linux-kernel - Re: [PATCH] Patch to integrate RapidDisk and RapidCache RAM Drive / Caching modules into the kernel

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Message-ID: <20150928064936.GA22280@infradead.org>
Date:	Sun, 27 Sep 2015 23:49:36 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Petros Koutoupis <petros@...roskoutoupis.com>
Cc:	linux-kernel@...r.kernel.org,
	"devel@...iddisk.org" <devel@...iddisk.org>
Subject: Re: [PATCH] Patch to integrate RapidDisk and RapidCache RAM Drive /
 Caching modules into the kernel

On Sun, Sep 27, 2015 at 12:17:24PM -0500, Petros Koutoupis wrote:
> Attached is a patch for two modules: RapidDisk & RapidCache. RapidDisk is a
> Linux RAM drive module which allows the user to dynamically create, remove,
> and resize RAM-based block devices. RapidDisk is designed to work with both
> volatile and non-volatile memory. In the case of volatile memory, memory is
> allocated only when needed. The RapidCache module in turn utilizes a RapidDisk
> volume as a FIFO Write-Through caching node to a slower block device.

Hi Petros,

this is three things at the same time!  We already have a ramdisk
driver, a pmem drive, bcache and dm-cache, so for each of them please
explain why we'd want to duplicate them instead of adding whatever
features you need to them.  First step is to identify those features.
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