linux-kernel - Re: [PATCH] connector: add comm change event report to proc connector

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Message-Id: <20110826141334.bc2b5da6.akpm@linux-foundation.org>
Date:	Fri, 26 Aug 2011 14:13:34 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Vladimir Zapolskiy <vzapolskiy@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Evgeniy Polyakov <zbr@...emap.net>
Subject: Re: [PATCH] connector: add comm change event report to proc
 connector

On Tue,  2 Aug 2011 21:46:51 +0300
Vladimir Zapolskiy <vzapolskiy@...il.com> wrote:

> This change adds an event to monitor comm value changes of tasks. Such
> an event becomes vital, if someone desires to control threads of a
> process in different manner.
> 
> A natural characteristic of threads is its comm value, and helpfully
> application developers have an opportunity to change it in runtime.
> Reporting about such events via proc connector allows to fine-grain
> monitoring and control potentials, for instance a process control
> daemon listening to proc connector and following comm value policies
> can place specific threads to assigned cgroup partitions.
> 
> It might be possible to achieve a pale partial one-shot likeness
> without this update, if an application changes comm value of a thread
> generator task beforehand, then a new thread is cloned, and after
> that proc connector listener gets the fork event and reads new
> thread's comm value from procfs stat file, but this change visibly
> simplifies and extends the matter.

Monotoring and controlling tasks via their comm value seems weird,
inefficient and unreliable.  Who is doing this, and why?

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