Re: [PATCH v2] core, x86: Add user return notifiers

Arjan van de Ven
2009-09-22T09:37:13Z

On Tue, 22 Sep 2009 12:25:33 +0300
Avi Kivity <avi@redhat.com> wrote:

> On 09/19/2009 09:40 AM, Avi Kivity wrote:
> > Add a general per-cpu notifier that is called whenever the kernel is
> > about to return to userspace. The notifier uses a thread_info flag
> > and existing checks, so there is no impact on user return or context
> > switch fast paths.
> >
>
> Ingo/Peter?

isn't this like really expensive when used ?

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Arjan van de Ven Intel Open Source Technology Centre
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