On Tue, Jan 23, 2024 at 09:59:50PM -0500, Joel Fernandes wrote: > We should discuss a new approach for increasing KVM virtual CPU (vCPU) priority > when guests need low latency. The last RFC posting [1] on this is thought to be > too rigid and baking too much policy into the kernel. Incorporating complex > policy logic directly into KVM seems problematic long-term for maintenance. Lets > discuss leveraging BPF programs to offload more scheduling policy decisions to > BPF / userspace. > > Specific issues to discuss: > > * Add support for enabling BPF programs to share memory and interface with guest. > > * Create a kernel function allowing BPF programs to call sched_setscheduler(), > facilitating priority boosting. > > * UAPI concerns. > > * Challenges with loading BPF programs in guest userspace we don't control. > > [1] https://lore.kernel.org/all/20231214024727.3503870-1-vineeth@xxxxxxxxxxxxxxx/ +1 to discussing all of the above at LSFMM, ideally as part of the BPF track.
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