linux-kernel - Re: [PATCH] exit: PR_SET_ANCHOR for marking processes as reapers for child processes

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Message-ID: <20100309131935.GA11467@redhat.com>
Date:	Tue, 9 Mar 2010 14:19:35 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Ray Lee <ray-lk@...rabbit.org>
Cc:	Lennart Poettering <mzxreary@...inter.de>,
	Roland McGrath <roland@...hat.com>,
	Kay Sievers <kay.sievers@...y.org>,
	linux-kernel@...r.kernel.org,
	Americo Wang <xiyou.wangcong@...il.com>,
	James Morris <jmorris@...ei.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Kyle McMartin <kyle@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Michael Kerrisk <mtk.manpages@...glemail.com>
Subject: Re: [PATCH] exit: PR_SET_ANCHOR for marking processes as reapers
	for child processes

On 03/08, Ray Lee wrote:
>
> The kernel already offers system-wide process exit notification via
> taskstats (a netlink interface), though unfortunately I believe it's
> optional. It's pretty easy to use (as these things go, anyway -- I was
> able to hack up an arbitrary process exit watcher in about a half hour
> based on Documentation/accounting/getdelays.c).

Or proc connector (optional too). Unlike taskstats it notifies about
fork() as well. But, iirc it doesn't allow to filter out the unwanted pids.

Actually, I don't really understand how PR_SET_ANCHOR task can monitor
several daemons. I mean, when the grandchild dies, the sub-init doesn't
know who forked this child during daemonize().


Cough, can't resist... With utrace it would very simple to create the
module which allows to monitor the child's fork/exit/etc with almost
zero overhead, and this overhead only applies to the "traced" tasks.

Oleg.

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