Re: [PATCH v2] scsi: target: Save a few cycles in transport_lookup_[cmd|tmr]_lun()

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 




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/




[Index of Archives]     [Kernel Development]     [Kernel Announce]     [Kernel Newbies]     [Linux Networking Development]     [Share Photos]     [IDE]     [Security]     [Git]     [Netfilter]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Device Mapper]

  Powered by Linux