linux-kernel - Re: [RFC][PATCH 1/7] CGroup API: Add cgroup.api control file

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Message-Id: <20080219231726.4bd97520.pj@sgi.com>
Date:	Tue, 19 Feb 2008 23:17:26 -0600
From:	Paul Jackson <pj@....com>
To:	"Paul Menage" <menage@...gle.com>
Cc:	lizf@...fujitsu.com, balbir@...ux.vnet.ibm.com, balbir@...ibm.com,
	xemul@...nvz.org, kamezawa.hiroyu@...fujitsu.com,
	vatsa@...ux.vnet.ibm.com, akpm@...ux-foundation.org,
	containers@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH 1/7] CGroup API: Add cgroup.api control file

Paul M wrote:
> I guess it's not essential, I just figured that if we had that
> information, it made sense to make it available to userspace. I guess
> I'm happy with dropping the actual exposed cgroup.api file for now as
> long as we can work towards reducing the number of control files that
> just return strings, and make use of the structured output such as
> read_uint() miore.

I could certainly go along with that ... reducing the proportion of
control files returning untyped strings.

My sense of kernel-user API's is that usually the less said the better.
Identify the essential information that one side requires from the
other via a runtime API, and pass only that.  API's represent a
lifetime commitment, so the less promised the better.

Perhaps my primary concern with these *.api files was that I did not
understand who or what the critical use or user was; who found this
essential, not just nice to have.

-- 
                  I won't rest till it's the best ...
                  Programmer, Linux Scalability
                  Paul Jackson <pj@....com> 1.940.382.4214
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