Operating systems, infrastructure, emulation, and technical history.
How the kernel community's often-combative culture led to a September 2018 policy change, and Torvalds' own public acknowledgment his conduct needed to change.
Announced by Torvalds in September 2024 and landing in kernel 6.12, PREEMPT_RT ended two decades as an out-of-tree patchset needing a custom kernel build.
Canonical's September 2021 decision to extend Ubuntu 14.04 and 16.04 LTS support to a full decade, and what it signaled about its long-term LTS commitment.
Distinguish global, cgroup, cpuset and policy-driven OOM events; interpret victim scoring and build memory controls from forensic evidence.
Understand Linux page-cache reads, buffered writes, dirty throttling and durability boundaries without confusing write completion with stable storage.
Trace Linux hardware from kernel device registration through sysfs, uevents, devtmpfs and udev rules to stable, collision-tested user-facing links.
Why you can't find most of macOS's own system libraries as individual files on disk anymore, and how the shared cache changed launch performance.
A Bluetooth device won't connect, keeps dropping, or macOS doesn't see it — a systematic path through the common causes before a full reset.
A Mac stuck on the Apple logo, or restarting in a loop, has a specific ordered set of causes — work through them from least to most invasive.
Working through blurry text and wrong resolution options after a macOS update, including the display-specific preference files that need resetting.