Date: Tue, 15 Jun 2004 13:05:25 -0500
From: Dean Nelson <dcn@sgi.com>
To: Arjan van de Ven <arjanv@redhat.com>
Cc: linux-kernel@vger.kernel.org, rusty@rustcorp.com.au, dcn@sgi.com
Subject: Re: calling kthread_create() from interrupt thread
Message-ID: <20040615180525.GA17145@sgi.com>
References: <40CF350B.mailxD2X1NPFBC@aqua.americas.sgi.com> <1087321777.2710.43.camel@laptop.fenrus.com>
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On Tue, Jun 15, 2004 at 07:49:37PM +0200, Arjan van de Ven wrote:
> On Tue, 2004-06-15 at 19:42, Dean Nelson wrote:
> > I'm working on a driver that needs to create threads that can sleep/block
> > for an indefinite period of time.
> > 
> >     . Can kthread_create() be called from an interrupt handler?
> 
> no
> 
> > 
> >     . Is the cost of a kthread's creation/demise low enough so that one
> >       can, as often as needed, create a kthread that performs a simple
> >       function and exits?  Or is the cost too high for this?
> 
> for that we have keventd in 2.4, work queues in 2.6

As mentioned above, it is possible for this "simple" function to sleep/block
for an indefinite period of time. I was under the impression that one
couldn't block a work queue thread for an indefinite period of time. Am
I mistaken?

Thanks,
Dean


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