Re: [GIT PULL] First batch of KVM changes for 4.1

[Peter Zijlstra]

On Fri, Apr 17, 2015 at 03:38:58PM +0200, Paolo Bonzini wrote:
> > The path this notifier is called from has nothing to do with those
> > costs.
> 
> How not?  The task is going to incur those costs, it's not like half
> a dozen extra instruction make any difference.  But anyway...

Its attributed to the entity doing the migration, which can be the
wakeup path or a softirq. And we very much do care about the wakeup
path.

> ... that's a valid objection.  Please look at the patch below.

Still a NAK on that, distros have no choice but to enable that CONFIG
option because people might want to run KVM.

CONFIG options are pointless if they end up being mandatory.
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