[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] xen/arm: Don't save/restore context for idle VCPU
On Mon, 2014-07-07 at 16:29 +0100, Julien Grall wrote: > When an idle VCPU is running, Xen will never exit the hypervisor mode. > Futhermore, some part of the VCPU/domain initialization is already skipped for > them to avoid memory consumption. > > Actually each save/restore functions are checking themself if the vcpu is > an idle one or not. We can safely skipped the context switch in one place > and gain a bit of time when we {,un}schedule idle VCPU. This is because > the saving part will take care of disabling anything related to guest (such > as GICv). > > Also replace every check of and idle VCPU in save/restore functions by an > ASSERT, to know if someone is calling them with an idle VCPU in argument. > > Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx> Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx> _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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