linux-kernel - Re: EMM: disable other notifiers before register and unregister

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Message-ID: <Pine.LNX.4.64.0804031321260.8331@schroedinger.engr.sgi.com>
Date:	Thu, 3 Apr 2008 13:23:12 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Andrea Arcangeli <andrea@...ranet.com>
cc:	Robin Holt <holt@....com>, Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	steiner@....com, linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Nick Piggin <npiggin@...e.de>
Subject: Re: EMM: disable other notifiers before register and unregister

On Thu, 3 Apr 2008, Christoph Lameter wrote:

> > faults). So it should be ok to take all those locks inside the
> > mmap_sem and implement a lock_vm(mm) unlock_vm(mm). I'll think more
> > about this hammer approach while I try to implement it...
> 
> Well good luck. Hopefully we will get to something that works.

Another hammer to use may be the freezer from software suspend. With that 
you can get all tasks of a process into a definite state. Then take the 
mmap_sem writably. But then there is still try_to_unmap and friends that 
can race.


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