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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH 1/2] core-parking: interact with runtime SMT-disabling
>>> On 11.04.19 at 21:06, <andrew.cooper3@xxxxxxxxxx> wrote: > On 11/04/2019 13:45, Jan Beulich wrote: >> When disabling SMT at runtime, secondary threads should no longer be >> candidates for bringing back up in response to _PUD ACPI events. Purge >> them from the tracking array. >> >> Doing so involves adding locking to guard accounting data in the core >> parking code. While adding the declaration for the lock take the liberty >> to drop two unnecessary forward function declarations. >> >> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx> > > I can certainly appreciate these arguments, but surely the converse is > true. When SMT-enable is used, the newly-onlined threads are now > eligible to be parked. And nothing will keep them from getting parked. > At the moment, this looks asymetric. It does, but that's a result of core_parking.c only recording CPUs it has parked, not ones it could park. Jan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/xen-devel
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