linux-kernel - Re: Notification when a task is created/exits

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Date:	Wed, 17 Feb 2010 11:53:13 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	"Leonidas ." <leonidas137@...il.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Notification when a task is created/exits

On Tue, 16 Feb 2010 11:18:25 +0530
"Leonidas ." <leonidas137@...il.com> wrote:

> Hi folks,
> 
> Is it possible to register a set of callbacks from my module so that
> these call backs get called
> whenever a certain task is created or exits. Basically, I want to keep
> track of all the threads
> which are created and are exiting, my module should get notified of
> these events somehow.
> One way is to call my functions directly from the task creation and
> exit functions, but I personally
> do not like this approach since I dont want to mess with this core kernel code.
> 

AFAIK, there are no extensible notifier chain at task create/exit.
But I think you have 2 options.

 1. use NETLINK and catch task create/exit in userland.
    But this means "catch" is asyncronous.

 2. implement cgroup subsystem
    AFAIK, in the latest kernel, cgroup subsystem can be implemented as module. 
    cgroup has fork/exit handler.
    And you can implement some useful controls for tasks you watch via
    cgroup's control interface.

Thanks,
-Kame


> -Leo.
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