linux-kernel - Re: [Ksummit-2008-discuss] Delayed interrupt work, thread pools

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Message-Id: <1215032573.21182.59.camel@pasglop>
Date:	Thu, 03 Jul 2008 07:02:53 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	James Bottomley <James.Bottomley@...senPartnership.com>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	ksummit-2008-discuss@...ts.linux-foundation.org,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	Jeremy Kerr <jk@...abs.org>
Subject: Re: [Ksummit-2008-discuss] Delayed interrupt work, thread pools

On Wed, 2008-07-02 at 16:00 -0400, Steven Rostedt wrote:
> 
> As for interrupt threads, those would help for some non-RT issues
> (having a better desktop feel) but not for the issue that Ben has been
> stating. I would be interested in knowing exactly what is needing to
> handle a page fault inside the kernel.  If we need to do something for a
> user space task, as soon as that task is found the work should be passed
> to that thread.

Not much is needed, as the mm is passed as an argument to
handle_mm_fault(). Page faults can already be handled by 'other'
processes (get_user_pages() doesn't have to be called in the context of
the target mm). I need to check if we may not get into funky issues down
at the vfs level if using a kernel thread without files and I may need
to dbl check if anything in that path tries to signal but that's about
it afaik.

Ben.


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