linux-kernel - Re: [PATCH 3/3] nfs: use ->mmap_prepare() to avoid an AB-BA deadlock

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Message-Id: <1195080828.7584.96.camel@heimdal.trondhjem.org>
Date:	Wed, 14 Nov 2007 17:53:48 -0500
From:	Trond Myklebust <trond.myklebust@....uio.no>
To:	Nick Piggin <npiggin@...e.de>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-arch@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hugh@...itas.com>
Subject: Re: [PATCH 3/3] nfs: use ->mmap_prepare() to avoid an AB-BA
	deadlock


On Wed, 2007-11-14 at 23:24 +0100, Nick Piggin wrote:

> mmap()s can be different from read in that the syscall may have little
> relation to when the data gets used. But I guess it's still a best
> effort thing. Fair enough.

Agreed that mmap() is special and very problematic on NFS. However I
can't see how we can improve on the existing models short of some
significant protocol modifications, and so far, nobody has presented the
IETF with a good case for why they need this level of cache consistency.

Cheers
   Trond

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