On 4/17/25 5:08 AM, Yu Kuai wrote: > 在 2025/04/15 22:52, Jens Axboe 写道: >> Even if blk-rq-qos isn't used or configured, dipping into the queue to >> fetch ->rq_qos is a noticeable slowdown and visible in profiles. Add an >> unlikely static key around blk-rq-qos, to avoid fetching this cacheline >> if blk-iolatency or blk-wbt isn't configured or used. >> >> Signed-off-by: Jens Axboe <axboe@xxxxxxxxx> >> >> --- >> > LGTM > > Reviewed-by: Yu Kuai <yukuai3@xxxxxxxxxx> > > BTW, do we want the same thing for q->td? We may want to do that - I haven't seen that in the hot path yet, but I also think I may have it configured out... -- Jens Axboe
