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    SubjectRe: [PATCH v2] core, x86: Add user return notifiers
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    On Tue, 2009-09-22 at 16:32 +0200, 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?

    And here I was thinking this was one of the hottest code paths in the
    whole kernel...



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