Date: Mon, 29 Dec 2008 14:23:05 +0100
From: Oleg Nesterov <oleg@redhat.com>
To: Scott James Remnant <scott@canonical.com>
Cc: Roland McGrath <roland@redhat.com>, lkml <linux-kernel@vger.kernel.org>,
       Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [RFC][PATCH] Notify init when processes are reparented to it
Message-ID: <20081229132305.GA31210@redhat.com>
References: <1230378128.7026.50.camel@quest> <20081227114452.GA2919@zelda.netsplit.com> <20081228092024.GA21673@redhat.com> <20081228220122.62940FC278@magilla.sf.frob.com> <1230551457.4664.0.camel@wing-commander>
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On 12/29, Scott James Remnant wrote:
>
> On Sun, 2008-12-28 at 14:01 -0800, Roland McGrath wrote:
>
> > I'm highly skeptical that this is a desireable feature at all, and
> > certainly I find the abuse of siginfo_t.si_status here extremely
> > questionable.  I think we need a clear explanation of what problems
> > the feature is intended to address.
> >
> Did the original e-mail not address this?

Do you mean

	[RFC] Notify init when processes are reparented to it
	http://marc.info/?l=linux-kernel&m=123038049428388

?

I am not sure I really understand the problem. And thus I can't
understand how this patch can help.

OK,

> We want to be able to supervise daemons.

What do you mean?

> Later on, 1002 will die and init will receive SIGCHLD for it.
>
> Unfortunately neither the 1001 or 1002 processes are known to init, even
> though they are original children of the process it spawned (1000), for
> init to be notified about them - this has been forgotten.

Ok, with this patch /sbin/init knows that 1002 is a descendant
of apache(1000) which was spwaned by init. What can init do
with this info?

To clarify, I am not arguing, I am just trying to understand.

Oleg.

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