linux-kernel - Re: + prctl-add-pr_setget_child_reaper-to-allow-simple-process-supervision .patch added to -mm tree

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Message-ID: <20110818142508.GA30959@redhat.com>
Date:	Thu, 18 Aug 2011 16:25:08 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Lennart Poettering <mzxreary@...inter.de>
Cc:	Kay Sievers <kay.sievers@...y.org>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-man@...r.kernel.org,
	roland@...k.frob.com, torvalds@...ux-foundation.org
Subject: Re: +
	prctl-add-pr_setget_child_reaper-to-allow-simple-process-supervision
	.patch added to -mm tree

On 08/18, Lennart Poettering wrote:
>
> On Wed, 17.08.11 15:45, Oleg Nesterov (oleg@...hat.com) wrote:
>
> > You should mark the whole process as sub-reaper, not a single thread
> > which does prctl(). The parent/child relationship is process-wide.
>
> Hmm, how would we implement this best? Would it be sufficient to follow
> group_leader pointer to set/get the flag,

You can mark task->group_leader. Or, probably better, task->signal.

INHO, the best option is SIGNAL_SUB_REAPER in signal->flags. But this
is not possible until we cleanup the usage of signal->flags.

> and to follow real_parent

OOPS. I simly can't understand how I managed to miss this. Of course,
in any case you should follow ->real_parent, not ->parent!

Oleg.

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