>>>>> If we do resource rebalance after system is up, do you think >>>>> there is any >>>>> side effect or impact to other subsystem other than PCI (e.g. >>>>> MTRR)? >>>> I don't think so. >>>>> I haven't had much thinking on the dynamical resource rebalance. >>>>> If you >>>>> have any idea about this, can you please suggest? >>>> Yeah, it's going to be hard :) >>>> We've thought about this in the past, and even Microsoft said it >>>> was >>>> going to happen for Vista, but they realized in the end, like we >>>> did a >>>> few years previously, that it would require full support of all PCI >>>> drivers as well (if you rebalance stuff that is already bound to a >>>> driver.) So they dropped it. >>>> When would you want to do this kind of rebalancing? Before any PCI >>>> driver is bound to any devices? Or afterwards? >>> >>> I guess if we want the rebalance dynamic, then we should have it >>> full -- >>> the rebalance would be functional even after the driver is loaded. >>> >>> But in most cases, there will be problem when we unload driver >>> from a hard >>> disk controller, etc. We can mount root on a ramdisk and do the >>> rebalance >>> there, but it's complicated for a real user. >>> >>> So looks like doing rebalancing before any driver is bound to any >>> device is >>> also a nice idea, if user can get a shell to do rebalance before >>> built-in >>> PCI driver grabs device. >> >> That's not going to work, it needs to happen before any PCI device is >> bound, which is before init runs. > > We could run shell from early initrd... And PCI is not required for > initrd, right? You can't be sure of that - compile your ATA driver =y and you'll definitely end up using PCI. Alex _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/virtualization
