linux-kernel - Re: [PATCH 10/10] workqueue: use generic pool-bind/unbind routine for rescuers

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]

Date:	Mon, 5 May 2014 10:54:00 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 10/10] workqueue: use generic pool-bind/unbind routine
 for rescuers

On Sun, Apr 27, 2014 at 12:09:05PM +0800, Lai Jiangshan wrote:
> There are several problems with the code that rescuers bind itself to the pool'
> cpumask
>   1) It uses a way different from the normal workers to bind to the cpumask
>      So we can't maintain the normal/rescuer workers under the same framework.
>   2) The the code of cpu-binding for rescuer is complicated
>   3) If one or more cpuhotplugs happen while the rescuer processes the
>      scheduled works, the rescuer may not be correctly bound to the cpumask of
>      the pool. This is allowed behavior, but is not good. It will be better
>      if the cpumask of the rescuer is always kept coordination with the pool
>      across any cpuhotplugs.
> 
> Using generic pool-bind/unbind routine will solve the above problems,
> and result much more simple code.

Ah, nice.  Yeah, I definitely like it.  We can solve
iteration-from-oops problem using RCU if it becomes necessary.  I
don't quite like the name of bind_entry tho.  I'll comment on it on
that patch.

Thanks.

-- 
tejun
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/