linux-kernel - Re: [PATCH] ramzswap: Remove backing swap support

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Message-ID: <4BEC1793.1010109@cs.helsinki.fi>
Date:	Thu, 13 May 2010 18:15:31 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Nitin Gupta <ngupta@...are.org>
CC:	Greg KH <greg@...ah.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Cyp <cyp561@...il.com>, Minchan Kim <minchan.kim@...il.com>,
	driverdev <devel@...verdev.osuosl.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ramzswap: Remove backing swap support

Nitin Gupta wrote:
> Currently, each ramzswap device can be assigned
> a separate 'backing swap' file/partition. The ramzswap
> driver forwards swap I/O requests to this backing swap
> whenever an incompressible page is found.
> 
> This feature adds nearly 700 lines of code and it
> also duplicates much of the swapon() functionality
> (for example, finding swap extents and so on). Removing
> this code makes the driver much simpler and should
> help its transition from staging to stable drivers
> area (drivers/block/).
> 
> Similar functionality may be implemented if we can
> implement migrating pages across swap devices but the
> details have not yet been worked out.
> 
> Support for _partitions_ as backing swap could be
> retained as it requires a few lines of code only.
> This part can be re-introduced later if above swap
> migration method turns out to be infeasible.
> 
> More cleanups and code comments will be added soon.
> 
> Signed-off-by: Nitin Gupta <ngupta@...are.org>

Acked-by: Pekka Enberg <penberg@...helsinki.fi>
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