On Mon 18-06-18 12:21:46, Dan Williams wrote: [...] > I do think we should explore a page flag for pages that are "long > term" pinned. Michal asked for something along these lines at LSF / MM > so that the core-mm can give up on pages that the kernel has lost > lifetime control. Michal, did I capture your ask correctly? I am sorry to be late. I didn't ask for a page flag exactly. I've asked for a way to query for the pin to be temporal or permanent. How that is achieved is another question. Maybe we have some more spare room after recent struct page reorganization but I dunno, to be honest. Maybe we can have an _count offset for these longterm pins. It is not like we are using the whole ref count space, right? Another thing I was asking for is to actually account those longterm pinned pages and apply some control over those. They are basically mlock like and so their usage should better not be unbound. -- Michal Hocko SUSE Labs -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
