linux-kernel - Re: [RFD] Merge task counter into memcg

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, 11 Apr 2012 16:21:42 -0300
From:	Glauber Costa <glommer@...allels.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
CC:	Hugh Dickins <hughd@...gle.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Tejun Heo <tj@...nel.org>, Daniel Walsh <dwalsh@...hat.com>,
	"Daniel P. Berrange" <berrange@...hat.com>,
	Li Zefan <lizf@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Cgroups <cgroups@...r.kernel.org>,
	Containers <containers@...ts.linux-foundation.org>
Subject: Re: [RFD] Merge task counter into memcg

On 04/11/2012 03:57 PM, Frederic Weisbecker wrote:
> So if we choose the second solution, this overhead will be added unconditionally
> to memcg.
> But I don't expect every users of memcg will need the task counter. So perhaps
> the overhead should be kept in its own separate subsystem.

What we're usually doing with kmem paths, like the upcoming slab 
tracking, is do not account if it is not limited. So if you are not
limited in a particular cgroup, you jut don't bother with accounting.

If this suits your need, you can probably do the same, and then
pay the price just for the users that are interested on it.

Now, whether or not this should be considered memory, is a different 
story. You can say it is memory yes, but I bet you can very well find a 
bunch of arguments to consider it "cpu" as well.

Against the memcg, consider this: Your counter would probably be the 
first non-page based data in memcg. At least raises a flag.
--
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/