linux-kernel - Re: [path][rfc] add PR

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Message-ID: <4D9F805B.206@aknet.ru>
Date:	Sat, 09 Apr 2011 01:38:35 +0400
From:	Stas Sergeev <stsp@...et.ru>
To:	Bryan Donlan <bdonlan@...il.com>
CC:	Linux kernel <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...hat.com>
Subject: Re: [path][rfc] add PR_DETACH prctl command

09.04.2011 01:25, Bryan Donlan wrote:
> Using dlopen will allow you to perform the fork() prior to running the
> library's initialization code.
But I don't even need that: I init it manually, there
is no automatic ctors there.

> As I said, I can't comment on the patch - I'm not familiar with that
> part of the kernel, so I don't know what kind of races may be lurking.
> But based on Oleg's comments, it seems clear to me that implementing
> your PR_DETACH is quite a complex thing to be doing.
Yes, that's true, but treat that as my personal tour to the
kernel internals. I wasn't realizing the complexity initially,
and now its almost done, so I wonder what the result will
look like, it will it worth all the troubles.

>   It is true that
> being able to daemonize() without losing threads would be a nice thing
> to have; I just have my doubts that it's worth the potential bugs that
> such a change might introduce, when it's only needed in a somewhat
> rare case, and when perfectly good workarounds exist in userspace.
Yes, I share that concerns too. And it is very unlikely that
I will propose that patch for inclusion, but I think it is possible
to code that up small and simple, in which case maybe even
Oleg will not hate it all that much. ;))
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