Re: [PATCH 0/3] compressed in-memory swapping take3

Nitin Gupta
2009-03-25T10:42:21Z

Hi,

Maybe it simply got lost in LKML traffic.
Any chance it can make it into 2.6.30??

Thanks,
Nitin

Nitin Gupta wrote:
>
> Project home: http://code.google.com/p/compcache/
>
> It allows creating a RAM based block device which acts as swap disk.
> Pages swapped to this device are compressed and stored in memory itself.
> This is a big win over swapping to slow hard-disk which are typically used
> as swap disk. For flash, these suffer from wear-leveling issues when used
> as swap disk - so again its helpful. For swapless systems, it allows more
> apps to run.
>
>
> * Changelog: take3 vs take2
> xvmalloc changes:
> - Use kernel defined macros and constants in xvmalloc and remove
> equivalent defines for ALIGN, roundup etc.
> - Use kernel bitops (set_bit, clear_bit)
> - Moved it to drivers/block since its not clear if it has any other
> user.
> ramzswap changes:
> - All instances of compcache renamed to ramzswap.
> Also renamed module to ramzswap
> - Renamed "backing_dev" parameter to "backing_swap"
> - Documentation changes to reflect above changes.
> - Remove "table index" from object header (4 bytes). This will be
> needed when memory defragmentation is implemented. So, avoid this
> (small) overhead for now.
>
>
> * Changelog: take2 vs initial revision:
> xvmalloc changes:
> - Use Linux kernel coding style for xvmalloc
> - Collapse all individual flag test/set/get to generic {test_set_get}_flag
> - Added BLOCK_NEXT() macro to reach next contiguous block
> - Other minor cleanups - no functional changes
> compcache block device code:
> - compcache core changes due to change in xvmalloc interface names
>
>
> Links to performance numbers, use cases can be found in original thread:
> http://lkml.org/lkml/2009/3/17/116
>
> Thanks to Christoph, Pekka and Andrew for feedback on previous revisions.
>
> Thanks,
> Nitin
>