linux-kernel - Re: [RFC][-mm] [0/2] Basic stats for cgroups V2

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Message-Id: <200804081919.14601.balajirrao@gmail.com>
Date:	Tue, 8 Apr 2008 19:19:14 +0530
From:	Balaji Rao <balajirrao@...il.com>
To:	"Paul Menage" <menage@...gle.com>
Cc:	linux-kernel@...r.kernel.org, containers@...ts.osdl.org,
	dhaval@...ux.vnet.ibm.com, balbir@...ibm.com,
	a.p.zijlstra@...llo.nl, "Ingo Molnar" <mingo@...e.hu>
Subject: Re: [RFC][-mm] [0/2] Basic stats for cgroups V2

On Tuesday 08 April 2008 01:06:17 pm Paul Menage wrote:
> 
> One of the important API choices would be whether the stats API was
> fixed in header files shared with userspace, or whether it would be
> possible for stats to be added and dynamically discovered/used by
> userspace without needing fixed header file descriptions.
> 
The second idea is much better, I feel.

> The difference would be a bit like the old sysctl API (where each
> sysctl entry had to be enumerated in a header file) versus the newer
> /proc/sys approach where numerical values aren't used and userspace
> can determine which entries are supported at runtime, and even access
> new previously-unknown entries.
> 

<snip>

> 
> Thoughts?

Overall the idea looks good to me.

We are also looking at a generic framework in cgroups that would delegate the 
job of handling statistics to the cgroup framework itself. This would avoid 
code duplication across various controllers.

-- 
regards,
Balaji Rao
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