The linux-kernel tag has no wiki summary.
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Linux snapshotting issues
Is there any way to deal with incoming writes while a backup is in progress in linux. Example, you are writing to your sql database and lvm snapshotting at the same time. This will result in corrupted ...
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1answer
31 views
compressed and uncompressed kernel on an embedded device
I have been using several different embedded boards that store kernel, init files, filesystem, etc. on partitions of a (micro)SD card. I notice in the example usage or instructions that compressed ...
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0answers
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Why does Linux 3.2 kernel (Debian backport) hang during boot?
I wanted to upgrade the Linux kernel on my Debian wheezy (stable) on Thinkpad T60. I installed linux-image-3.2.0-0.bpo.4-686-pae, version 3.2.41-2~bpo60+1. The problem is it hangs during boot, just ...
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2answers
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What does “INFO: task XXX blocked for more than 120 seconds” exactly mean on Linux?
I had this message in my kernel log. I would like to know what it means technically: under what conditions does the kernel display this message about a task?
For the record, my blocked task was ...
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1answer
35 views
building/compiling kernel headers
I am compiling kernel 3.4 and 3.8 for different target devices. I would like to install compat wireless driver which requires kernel header. Could anyone tell me how I can compile/build the kernel ...
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2answers
50 views
Are FIFO, pipe & Unix domain socket the same thing in Linux kernel?
I heard that FIFOs are named pipes. And they have exactly the same semantics. On the other hand, I think Unix domain socket is quite similar to pipe (although I've never made use of it). So I wonder ...
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1answer
52 views
Real mode and loading linux kernel confusing
As far as know, protected mode will activated in kernel and in grub stage it still real mode. My misunderstanding is: In real mode, total memory available for use is less than 1MB but how grub can ...
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0answers
29 views
How to find code called by suspend_ops->enter(state); [migrated]
I am trying to understand the linux kernel power management at a low level and have finally got stuck since my C is not very strong. I am able to follow the code down to where it calls ...
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EXT3 file operations [migrated]
I am trying to follow how Linux deals with EXT3 files.
I am looking at fs/ext3/file.c where there are file operations that deal with the files are present:
const struct file_operations ...
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2answers
64 views
files in /proc/$PID (e.g. ssh-agent, Chrome) are not owned by user but by root
I am just answering another question here :-) and thus had a look – wanted to have a look at /proc/$PID/fd of ssh-agent in order to find out which socket it uses. But I can't. I am quite surprised to ...
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3answers
53 views
What considerations need to be made when choosing the version of kernel for an embedded device?
I have used buildroot to successfully create a kernel, root file system and cross-compilers to enable me to write application code to run on an embedded device. Currently I have no need to write ...
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0answers
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What is the relation between the Linux device drivers “domains”?
As I'm reading about the Linux device drivers and power management API I keep encountering terms like "system level", "subsystem", "platform", "class", and so on.
What is the relation between them? ...
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39 views
Decreasing mouse sensitivity at kernel level
I have developed a custom-GUI Server, which runs on virtual console of Linux.For mouse-handling purpose, it reads the mouse device file
/dev/input/mice
and retrieves the event data and updates ...
3
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1answer
44 views
How do you compile your own kernel on a RHEL6 system?
In RHEL6, the kernel is 2.6.32. What is the procedure to compile your own kernel?
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1answer
28 views
Does alsa depend on the kernel version?
Lately I had nothing but trouble with my sound setup. The full chain looks like this:
alsa (pulse plugin)-> pulseaudio (jack plugin) -> jackd -> firewire soundcard
This works fine, except ...
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2answers
80 views
How do I extract the filesystem image from vmlinux.bin?
jor1k ships a vmlinux.bin. I think there is an initrd inside, cause I don't know where else it would be. I am trying to extract the filesystem image so I can change it, but I don't know how to.
I ...
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4answers
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Why isn't Linux embraced as the official GNU kernel?
While I knew for quite some time the existence of Hurd, and its mission as the official GNU Operating System kernel, I was wondering how come Linux is not embraced as the official GNU kernel over the ...
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0answers
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Determine whether kernel built-in driver supports a device
I'm trying to find a way to accurately determine whether all the hardware on some system has a valid driver installed either via a kernel module or built-in to the kernel.
I'm working with RHEL 5.5 ...
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2answers
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Does linux modules/drivers belong to kernal space or user space
Some articles say that modules/drivers belong to kernel space as it take part in forming the kernel; (reference: http://www.freesoftwaremagazine.com/articles/drivers_linux)
While others say that ...
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1answer
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“Acpi-State” in slabtop's output gets increased — what is it? Is it a bug?
Since boot it gets increased occupying even more RAM than anything else:
Active / Total Objects (% used) : 680608 / 719176 (94.6%)
Active / Total Slabs (% used) : 17390 / 17390 (100.0%)
...
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3answers
129 views
How to determine which module taints the kernel?
My kernel keeps panicking when connected to a certain wireless network. I'd like to send a bug report but my kernel is apparently tainted. From /var/log/messages:
Apr 17 21:28:22 Eiger kernel: ...
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1answer
75 views
How should I solicit feedback from a tree maintainer for patches sent to the lkml?
I have submitted a patch to the linux kernel that has gotten several reviews and gone through a couple iterations on the mailing list. It has been ACKed and reviewed by two developers, but they say ...
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Problem with keyboard backlight in Asus N56VZ. Suspected asus-wmi problem
I use Ubuntu mainline kernel 3.8.x and 3.9.RCx on Linux Mint 14. On those kernels keyboard backlight is not working very consistently.
Sometimes kernel boots and keyboard brightness is available. ...
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47 views
Building and loading modules Beagle board - xM Rev C
I'm using Linux kernel 2.6.38 on Beagle board - xM Rev C and I want to build and load modules. I'm selected HID gadget as a module in menuconfig ([M] HID Gadget) but I don't know how to load g_hid.ko ...
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2answers
46 views
how to uniformly execute benchmarks on linux
I am doing project on adapting Linux for scalable multi core architecture. I am testing Linux's performance with benchmarks. When I am running the benchmarks in the system then other programs like ...
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1answer
107 views
sigaction(7): semantics of siginfo_t's si_code member
I've got a long-running program (becomes a daemon with daemon(3) call) that exits on Signal 11 (Segmentation Violation) every so often. I can't tell why. So, I wrote a SIGSEGV handler, set using the ...
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0answers
80 views
GRUB2 and kernel vga= parameter
According to the documentation, use of the vga= kernel parameter is deprecated as of GRUB2. The fact that some newer kernels don't seem to support it anymore on certain adapters is of no concern as ...
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1answer
61 views
Address types used in Linux
I am trying to understand the Memory address types used by the Linux kernel, which are
User virtual address
Physical address
Bus address
Kernel logical address
Kernel virtual address
I understood ...
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1answer
28 views
What are the other congestion control algorithms specially designed for lossy Wireless Networks like LTE and WiMax?
I am trying different congestion control algorithms for getting maximum throughput and minimum delay across my setup for TCP flow.Please suggest other available algorithms apart from
Veno, ...
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1answer
55 views
Install x11 on my own linux system
I have developed my own tiny linux file system using buildroot and busybox. I used linux-2.6.38.8 kernel configured and cross-compiled for target system(X86) according to needs.Now the filesystem is ...
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0answers
77 views
Unable to install the selected kernel
I have problem with my DVD drive. It's corrupted and when I'm trying to install Ubuntu it stucks (even with the miniISO)
I was able to successfully start the OS from system rescue CD.
I'd like to ...
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105 views
make: i686-linux-gcc: Command not found
I am using Ubuntu-11.10 amd64 and trying to cross-compile a linux-2.6.38.8 kernel for a 32-bit target.I tried
make CROSS_COMPILE=i686-linux- ARCH=i386
But I got error
make: i686-linux-gcc: ...
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315 views
Unable to install Atheros AR8161 Ethernet controller driver for centOS 6
I've installed CentOS 6.3. However, eth0 does not show up on ifconfig.
So I figured out that I need to install alx Ethernet driver from here.
Since my internet is not working, as ethernet drivers are ...
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2answers
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How is the kernel loaded?
I am trying to understand the Linux boot process, and after reading quite some amount of documentation there is one point that I still can't seem to understand.
So the basicis is BIOS -> Grub MBR -> ...
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2answers
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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 ...
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1answer
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How to run Different congestion control algorithms in FEDORA 17 ..?
Earlier versions of Fedora has different loadable kernel modules which includes diffrent congestion control algorithms etc at (/lib/modules/"kernel-name"/kernel/ipv4).These are present in the form of ...
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1answer
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What would be the best way to work around this glibc problem?
I administer a Gentoo Hardened box that uses file capabilities to eliminate most of the need for setuid-root binaries (e.g. /bin/ping has CAP_NET_RAW, etc).
Infact, the only binary I have left is ...
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No make target “uImage” with Buildroot 2013.05
After enabling Linux Kernel option and setting the Kernel binary format to uImage, I always get the following error:
make[1]: * No rule to make target `uImage'. Stop.
My buildroot configuration is ...
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1answer
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Linux Operating system recovery after abnormal termination
How does the operating system (Linux) while rebooting checks whether abnormal termination happened during last shutdown and then does the file system consistent checks etc if required ?
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Preparing an initrd for qemu [duplicate]
I have compiled a bzImage but when I try to run it in qemu I get a kernel panic because I don't have an initrd file. So I create one by following the steps in this question but I cannot get it to ...
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2answers
220 views
Why TCP TIME-WAIT State is present at both ends after a connection termination?
I am reading how the TCP states work and especially the connection termination part.
All of the books or online material I read, shows that for the termination procedure these states are followed ...
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2answers
174 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
...
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5answers
92 views
How to know what to enable in the kernel?
I'm a gentoo user. When compiling the kernel there are a lot of options which one may enable depending on one's hardware.
My question is how to know what to enable/disable, I'm aware of the hardware ...
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1answer
196 views
Installing qemu-img on ubuntu 11.04
I am developing a linux kernel and I am trying to to debug it in QEMU. I want to be able to run it in QEMU but it stops because I do not have a virtual hard drive to boot it(using the -hda command). I ...
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2answers
124 views
Writing a Linux file system for NFS
I want to write my own custom file system in Linux. Can I share it over standard NFS without making any changes to the local NFS server? If so what VFS APIs are required to be implemented by my file ...
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1answer
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Multi kernel usage in Linux PC(UBUNTU)
I have 2.6.32-21-generic , 2.6.32-38-generic and 3.0.0-20-generic.
My current kernel is:-
$ uname -r
2.6.32-38-generic
I want to use different kernel that is 2.6.32-21-generic.
How can I do that?
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Compiling the Linux kernel in Eclipse
I have a Mac running Snow Leopard and I know that I cannot compile the Linux kernel. I have used a Linux VM (virtualbox) to compile the kernel but I was wondering if I could compile it on Eclipse ...
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1answer
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Invoking memory compaction on linux 2.6.35 kernels and beyond
This LWN article about memory compaction indicates that memory compaction can be invoked in the linux kernel by
Writing a node number to /proc/sys/vm/compact_node, causing compaction to happen on ...
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1answer
85 views
How can I disable IPv6 in custom built embedded setup
I have an embedded system built using buildroot. I have had a number of network issues, one of which is that my machine cannot see its gateway despite it being on the same subnet. I have tried using ...
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1answer
84 views
core dump help— linux
I'm trying to understand the core dump generation. Is the core dump generated separately for a user space application process crash and the kernel level crash? Is the ulimit -c for both kinds? Can you ...
