On Fri, Feb 09, 2024 at 10:52:48PM +0100, Oscar Salvador wrote: > Thinking about it some more, I think I made a mistake: > > I am walking all buckets, and within those buckets there are not only > page_owner stack_records, which means that I could return a stack_record > from e.g: KASAN (which I think can evict stack_records) and then > everything goes off the rails. > Which means I cannot walk the buckets like that. > > Actually, I think that having something like the following > > struct list_stack_records { > struct stack_record *stack; > struct list_stack_records *next; > } Or, I could use the extra_bits field from handle_parts to flag that when a depot_stack_handle_t is used by page_owner. Then __stack_depot_get_next_stack_record() would check whether a stack_record->handle.extra_bits has the page_owner bit, and only return those stacks that have such bit. This would solve the problem of returning a potentially evictable stack , only by returning page_owner's stack_records, and I would not have to maintain my own list. I yet have to see how that would look like, but sounds promising. Do you think that is feasible Marco? Thanks -- Oscar Salvador SUSE Labs