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Operating System
161 posts
An operating system is the most important software that runs on a computer. It manages the computer’s memory and processes, as well as all of its software and hardware. It also allows you to communicate with the computer without knowing how to speak the computer’s language.
Explain the SLUB (SLAB Unreliable Allocator) memory allocator in the Linux kernel
SLUB is the default memory allocator in the Linux kernel today, sitting quietly underneath nearly every kmalloc() call…
What are memory allocators, and why are they crucial for kernel memory management
Every running program, from a tiny shell script to the kernel itself, needs memory that doesn’t exist until…
What is the purpose of the Translation Lookaside Buffer (TLB) in virtual memory
Every single memory access a running program makes — reading a variable, calling a function, fetching an instruction…
How does the operating system handle a page fault during address translation
Page faults sound like errors, and the name doesn’t help — but the overwhelming majority of page faults…
Describe the role of the page table entry (PTE) in a page table
If you zoom all the way into the machinery of virtual memory, past the TLB, past the multi-level…
Explain the concept of address translation in the context of virtual memory
Address translation is the quiet mechanism that makes almost everything else in modern computing possible — process isolation,…
Discuss the security considerations of memory mapping in operating systems
Memory mapping is one of those operating system features that quietly powers an enormous amount of everyday functionality…
Explain how file mapping contributes to efficient memory utilization
Reading a file the “traditional” way — open(), read() into a buffer, process it, maybe read() again —…
What is memory mapping, and how does it relate to main memory in operating systems
If you’ve ever wondered how a program that’s only a few megabytes in size manages to work with…
Explain the concept of big-endian and little-endian in the ARM architecture
Every time a computer stores a number bigger than a single byte in memory, it has to decide…