WireGuard implementation for the OpenBSD kernel https://git.zx2c4.com/wireguard-openbsd/atom/regress/lib/libc/timekeep?h=master 2020-07-06T13:33:05Z 2020-07-06T13:33:05Z pirofti pirofti@openbsd.org 2020-07-06T13:33:05Z urn:sha1:d82e6535c6efd8305182f77041b2246ccfae1196 This diff exposes parts of clock_gettime(2) and gettimeofday(2) to userland via libc eliberating processes from the need for a context switch everytime they want to count the passage of time. If a timecounter clock can be exposed to userland than it needs to set its tc_user member to a non-zero value. Tested with one or multiple counters per architecture. The timing data is shared through a pointer found in the new ELF auxiliary vector AUX_openbsd_timekeep containing timehands information that is frequently updated by the kernel. Timing differences between the last kernel update and the current time are adjusted in userland by the tc_get_timecount() function inside the MD usertc.c file. This permits a much more responsive environment, quite visible in browsers, office programs and gaming (apparently one is are able to fly in Minecraft now). Tested by robert@, sthen@, naddy@, kmos@, phessler@, and many others! OK from at least kettenis@, cheloha@, naddy@, sthen@