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Date: Mon, 23 Apr 2007 20:58:10 +0400 From: Oleg Nesterov <oleg@...sign.ru> To: Christoph Hellwig <hch@...radead.org>, "Eric W. Biederman" <ebiederm@...ssion.com>, 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, Christoph Hellwig wrote: > > On Sun, Apr 22, 2007 at 09:12:55PM -0600, Eric W. Biederman wrote: > > > > This patch implements the kthread helper functions kthread_start > > and kthread_end which make it simple to support a kernel thread > > that may decided to exit on it's own before we request it to. > > It is still assumed that eventually we will get around to requesting > > that the kernel thread stop. > > I don't think having to parallel APIs is a good idea, people will > get utterly confused which one to use. Better always grab a reference > in kthread_create and drop it in kthread_stop. For normal thread > no change in behaviour and only slightly more code in the slowpath. > > Of course it will need an audit for half-assed kthread conversion > first to avoid task_struct reference count leaks. In that case it is better to grab a reference in kthread(). This also close the race when a new thread is woken (freezer) and exits before kthread_create() does get_task_struct(). > In addition to that kthrad_end implementation look wrong. When > the kthread has exited prematurely no one will call complete > on kthread_stop_info.done before it's been setup. This is not true anymore, see another patch from Eric kthread-enhance-kthread_stop-to-abort-interruptible-sleeps.patch Oleg. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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