linux-kernel - Re: Distributed storage.

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Message-Id: <200708051435.04542.phillips@phunq.net>
Date:	Sun, 5 Aug 2007 14:35:04 -0700
From:	Daniel Phillips <phillips@...nq.net>
To:	Evgeniy Polyakov <johnpol@....mipt.ru>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: Distributed storage.

On Sunday 05 August 2007 08:01, Evgeniy Polyakov wrote:
> On Sun, Aug 05, 2007 at 01:06:58AM -0700, Daniel Phillips wrote:
> > > DST original code worked as device mapper plugin too, but its two
> > > additional allocations (io and clone) per block request ended up
> > > for me as a show stopper.
> >
> > Ah, sorry, I misread.  A show stopper in terms of efficiency, or in
> > terms of deadlock?
>
> At least as in terms of efficiency. Device mapper lives in happy
> world where memory does not end and allocations are fast.

Are you saying that things are different for a network block device 
because it needs to do GFP_ATOMIC allocations?  If so then that is just 
a misunderstanding.  The global page reserve Peter and I use is 
available in interrupt context just like GFP_ATOMIC.

Regards,

Daniel
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