linux-kernel - Re: [PATCH v2] scsi: target: Save a few cycles in transport_lookup_[cmd|tmr]

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <757f1326-bc70-aa93-b2d3-dfd91698406e@nvidia.com>
Date:   Tue, 16 Aug 2022 06:06:50 +0000
From:   Chaitanya Kulkarni <chaitanyak@...dia.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "michael.christie@...cle.com" <michael.christie@...cle.com>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "target-devel@...r.kernel.org" <target-devel@...r.kernel.org>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: Re: [PATCH v2] scsi: target: Save a few cycles in
 transport_lookup_[cmd|tmr]_lun()

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@...adoo.fr>
> ---

do you have a quantitative data that shows actual savings of cycles?

-ck