On Tue, Oct 27, 2015 at 04:57:05PM -0700, Paul Turner wrote: > +static void rseq_sched_out(struct preempt_notifier *pn, > + struct task_struct *next) > +{ > + set_thread_flag(TIF_NOTIFY_RESUME); > +} > > static __read_mostly struct preempt_ops rseq_preempt_ops = { > .sched_in = rseq_sched_in_nop, > - .sched_out = rseq_sched_out_nop, > + .sched_out = rseq_sched_out, > }; Since we're unconditionally setting this TIF flag for these tasks, can't we introduce something similar to the (contested) TIF_NOHZ_FULL thing which is kept on the task indefinitely. That avoids having the preempt notifiers and this atomic op in the schedule path. -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html