginners' tutorial
I'm interested in modifying the kernel internals, applying patches, handling device drivers and modules, for my own personal fun.
Is there a comprehensive resource for kernel hacking, intended for ...
8
votes
3answers
429 views
Given a git patch id, how to find out which kernel release contains it?
Assume I have some issue that was fixed by a recent patch to the official Linux git repository. I have a work around, but I’d like to undo it when a release happens that contains my the fix. I know ...
2
votes
2answers
208 views
Linux kernel is not finding the initrd correctly
I had compiled a linux kernel and I wanted to debug it in QEMU. I created a file to boot from by doing the commands
$ qemu-img create -f raw disk.img 200M
$ mkfs.ext2 -F disk.img
# mkdir /mnt/rootfs
...
2
votes
1answer
536 views
Running bzImage in QEMU
So I compiled a linux kernel by doing make menuconfig and make. I was trying to run the bzImage in qemu, by doing "qemu -kernel bzImage" but it didn't work out:
How can I fix it? How can I run the ...
0
votes
2answers
561 views
After removing linux Grub error
I have a dual boot Windows & Linux system. I removed the Linux partition, but after that I am not able to go in to Windows XP. It is not booting. It gives me a GRUB error.
-2
votes
2answers
364 views
Entry point of linux kernel [closed]
In the linux kernel is there a file that I can start to add my code, ex. load libraries?
thanks
23
votes
1answer
1k views
High CPU usage with CFS?
I asked a previous question to try and isolate the source of an increase in CPU usage when moving an application from RHEL 5 to RHEL 6. The analysis that I did for that seems to indicate that it is ...
3
votes
0answers
5k views
Enabling IOMMU in the kernel for graphics card pass-through
Short question:
How can I turn on the intel_iommu setting in the Linux kernel? I run a Debian host, using the grub2 bootloader. Documentation I've seen says to edit /boot/grub/menu.lst, which seems ...
14
votes
2answers
458 views
The UEFI & SecureBoot impact, how severe?
I'm planning to buy a new laptop in the coming days, and I'm quite impressed with new, cool Ultrabooks. As a long-time GNU/Linux user, I'll of course install a distro of my choice on it.
Chances are ...
8
votes
1answer
2k views
Isolating cause of higher CPU usage on RHEL 6 vs RHEL 5
I'm currently looking to move our system from RHEL 5 to RHEL 6, but I've run into a snag with unexpectedly high CPU usage on the RHEL 6 machines. It appears that this may be due at least in some part ...
6
votes
1answer
814 views
Load Linux bzImage in QEMU?
I compiled a Linux by doing "Make menuconfig" then make and now I have compiled the most recent version of Linux. How can I load the kernel into QEMU?
5
votes
1answer
312 views
What are the main differences between Unix and Linux kernels today?
I know that many of the same programs run flawlessly on top of both kernels. I know that historically, the two kernels came from different origins. I know philosophically too that they stood for ...
4
votes
2answers
334 views
How is a Linux kernel capable of accessing its assigned initramfs/initrd?
I'm trying to understand the boot process of a machine as a whole from the time you hit the power button. There's this one piece from bootloader to initramfs stage I don't quite understand among some ...
2
votes
1answer
168 views
Is it possible to run any distro from RAM from within an .iso saved on an NTFS file system?
Running entirely from RAM been done on various distros such as Slax, DamnSmallLinux, and newer Ubuntu versions, and since I have 8GB it seems reasonable that I could run many distros entirely from RAM ...
1
vote
2answers
355 views
Running linux kernel in Virtualbox
I just built a Linux kernel on Ubuntu and now I want to make it run on VirtualBox. I wanted it to be in an img format. I created a hard drive image by doing the commands
$ qemu-img create disk.img ...
1
vote
1answer
745 views
Unpacking kernel-source rpm off-system (OpenSuse)?
I'm using OpenSuse 11.2 from a LiveUSB USB flash/stick, which arguably has not much place on it. I need to get the Linux sources for this version of OpenSuse, as they are needed to build a driver for ...
