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

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Message-ID: <20070410134814.GA28016@elte.hu>
Date:	Tue, 10 Apr 2007 15:48:14 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Oleg Nesterov <oleg@...sign.ru>, Robin Holt <holt@....com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Chris Snook <csnook@...hat.com>, linux-kernel@...r.kernel.org,
	Jack Steiner <steiner@...ricas.sgi.com>
Subject: Re: init's children list is long and slows reaping children.


* Eric W. Biederman <ebiederm@...ssion.com> wrote:

> Ingo Molnar <mingo@...e.hu> writes:
> 
> > no. Two _completely separate_ lists.
> >
> > i.e. a to-be-reaped task will still be on the main list _too_. The 
> > main list is for all the PID semantics rules. The reap-list is just 
> > for wait4() processing. The two would be completely separate.
> 
> And what pray tell except for heuristics is the list of children used 
> for?

on a second thought: the p->children list is needed for the whole 
child/parent task tree, which is needed for sys_getppid(). The question 
is, does anything require us to reparent to within the same thread 
group?

	Ingo
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