linux-kernel - Re: [RFC/PATCH 2/8]: CGroup Files: Add a cgroup write

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Date:	Tue, 13 May 2008 13:44:11 -0700
From:	Matt Helsley <matthltc@...ibm.com>
To:	menage@...gle.com
Cc:	pj@....com, xemul@...nvz.org, balbir@...ibm.com, serue@...ibm.com,
	akpm@...ux-foundation.org, containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC/PATCH 2/8]: CGroup Files: Add a cgroup write_string
	control file method


On Mon, 2008-05-12 at 23:37 -0700, menage@...gle.com wrote:
> plain text document attachment (cgroup_write_string.patch)
> This patch adds a write_string() method for cgroups control files. The
> semantics are that a buffer is copied from userspace to kernelspace
> and the handler function invoked on that buffer.  Any control group
> locking is done after the copy from userspace has occurred. The buffer
> is guaranteed to be nul-terminated, and no longer than max_write_len
> (defaulting to 64 bytes if unspecified). Later patches will convert
> existing raw file write handlers in control group subsystems to use
> this method.
> 
> Signed-off-by: Paul Menage <menage@...gle.com>

I haven't looked at this very thoroughly but I think the goal of this
patch is good. Can't this patch and the conversions precede your locking
changes?

Cheers,
	-Matt Helsley

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