linux-kernel - Re: [PATCH 00/33] Swap over NFS -v14

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Date:	Wed, 31 Oct 2007 12:27:13 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Nick Piggin <nickpiggin@...oo.com.au>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	netdev@...r.kernel.org, trond.myklebust@....uio.no
Subject: Re: [PATCH 00/33] Swap over NFS -v14

On Wed, 2007-10-31 at 14:26 +1100, Nick Piggin wrote:
> On Wednesday 31 October 2007 03:04, Peter Zijlstra wrote:
> > Hi,
> >
> > Another posting of the full swap over NFS series.
> 
> Hi,
> 
> Is it really worth all the added complexity of making swap
> over NFS files work, given that you could use a network block
> device instead?

As it stands, we don't have a usable network block device IMHO.
NFS is by far the most used and usable network storage solution out
there, anybody with half a brain knows how to set it up and use it.

> Also, have you ensured that page_file_index, page_file_mapping
> and page_offset are only ever used on anonymous pages when the
> page is locked? (otherwise PageSwapCache could change)

Good point, I hope so, both ->readpage() and ->writepage() take a locked
page, I'd have to look if it remains locked throughout the NFS call
chain.

Then again, it might become obsolete with the extended swap a_ops.


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