linux-kernel - Re: [PATCH 1/3]: compressed RAM block device

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Message-ID: <49C3F41E.60500@vflare.org>
Date:	Sat, 21 Mar 2009 01:23:02 +0530
From:	Nitin Gupta <ngupta@...are.org>
To:	Pavel Machek <pavel@....cz>
CC:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3]: compressed RAM block device

Pavel Machek wrote:
> On Tue 2009-03-17 17:06:46, Nitin Gupta wrote:
>>  drivers/block/Kconfig     |   22 +
>>  drivers/block/Makefile    |    1 +
>>  drivers/block/compcache.c |  995 +++++++++++++++++++++++++++++++++++++++++++++
>>  drivers/block/compcache.h |  160 ++++++++
>>  4 files changed, 1178 insertions(+), 0 deletions(-)
>>
>> Creates RAM based block device (ramzswap0) which can be used as swap device.
>> Pages swapped to this are compressed and stored in memory itself.
>>
>> The module is called compcache.ko. It depends on:
>>  - xvmalloc.ko: memory allocator
>>  - lzo_compress.ko
>>  - lzo_decompress.ko
>>
>> See Documentation/blockdev/compcache.txt for usage details.
>>
>> Project home: http://code.google.com/p/compcache/
> 
> 
> Compcache is really bad name for this. zramdisk? gzrd?
> 
It was named compcache according to its original goal:
compressed caching for anonymous _and_ filesystem caches. This ram block
device is for handling anonymous memory only. Anyway, actual block device
is called ramzswap which you might like more :)

> Is the block device useful for general filesystem storage?
> 
No. It can only handle page aligned I/O. But it shouldn't be too hard
to make it generic compressed ram disk with physical backing device support.
But unfortunately I do not have bandwidth to do this myself.

Thanks,
Nitin

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