[linux-mm-cc] compcache with swap free notify support

[Nitin Gupta]

Hi All,

Attached is the patch for much refined version of compcache (for
kernel 2.6.26-rc6). This version saves lot more memory than previous
versions since it now know when a swap page is no longer in use. So,
unlike previous versions, it will not store junk data which system no
longer requires. Detailed changelog is given below.

Changelog: this patch vs compcache 0.3:
 - we get callback when a swap page is no longer used
 - all locks in allocator changed to spinlock (earlier mutex)
 - lot of cleanups: no compile warnings on x86 and x86_64


Now, to use compcache, you need to:
 - Apply this patch to 2.6.26-rc6
 - In kernel config, enable (as module or in-built): Device Drivers
--> Block Devices --> Compressed RAM based swap device (also enable
two sub-options: debugging and stats)
 - Then in new kernel load compcache module and enable "ramzswap"
device (modprobe compcache; swapon /dev/ramzswap0 -p 100).


Performance numbers (in term of memory saving and performance gain)
should be much better with this patch than compcache-0.3.

This patch is also available in
SVN/trunk/sub-projects/mainline/patch_compcache_with_notify_support_2.6.26-rc6.diff

Cheers,
Nitin
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