On Tue 17-10-17 10:50:02, Guy Shattah wrote: [...] > > Well, we can provide a generic library functions for your driver to use so > > that > > you do not have to care about implementation details but I do not think > > exposing this API to the userspace in a generic fashion is a good idea. > > Especially when the only usecase that has been thought through so far seems > > to be a very special HW optimiztion. > > Are you going to be OK with kernel API which implements contiguous > memory allocation?
We already do have alloc_contig_range. It is a dumb allocator so it is not very suitable for short term allocations. > Possibly with mmap style? Many drivers could utilize it instead of > having their own weird and possibly non-standard way to allocate > contiguous memory. Such API won't be available for user space. Yes, an mmap helper which performs and enforces some accounting would be a good start. > We can begin with implementing kernel API and postpone the userspace > api discussion for a future date. if it is sufficient. We might not > have to discuss it at all. Yeah, that was my thinking as well. -- Michal Hocko SUSE Labs
