On Tue, 2022-05-10 at 17:37 -0700, Josh Poimboeuf wrote: > On Wed, May 11, 2022 at 12:35:11AM +0000, Rik van Riel wrote: > > On Tue, 2022-05-10 at 23:57 +0000, Song Liu wrote: > > > > > > So, if we come back to the same question: is this a bug (or a > > > suboptimal > > > behavior that worth fixing)? If so, we are open to any solution > > > that > > > would also help PREEMPT and/or non-x86 arches. > > > > > Using the preempt notifiers during KLP transition should > > work equally well for PREEMPT and !PREEMPT. It also does > > not insert any additional code into the scheduler while > > there is no KLP transition going on. > > As I've been saying, this is not going to work for PREEMPT because, > without ORC, we can't reliably unwind from an IRQ handler, so the > kthread won't get patched. > Isn't the sched_out preempt notifier always run in process context? What am I missing?
