On Mon, Jan 11, 2021 at 05:35:00PM +0000, Matthew Wilcox wrote: > On Mon, Jan 11, 2021 at 06:05:13PM +0100, Christoph Hellwig wrote: > > None of the complicated overlapping regions bits of the kobj_map are > > required for the character device lookup, so just a trivial xarray > > instead. > > Thanks for doing this. We could make it more efficient for chardevs > that occupy 64 or more consecutive/aligned devices -- is it worth doing? efficient in what way? Space or faster lookup? THis shouldn't be on a "fast" lookup path, so I doubt that's worth optimizing for. Space, maybe, for systems with thousands of scsi devices, but usually they just stick to the block device, not a char device from what I remember. thanks, greg k-h
