Quoting [email protected] (2018-03-16 18:30:57) > From: Jeff McGee <[email protected]> > > Force preemption uses engine reset to enforce a limit on the time > that a request targeted for preemption can block. This feature is > a requirement in automotive systems where the GPU may be shared by > clients of critically high priority and clients of low priority that > may not have been curated to be preemption friendly. There may be > more general applications of this feature. I'm sharing as an RFC to > stimulate that discussion and also to get any technical feedback > that I can before submitting to the product kernel that needs this. > I have developed the patches for ease of rebase, given that this is > for the moment considered a non-upstreamable feature. It would be > possible to refactor hangcheck to fully incorporate force preemption > as another tier of patience (or impatience) with the running request.
So one big problem I should have realised earlier is ksoftirqd screws up any latency sensitive operation. I have an ugly idea for a hack, but we really should cap the latency problems with tasklets. -Chris _______________________________________________ Intel-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/intel-gfx
