On Wed 07-10-20 14:21:44, Peter Zijlstra wrote: > On Wed, Oct 07, 2020 at 02:04:01PM +0200, Michal Hocko wrote: > > I wanted to make sure that the idea is sound for maintainers first. The > > next step would be extending the command line to support full preemption > > as well but there is much more work in that area. Frederic has promissed > > to look into that. > > The sanest way there is to static_call() __preempt_schedule() I think.
Yes, I have checked the code and identified few other places like irqentry_exit_cond_resched. We also need unconditional CONFIG_PREEMPT_COUNT IIUC and there are quite some places guarded by CONFIG_PREEMPTION that would need to be examined. Some of them are likely pretending to be more clever than they really are/should be - e.g. mm/slub.c. So there is likely a lot of leg work. -- Michal Hocko SUSE Labs