Questions tagged [linux-kernel]
The linux-kernel tag has no summary.
24 questions
6
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2
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How is async implemented natively?
How is async logic implemented natively without threads? What would be the high level structure of the system?
Is it just a separate OS thread that gets and pushes requests and results in 2 queues?
I ...
- 179
2
votes
0
answers
887
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Better alternative for cherry picking across heavily diverged branches
I'm currently trying to update the linux kernel used in a xilinx SoC, my company has an internal repo/fork of xilinx open source linux with a bunch of kernel drivers for our custom hardware & ...
- 29
-5
votes
2
answers
162
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Feasibility of adding drivers to linux kernel
I have question regarding Linux kernel , as far as I understand, to make Linux compatible with different machines and hardware , different device driver is added to the Linux .
I want to ask how much ...
- 31
2
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2
answers
319
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Can the operating system "break up" a memory allocation (Linux)?
Let's say a process (P1) is asking for 100 MB of memory, and the RAM looks like this:
[[50 MB free] [USED] [60 MB free] [USED]]
Since there are technically enough memory that are available (110MB ...
- 173
2
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3
answers
120
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Is it cleaner to decrement a sleeping process counter in the waking process or the woken process?
Say I have a reader and a producer that share a buffer. I have a wait queue for the reader to put itself in if there is no contents in the buffer when it reads. I also have an atomic variable for ...
- 131
1
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2
answers
187
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What does the inode point to in case of a device file other than the disk?
I know that the inode points to the actual disk blocks in the case of the normal file system. But what does it point to in the case of .... say .... the terminal device file. Does it point to the ...
- 79
0
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0
answers
108
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Assigning weights dynamically to ensure equal distribution
Scenario:-
The load balancer distributes traffic to backends with a simple round-robin mechanism.
With default config, each backend is assigned weight "1" so all backends are given equal chance of ...
- 109
-1
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1
answer
164
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How state updates to existing instances/sessions are generally done?
This is a very broad question, but maybe someone has a worthwhile response.
There is a general synchronization issue that often has to be solved, but always seems to be difficult. Here's an example:
...
- 115
3
votes
1
answer
127
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What security practices do I employ when building a library that requires low level root access to certain devices and files?
Backstory
I am writing a library that accesses the kernel module, uinput which allows you to create or take control of devices in /dev/input/event#, and insert events into them.
A simple usecase would ...
- 3,649
-1
votes
1
answer
137
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Implications of using Kbuild infrastructure in proprietary software [closed]
We have our own proprietary software that we are developing for commercial business. We want to sell the software and we do not have any problem in distributing the source code to our customers. Due ...
- 11
1
vote
1
answer
294
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Managing Linux Kernel Config Files in Revision control
I am working on some Linux kernel drivers for a specific embedded system (NVIDIA Tegra X1). I am using the kernel source provided by NVIDIA (L4T), which has its own default kernel config files. My ...
- 231
0
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1
answer
191
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Design improvement - C
Below is the design, that is implemented similar to design used in Linux/net/socket.c.
Below design provide List abstraction,
where, list.h provides List interface, show here
Background:
...
- 2,325
0
votes
3
answers
253
views
Can the Linux kernel be described as a Server?
I am developping an Android application that is using NDK in order to access to data from the Linux kernel. As you may know, this is done using IPC (Inter Process Communication) through Android's ...
- 119
-1
votes
1
answer
438
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Finding register parameters for system calls
By consulting various scattered tutorials and books, I've been able to learn that the 64-bit Linux "exit" system call is 60, and the status value is moved to edi. Similarly, "write" has call number 1, ...
- 101
1
vote
1
answer
2k
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What does using pointer in Linux kernel imply?
So far I was under the perspective that while working in the kernel code, working with memory implies working with long integers and not pointers because dereferencing pointers shouldn't be done in ...
0
votes
1
answer
80
views
Accessing struct attribute: casting vs field name
I was just going over some kernel code, I noticed that rb->__rb_parent_color = (unsigned long)p | color; is kinda wired. The first field of a struct is accessed by casting the pointer and not by ...
- 1,089
4
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1
answer
766
views
Why do some embedded projects shun cross-compiling?
As I've been getting into embedded systems I've noticed that some projects (Arch Arm and OpenBSD for example) frown upon cross compiling. What is the reasoning for this? Is a cross-compiled binary ...
-1
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1
answer
406
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Linux kernel development
I am trying to understand the linux kernel and there is one thing that is puzzling me for quite a while. As linux is used across variety of platforms (like smartphones,desktop,supercomputers etc) and ...
- 119
-1
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2
answers
1k
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Theoretical basis for (Linux) kernel development
KernelDevViewpoint (an apparently serious source) makes kernel development look like an accessible art. According to them:
Contrary to popular belief, kernel developers rarely need to know math
at ...
- 670
0
votes
2
answers
715
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Are monolith and microkernel design patterns or strategies?
What's the difference between a design pattern and a strategy?
Is the monolith actually an anti-pattern?
- 8,198
4
votes
3
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3k
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What is a good way to learn about multicore programming at the kernel level in Linux? [closed]
I am interested in multicore programming at the kernel level. I expect this affects many areas and is probably different for each architecture. What are some must read sections of the kernel? If I ...
- 4,978
2
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2
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399
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Estimation Techniques for Linux Kernel Development
I am working in Linux Kernel area and my work includes:
code study / Understanding
Porting (say from one kernel version to another kernel version)
Implementation of new kernel module / Device driver
...
- 123
39
votes
2
answers
85k
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How to become a Kernel/Systems/Device driver programmer? [closed]
I currently work in a professional capacity as a software engineer working with the Android OS. We work at integrating our platform as a native daemon among other facets of the project. I primarily ...
- 509
8
votes
3
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6k
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reading and understanding c code
I want to understand the linux kernel code, and I have been going through it but I am not able to get the full feel of what is happening(I am concentrating on network part of the linux kernel), so can ...
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