[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [Patch 2 of 2]: PV-domain SMP performance Linux-part
Jan Beulich wrote: >>>> Juergen Gross <juergen.gross@xxxxxxxxxxxxxxxxxxx> 19.12.08 11:06 >>> >> Regarding handling this in Xen only: not to deschedule a vcpu in case of >> interrupts disabled is easy, but how would you deschedule it after interrupts >> are allowed again? > > It's all the same as with the newly added flag of yours - it requires > cooperation > from the guest (plus the forced de-schedule if it fails to do so). It's just > that > you don't need to set two flags when disabling interrupts, that second flag > would only be needed when you want to avoid being de-scheduled for > reasons other than event delivery being disabled. Just another thought: My approach was more compatible. Only a guest which is aware of the new flag will set it and in turn respect the request of the hypervisor to give up control after enabling de-scheduling again. Old guests would always be regarded as non-cooperative. Juergen -- Juergen Gross Principal Developer IP SW OS6 Telephone: +49 (0) 89 636 47950 Fujitsu Siemens Computers e-mail: juergen.gross@xxxxxxxxxxxxxxxxxxx Otto-Hahn-Ring 6 Internet: www.fujitsu-siemens.com D-81739 Muenchen Company details: www.fujitsu-siemens.com/imprint.html _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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