linux-kernel - Re: [PATCH] kthread: Spontaneous exit support

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Message-ID: <20070423182014.GA243@tv-sign.ru>
Date:	Mon, 23 Apr 2007 22:20:14 +0400
From:	Oleg Nesterov <oleg@...sign.ru>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	containers@...ts.osdl.org, linux-kernel@...r.kernel.org,
	Marcel Holtmann <marcel@...tmann.org>, rusty@...tcorp.com.au
Subject: Re: [PATCH] kthread: Spontaneous exit support

On 04/23, Eric W. Biederman wrote:
>
> So I propose we add a kthread_orphan as a basic primitive to decrement the
> count on the task_struct if we want a kthread to simply exit after it
> has done some work.
> 
> And as a helper function we can have a kthread_run_orphan.

Speaking about helpers, could we also add kthread_start(), which should be
used instead of direct wake_up_process() ? Not that it is terribly important,
but still.

Note that "kthread_create() pins the task_struct" allows us to cleanup the code.
Look at this ugly "wait_to_die:" label in migration_thread(). Is is because
migration_thread() can't exit until CPU_DEAD reaps it. Other reasons were already
solved by kthread-enhance-kthread_stop-to-abort-interruptible-sleeps.patch

Oleg.

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