linux-kernel - Re: [PATCH 3/3] compcache documentation

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Message-Id: <20090321032636.fdeae224.akpm@linux-foundation.org>
Date:	Sat, 21 Mar 2009 03:26:36 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	ngupta@...are.org
Cc:	Pekka Enberg <penberg@...helsinki.fi>,
	Christoph Lameter <cl@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] compcache documentation

On Fri, 20 Mar 2009 19:44:08 +0530 Nitin Gupta <ngupta@...are.org> wrote:

> ...
>
> +   backing_dev: This is block device to be used as backing store for compcache.
> +	It must be a valid swap partition. We move data to this device when we
> +	encounter incompressible page or memlimit is reached. TODO: we may also
> +	move some pages from compcache to this device in case system is really
> +	low on memory.
> +	This device is not directly visible to kernel as a swap device
> +	(/proc/swaps will only show /dev/ramzswap0 and not this device).
> +	Managing this backing device is the job of compcache module.

hrm, OK, it kinda/sorta/maybe might be a little bit like a "compressed
cache".  But if someone comes up with a real compressed cache (ie:
pagecache) then they'll want their name back.

Also, the kernel already has a widespread and well-established "backing
device" concept, in include/linux/backing-dev.h.  This new feature's
poaching of that identifier is a bit confusing.  It would be nice to do a
wholesale rename if possible.  secondary_dev?  nv_dev?

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