On Thu 13-08-20 11:58:40, Uladzislau Rezki wrote: [...] > Sorry for jumping in. We can rely on preemptable() for sure, if CONFIG_PREEMPT_RT > is enabled, something like below: > > if (IS_ENABLED_RT && preemptebale()) Sure. I thought this was an RT specific thing that would be noop otherwise. > Also i have a question about pcp-lists. Can we introduce and use all allowed > MIGRATE_PCPTYPES? If called with GFP_RT_SAFE? If not please elaborate. Yes we can. This depends on the provided gfp_mask. Many gfp flags will be meaningless for such a context but essentially all we care about is that ((gfp_mask & __GFP_RECLAIM) == GFP_RT_SAFE) for the checking purpose. We can sort out all these details if this is decided to be the right way to do. My (pseudo) patch was mostly to show the direction I've had in mind for easier further discussion. -- Michal Hocko SUSE Labs
