From: Trond Myklebust <trond.myklebust@fys.uio.no>
To: Nick Piggin <npiggin@suse.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-arch@vger.kernel.org, linux-fsdevel@vger.kernel.org,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
Hugh Dickins <hugh@veritas.com>
Subject: Re: [PATCH 3/3] nfs: use ->mmap_prepare() to avoid an AB-BA deadlock
Date: Wed, 14 Nov 2007 17:53:48 -0500 [thread overview]
Message-ID: <1195080828.7584.96.camel@heimdal.trondhjem.org> (raw)
In-Reply-To: <20071114222448.GE31048@wotan.suse.de>
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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next prev parent reply other threads:[~2007-11-14 22:53 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-14 20:01 [PATCH 0/3] mmap vs NFS Peter Zijlstra
2007-11-14 20:01 ` [PATCH 1/3] mm: pull mmap_sem into do_mmap{,_pgoff} Peter Zijlstra
2007-11-14 20:01 ` [PATCH 2/3] vfs: ->mmap_prepare() Peter Zijlstra
2007-11-14 20:01 ` [PATCH 3/3] nfs: use ->mmap_prepare() to avoid an AB-BA deadlock Peter Zijlstra
2007-11-14 21:22 ` Nick Piggin
2007-11-14 21:31 ` Peter Zijlstra
2007-11-14 21:41 ` Trond Myklebust
2007-11-14 21:50 ` Peter Zijlstra
2007-11-14 22:18 ` Trond Myklebust
2007-11-14 22:24 ` Nick Piggin
2007-11-14 22:53 ` Trond Myklebust [this message]
2007-11-14 20:19 ` [PATCH 0/3] mmap vs NFS Peter Zijlstra
2007-11-14 21:27 ` Trond Myklebust
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