With I/O devices getting faster each year, memory copies are becoming more and more expensive, wasting a lot of CPU cycles and being a burden to the memory subsystem. The problem goes even deeper, as device-to-device transfers usually require intermediate steps,...
It is an exciting time for Linux on RISC-V, the open instruction set (ISA) that is quickly gaining critical mass. I will introduce the pieces needed to boot Linux on RISC-V including the Privileged Architecture, OpenSBI and U-Boot, and how that fits into the upcoming...
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...
