linux-kernel - Re: [ckrm-tech] [PATCH 1/7] containers (V7): Generic container system abstracted from cpusets code

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:	Thu, 8 Mar 2007 16:08:08 +0530
From:	Srivatsa Vaddagiri <vatsa@...ibm.com>
To:	"Paul Menage" <menage@...gle.com>
Cc:	sekharan@...ibm.com, ckrm-tech@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, xemul@...ru, dev@...ru,
	containers@...ts.osdl.org, pj@....com, ebiederm@...ssion.com,
	mbligh@...gle.com, winget@...gle.com, rohitseth@...gle.com,
	serue@...ibm.com, devel@...nvz.org
Subject: Re: [ckrm-tech] [PATCH 1/7] containers (V7): Generic container system abstracted from cpusets code

On Wed, Mar 07, 2007 at 12:50:03PM -0800, Paul Menage wrote:
> The callback mutex (which is what container_lock() actually locks) is
> also used to synchronize fork/exit against subsystem additions, in the
> event that some subsystem has registered fork or exit callbacks. We
> could probably have a separate subsystem_mutex for that instead.

Why can't manage_mutex itself be used there (to serialize fork/exit callbacks
against modification to hierarchy)?

> Apart from that, yes, it may well be possible to move callback lock
> entirely inside cpusets.

Yes, that way only the hierarchy hosting cpusets takes the hit of
double-locking. cpuset_subsys->create/destroy can take this additional lock 
inside cpuset.c.

-- 
Regards,
vatsa
-
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/