linux-kernel - Re: Attempted summary of suspend-blockers LKML thread

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Message-ID: <AANLkTikqMg+Syf3YooE9PtWD-S2nRemVcOitivUFU3OG@mail.gmail.com>
Date:	Mon, 2 Aug 2010 21:38:12 -0700
From:	Paul Menage <menage@...gle.com>
To:	Florian Mickler <florian@...kler.org>
Cc:	david@...g.hm, Arjan van de Ven <arjan@...radead.org>,
	paulmck@...ux.vnet.ibm.com, "Ted Ts'o" <tytso@....edu>,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	arve@...roid.com, mjg59@...f.ucam.org, pavel@....cz, rjw@...k.pl,
	stern@...land.harvard.edu, swetland@...gle.com,
	peterz@...radead.org, tglx@...utronix.de, alan@...rguk.ukuu.org.uk
Subject: Re: Attempted summary of suspend-blockers LKML thread

On Sun, Aug 1, 2010 at 11:53 PM, Florian Mickler <florian@...kler.org> wrote:
>
> Thinking about it.. I don't know much about cgroups, but I think a
> process can only be in one cgroup at a time.

A thread can only be in one cgroup in each hierarchy at one time. You
can mount multiple cgroups hierarchies, with different resource
controllers on different hierarchies.

>
> b) you can't use cgroup for other purposes anymore. I.e. if you want to
> have 2 groups that each only have half of the memory available, how
> would you then integrate the cgroup-ignore-for-idle-approach with this?

You could mount the subsystem that provides the "ignore-for-idle"
support on one hierarchy, and partition the trusted/untrusted
processes that way, and the memory controller subsystem on a different
hierarchy, with whatever split you wanted for memory controls.

Paul
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