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

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Message-ID: <AANLkTinGjktpuNi8062BQPegr4mofF6bx2EfBAsbOhCe@mail.gmail.com>
Date:	Mon, 2 Aug 2010 21:41:17 -0700
From:	Paul Menage <menage@...gle.com>
To:	david@...g.hm
Cc:	Florian Mickler <florian@...kler.org>,
	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 Mon, Aug 2, 2010 at 2:06 AM,  <david@...g.hm> wrote:
>
> yes, it could mean a doubleing in the number of cgroups that you need on a
> system. and if there are other features like this you can end up in a
> geometric explosion in the number of cgroups.

No, it would be additive - you can mount different subsystems on
separate hierarchies. So if you had X divisions for memory, Y
divisions for CPU and Z divisions for suspend-blocking (where Z=2,
probably?) you could mount three separate hierarchies and have X+Y+Z
complexity, not X*Y*Z.

(Not that I have a strong opinion on whether cgroups is an appropriate
mechanism for solving this problem - just that the problem you forsee
shouldn't occur in practice).

Paul
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