On 10/18/21 2:42 AM, Christoph Hellwig wrote: > On Sat, Oct 16, 2021 at 07:37:35PM -0600, Jens Axboe wrote: >> If we don't use an IO scheduler or have shared tags, then we don't need >> to call into this external function at all. This saves ~2% for such >> a setup. > > This looks correct, although the call chain gets a little confusing > now. How much difference is this over basically inlining the > whole old blk_mq_get_driver_tag? It just condenses the fast path into the checks upfront. I can run the numbers, but it'll be extra work. -- Jens Axboe
