linux-kernel - Re: init's children list is long and slows reaping children.

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Message-ID: <m1k5wp5l64.fsf@ebiederm.dsl.xmission.com>
Date:	Fri, 06 Apr 2007 13:59:15 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Robin Holt <holt@....com>, Chris Snook <csnook@...hat.com>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org
Subject: Re: init's children list is long and slows reaping children.

Oleg Nesterov <oleg@...sign.ru> writes:

> On 04/06, Oleg Nesterov wrote:
>>
>> --- t/kernel/exit.c~	2007-04-06 23:31:31.000000000 +0400
>> +++ t/kernel/exit.c	2007-04-06 23:31:57.000000000 +0400
>> @@ -275,10 +275,7 @@ static void reparent_to_init(void)
>>  	remove_parent(current);
>>  	current->parent = child_reaper(current);
>>  	current->real_parent = child_reaper(current);
>
> Just noticed. Eric, is it ok we are using child_reaper() here?
> This is for kernel threads only, shouldn't we always use
> init_pid_ns.child_reaper ? (yes, it is the same currently).

Yes.  It is a bug, and the description reparent_to_init is likewise
buggy.

I have recently realized that a number of the inital pid namespace
patches have stupid little bugs in them like this.  I am upset with
myself for failing to code review them closely before the went in.
Live and learn I guess.

So when I saw this I added this to my growing list of things I needed
to review before I could assume they were done correctly.

Feel free to fix it.  I'm still a couple days out from having enough
time before I can start working on pid related issues.

Eric
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