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

[Nitin Gupta]

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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