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Linux Workqueues: A Deep Dive into the Kernel’s Deferred Work Engine
A deep dive into Linux workqueues: how the kernel queues, wakes, and runs deferred work — from queue_work() to your handler, traced…
RB Jul 4 · 11 min
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Real-Time Linux vs RTOS: Zephyr, FreeRTOS, PREEMPT_RT
Real-time Linux vs RTOS, compared: FreeRTOS, Zephyr, and mainline PREEMPT_RT, and how mixed-criticality designs run Linux and an RTOS on one SoC.
RB Jul 1 · 15 min
Deep DivesDeep Dives
Coherent vs Streaming DMA: A Deep Dive into the Linux DMA Mapping API
A practical Deep Dive into the Linux DMA mapping API: coherent vs streaming mappings, DMA directions, cache coherency, and the rules that…
RB Jun 27 · 21 min
Deep DivesDeep Dives
Deferred Probe in the Linux Kernel: Why a Driver’s probe() Runs Late and How to Debug It
Deferred probe lets Linux drivers bind in any order by retrying devices whose dependencies are not ready. How the mechanism works in…
RB Jun 22 · 16 min
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Meet the sched_ext Ecosystem
This article provides a deep dive into the major scheduler classes, their unique design goals, and the management utilities powering the system.
RB Sep 17 · 4 min
Deep DivesDeep Dives
The sched_ext Architecture
sched_ext is not a scheduler; it's a framework that securely connects custom BPF programs to the core kernel. Its architecture consists of…
RB Sep 16 · 7 min
Deep DivesDeep Dives
The sched_ext Revolution: The Future of CPU Scheduling in Linux
For decades, general-purpose schedulers like CFS and EEVDF, powered everything from phones to supercomputers. But with complex hardware and specialized software, the…
RB Sep 16 · 4 min
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The Many Paths to init, Part 5: Unifying Themes
In this final installment of our series, we synthesize our exploration of diverse Linux boot processes by examining two critical, cross-platform themes:…
RB Sep 15 · 5 min
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The Many Paths to init, Part 4: The Specialists
Beyond PCs and general-purpose embedded systems lie platforms where the Linux boot process has been specialized to an extreme degree. In this…
RB Sep 13 · 4 min
Deep DivesDeep Dives
The Many Paths to init, Part 3: The Embedded Frontier
While the PC and server world has evolved towards the simplicity of Unified Kernel Images, the embedded systems domain—dominated by ARM and…
RB Sep 12 · 4 min
Deep DivesDeep Dives
The Many Paths to init, Part 2: The PC and Server Revolution
In the first part of our series, we established a four-stage framework for understanding any boot process. Now, we apply that model…
RB Sep 12 · 4 min
Deep DivesDeep Dives
The Many Paths to init, Part 1: The Universal Blueprint
At its core, booting is a procedure that takes a system from inert hardware to a fully operational state. This happens across…
RB Sep 11 · 4 min
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