linux-kernel - Re: [PATCH 2/2] CFS CGroup: Report usage

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Message-ID: <6599ad830710230021n536908c0xd95250f36aa8a27d@mail.gmail.com>
Date:	Tue, 23 Oct 2007 00:21:59 -0700
From:	"Paul Menage" <menage@...gle.com>
To:	vatsa@...ux.vnet.ibm.com
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Ingo Molnar" <mingo@...e.hu>,
	"Srivatsa Vaddagiri" <vatsa@...ibm.com>,
	containers@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] CFS CGroup: Report usage

On 10/22/07, Paul Menage <menage@...gle.com> wrote:
>
> Using cgroup_mutex is certainly possible for now, although more
> heavy-weight than I'd like long term. Using css_get isn't the right
> approach, I think - we shouldn't be able to cause an rmdir to fail due
> to a concurrent read.
>

OK, the obvious solution is to use the same approach for subsystem
state objects as we do for the struct cgroup itself - move the calls
to the subsystem destroy methods to cgroup_diput. A control file
dentry will keep alive the parent dir's dentry, which will keep alive
the cgroup and (with this change) the subsystem state objects too.

The only potential drawback that I can see is that an open fd on a
cgroup directory or a control file will keep more memory alive than it
would have done previously.

Paul
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