linux-kernel - Re: [PATCH] ia64 sn xpc: Convert to use kthread API.

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Message-ID: <m1mz11ijwv.fsf@ebiederm.dsl.xmission.com>
Date:	Sat, 21 Apr 2007 13:53:20 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Robin Holt <holt@....com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Dean Nelson <dcn@...ricas.sgi.com>,
	Jes Sorensen <jes@...ricas.sgi.com>, containers@...ts.osdl.org,
	Oleg Nesterov <oleg@...sign.ru>,
	Christoph Hellwig <hch@...radead.org>,
	linux-kernel@...r.kernel.org, Tony Luck <tony.luck@...el.com>,
	rja@....com
Subject: Re: [PATCH] ia64 sn xpc: Convert to use kthread API.

Robin Holt <holt@....com> writes:

> I think this was originally coded with daemonize to avoid issues with
> reaping children.  Dean Nelson can correct me if I am wrong.  I assume
> this patch is going in as part of the set which will make these threads
> clear themselves from the children list and if that is the case, I can
> see no issues.

One of my earlier patches guarantees that kthreadd will have pid == 2.

daemonize actually explicitly reparents to init so using daemonize and
kernel_thread provides no help at all with respect to scaling.  It in
fact guarantees you will be on init's list of child processes.

The work to enhance wait is a little tricky and it conflicts with the
utrace patches, which makes it hard to pursue at the moment.

I'm actually sorting out kthread stop so I can complete the pid namespace.
But since all kthreads are children of kthreadd this helps in a small
way with the scaling issue.

Eric
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