Hello Andrii, could you please use plain text (not HTML) in your emails?
On Fri, 21 Apr 2017, Andrii Anisov wrote: > > Hello, > > On 20.04.17 23:20, Volodymyr Babchuk wrote: > > Hi Stefano, > > On 12 April 2017 at 22:17, Stefano Stabellini <sstabell...@kernel.org> wrote: > > On Wed, 12 Apr 2017, Dario Faggioli wrote: > > On Tue, 2017-04-11 at 13:32 -0700, Stefano Stabellini wrote: > > On Fri, 7 Apr 2017, Stefano Stabellini wrote: > > This is the most difficult problem that we need to solve as part of > this > work. It is difficult to have the right answer at the beginning, > before > seeing any code. If the app_container/app_thread approach causes > too > much duplication of work, the alternative would be to fix/improve > stubdoms (minios) until they match what we need. Specifically, > these > would be the requirements: > > IMO, this stubdom way, is really really really interesting! :-) > > 1) Determinism: a stubdom servicing a given guest needs to be > scheduled > immediately after the guest vcpu traps into Xen. It needs to > deterministic. > > We will also need another type of application: one which is periodically > called by XEN itself, not actually servicing any domain request. This is > needed for a > coprocessor sharing framework scheduler implementation. EL0 apps can be a powerful new tool for us to use, but they are not the solution to everything. This is where I would draw the line: if the workload needs to be scheduled periodically, then it is not a good fit for an EL0 app. In that case, stubdoms or regular driver domains are a better choice. EL0 apps are a natural fit for emulators, when you have one instance per VM. I am not completely convinced that they could be used for cases where you need one instance for all domains (even without periodic scheduling). I am not sure they could be made to work well that way. Stubdom or driver domains could be better fit for that use case too. _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org https://lists.xen.org/xen-devel