On 05/04/2017 07:01 AM, Michal Hocko wrote: > Just to make my proposal more clear. I suggest the following workflow > > cache = kmem_cache_create(foo, object_size, ..., SLAB_SEAL); > > obj = kmem_cache_alloc(cache, gfp_mask); > init_obj(obj) > [more allocations] > kmem_cache_seal(cache); > > All slab pages belonging to the cache would get write protection. All > new allocations from this cache would go to new slab pages. Later > kmem_cache_seal will write protect only those new pages.
Igor, what sizes of objects are you after here, mostly? I ask because slub, at least, doesn't work at all for objects >PAGE_SIZE. It just punts those to the page allocator. But, you _could_ still use vmalloc() for those.
