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Date: Sat, 10 Oct 2009 14:06:14 +0200
From: Pavel Machek <pavel@....cz>
To: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Christoph Hellwig <hch@...radead.org>,
Suresh Jayaraman <sjayaraman@...e.de>,
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, Neil Brown <neilb@...e.de>,
Miklos Szeredi <mszeredi@...e.cz>, Wouter Verhelst <w@...r.be>,
trond.myklebust@....uio.no
Subject: Re: [PATCH 00/31] Swap over NFS -v20
Hi!
> > One of them
> > would be the whole VM/net work to just make swap over nbd/iscsi safe.
>
> Getting those two 'fixed' is going to be tons of interesting work
> because they involve interaction with userspace daemons.
>
> NBD has fairly simple userspace, but iSCSI has a rather large userspace
> footprint and a rather complicated user/kernel interaction which will be
> mighty interesting to get allocation safe.
>
> Ideally the swap-over-$foo bits have no userspace component.
>
> That said, Wouter is the NBD userspace maintainer and has expressed
> interest into looking at making that work, but its sure going to be
> non-trivial, esp. since exposing PF_MEMALLOC to userspace is a, not over
> my dead-bodym like thing.
Well, as long as nbd-server is on separate machine (with real swap),
safe swapping over network should be ok, without PF_MEMALLOC for
userspace or similar nightmares, right?
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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