linux-kernel - Re: [PATCH V5] blk-mq: don't schedule block kworker on isolated CPUs

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] [day] [month] [year] [list]

Date: Wed, 27 Mar 2024 10:29:14 -0600
From: Jens Axboe <axboe@...nel.dk>
To: linux-block@...r.kernel.org, Ming Lei <ming.lei@...hat.com>
Cc: linux-kernel@...r.kernel.org, Tim Chen <tim.c.chen@...ux.intel.com>, 
 Juri Lelli <juri.lelli@...hat.com>, Andrew Theurer <atheurer@...hat.com>, 
 Joe Mario <jmario@...hat.com>, Sebastian Jug <sejug@...hat.com>, 
 Frederic Weisbecker <frederic@...nel.org>, 
 Bart Van Assche <bvanassche@....org>, Tejun Heo <tj@...nel.org>
Subject: Re: [PATCH V5] blk-mq: don't schedule block kworker on isolated
 CPUs


On Fri, 22 Mar 2024 10:12:44 +0800, Ming Lei wrote:
> Kernel parameter of `isolcpus=` or 'nohz_full=' are used to isolate CPUs
> for specific task, and it isn't expected to let block IO disturb these CPUs.
> blk-mq kworker shouldn't be scheduled on isolated CPUs. Also if isolated
> CPUs is run for blk-mq kworker, long block IO latency can be caused.
> 
> Kernel workqueue only respects CPU isolation for WQ_UNBOUND, for bound
> WQ, the responsibility is on user because CPU is specified as WQ API
> parameter, such as mod_delayed_work_on(cpu), queue_delayed_work_on(cpu)
> and queue_work_on(cpu).
> 
> [...]

Applied, thanks!

[1/1] blk-mq: don't schedule block kworker on isolated CPUs
      commit: 5f27f3d892743312fce237958a4194859ef93d69

Best regards,
-- 
Jens Axboe