linux-kernel - Re: [PATCH v4 0/3] Send audit/procinfo/cgroup data in socket-level control message

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Message-Id: <20140115.121730.1984913330507219167.davem@davemloft.net>
Date:	Wed, 15 Jan 2014 12:17:30 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	jkaluza@...hat.com
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	eparis@...hat.com, rgb@...hat.com, tj@...nel.org,
	lizefan@...wei.com, containers@...ts.linux-foundation.org,
	cgroups@...r.kernel.org, viro@...iv.linux.org.uk
Subject: Re: [PATCH v4 0/3] Send audit/procinfo/cgroup data in socket-level
 control message

From: Jan Kaluza <jkaluza@...hat.com>
Date: Mon, 13 Jan 2014 09:01:46 +0100

> Changes introduced in this patchset can also increase performance
> of such server-like processes, because current way of opening and
> parsing /proc/$PID/* files is much more expensive than receiving these
> metadata using SCM.

The problem with this line of reasoning is that these changes will
hurt everyone else, because these new control messages are sent
unconditionally, whether the application is interested in them or not.

I really don't like this cost tradeoff, it's terrible, and therefore
I'm really not inclined to apply these patches, sorry.
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