linux-kernel - Re: [RFD] cgroup: about multiple hierarchies

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:	Wed, 22 Feb 2012 10:01:12 -0800
From:	Tejun Heo <tj@...nel.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Li Zefan <lizf@...fujitsu.com>,
	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kay Sievers <kay.sievers@...y.org>,
	Lennart Poettering <lennart@...ttering.net>,
	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org, Christoph Hellwig <hch@....de>
Subject: Re: [RFD] cgroup: about multiple hierarchies

Hey, Peter.

On Wed, Feb 22, 2012 at 02:30:59PM +0100, Peter Zijlstra wrote:
> FWIW I'm all for ripping the orthogonal hierarchy crap out, I hate it
> just about as much as you do judging from your write-up.

I just don't get why it's there.  Maybe, there can be some remote use
cases where orthogonal hierarchies can be useful but structuring whole
cgroup around that seems really extreme.

> I'm not sure on your process hierarchy pie though, I rather like being
> able to assign tasks to cgroups of my making without having to mirror
> that in the process hierarchy.

The only question is whether we want to allow cgroup hierarchy to be
completely orthogonal from process tree structure, which I don't think
is a good idea.  It shouldn't affect trivial use cases.  If not
explicitly configured, all tasks would live in a single root cgroup -
much like every process would belong to the same session if nobody
does setsid() since boot (or container).

I don't know how the implementation would turn out and it may as well
stay separate as it is now but I still think the topology should match
pstree.

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/