From: Pavel Machek <pavel@ucw.cz>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Christoph Hellwig <hch@infradead.org>,
Suresh Jayaraman <sjayaraman@suse.de>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
netdev@vger.kernel.org, Neil Brown <neilb@suse.de>,
Miklos Szeredi <mszeredi@suse.cz>, Wouter Verhelst <w@uter.be>,
trond.myklebust@fys.uio.no
Subject: Re: [PATCH 00/31] Swap over NFS -v20
Date: Sat, 10 Oct 2009 14:06:14 +0200 [thread overview]
Message-ID: <20091010120614.GC1811@ucw.cz> (raw)
In-Reply-To: <1254692482.21044.15.camel@laptop>
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
--
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next prev parent reply other threads:[~2009-10-10 12:06 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-01 14:04 [PATCH 00/31] Swap over NFS -v20 Suresh Jayaraman
2009-10-01 17:42 ` Christoph Hellwig
2009-10-02 5:52 ` Neil Brown
2009-10-02 8:21 ` Suresh Jayaraman
2009-10-04 21:41 ` Peter Zijlstra
2009-10-10 12:06 ` Pavel Machek [this message]
2009-10-10 12:23 ` Peter Zijlstra
2009-10-10 21:10 ` Pavel Machek
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