linux-kernel - Re: [kerneloops] regression in 2.6.27 wrt "lock

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Message-ID: <20081013105559.15ccb67f@infradead.org>
Date:	Mon, 13 Oct 2008 10:55:59 -0400
From:	Arjan van de Ven <arjan@...radead.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Karel Zak <kzak@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [kerneloops] regression in 2.6.27 wrt "lock_page" and the
 "hwclock" program

On Sun, 12 Oct 2008 13:16:12 -0700 (PDT)
Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> 
> 
> On Sun, 12 Oct 2008, Karel Zak wrote:
> >
> >  Any suggestion how to nicely implement "don't schedule me out"?
> 
> There's nothing you can do. If you take a page fault, you're done.
> Forget about any "can't schedule" or "don't enable interrupts". The
> kernel _has_ to handle the page fault, and that may involve IO and
> thus random pauses. No ifs, buts or maybe's about it.
> 
> This patch may or may not get rid of the warning, at least. It won't
> fix hwclock, but that's apparently unfixable from the kernel - the
> thing is just plain buggy.


it almost sounds like it's trying to do something that ... really the
kernel should be doing.

Karel: Can you describe what it WANTS to do so we can see if we can
just extend the linux kernel to do that the right way?

-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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