Re: [kerneloops] regression in 2.6.27 wrt "lock_page" and the"hwclock" program

[Arjan van de Ven]

On Sun, 12 Oct 2008 13:16:12 -0700 (PDT)
Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> 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
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