Messages in this thread | | | Date | Fri, 17 Apr 2015 15:43:35 +0200 | From | Peter Zijlstra <> | Subject | Re: [GIT PULL] First batch of KVM changes for 4.1 |
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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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