Questions tagged [os-kernel]

Questions about the fundamental component of an operating system, which manages the allocation of resources to applications.

13 questions with no upvoted or accepted answers
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Are these modern operating systems monolithic or microkernel?

I know that (at least at its conception) Linux and Mac OS were both monolithic kernels. My question is, what kind of kernels are Linux, Mac OS, and Windows today and why?
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Is “capability-based security” vs “hierarchical-protection-domain based security” a false dichotomy?

The wikipedia page on capability-based security states: Capability-based security is to be contrasted with an approach that uses hierarchical protection domains. However, in order to implement ...
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Why do we need volume as an abstraction on top of partition?

I'm curious about what do we need volume as an abstraction on top of hardware partition? What problem it tries to solve? What is the limitation of this concept?
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User-level threads and information available to the kernel

User-level threads are transparent to the kernel. How is htop able to show user-level threads running on my system? I know that those threads are user-level threads ...
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467 views

Do user level threads take advantage of multi processing?

I asked this question here on stackoverflow, but maybe because of off-topic over there, it didn't received proper response. Does user level threads take advantage of multiprocessing ? I read one such ...
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local addresses in segmentation

I'm reading "Understanding Linux Kernel 3rd edition" and it starts talking about memory segments. It says that a logical address is: Included in the machine language instructions to specify the ...
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Non Preemptible Kernel

I am trying to understand non preemptible kernel in linux 2.4 and can't find answers for those two questions: Suppose Process A is running in kernel space and a hardware interrupt occurred can it cut ...
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If micro-kernels were parents, how exactly do they just receive messages from their kids (software) and pass it to a webcam?

I don't understand the last para., but I edited its typos. Please explain like I'm 5. Picture. What does "they know how to do it and those parents do everything for the children" mean? &...
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Is a signal handler invocation an upcall?

I am struggling with the definition of an upcall. Presumably, an upcall is a mechanism that allows the kernel to execute a function in userspace. By this definition, an invocation of a signal handler ...
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Is it possible to run more than one Turing Machine emulator using only one processor kernel?

I had this question on computer architecture exam and can't find an answer anywhere. Is it possible to run several Turing Machine emulators at once using only one processor kernel? a) Yes, by ...
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Operating Systems - Why Stack Growths For a Fixed Parameter N Are Inconsistent?

I am taking an Operating Systems course and as a project, we are printing the content of the PCB of a process from task_struct of that process and its mm_struct & vm_area_struct pointers. During ...
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335 views

What are disadvantages of a Operating System that recognise file extensions ?

When Operating system recognise the file types It has several advantages like 1. avoid mistakes like trying to print a object file that produce garbage output but I can't think about disadvantages ...
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need for an example of synchronous but non periodic interrupt

I know that synchronous interrupts are interrupts that occur with a clock tick (after finishing an instruction) and I think that periodic if they happen in every n ticks of the clock. To get a better ...