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

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Message-ID: <Pine.LNX.4.64.0704091944580.6730@woody.linux-foundation.org>
Date:	Mon, 9 Apr 2007 19:46:28 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Dave Jones <davej@...hat.com>, Jeff Garzik <jeff@...zik.org>,
	Robin Holt <holt@....com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Jack Steiner <steiner@...ricas.sgi.com>
Subject: Re: init's children list is long and slows reaping children.



On Mon, 9 Apr 2007, Andrew Morton wrote:
> 
> >    10 ?        S<     0:00 [khelper]
> 
> That one's needed to parent the call_usermodehelper() apps.  I don't think
> it does anything else.  We used to use keventd for this but that had some
> problem whcih I forget.

I think it was one of a long series of deadlocks. 

Using a "keventd" for many different things sounds clever and nice, but 
then sucks horribly when one event triggers another event, and they depend 
on each other. Solution: use independent threads for the events.

		Linus
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