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

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Message-ID: <20070406173249.GA2517@elte.hu>
Date:	Fri, 6 Apr 2007 19:32:49 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	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.


* Oleg Nesterov <oleg@...sign.ru> wrote:

> > Thinking about it I do agree with Linus that two lists sounds like 
> > the right solution because it ensures we always have O(1) time when 
> > waiting for a zombie.
> 
> Well. I bet this will be painful, and will uglify the code even more.
> 
> do_wait() has to iterate over 2 lists, __ptrace_unlink() should check 
> ->exit_state, etc...

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.

	Ingo
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