Introspection information, used originally by debuggers, has come a long way into playing a greater role in the functioning of Linux. Now its used by tracers, profilers, and then by eBPF, in libbpf, in the verifier and other parts of the kernel, being always available...
The current userspace API for brightness control offered by /sys/class/backlight devices has various problems: 1. There is no way to map the backlight device to a specific display-output / panel 2. On x86 there can be multiple firmware + direct-hw-access methods for...
Kernel bugs that sneak past testing into production tend to be tricky, convoluted, and hard to reproduce. When investigating such bugs, you often want to explore various data structures, look for patterns, and check your assumptions. After falling victim to some...
