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

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Date:	Fri, 19 Aug 2011 16:58:15 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Kay Sievers <kay.sievers@...y.org>
Cc:	Lennart Poettering <mzxreary@...inter.de>,
	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 08/19, Kay Sievers wrote:
>
> On Fri, 2011-08-19 at 15:13 +0200, Oleg Nesterov wrote:
> > On 08/19, Kay Sievers wrote:
>
> > But this has other (OK, minor) problems too, afaics. First of all, this
> > ->has_child_subreaper = T is not right when the caller exits. We should
> > not look for ->is_child_subreaper parent, our children should to find us.
> >
> > Right?
>
> The flags are still inherited. If the subreaper isn't there anymore, we
> will look it up and not find it. I think that's ok for the very unusual
> case that a service manager goes away and its children still run. We
> will just fall back to the usual PID 1 logic.

Yes, yes, I didn't mean this is really buggy. Just a bit "strange".
Anyway, this is fixed in v4 you sent.

> version 4:

Looks correct... But I don't trust myself. Especially after I missed
the problem with klthreads ;)

I'll try to re-read this patch carefully tomorrow with a fresh head.

Oleg.

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