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

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Date:	Fri, 6 Apr 2007 12:42:50 +0400
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Robin Holt <holt@....com>
Cc:	Chris Snook <csnook@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: init's children list is long and slows reaping children.

Robin Holt wrote:
>
> wait_task_zombie() is taking many seconds to get through the list.
> For the case of a modprobe, stop_machine creates one thread per cpu
> (remember big number). All are parented to init and their exit will
> cause wait_task_zombie to scan multiple times most of the way through
> this very long list looking for threads which need to be reaped.

Could you try this patch

	http://marc.info/?l=linux-kernel&m=117337194209912

?

It can't solve the whole problem, but at least an exiting kernel thread
won't kick init.

Oleg.

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