Hans — Systems Field NotesField notes on GPU drivers, Linux kernel interfaces, firmware, and memory management.https://hansarnold.uk/Where RM Runs: Host RM, GSP-RM, and Firmware Boothttps://hansarnold.uk/notes/host-rm-gsp-rm-firmware-boot/https://hansarnold.uk/notes/host-rm-gsp-rm-firmware-boot/A boundary-oriented view of how NVIDIA moves physical resource management onto GSP, bootstraps the firmware, and reconnects it to host RM over RPC.Sun, 12 Jul 2026 00:00:00 GMTWhere DKMS Ends in the NVIDIA Linux Driverhttps://hansarnold.uk/notes/nvidia-dkms-and-kernel-modules/https://hansarnold.uk/notes/nvidia-dkms-and-kernel-modules/Following an NVIDIA driver build across RM, Kbuild, module ABI checks, GSP firmware, UVM, and DRM to see what DKMS does—and what it cannot do.Sun, 12 Jul 2026 00:00:00 GMTFrom GPU Fault to Replay: UVM, HMM, and Page Migrationhttps://hansarnold.uk/notes/uvm-hmm-replayable-faults-page-migration/https://hansarnold.uk/notes/uvm-hmm-replayable-faults-page-migration/Tracing a replayable GPU fault through UVM batching, residency policy, Linux HMM invalidation, migrate_vma, GPU page-table updates, and replay.Sun, 12 Jul 2026 00:00:00 GMTWhat We Talk About When We Talk About Refactoringhttps://hansarnold.uk/writing/what-we-talk-about-when-we-talk-about-refactoring/https://hansarnold.uk/writing/what-we-talk-about-when-we-talk-about-refactoring/Refactoring becomes avoidance when structural change substitutes for naming the real constraint, making the hard decision, or investigating behavior.Sat, 11 Jul 2026 00:00:00 GMT