Le 16/08/2022 à 08:06, Chaitanya Kulkarni a écrit :
On 8/15/22 13:52, Christophe JAILLET wrote:
Use percpu_ref_tryget_live_rcu() instead of percpu_ref_tryget_live() to
save a few cycles when it is known that the rcu lock is already
taken/released.
Signed-off-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
---
do you have a quantitative data that shows actual savings of cycles?
-ck
Some numbers were given for io_uring by the one who introduced
percpu_ref_tryget_live_rcu().
See [1].
I don't have specific numbers for the patch against scsi.
CJ
[1]:
https://lore.kernel.org/linux-kernel/cover.1634822969.git.asml.silence@xxxxxxxxx/
