On Mon, Nov 07, 2016 at 10:01:11AM +0100, Martin Polednik wrote:
The policy SCHED_DEADLINE is available since kernel 3.14 (and most likely backported to older RT_PREEMPT kernels). It is safer to use than fifo or round robin policies due to only limiting part of cpu time for the RT process, leading to lack of lockups of the host. The series adds new vcpusched/iothreadsched called 'deadline' that activates SCHED_DEADLINE for given process. As the scheduler is linux specific, extra implementation was required - it is not possible to use sched_setscheduler, sched_setattr syscall must be used. Martin Polednik (6): conf: add entries for deadline scheduler util: allow virProcessSetScheduler to set SCHED_DEADLINE virDomainFormatSchedDef: factor out subset code
conf: add deadline scheduler schema: add deadline scheduler docs: mention deadline scheduler in vcpusched
These three should be merged together. Also you should error out with unsupported values (e.g. deadline < runtime) in virDomainDefPostParse() so that users know it right away. That way we can change it later, but not when everything is acceptable now. Otherwise looks fine from a quick look. Have a nice day, Martin
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