Messages in this thread | | | Date | Tue, 22 Sep 2009 08:19:14 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH v2] core, x86: Add user return notifiers |
| |
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? > > Ingo
Sorry, limited bandwidth due to LinuxCon, but I like the concept, and the previous (partial) patch was really clean. I agree with Ingo that arch support so we can use this as a general facility would be nice, but I don't consider that as a prerequisite for merging.
-hpa
| |