Arquitectura del Kernel de Linux: Módulos, Memoria, Concurrencia, DRM y KMS

In this episode, we delve into the internal architecture of the Linux kernel, analyzing how the operating system kernel manages hardware, memory, concurrent processes, interrupts, and graphics devices. We'll begin by explaining why Linux is considered a modular monolithic kernel and how its capabilities can be extended using dynamic kernel modules (DGMs), files with the .ko extension that can be loaded and unloaded without restarting the system. We'll see how the Kbuild compilation system works, the basic structure of a module, initialization and cleanup functions, and tools such as: make insmod modprobe rmmod lsmod modinfo depmod dmesg We'll also study low-level memory management, differentiating between physical and virtual memory, and explaining the role of the MMU, page tables, memory pages, and address spaces. We will analyze the main memory allocation functions within the kernel: kmalloc kzalloc kcalloc vmalloc kvmalloc alloc_pages get_free_pages We will explain when each mechanism should be used, the differences between physically contiguous and virtually contiguous memory, and why the execution context is crucial when allocating memory. Another main section is dedicated to synchronization and concurrency. We will study the problems that arise when multiple processors, processes, or interrupts access the same data simultaneously. Concepts such as the following are explained: Race conditions Critical sections Mutual exclusion Preemption Atomic contexts Atomic operations Memory barriers Reference counting RCU We will compare spinlocks and mutexes in detail, explaining why a mutex can sleep while a spinlock keeps the processor actively waiting. We will also cover the operation of hardware interrupts or IRQs, shared interrupts, MSI, MSI-X, threaded interrupts, softIRQs, tasklets, and workqueues. Finally, we will analyze the native Linux graphics subsystem: DRM: Direct Rendering Manager. KMS: Kernel Mode Setting. We will see how Linux manages graphics cards, memory buffers, screen resolutions, connectors, encoders, CRTCs, planes, framebuffers, and synchronized image changes. We will also explain related technologies such as: GEM. TTM. DMA-BUF. Fences. Atomic Modesetting. Page Flip. VBlank. PRIME. This episode is for students, system administrators, driver developers, low-level programmers, and users interested in understanding how Linux connects software to hardware. Understanding the kernel isn't just about memorizing functions. It means understanding execution contexts, security boundaries, concurrency, and the responsibilities associated with developing privileged code. Subscribe for more content about Linux, operating systems, programming, computer security, free software, and computer architecture. Follow me live for more programming and live technical support!   / tomasgonzalezdev   🔧 Did this video help you? If you were able to solve your problem, leave a 👍 like! Don't forget to subscribe and turn on notifications 🔔 so you don't miss any tech solutions. 🗣️ Questions or technical inquiries? Leave them in the comments and I'll do my best to help you in the next video. 🤝 Let's connect professionally! For projects, IT consulting, or to see my career path, let's connect on LinkedIn: 👇 🔗   / tomas-gonzalez-soporte-it   #ITSupport #TechTips #TechnicalSolutions #TomasGonzalezIT #Linux #LinuxKernel #Programming #OperatingSystems #FreeSoftware #DRM #KMS #VirtualMemory #LinuxKernel