linux-kernel - Re: [PATCH 08 of 11] anon-vma-rwsem

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Message-Id: <1210202918.1421.20.camel@pasglop>
Date:	Thu, 08 May 2008 09:28:38 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Andrea Arcangeli <andrea@...ranet.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	torvalds@...ux-foundation.org, clameter@....com, steiner@....com,
	holt@....com, npiggin@...e.de, a.p.zijlstra@...llo.nl,
	kvm-devel@...ts.sourceforge.net, kanojsarcar@...oo.com,
	rdreier@...co.com, swise@...ngridcomputing.com,
	linux-kernel@...r.kernel.org, avi@...ranet.com, linux-mm@...ck.org,
	general@...ts.openfabrics.org, hugh@...itas.com,
	rusty@...tcorp.com.au, aliguori@...ibm.com, chrisw@...hat.com,
	marcelo@...ck.org, dada1@...mosbay.com, paulmck@...ibm.com
Subject: Re: [PATCH 08 of 11] anon-vma-rwsem


On Thu, 2008-05-08 at 00:44 +0200, Andrea Arcangeli wrote:
> 
> Please note, we can't allow a thread to be in the middle of
> zap_page_range while mmu_notifier_register runs.

You said yourself that mmu_notifier_register can be as slow as you
want ... what about you use stop_machine for it ? I'm not even joking
here :-)

> vmtruncate takes 1 single lock, the i_mmap_lock of the inode. Not more
> than one lock and we've to still take the global-system-wide lock
> _before_ this single i_mmap_lock and no other lock at all.

Ben.


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