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The cachestat() Syscall: Reading Linux Page-Cache Stats from User Space
The cachestat syscall, added in Linux 6.5, reports page-cache residency for a file from user space. Call it with a worked C…
RB Aug 4 · 9 min
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How to Build an Embedded Linux Lab From Scratch
How to build an embedded Linux lab: from QEMU to a first board, serial console, and logic analyzer, and the skill each…
RB Jul 31 · 10 min
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Dynamic Debug in Linux: Turn On pr_debug Messages at Runtime
Use dynamic debug to switch on pr_debug and dev_dbg messages in a running Linux kernel, without rebuilding or rebooting.
RB Jul 21 · 12 min
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Reading a Kernel Oops, Part 2: Decode to the Source Line and Reason Backward
Decode a kernel oops down to the exact source line: a reproducible tutorial using dmesg, faddr2line, decode_stacktrace.sh and gdb on a test…
RB Jul 10 · 9 min
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Reading a Kernel Oops: What the Dump Is Telling You
Read a kernel oops like evidence, not an answer: decode the header, the faulting-address fingerprint, and the unreliable call-trace frames by eye.
RB Jul 7 · 15 min
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Real-Time Linux with PREEMPT_RT — Part 3: SCHED_FIFO Priorities and CPU Isolation
Set SCHED_FIFO priorities with chrt and configure CPU isolation with isolcpus and nohz_full so a real-time task runs with minimal interference.
RB Jul 5 · 12 min
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Control GPIO with libgpiod: Tools and the API
Control GPIO with libgpiod using the version 2 tools and C API. Hands-on examples with gpioget, gpioset, gpiomon, and a virtual gpio-mockup…
RB Jun 30 · 12 min
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Real-Time Linux with PREEMPT_RT — Part 2: Building a PREEMPT_RT Kernel and Comparing Latency
Build a PREEMPT_RT kernel from mainline 6.12 source, boot it, and re-run cyclictest to compare real-time latency against a standard kernel baseline.
RB Jun 28 · 9 min
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Function Tracing with ftrace: A Hands-On Kernel Tutorial
A hands-on guide to function tracing with ftrace: mount tracefs, run the function and function_graph tracers, filter functions, and read timed call…
RB Jun 23 · 18 min
TutorialsTutorials
Real-Time Linux with PREEMPT_RT — Part 1: Understanding Latency and Measuring It with cyclictest
Learn to measure PREEMPT_RT latency on Linux with cyclictest: what real-time means, how to run the test correctly, and how to read…
RB Jun 21 · 9 min
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