On 11/19/24 09:28, Bart Van Assche wrote: > Prepare for allocating a request from a specific hctx by making > blk_mq_submit_bio() allocate a request later. > > The performance impact of this patch on the hot path is small: if a > request is cached, one percpu_ref_get(&q->q_usage_counter) call and one > percpu_ref_put(&q->q_usage_counter) call are added to the hot path. > > Signed-off-by: Bart Van Assche <bvanassche@xxxxxxx> The patch looks OK, but I cannot weight on if this is really a "small" impact on performance. Jens may want to run his perf setup with this to verify. -- Damien Le Moal Western Digital Research
