On 6/25/25 5:00 PM, Damien Le Moal wrote:
On 6/17/25 07:33, 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.
Numbers ?
The change is forcing a queue enter for all BIOs because you remove the cached
request optimization. So I am not sure it is the impact is that small if you
have a very fast storage device.
Hi Damien,
I will check whether I can drop this patch by reworking the later
patches from this series.
Thanks,
Bart.
