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Date: Sat, 10 Oct 2009 23:10:24 +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 On Sat 2009-10-10 14:23:41, Peter Zijlstra wrote: > On Sat, 2009-10-10 at 14:06 +0200, Pavel Machek wrote: > > 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? > > Nope, as soon as the nbd-client looses its connection you're up shit > creek. Oops, right. Putting reconnect logic into the kernel would make sense. I misunderstood your proposal. I thought you'd want to put nbd-_server_ into the kernel too. I guess we violently agree that that's unneccessary. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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