Re: [v7 0/8] Reduce cross CPU IPI interference

From: Avi Kivity
Date: Thu Feb 02 2012 - 12:25:03 EST

On 02/02/2012 07:01 PM, Paul E. McKenney wrote:
> >
> > It's not called (since the cpu is not idle). Instead we call
> > rcu_virt_note_context_switch().
> Frederic's work checks to see if there is only one runnable user task
> on a given CPU. If there is only one, then the scheduling-clock interrupt
> is turned off for that CPU, and RCU is told to ignore it while it is
> executing in user space. Not sure whether this covers KVM guests.

Conceptually it's the same. Maybe it needs adjustments, since kvm
enters a guest in a different way than the kernel exits to userspace.

> In any case, this is not yet in mainline.

Let me know when it's in, and I'll have a look.

error compiling committee.c: too many arguments to function

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