Messages in this thread | | | Date | Tue, 22 Sep 2009 20:05:42 +0300 | From | Avi Kivity <> | Subject | Re: [PATCH v2] core, x86: Add user return notifiers |
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On 09/22/2009 07:55 PM, Peter Zijlstra wrote: >> If you're using lockdep, surely that's not your biggest worry? >> > No, but that's all under #ifdef and fully disappears when not enabled. > Generic return-tu-user notifiers don't sound like they will though. >
They will if not selected. If selected and not armed, they will have zero runtime impact since they piggyback on existing branches (_TIF_DO_NOTIFY_MASK and near relatives). If selected and armed they'll cause __switch_to_xtra() on every context switch and do_notity_resume() on syscall exit until disarmed, but then you've asked for it.
-- error compiling committee.c: too many arguments to function
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