Messages in this thread | | | Date | Tue, 22 Sep 2009 17:45:05 +0300 | From | Avi Kivity <> | Subject | Re: [PATCH v2] core, x86: Add user return notifiers |
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On 09/22/2009 05:32 PM, Ingo Molnar wrote: > * 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? >> > Would be nice to convert some existing open-coded return-to-user-space > logic to this facility. One such candidate would be lockdep_sys_exit? >
I only implemented this for x86, while lockdep is arch independent. If arch support is added, it should be trivial.
I think perf counters could use preempt notifiers though, these are arch independent.
-- error compiling committee.c: too many arguments to function
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