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-1
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0answers
29 views

Translating a logical address into a physical address [on hold]

There is a logical address 87536 which needs to be translated into physical address. Here is the page table Page table:(page # - Page Frame #) ...
5
votes
1answer
55 views

Difference between hypervisor and exokernel

An hypervisor (1st type) is a software that creates and run virtual machines, managing guest's operative systems's requests to the hardware. An exokernel is an operative system kernel, that let's ...
3
votes
1answer
45 views

Session Memory in the Windows Kernel

While reading the paper Effective Data-Race Detection for the Kernel by John Erickson and Madanlal Musuvathi. I was stuck on a slightly tricky sentence. "Similarly, a range of kernel-address space, ...
0
votes
1answer
46 views

Is my understanding of kernels correct?

System: Application OS: Scheduler, VMM, IPC, FS Drivers, dispatchers, VFS The above would be a monolithic kernel. In a monolithic kernel all core OS functions are separate from user spaaaaaace. ...
2
votes
2answers
91 views

Is there a shell between the kernel and hardware

First and foremost, i know what a shell, kernel is. Now the dilemma. Today i had my systems viva in college. The examiner asked me is there a shell between the hardware and the kernel. Obviously, i ...
0
votes
0answers
27 views

Support Vector Machines as Neural Nets?

This is more of a conceptual question. I have learned about Neural Nets, and I have some clue as to how Support Vector Machines work. I read somewhere however that given the appropriate kernel (is ...
4
votes
0answers
31 views

Why are kernel methods with RBFs effective for handwritten digits (letters) classification?

The question emerged while reading Ch. 3 of Rasmussen & Williams http://www.gaussianprocess.org/gpml/. In the end of this chapter, the authors gave results for the problem of handwritten digits ...
5
votes
2answers
477 views

Microsoft Singularity : why closed [closed]

I'm talking about this one research project: but MS closed it in 2008. I've read many articles about it, about high perfomance (30+% faster against tradinional monolithic kernels), much more secure ...
3
votes
2answers
135 views

Dangerous interrupts

Let's say we have a fictional operating system in the user mode. Whenever an interrupt or a trap occurs, the os would switch to the Kernel mode jumping to the address determined from the interrupt ...
3
votes
1answer
155 views

What is the difference between a module in a monolithic kernel and a server in a microkernel?

I´m not exactly sure what kind of impact these two things have on kernel design. Are servers more flexible because of running in user space, for instance, and does adding a module require a new build ...
5
votes
1answer
407 views

What is the purpose of M:N (Hybrid) threading?

In other words, what advantages does Hybrid threading have over 1:1 (kernel only) and N:1 (user only) threading? This is a follow-up to What is the difference between user-level threads and ...
14
votes
1answer
15k views

What is the difference between user-level threads and kernel-level threads?

After reading several sources I'm still confused about user- and kernel-level threads. In particular: Threads can exist at both the user level and the kernel level What is the difference ...
11
votes
1answer
967 views

Are all system calls blocking?

I was reading an article that describes the switch between user-space and kernel-space that happens upon a system call. The article says An application expects the completion of the system call ...