Messages in this thread | | | Date | Tue, 22 Sep 2009 12:48:49 +0300 | From | Avi Kivity <> | Subject | Re: [PATCH v2] core, x86: Add user return notifiers |
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On 09/22/2009 12:37 PM, Arjan van de Ven wrote: > 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 ? >
No, why? It triggers a call to do_notify_resume() and a walks a list of length 1.
-- error compiling committee.c: too many arguments to function
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