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From: Pavel Machek <>
To: Paul Clements <>
Cc: Andrew Morton <>,,,
	Laurent Vivier <>
Subject: Re: [PATCH 1/1] NBD: allow nbd to be used locally
Date: Tue, 11 Mar 2008 11:09:04 +0100	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On Mon 2008-03-10 13:26:34, Paul Clements wrote:
> Pavel Machek wrote:
>>> This patch allows a Network Block Device to be mounted locally 
>>> (nbd-client to nbd-server over
>>> It creates a kthread to avoid the deadlock described in NBD tools 
>>> documentation. So, if nbd-client hangs waiting for pages, the kblockd 
>>> thread can continue its work and free pages.
>> What happens if your new kthread blocks on memory allocation?
> Well, we expect that. The reason for the new thread is so that it hangs, 
> rather than kblockd hanging (which on a UP system brings all I/O to a 
> halt). As long as kblockd can continue making progress, we eventually free 
> up memory and then NBD can finish its requests, too.

...unless all the memory is in dirty buffers for nbd, and nbd server
is swapped out or something?
(cesky, pictures)

  reply	other threads:[~2008-03-11 13:10 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-03-09 22:47 Paul Clements
2008-03-10 10:29 ` Pavel Machek
2008-03-10 17:26   ` Paul Clements
2008-03-11 10:09     ` Pavel Machek [this message]
2008-03-24 20:37       ` [Nbd] " Wouter Verhelst
2008-03-24 21:58         ` Pavel Machek

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